Trosolwg
Mae’r Athro Dirk van der Werf yn aelod o’r Adran Ffiseg ym Mhrifysgol Abertawe.
Ewch i’m gwefan Bersonol
Yr Athro Dirk van der Werf
Cadair Bersonol
Physics
503
Pumed Llawr
Adeilad Vivian
Campws Singleton
Pumed Llawr
Adeilad Vivian
Campws Singleton
Ar gael ar gyfer Goruchwyliaeth Ôl-raddedig
Dolenni Ymchwil
Meysydd Arbenigedd
- Ffiseg Positron
- Ffiseg Positroniwm
- Gwrthfater
- Gwrthhydrogen
- Cyflymiad disgyrchol Gwrthfater
Cyhoeddiadau
Uchafbwyntiau Ymchwil
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Ahmadi, M., Alves, B., Baker, C., Bertsche, W., Butler, E., Capra, A., Carruth, C., Cesar, C., Charlton, M., Cohen, S., Collister, R., Eriksson, S., Evans, A., Evetts, N., Fajans, J., Friesen, T., Fujiwara, M., Gill, D., Gutierrez, A...., & Wurtele, J. (2017). Antihydrogen accumulation for fundamental symmetry tests. Nature Communications, 8(1)
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Ahmadi, M., Alves, B., Baker, C., Bertsche, W., Butler, E., Capra, A., Carruth, C., Cesar, C., Charlton, M., Cohen, S., Collister, R., Eriksson, S., Evans, A., Evetts, N., Fajans, J., Friesen, T., Fujiwara, M., Gill, D., Gutierrez, A...., & Eriksson, S. (2017). Observation of the hyperfine spectrum of antihydrogen. Nature, 548(7665), 66-69.
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Miranda, D., Cesar, C., Sacramento, R., Ahmadi, M., Nolan, P., Pusa, P., Baquero-Ruiz, M., Carruth, C., Charman, A., Evans, L., Fajans, J., Povilus, A., So, C., Wurtele, J., Zhmoginov, A., Bertsche, W., Butler, E., Ishida, A., Capra, A...., & Thompson, R. (2016). Fundamental Tests of Physics with Antihydrogen at ALPHA. In Latin America Optics and Photonics Conference (pp. LTu3B.1
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Charlton, M., van der Werf, D., & Charlton, M. (2015). Advances in antihydrogen physics. Science Progress, 98(1), 34-62.
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Deller, A., Mortensen, T., Isaac, C., P van der Werf, D., Charlton, M., Charlton, M., van der Werf, D., & Isaac, A. (2014). Radially selective inward transport of positrons in a Penning–Malmberg trap. New Journal of Physics, 16(7), 073028
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van der Werf, D. & van der Werf, D. (2014). The GBAR experiment. International Journal of Modern Physics: Conference Series, 30, 1460263
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Jonsell, S., van der Werf, D., Charlton, M., & van der Werf, D. (2014). Metastable states in antihydrogen formation. Hyperfine Interactions, 228(1-3), 81-83.
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Charlton, M., Giles, T., Lewis, H., Werf, D., & van der Werf, D. (2013). Positron annihilation in small molecules. Journal of Physics B: Atomic, Molecular and Optical Physics, 46(19), 195001
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Charlton, M., Eriksson, S., Isaac, C., Madsen, N., Werf, D., van der Werf, D., & Isaac, A. (2013). Antihydrogen in a bottle. Physics Education, 48(2)-220.
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Friesen, T., Amole, C., Ashkezari, M., Baquero-Ruiz, M., Bertsche, W., Bowe, P., Butler, E., Capra, A., Cesar, C., Charlton, M., Deller, A., Evetts, N., Eriksson, S., Fajans, J., Fujiwara, M., Gill, D., Gutierrez, A., Hangst, J., Hardy, W...., & van der Werf, D. (2013). Electron plasmas as a diagnostic tool for hyperfine spectroscopy of antihydrogen. -133).
Holl Ymchwil
Erthyglau Cylchgronau
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Ahmadi, M., Alves, B., Baker, C., Bertsche, W., Capra, A., Cohen, S., Torkzaban, C., Cesar, C., Charlton, M., Collister, R., Eriksson, S., Evans, A., Evetts, N., Fajans, J., Friesen, T., Fujiwara, M., Granum, P., Hangst, J., Hayden, M...., & Collaboration), . (2024). Adiabatic expansion cooling of antihydrogen. Physical Review Research, 6(3)
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Baker, C., Bertsche, W., Capra, A., Cesar, C., Charlton, M., Christensen, A., Collister, R., Cridland, A., Eriksson, S., Evans, A., Evetts, N., Fajans, J., Friesen, T., Fujiwara, M., Gill, D., Grandemange, P., Granum, P., Hangst, J., Hayden, M...., & Collaboration), . (2024). Measurements of Penning-Malmberg trap patch potentials and associated performance degradation. Physical Review Research, 6(1)
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Baker, C., Bertsche, W., Capra, A., Cesar, C., Charlton, M., Christensen, A., Collister, R., Mathad, A., Eriksson, S., Evans, A., Evetts, N., Fabbri, S., Fajans, J., Friesen, T., Fujiwara, M., Gill, D., Grandemange, P., Granum, P., Hangst, J...., & Jones, J. (2023). Design and performance of a novel low energy multispecies beamline for an antihydrogen experiment. Physical Review Accelerators and Beams, 26(4)
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Yoo, K., Moon, S., Chung, M., Won, D., Park, K., Lee, B., Kim, S., Lim, E., Kim, E., Kim, B., van der Werf, D., Kuroda, N., & Pérez, P. (2022). Design study of an antiproton trap for the GBAR experiment. Journal of Instrumentation, 17(10), T10003
