Improved electron yield and spin-polarization from III-V photocathodes via bias enhanced carrier drift

Gregory A. Mulhollan, John Bierman, Axel Brachmann, James E. Clendenin, Edward Garwin, Robert Kirby, Dah An Luh, Takashi Maruyama, Richard Prepost

研究成果: 書貢獻/報告類型會議論文篇章同行評審


Spin-polarized electrons are commonly used in high energy physics. Future work will benefit from greater polarization. Polarizations approaching 90% have been achieved at the expense of yield. The primary paths to higher polarization are material design and electron transport. Our work addresses the latter. Photoexcited electrons may be preferentially emitted or suppressed by an electric field applied across the active region. We are tuning this forward bias for maximum polarization and yield, together with other parameters, e.g., doping profile. Preliminary measurements have been carried out on bulk and thin film GaAs. As expected, the yield change far from the bandgap is quite large for bulk material. The bias is applied to the bottom (non-activated) side of the cathode so that the accelerating potential as measured with respect to the ground potential chamber walls is unchanged for different frontto-back cathode bias values. The size of the bias to cause an appreciable effect is rather small reflecting the low drift kinetic energy in the zero bias case.

主出版物標題Proceedings of the Particle Accelerator Conference, PAC 2005
出版狀態已出版 - 2005
事件Particle Accelerator Conference, PAC 2005 - Knoxville, TN, United States
持續時間: 16 5月 200520 5月 2005


名字Proceedings of the IEEE Particle Accelerator Conference


???event.eventtypes.event.conference???Particle Accelerator Conference, PAC 2005
國家/地區United States
城市Knoxville, TN


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