Recent progress at SLAC extracting high charge from highly polarized photocathodes for future-collider applications

J. E. Clendenin, A. Brachmann, E. L. Garwin, S. Harvey, J. Jiang, R. E. Kirby, D. A. Luh, T. Maruyama, R. Prepost, C. Y. Prescott, J. L. Turner

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9 引文 斯高帕斯(Scopus)

摘要

Future colliders such as NLC and JLC will require a highly polarized macropulse with charge that is more than an order of magnitude beyond that which could be produced for the SLC. The maximum charge from the SLC uniformly doped GaAs photocathode was limited by the surface charge limit (SCL). The SCL effect can be overcome by using an extremely high (≥1019cm-3) surface dopant concentration. When combined with a medium dopant concentration in the majority of the active layer (to avoid depolarization), the surface concentration has been found to degrade during normal heat cleaning (1 h at 600°C). The Be dopant as typically used in an MBE-grown superlattice cathode is especially susceptible to this effect compared to Zn or C dopant. Some relief can be found by lowering the cleaning temperature, but the long-term general solution appears to be atomic hydrogen cleaning.

原文???core.languages.en_GB???
頁(從 - 到)308-311
頁數4
期刊Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
536
發行號3
DOIs
出版狀態已出版 - 11 1月 2005
事件Polarized Sources and Targets for the 21st Century - Novosibirsk, Russian Federation
持續時間: 22 9月 200326 9月 2003

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