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Blumer, P., Charlton, M., Chung, M., Cladé, P., Comini, P., Crivelli, P., Dalkarov, O., Debu, P., Dodd, L., Douillet, A., Guellati, S., Hervieux, P., Hilico, L., Husson, A., Indelicato, P., Janka, G., Jonsell, S., Karr, J., Kim, B...., & Baker, C. (2022). Positron accumulation in the GBAR experiment. Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 1040, 167263
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Baker, C., Bertsche, W., Capra, A., Cesar, C., Charlton, M., Cridland, A., Eriksson, S., Evans, A., Evetts, N., Fabbri, S., Fajans, J., Friesen, T., Fujiwara, M., Grandemange, P., Granum, P., Hangst, J., Hayden, M., Hodgkinson, D., Isaac, A...., & Wurtele, J. (2021). Sympathetic cooling of positrons to cryogenic temperatures for antihydrogen production. Nature Communications, 12(1)
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Husson, A., Kim, B., Welker, A., Charlton, M., Choi, J., Chung, M., Cladé, P., Comini, P., Crépin, P., Crivelli, P., Dalkarov, O., Debu, P., Dodd, L., Douillet, A., Guellati-Khélifa, S., Garroum, N., Hervieux, P., Hilico, L., Indelicato, P...., & Yoo, K. (2021). A pulsed high-voltage decelerator system to deliver low-energy antiprotons. Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 1002, 165245
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Baker, C., Bertsche, W., Capra, A., Carruth, C., Cesar, C., Charlton, M., Christensen, A., Collister, R., Cridland, A., Eriksson, S., Evans, A., Evetts, N., Fajans, J., Friesen, T., Fujiwara, M., Gill, D., Grandemange, P., Granum, P., Hangst, J...., & Charlton, M. (2021). Laser cooling of antihydrogen atoms. Nature, 592(7852), 35-42.
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Baker, C., Isaac, A., Edwards, D., Evans, H., Clayton, R., van der Werf, D., & Charlton, M. (2020). Investigation of buffer gas trapping of positrons. Journal of Physics B: Atomic, Molecular and Optical Physics, 53(18), 185201
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Collaboration), ., Ahmadi, M., Alves, B., Baker, C., Bertsche, W., Capra, A., Carruth, C., Cesar, C., Charlton, M., Cohen, S., Collister, R., Eriksson, S., Evans, A., Evetts, N., Fajans, J., Friesen, T., Fujiwara, M., Gill, D., Granum, P...., & Wurtele, J. (2020). Investigation of the fine structure of antihydrogen. Nature, 578(7795), 375-380.
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Niang, S., Charlton, M., Choi, J., Chung, M., Cladé, P., Comini, P., Crivelli, P., Crépin, P., Dalkarov, O., Debu, P., Dodd, L., Douillet, A., Froehlich, P., Gafriller, J., Guellati, S., Heinrich, J., Hervieux, P., Hilico, L., Husson, A...., & Baker, C. (2020). Accumulation of Positrons from a LINAC Based Source. Acta Physica Polonica A, 137(2), 164-166.
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Ahmadi, M., Alves, B., Baker, C., Bertsche, W., Capra, A., Carruth, C., Cesar, C., Charlton, M., Cohen, S., Collister, R., Eriksson, S., Evans, A., Evetts, N., Fajans, J., Friesen, T., Fujiwara, M., Gill, D., Hangst, J., Hardy, W...., & Wurtele, J. (2018). Observation of the 1S–2P Lyman-α transition in antihydrogen. Nature, 561(7722), 211-215.
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Ahmadi, M., Alves, B., Baker, C., Bertsche, W., Capra, A., Carruth, C., Cesar, C., Charlton, M., Cohen, S., Collister, R., Eriksson, S., Evans, A., Evetts, N., Fajans, J., Friesen, T., Fujiwara, M., Gill, D., Hangst, J., Hardy, W...., & Wurtele, J. (2018). Characterization of the 1S–2S transition in antihydrogen. Nature, 557(7703), 71-75.
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Isaac, A., Baker, C., Edwards, D., Isaac, C., Telle, H., van der Werf, D., Charlton, M., & Charlton, M. (2018). Excitation of positronium: from the ground state to Rydberg levels. Journal of Physics B: Atomic, Molecular and Optical Physics, 51
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Ahmadi, M., Alves, B., Baker, C., Bertsche, W., Capra, A., Carruth, C., Cesar, C., Charlton, M., Cohen, S., Collister, R., Eriksson, S., Evans, A., Evetts, N., Fajans, J., Friesen, T., Fujiwara, M., Gill, D., Hangst, J., Hardy, W...., & Charlton, M. (2018). Enhanced Control and Reproducibility of Non-Neutral Plasmas. Physical Review Letters, 120(2)
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Ahmadi, M., Alves, B., Baker, C., Bertsche, W., Butler, E., Capra, A., Carruth, C., Cesar, C., Charlton, M., Cohen, S., Collister, R., Eriksson, S., Evans, A., Evetts, N., Fajans, J., Friesen, T., Fujiwara, M., Gill, D., Gutierrez, A...., & Wurtele, J. (2017). Antihydrogen accumulation for fundamental symmetry tests. Nature Communications, 8(1)
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Ahmadi, M., Alves, B., Baker, C., Bertsche, W., Butler, E., Capra, A., Carruth, C., Cesar, C., Charlton, M., Cohen, S., Collister, R., Eriksson, S., Evans, A., Evetts, N., Fajans, J., Friesen, T., Fujiwara, M., Gill, D., Gutierrez, A...., & Eriksson, S. (2017). Observation of the hyperfine spectrum of antihydrogen. Nature, 548(7665), 66-69.
