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Theory and design of a new submillimeter magnetically guided positron beam at the University of Hong KongKwan, Pui-ying, Rebecca., 關珮瑩. January 2002 (has links)
published_or_final_version / Physics / Master / Master of Philosophy
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A novel design of a variable energy positron lifetime beamChen, Dan, January 2007 (has links)
Thesis (M. Phil.)--University of Hong Kong, 2008. / Also available in print.
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A novel design of a variable energy positron lifetime beamChen, Dan, 陳丹 January 2007 (has links)
published_or_final_version / abstract / Physics / Master / Master of Philosophy
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The focusing of the HKU positron beam, and an extended design for incorporating secondary electron-positron annihilation lifetimespectroscopyKwan, Pui-ying, Rebecca., 關珮瑩. January 2006 (has links)
published_or_final_version / abstract / Physics / Doctoral / Doctor of Philosophy
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Etude de la faisabilité d'une source de positrons polarisée basée sur le bremsstrahlung d'un faisceau d'électrons polarisé / Feasibility studies of a polarized positron source based on the bremsstrahlung of polarized electronsDumas, Jonathan 22 September 2011 (has links)
Les communautés de la physique nucléaire et des hautes énergies ont montré un intérêt croissant pour les faisceaux de positrons intenses et hautement polarisés. Des photons polarisés durs peuvent produire des positrons dans le champ atomique par création de paire, l'électron et le positron ainsi produits portent une partie de la polarisation de la particule initiale. Les récentes avancées dans le domaine des sources d'électrons à courants intenses (1 mA) et hautement polarisés au Jefferson Lab offrent la perspective de créer des positrons polarisés à partir d'électrons de faible énergie. Cette thèse se propose de discuter les transferts de polarisation aux positrons dans la perspective d'une optimisation du design d'une source de positron polarisée. L'expérience PEPPo, visant à mesurer la polarisation de positrons par un faisceau d'électrons de basse énergie (<10MeV) mais de basse intensité est discutée. Une démonstration concluante de cette technique fournirait une méthode alternative de produire des positrons polarisés de basse énergie et des informations utiles pour optimiser le design d'une source dans la gamme d'énergie inférieure au GeV. / The nuclear and high-energy physics communities have shown a growing interest in the availability of high current, highly-polarized positron beams. A sufficiently energetic polarized photon or lepton incident on a target may generate, via bremsstrahlung and pair creation within a solid target foil, electron-positron pairs that should carry some fraction of the initial polarization. Recent advances in high current (> 1 mA) spin polarized electron sources at Jefferson Lab offer the perspective of creating polarized positrons from a low energy electron beam. This thesis discusses polarization transfer from electrons to positrons in the perspective of the design optimization of a polarized positron source. The PEPPo experiment, aiming at a measurement of the positron polarization from a low energy (< 10 MeV) highly spin polarized electron beam is discussed. A successful demonstration of this technique would provide an alternative scheme for the production of low energy polarized positrons and useful information for the optimization of the design of polarized positron sources in the sub-GeV energy range.
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The focusing of the HKU positron beam, and an extended design for incorporating secondary electron-positron annihilation lifetime spectroscopyKwan, Pui-ying, Rebecca. January 2006 (has links)
Thesis (Ph. D.)--University of Hong Kong, 2006. / Title proper from title frame. Also available in printed format.
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Experimental studies of positron annihilation in semiconductors區皓良, Au, Ho-leung. January 1994 (has links)
published_or_final_version / Physics / Doctoral / Doctor of Philosophy
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Some defect studies on the compound semiconductors GaAs, InP and SiC using positron annihilation spectroscopyDeng, Aihong., 鄧愛紅. January 2000 (has links)
published_or_final_version / Physics / Doctoral / Doctor of Philosophy
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Improvement in positron beam optics and some positron beam studies of GaN and Amorphous-si:H thin films胡一帆, Hu, Yifan. January 2000 (has links)
published_or_final_version / Physics / Doctoral / Doctor of Philosophy
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Studies of the phase behaviour of fluids and their mixtures in confined geometries and free-volume within various polymersClarke, Andre Paul January 1997 (has links)
No description available.
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