Performance of magnesium cathode in the S-band RF gun

被引：0

作者：

Srinivasan-Rao, T ^{[1
]}

Ben-Zvi, I ^{[1
]}

Smedley, J ^{[1
]}

Wang, XJ ^{[1
]}

Woodle, M ^{[1
]}

Palmer, DT ^{[1
]}

Miller, RH ^{[1
]}

机构：

[1] Assoc Univ Inc, Brookhaven Natl Lab, Upton, NY 11973 USA

来源：

PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS | 1998年

关键词：

D O I：

暂无

中图分类号：

TM [电工技术]; TN [电子技术、通信技术];

学科分类号：

0808 ; 0809 ;

摘要：

In this paper, we present the preliminary results of the performance of magnesium cathode in a high frequency RF gun. The quantum efficiency of Mg showed a dramatic improvement upon laser cleaning, increasing from 10(-5) to 4x10(-4) after two hours of cleaning, and to 2x10(-3) after systematic cleaning. The cleaning procedure for this increase is described in detail. Charge measured as a function of the laser injection phase relative to the RF phase indicates that the temporal variation of the field on the cathode both due to the RF and the shielding effect of the emitted electrons play a critical role in the emission and extraction of electrons. A model that includes this variation is numerically fitted to the measured charge and the results are presented. The unexpected outcome of the fit was the low field enhancement factor (0.1) predicted by the model for the photoemission. The physical origin of this is still under investigation.

引用

页码：2790 / 2792

页数：3

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