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Capra, A., Amole, C., Ashkezari, M., Baquero-Ruiz, M., Bertsche, W., Butler, E., Cesar, C., Charlton, M., Eriksson, S., Fajans, J., Friesen, T., Fujiwara, M., Gill, D., Gutierrez, A., Hangst, J., Hardy, W., Hayden, M., Isaac, C., Jonsell, S...., & Eriksson, S. (2016). Limit on the electric charge of antihydrogen. Hyperfine Interactions, 238(1)
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Ahmadi, M., Alves, B., Baker, C., Bertsche, W., Butler, E., Capra, A., Carruth, C., Cesar, C., Charlton, M., Cohen, S., Collister, R., Eriksson, S., Evans, A., Evetts, N., Fajans, J., Friesen, T., Fujiwara, M., Gill, D., Gutierrez, A...., & Wurtele, J. (2016). Observation of the 1S–2S transition in trapped antihydrogen. Nature, 541(7638), 506-510.
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Jonsell, S., Charlton, M., Werf, D., Charlton, M., & van der Werf, D. (2016). The role of antihydrogen formation in the radial transport of antiprotons in positron plasmas. Journal of Physics B: Atomic, Molecular and Optical Physics, 49(13), 134004
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Ahmadi, M., Baquero-Ruiz, M., Bertsche, W., Butler, E., Capra, A., Carruth, C., Cesar, C., Charman, A., Evans, L., Evetts, N., Fajans, J., Friesen, T., Fujiwara, M., Gill, D., Gutierrez, A., Hangst, J., Hardy, W., Hayden, M., Ishida, A...., & Eriksson, S. (2016). An improved limit on the charge of antihydrogen from stochastic acceleration. Nature, 529(7586), 373-376.
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Charlton, M., van der Werf, D., & Charlton, M. (2015). Advances in antihydrogen physics. Science Progress, 98(1), 34-62.
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Gutierrez, A., Ashkezari, M., Baquero-Ruiz, M., Bertsche, W., Burrows, C., Butler, E., Capra, A., Cesar, C., Charlton, M., Dunlop, R., Eriksson, S., Evetts, N., Fajans, J., Friesen, T., Fujiwara, M., Gill, D., Hangst, J., Hardy, W., Hayden, M...., & Zhmoginov, A. (2015). Antiproton cloud compression in the ALPHA apparatus at CERN. Hyperfine Interactions, 235(1-3), 21-28.
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Pérez, P., Banerjee, D., Biraben, F., Brook-Roberge, D., Charlton, M., Cladé, P., Comini, P., Crivelli, P., Dalkarov, O., Debu, P., Douillet, A., Dufour, G., Dupré, P., Eriksson, S., Froelich, P., Grandemange, P., Guellati, S., Guérout, R., Heinrich, J...., & Eriksson, S. (2015). The GBAR antimatter gravity experiment. Hyperfine Interactions, 233(1-3), 21-27.
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Deller, A., Edwards, D., Mortensen, T., Isaac, C., Werf, D., Telle, H., Charlton, M., Charlton, M., van der Werf, D., & Isaac, A. (2015). Exciting positronium with a solid-state UV laser: the Doppler-broadened Lyman-αtransition. Journal of Physics B: Atomic, Molecular and Optical Physics, 48(17), 175001
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Deller, A., Mortensen, T., Isaac, C., P van der Werf, D., Charlton, M., Charlton, M., van der Werf, D., & Isaac, A. (2014). Radially selective inward transport of positrons in a Penning–Malmberg trap. New Journal of Physics, 16(7), 073028
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van der Werf, D. & van der Werf, D. (2014). The GBAR experiment. International Journal of Modern Physics: Conference Series, 30, 1460263
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Jonsell, S., van der Werf, D., Charlton, M., & van der Werf, D. (2014). Metastable states in antihydrogen formation. Hyperfine Interactions, 228(1-3), 81-83.
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Amole, C., Ashkezari, M., Baquero-Ruiz, M., Bertsche, W., Butler, E., Capra, A., Cesar, C., Charlton, M., Eriksson, S., Fajans, J., Friesen, T., Fujiwara, M., Gill, D., Gutierrez, A., Hangst, J., Hardy, W., Hayden, M., Isaac, C., Jonsell, S...., & Eriksson, S. (2014). An experimental limit on the charge of antihydrogen. Nature Communications, 5, 3955
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Indelicato, P., Chardin, G., Grandemange, P., Lunney, D., Manea, V., Badertscher, A., Crivelli, P., Curioni, A., Marchionni, A., Rossi, B., Rubbia, A., Nesvizhevsky, V., Brook-Roberge, D., Comini, P., Debu, P., Dupré, P., Liszkay, L., Mansoulié, B., Pérez, P...., & van der Werf, D. (2014). The Gbar project, or how does antimatter fall?. Hyperfine Interactions, 228(1-3), 141-150.
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Charlton, M., van der Werf, D., Madsen, N., Isaac, A., & Eriksson, S. (2014). In situelectromagnetic field diagnostics with an electron plasma in a Penning–Malmberg trap. New Journal of Physics, 16(1), 013037
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Amole, C., Andresen, G., Ashkezari, M., Baquero-Ruiz, M., Bertsche, W., Bowe, P., Butler, E., Capra, A., Carpenter, P., Cesar, C., Chapman, S., Charlton, M., Deller, A., Eriksson, S., Escallier, J., Fajans, J., Friesen, T., Fujiwara, M., Gill, D...., & Eriksson, S. (2014). The ALPHA antihydrogen trapping apparatus. Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 735, 319-340.
