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

doi:10.1016/j.nima.2004.08.089

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

物理學系

研究成果: 雜誌貢獻 › 會議論文 › 同行評審

10 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
卷	536
發行號	3
DOIs	https://doi.org/10.1016/j.nima.2004.08.089
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 2003 → 26 9月 2003

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10.1016/j.nima.2004.08.089

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Clendenin, J. E., Brachmann, A., Garwin, E. L., Harvey, S., Jiang, J., Kirby, R. E., Luh, D. A., Maruyama, T., Prepost, R., Prescott, C. Y., & Turner, J. L. (2005). Recent progress at SLAC extracting high charge from highly polarized photocathodes for future-collider applications. Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 536(3), 308-311. https://doi.org/10.1016/j.nima.2004.08.089

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abstract = "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.",

keywords = "Photocathodes, Photoemission, Semiconductors, Surface charge limit",

author = "Clendenin, {J. E.} and A. Brachmann and Garwin, {E. L.} and S. Harvey and J. Jiang and Kirby, {R. E.} and Luh, {D. A.} and T. Maruyama and R. Prepost and Prescott, {C. Y.} and Turner, {J. L.}",

note = "Funding Information: Work supported by Department of Energy contract DE-AC03-76SF00515. ; Polarized Sources and Targets for the 21st Century ; Conference date: 22-09-2003 Through 26-09-2003",

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Clendenin, JE, Brachmann, A, Garwin, EL, Harvey, S, Jiang, J, Kirby, RE, Luh, DA, Maruyama, T, Prepost, R, Prescott, CY & Turner, JL 2005, 'Recent progress at SLAC extracting high charge from highly polarized photocathodes for future-collider applications', Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 卷 536, 編號 3, 頁 308-311. https://doi.org/10.1016/j.nima.2004.08.089

Recent progress at SLAC extracting high charge from highly polarized photocathodes for future-collider applications. / Clendenin, J. E.; Brachmann, A.; Garwin, E. L. 等.
於: Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 卷 536, 編號 3, 11.01.2005, p. 308-311.

研究成果: 雜誌貢獻 › 會議論文 › 同行評審

TY - JOUR

T1 - Recent progress at SLAC extracting high charge from highly polarized photocathodes for future-collider applications

AU - Clendenin, J. E.

AU - Brachmann, A.

AU - Garwin, E. L.

AU - Harvey, S.

AU - Jiang, J.

AU - Kirby, R. E.

AU - Luh, D. A.

AU - Maruyama, T.

AU - Prepost, R.

AU - Prescott, C. Y.

AU - Turner, J. L.

N1 - Funding Information: Work supported by Department of Energy contract DE-AC03-76SF00515.

PY - 2005/1/11

Y1 - 2005/1/11

N2 - 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.

AB - 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.

KW - Photocathodes

KW - Photoemission

KW - Semiconductors

KW - Surface charge limit

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DO - 10.1016/j.nima.2004.08.089

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SN - 0168-9002

VL - 536

SP - 308

EP - 311

JO - Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment

JF - Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment

IS - 3

T2 - Polarized Sources and Targets for the 21st Century

Y2 - 22 September 2003 through 26 September 2003

ER -

Clendenin JE, Brachmann A, Garwin EL, Harvey S, Jiang J, Kirby RE 等. Recent progress at SLAC extracting high charge from highly polarized photocathodes for future-collider applications. Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment. 2005 1月 11;536(3):308-311. doi: 10.1016/j.nima.2004.08.089

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

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