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Charlton, M., Giles, T., Lewis, H., Werf, D., & van der Werf, D. (2013). Positron annihilation in small molecules. Journal of Physics B: Atomic, Molecular and Optical Physics, 46(19), 195001
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Amole, C., Andresen, G., Ashkezari, M., Baquero-Ruiz, M., Bertsche, W., Burrows, C., Butler, E., Capra, A., Cesar, C., Chapman, S., Charlton, M., Deller, A., Eriksson, S., Fajans, J., Friesen, T., Fujiwara, M., Gill, D., Gutierrez, A., Hangst, J...., & Eriksson, S. (2013). Silicon vertex detector upgrade in the ALPHA experiment. Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 732, 134-136.
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Amole, C., Ashkezari, M., Baquero-Ruiz, M., Bertsche, W., Butler, E., Capra, A., Cesar, C., Chapman, S., Charlton, M., Eriksson, S., Fajans, J., Friesen, T., Fujiwara, M., Gill, D., Gutierrez, A., Hangst, J., Hardy, W., Hayden, M., Isaac, C...., & Eriksson, S. (2013). Autoresonant-spectrometric determination of the residual gas composition in the ALPHA experiment apparatus. Review of Scientific Instruments, 84(6), 065110
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Amole, C., Ashkezari, M., Baquero-Ruiz, M., Bertsche, W., Butler, E., Capra, A., Cesar, C., Charlton, M., Eriksson, S., Fajans, J., Friesen, T., Fujiwara, M., Gill, D., Gutierrez, A., Hangst, J., Hardy, W., Hayden, M., Isaac, C., Jonsell, S...., & Eriksson, S. (2013). Description and first application of a new technique to measure the gravitational mass of antihydrogen. Nature Communications, 4
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Amole, C., Ashkezari, M., Baquero-Ruiz, M., Bertsche, W., Butler, E., Capra, A., Cesar, C., Charlton, M., Deller, A., Eriksson, S., Fajans, J., Friesen, T., Fujiwara, M., Gill, D., Gutierrez, A., Hangst, J., Hardy, W., Hayden, M., Isaac, C...., & Eriksson, S. (2013). Experimental and computational study of the injection of antiprotons into a positron plasma for antihydrogen production. Physics of Plasmas, 20(4), 043510
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Charlton, M., Eriksson, S., Isaac, C., Madsen, N., Werf, D., van der Werf, D., & Isaac, A. (2013). Antihydrogen in a bottle. Physics Education, 48(2)-220.
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Mortensen, T., Deller, A., Isaac, C., van der Werf, D., Charlton, M., Machacek, J., van der Werf, D., & Isaac, A. (2013). Manipulation of the magnetron orbit of a positron cloud in a Penning trap. Physics of Plasmas, 20(1), 012124
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Butler, E., Andresen, G., Ashkezari, M., Baquero-Ruiz, M., Bertsche, W., Bowe, P., Cesar, C., Chapman, S., Charlton, M., Deller, A., Eriksson, S., Fajans, J., Friesen, T., Fujiwara, M., Gill, D., Gutierrez, A., Hangst, J., Hardy, W., Hayden, M...., & Eriksson, S. (2012). Trapped antihydrogen. Hyperfine Interactions, 212(1-3), 15-29.
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Hydomako, R., Andresen, G., Ashkezari, M., Baquero-Ruiz, M., Bertsche, W., Butler, E., Bowe, P., Cesar, C., Chapman, S., Charlton, M., Fajans, J., Friesen, T., Fujiwara, M., Gill, D., Hangst, J., Hardy, W., Hayano, R., Hayden, M., Humphries, A...., & van der Werf, D. (2012). Antihydrogen detection in ALPHA. Hyperfine Interactions, 212(1-3), 91-99.
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Werf, D., Isaac, C., Baker, C., Mortensen, T., Charlton, M., van der Werf, D., & Isaac, A. (2012). Compression of positron clouds using rotating wall electric fields. Hyperfine Interactions, 212(1-3), 125-132.
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Rizzini, E., Venturelli, L., Zurlo, N., Charlton, M., Amsler, C., Bonomi, G., Canali, C., Carraro, C., Fontana, A., Genova, P., Hayano, R., Jørgensen, L., Kellerbauer, A., Lagomarsino, V., Landua, R., Macrí, M., Manuzio, G., Montagna, P., Regenfus, C...., & van der Werf, D. (2012). Further evidence for low-energy protonium production in vacuum. The European Physical Journal Plus, 127(10)
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Werf, D., Isaac, C., Baker, C., Mortensen, T., Kerrigan, S., Charlton, M., Charlton, M., van der Werf, D., Baker, C., & Isaac, A. (2012). The behaviour of positron clouds in the single-particle regime under the influence of rotating wall electric fields. New Journal of Physics, 14(7), 075022
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Bertsche, W., Andresen, G., Ashkezari, M., Baquero-Ruiz, M., Bowe, P., Carpenter, P., Butler, E., Cesar, C., Chapman, S., Charlton, M., Eriksson, S., Fajans, J., Friesen, T., Fujiwara, M., Gill, D., Gutierrez, A., Hangst, J., Hardy, W., Hayano, R...., & Eriksson, S. (2012). Antihydrogen formation by autoresonant excitation of antiproton plasmas. Hyperfine Interactions, 212(1-3)-67.
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Ashkezari, M., Andresen, G., Baquero-Ruiz, M., Bertsche, W., Bowe, P., Butler, E., Cesar, C., Chapman, S., Charlton, M., Deller, A., Eriksson, S., Fajans, J., Friesen, T., Fujiwara, M., Gill, D., Gutierrez, A., Hangst, J., Hardy, W., Hayano, R...., & van der Werf, D. (2012). Progress towards microwave spectroscopy of trapped antihydrogen. Hyperfine Interactions, 212(1-3)-90.
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Friesen, T., Andresen, G., Ashkezari, M., Baquero-Ruiz, M., Bertsche, W., Bowe, P., Butler, E., Cesar, C., Chapman, S., Charlton, M., Eriksson, S., Fajans, J., Fujiwara, M., Gill, D., Gutierrez, A., Hangst, J., Hardy, W., Hayano, R., Hayden, M...., & Eriksson, S. (2012). Microwave-plasma interactions studied via mode diagnostics in ALPHA. Hyperfine Interactions, 212(1-3)-123.
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Amole, C., Ashkezari, M., Andresen, G., Baquero-Ruiz, M., Bertsche, W., Bowe, P., Butler, E., Cesar, C., Chapman, S., Charlton, M., Deller, A., Eriksson, S., Fajans, J., Friesen, T., Fujiwara, M., Gill, D., Gutierrez, A., Hangst, J., Hardy, W...., & Eriksson, S. (2012). Alternative method for reconstruction of antihydrogen annihilation vertices. Hyperfine Interactions, 212(1-3)-107.
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Andresen, G., Ashkezari, M., Bertsche, W., Bowe, P., Butler, E., Cesar, C., Chapman, S., Charlton, M., Deller, A., Eriksson, S., Fajans, J., Friesen, T., Fujiwara, M., Gill, D., Gutierrez, A., Hangst, J., Hardy, W., Hayden, M., Hayano, R...., & Eriksson, S. (2012). Antihydrogen annihilation reconstruction with the ALPHA silicon detector. Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 684, 73-81.
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Amole, C., Ashkezari, M., Baquero-Ruiz, M., Bertsche, W., Bowe, P., Butler, E., Capra, A., Cesar, C., Charlton, M., Deller, A., Donnan, P., Eriksson, S., Fajans, J., Friesen, T., Fujiwara, M., Gill, D., Gutierrez, A., Hangst, J., Hardy, W...., & Eriksson, S. (2012). Resonant quantum transitions in trapped antihydrogen atoms. Nature, 483(7390), 439-443.
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Amole, C., Andresen, G., Ashkezari, M., Baquero-Ruiz, M., Bertsche, W., Butler, E., Cesar, C., Chapman, S., Charlton, M., Deller, A., Eriksson, S., Fajans, J., Friesen, T., Fujiwara, M., Gill, D., Gutierrez, A., Hangst, J., Hardy, W., Hayden, M...., & Eriksson, S. (2012). Discriminating between antihydrogen and mirror-trapped antiprotons in a minimum-B trap. New Journal of Physics, 14(1)
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Andresen, G., Ashkezari, M., Baquero-Ruiz, M., Bertsche, W., Bowe, P., Butler, E., Cesar, C., Chapman, S., Charlton, M., Deller, A., Eriksson, S., Fajans, J., Friesen, T., Fujiwara, M., Gill, D., Gutierrez, A., Hangst, J., Hardy, W., Hayden, M...., & Eriksson, S. (2012). The ALPHA – detector: Module Production and Assembly. Journal of Instrumentation, 7(01), C01051-C01051.
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Charlton, M., Andresen, G., Ashkezari, M., Baquero-Ruiz, M., Bertsche, W., Bowe, P., Bray, C., Butler, E., Cesar, C., Chapman, S., Fajans, J., Friesen, T., Fujiwara, M., Gill, D., Hangst, J., Hardy, W., Hayano, R., Hayden, M., Humphries, A...., & Madsen, N. (2011). Antiparticle sources for antihydrogen production and trapping. Journal of Physics: Conference Series, 262
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Andresen, G., Ashkezari, M., Baquero-Ruiz, M., Bertsche, W., Bowe, P., Bray, C., Butler, E., Cesar, C., Chapman, S., Charlton, M., Fajans, J., Friesen, T., Fujiwara, M., Gill, D., Hangst, J., Hardy, W., Hayano, R., Hayden, M., Humphries, A...., & Madsen, N. (2011). Search for trapped antihydrogen. Physics Letters B, 695(1-4), 95-104.
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Colucci, M., Werf, D., Charlton, M., Charlton, M., & van der Werf, D. (2011). The temperature and density dependence of positron annihilation in CO2and SF6. Journal of Physics B: Atomic, Molecular and Optical Physics, 44(17)
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Andresen, G., Ashkezari, M., Baquero-Ruiz, M., Bertsche, W., Bowe, P., Butler, E., Cesar, C., Charlton, M., Deller, A., Eriksson, S., Fajans, J., Friesen, T., Fujiwara, M., Gill, D., Gutierrez, A., Hangst, J., Hardy, W., Hayano, R., Hayden, M...., & Eriksson, S. (2011). Confinement of antihydrogen for 1,000 seconds. Nature Physics, 7(7), 558-564.
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Madsen, N., Amoretti, M., Amsler, C., Bonomi, G., Bowe, P., Carraro, C., Cesar, C., Charlton, M., Doser, M., Fontana, A., Fujiwara, M., Funakoshi, R., Genova, P., Hangst, J., Hayano, R., Jørgensen, L., Kellerbauer, A., Lagomarsino, V., Landua, R...., & Madsen, N. (2005). Spatial Distribution of Cold Antihydrogen Formation. Physical Review Letters, 94(3), 4 pages
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Bonomi, G. & van der Werf, D. (2004). Temperature dependence of anti-hydrogen production in the ATHENA experiment. Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms, 214, 17-21.
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Lord, J., Cox, S., Charlton, M., Werf, D., Lichti, R., Amato, A., & van der Werf, D. (2004). The muon spin response to intermittent hyperfine interaction: modelling the high-temperature electrical activity of hydrogen in silicon. Journal of Physics: Condensed Matter, 16(40), S4739-S4760.
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Amoretti, M., Amsler, C., Bonomi, G., Bouchta, A., Bowe, P., Carraro, C., Cesar, C., Charlton, M., Doser, M., Filippini, V., Fontana, A., Fujiwara, M., Funakoshi, R., Genova, P., Hangst, J., Hayano, R., Jørgensen, L., Kellerbauer, A., Lagomarsino, V...., & van der Werf, D. (2004). Dynamics of antiproton cooling in a positron plasma during antihydrogen formation. Physics Letters B, 590(3-4), 133-142.
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Fujiwara, M., Amoretti, M., Bonomi, G., Bouchta, A., Bowe, P., Carraro, C., Cesar, C., Charlton, M., Doser, M., Filippini, V., Fontana, A., Funakoshi, R., Genova, P., Hangst, J., Hayano, R., Jørgensen, L., Lagomarsino, V., Landua, R., Lodi-Rizzini, E...., & Madsen, N. (2004). Three-Dimensional Annihilation Imaging of Trapped Antiprotons. Physical Review Letters, 92(6)
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Amoretti, M., Amsler, C., Bazzano, G., Bonomi, G., Bouchta, A., Bowe, P., Canali, C., Carraro, C., Cesar, C., Charlton, M., Doser, M., Fontana, A., Fujiwara, M., Funakoshi, R., Genova, P., Hangst, J., Hayano, R., Johnson, I., Jørgensen, L...., & Madsen, N. (2004). Antihydrogen production temperature dependence. Physics Letters B, 583(1-2), 59-67.
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Cox, S., Gidopoulos, N., Lord, J., Charlton, M., Van der Werf, D., Amato, A., Lichti, R., & van der Werf, D. (2003). The electrical activity of hydrogen and muonium in silicon at high temperatures. Physica B: Condensed Matter, 340-342, 641-645.
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Amoretti, M., Bonomi, G., Bouchta, A., Bowe, P., Carraro, C., Cesar, C., Charlton, M., Doser, M., Fontana, A., Fujiwara, M., Funakoshi, R., Genova, P., Hangst, J., Hayano, R., Jørgensen, L., Lagomarsino, V., Landua, R., Rizzini, E., Macrı́, M...., & van der Werf, D. (2003). Complete nondestructive diagnostic of nonneutral plasmas based on the detection of electrostatic modes. Physics of Plasmas, 10(8), 3056-3064.
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Regenfus, C., Amsler, C., Glauser, A., Grögler, D., Lindelöf, D., Pruys, H., & van der Werf, D. (2003). Detection of antihydrogen annihilations with a cryogenic pure-CsI crystal detector. Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 504(1-3), 343-346.
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Merrison, J., Charlton, M., Aggerholm, P., Knudsen, H., van der Werf, D., Clarke, J., Poulsen, M., & van der Werf, D. (2003). Development and applications of time-bunched and velocity-selected positron beams. Review of Scientific Instruments, 74(7), 3284-3292.
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Morton, R., Werf, D., Rice-Evans, P., & van der Werf, D. (2003). Evidence for positronium formation at incommensurate monolayers of argon on graphite. Journal of Physics: Condensed Matter, 15(50), L771-L776.
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Madsen, N., Amoretti, M., Amsler, C., Bonomi, G., Bouchta, A., Bowe, P., Carraro, C., Cesar, C., Charlton, M., Doser, M., Filippini, V., Fontana, A., Fujiwara, M., Funakoshi, R., Genova, P., Hangst, J., Hayano, R., Jørgensen, L., Lagomarsino, V...., & van der Werf, D. (2003). Positron Plasma Diagnostics and Temperature Control for Antihydrogen Production. Physical Review Letters, 91(5), 5 pages
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van der Werf, D. (2002). Positron annihilation study of the diffusion of oxygen in annealed silicon-doped gallium arsenide.SU Repository: https://cronfa.swan.ac.uk/Record/cronfa45336
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Fujiwara, M., Amoretti, M., Amsler, C., Bendiscioli, G., Bonomi, G., Bouchta, A., Bowe, P., Carraro, C., Charlton, M., Collier, M., Doser, M., Filippini, V., Fine, K., Fontana, A., Funakoshi, R., Genova, P., Grögler, D., Hangst, J., Hayano, R...., & van der Werf, D. (2001). Producing slow antihydrogen for a test of CPT symmetry with ATHENA. Hyperfine Interactions, 138(1/4), 153-158.
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Morton, R., van der Werf, D., Rice-Evans, P., & van der Werf, D. (2000). Phase transitions in monolayer hydrogen and deuterium on graphite. Physical Review B, 62(24), 17031-17034.
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van der Werf, D. (1997). Positron studies of plasma-treated silicon wafers.SU Repository: https://cronfa.swan.ac.uk/Record/cronfa45344
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van der Werf, D., van Leuken, H., de Groot, R., & van der Werf, D. (1995). Electric-field-gradient calculations on cadmium in cadmium-helium vacancy clusters in tungsten. Physical Review B, 52(6), 3909-3916.
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Abd El Keriem, M., van der Werf, D., Pleiter, F., & van der Werf, D. (1993). Helium-vacancy interaction in tungsten. Physical Review B, 47(22), 14771-14777.
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Abd El Keriem, M., van der Werf, D., Pleiter, F., & van der Werf, D. (1993). Hydrogen-vacancy interaction in W and Mo. Hyperfine Interactions, 79(1-4), 783-786.
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Keriem, M., Werf, D., Pleiter, F., & van der Werf, D. (1993). Hydrogen-vacancy interaction in molybdenum. Journal of Physics: Condensed Matter, 5(12), 1801-1810.
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Abd El Keriem, M., van der Werf, D., Pleiter, F., & van der Werf, D. (1993). Trap mutation in He-doped ion-implanted tungsten. Hyperfine Interactions, 79(1-4), 787-791.
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Heslinga, D., Weitering, H., van der Werf, D., Klapwijk, T., Hibma, T., & van der Werf, D. (1990). Atomic-structure-dependent Schottky barrier at epitaxial Pb/Si(111) interfaces. Physical Review Letters, 64(13), 1589-1592.
Llyfrau Awdurol
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van der Werf, D. (2001). A positron accumulator for antihydrogen synthesisSU Repository: https://cronfa.swan.ac.uk/Record/cronfa45340
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van der Werf, D. (1997). Defect profiling with low energy positrons of nitrogen implanted siliconSU Repository: https://cronfa.swan.ac.uk/Record/cronfa45343
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van der Werf, D. (1997). Positronium formation at a graphite surface in the presence of physisorbed kryptonSU Repository: https://cronfa.swan.ac.uk/Record/cronfa45345
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van der Werf, D. (1997). Positronium production at condensed layers of hydrogen on graphiteSU Repository: https://cronfa.swan.ac.uk/Record/cronfa45346
Penodau Llyfrau
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Genova, P., Amoretti, M., Amsler, C., Bonomi, G., Bowe, P., Canali, C., Carraro, C., Cesar, C., Charlton, M., Doser, M., Fontana, A., Fujiwara, M., Funakoshi, R., Hangst, J., Hayano, R., Jørgensen, L., Kellerbauer, A., Lagomarsino, V., Landua, R...., & van der Werf, D. (2006). PRODUCTION AND STUDY OF ANTIHYDROGEN IN THE ATHENA EXPERIMENT. Nuclear Science and Safety in Europe -48).
Cyfraniadau Cynadleddau
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Miranda, D., Cesar, C., Sacramento, R., Ahmadi, M., Nolan, P., Pusa, P., Baquero-Ruiz, M., Carruth, C., Charman, A., Evans, L., Fajans, J., Povilus, A., So, C., Wurtele, J., Zhmoginov, A., Bertsche, W., Butler, E., Ishida, A., Capra, A...., & Thompson, R. (2016). Fundamental Tests of Physics with Antihydrogen at ALPHA. In Latin America Optics and Photonics Conference (pp. LTu3B.1
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Banerjee, D., Biraben, F., Charlton, M., Clade, P., Comini, P., Crivelli, P., Dalkarov, O., Debu, P., Dodd, L., Douillet, A., Dufour, G., Dupre, P., Eriksson, S., Froelich, P., Grandemange, P., Guellati, S., Guerout, R., Heinrich, J., Hervieux, P...., & Eriksson, S. (2016). Towards a test of the weak equivalence principle of gravity using anti-hydrogen at CERN. (pp. 1-2). 2016 Conference on Precision Electromagnetic Measurements (CPEM 2016).
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Friesen, T., Amole, C., Ashkezari, M., Baquero-Ruiz, M., Bertsche, W., Bowe, P., Butler, E., Capra, A., Cesar, C., Charlton, M., Deller, A., Evetts, N., Eriksson, S., Fajans, J., Fujiwara, M., Gill, D., Gutierrez, A., Hangst, J., Hardy, W...., & van der Werf, D. (2013). Electron plasmas as a diagnostic tool for hyperfine spectroscopy of antihydrogen. -133).
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Silveira, D., Andresen, G., Ashkezari, M., Baquero-Ruiz, M., Bertsche, W., Bowe, P., Butler, E., Cesar, C., Chapman, S., Charlton, M., Fajans, J., Friesen, T., Fujiwara, M., Gill, D., Hangst, J., Hardy, W., Hayden, M., Hydomako, R., Jonsell, S...., & Madsen, N. (2013). Evaporative cooling of antiprotons for the production of trappable antihydrogen. In AIP Conference Proceedings (pp. 165-174).
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Friesen, T., Amole, C., Ashkezari, M., Baquero-Ruiz, M., Bertsche, W., Bowe, P., Butler, E., Capra, A., Cesar, C., Charlton, M., Deller, A., Evetts, N., Eriksson, S., Fajans, J., Fujiwara, M., Gill, D., Gutierrez, A., Hangst, J., Hardy, W...., & Eriksson, S. (2013). Electron plasmas as a diagnostic tool for hyperfine spectroscopy of antihydrogen. In AIP Conference Proceedings (pp. 123-133).
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Charlton, M., Andresen, G., Ashkezari, M., Baquero-Ruiz, M., Bertsche, W., Bowe, P., Butler, E., Carpenter, P., Cesar, C., Chapman, S., Eriksson, S., Fajans, J., Friesen, T., Fujiwara, M., Gill, D., Gutierrez, A., Hangst, J., Hardy, W., Hayano, R...., & Eriksson, S. (2012). Antiparticle plasmas for antihydrogen trapping. (pp. 7-16).
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FUJIWARA, M., ANDRESEN, G., ASHKEZARI, M., BAQUERO-RUIZ, M., BERTSCHE, W., BRAY, C., BUTLER, E., CESAR, C., CHAPMAN, S., CHARLTON, M., CESAR, C., FAJANS, J., FRIESEN, T., GILL, D., HANGST, J., HARDY, W., HAYANO, R., HAYDEN, M., HUMPHRIES, A...., & Madsen, N. (2011). ALPHA ANTIHYDROGEN EXPERIMENT. In CPT AND Lorentz Symmetry. (pp. 50-54). World Scientific Publishing Co..
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Charlton, M., Werf, D., & van der Werf, D. (2010). Antihydrogen Physics. In Proceedings of the International School of Physics "Enrico Fermi" Course CLXXIV "Physics with Many Positrons" (pp. 189-215). IOS.
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van der Werf, D. (2010). Antimatter plasmas used for antihydrogen formation.SU Repository: https://cronfa.swan.ac.uk/Record/cronfa45309
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Fujiwara, M., Andresen, G., Bertsche, W., Bowe, P., Bray, C., Butler, E., Cesar, C., Chapman, S., Charlton, M., Fajans, J., Funakoshi, R., Gill, D., Hangst, J., Hardy, W., Hayano, R., Hayden, M., Humphries, A., Hydomako, R., Jenkins, M...., & Madsen, N. (2008). Particle Physics Aspects of Antihydrogen Studies with ALPHA at CERN. -220).
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Andresen, G., Bertsche, W., Bowe, P., Bray, C., Butler, E., Cesar, C., Chapman, S., Charlton, M., Fajans, J., Fujiwara, M., Funakoshi, R., Gill, D., Hangst, J., Hardy, W., Hayano, R., Hayden, M., Humphries, A., Hydomako, R., Jenkins, M...., & Madsen, N. (2008). First Attempts at Antihydrogen Trapping in ALPHA. -248).
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Andresen, G., Bertsche, W., Bowe, P., Bray, C., Butler, E., Cesar, C., Chapman, S., Charlton, M., Fajans, J., Fujiwara, M., Funakoshi, R., Gill, D., Hangst, J., Hardy, W., Hayano, R., Hayden, M., Humphries, A., Hydomako, R., Jenkins, M...., & Madsen, N. (2008). Antiproton compression and radial measurements. -105).
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MADSEN, N., ANDRESEN, G., BERTSCHE, W., BOSTON, A., BOWE, P., BUTLER, E., CESAR, C., CHAPMAN, S., CHARLTON, M., CHARTIER, M., FAJANS, J., FUNAKOSHI, R., GILL, D., HANGST, J., HARDY, W., HAYANO, R., HAYDEN, M., HYDOMAKO, R., JENKINS, M...., & Madsen, N. (2008). THE ALPHA ANTIHYDROGEN EXPERIMENT. (pp. 143-149).
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Fajans, J., Bertsche, W., Burke, K., Deutsch, A., Chapman, S., Gomberroff, K., werf, D., Wurtele, J., & van der Werf, D. (2006). Simple loss scaling laws for quadrupoles and higher-order multipoles used in antihydrogen traps.SU Repository: https://cronfa.swan.ac.uk/Record/cronfa15977
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Cesar, C. & van der Werf, D. (2005). Cold antihydrogen at ATHENA: Experimental observation and beyond.
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Cox, S. & van der Werf, D. (2005). Hydrogen in oxides, modelled by muonium.
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Rotondi, A. & van der Werf, D. (2005). Results from ATHENA.
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Bertsche, W. & van der Werf, D. (2005). The ALPHA experiment: A cold antihydrogen trap.
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van der Werf, D. (2003). Cold antihydrogen at ATHENA: Experimental observation and beyond.SU Repository: https://cronfa.swan.ac.uk/Record/cronfa45329
Goruchwyliaeth
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Systematic studies of positron accumulation and transfer. (dyfarnwyd 2024)
MScGoruchwyliwr arall: Prof Niels Madsen
Modiwlau a Addysgir
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PH-022 Electricity and Magnetism
Introduction to basic concepts in electricity and magnetism, including electrostatics, magnetostatics, electromagnetic induction, and electrical circuits.
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PH-210 Laboratory Physics 2 and Group Projects
The objective of this module is for students to carry out a range of physical measurements and to collate data in a structured manner. Students will be familiarised with various software packages for the collation, analysis and representation of data. They will be expected to keep neat and comprehensive laboratory notebooks, and to write lucid reports of their experiments. The students will also get experience of working within a team (or group) environment on a five-week project.
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PH-210C Ffiseg Labordy 2 a Phrosiectau Grwp
Amcan y modiwl hwn yw i fyfyrwyr i wneud amrywiaeth o fesuriadau ffisegol ac i gasglu'r data mewn modd strwythuredig. Bydd myfyrwyr yn dod i arfer â gwahanol becynnau o feddalwedd ar gyfer coladu, dadansoddi a chynrychioli data. Bydd disgwyl iddynt gadw llyfrau labordy taclus a cynhwysfawr, ac i ysgrifennu adroddiadau eglur o'u harbrofion. Bydd y myfyrwyr hefyd yn cael profiad o weithio mewn amgylchedd tîm (neu gr¿p) ar brosiect pum wythnos.
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PH-211C Ffiseg Labordy 2
Amcan y modiwl hwn yw i fyfyrwyr i wneud amrywiaeth o fesuriadau ffisegol ac i gasglu'r data mewn modd strwythuredig. Bydd myfyrwyr yn dod i arfer â gwahanol becynnau o feddalwedd ar gyfer coladu, dadansoddi a chynrychioli data. Bydd disgwyl iddynt gadw llyfrau labordy taclus a cynhwysfawr, ac i ysgrifennu adroddiadau eglur o'u harbrofion. Bydd y myfyrwyr hefyd yn cael profiad o weithio mewn amgylchedd tîm (neu gr¿p) ar brosiect pum wythnos.
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PH-339 Climate Physics
This module covers the Physics of Climate Change including issues related to energy generation.