A high average current DC GaAs photocathode gun for ERLs and FELs

被引：0

作者：

Hernandez-Garcia, C ^{[1
]}

Siggins, T ^{[1
]}

Benson, S ^{[1
]}

Bullard, D ^{[1
]}

Dylla, HF ^{[1
]}

Jordan, K ^{[1
]}

Murray, C ^{[1
]}

Neil, GR ^{[1
]}

Shinn, M ^{[1
]}

Walker, R ^{[1
]}

机构：

[1] TJNAF, Newport News, VA 23606 USA

来源：

2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 | 2005年

关键词：

D O I：

暂无

中图分类号：

TH7 [仪器、仪表];

学科分类号：

0804 ; 080401 ; 081102 ;

摘要：

The Jefferson Lab (JLab) 10 kW IR Upgrade FEL DC GaAs photocathode gun is presently the highest average current electron source operational in the U.S., delivering a record 9.1 mA CW, 350 kV electron beam with 122 pC/bunch at 75 MHz rep rate. Pulsed operation has also been demonstrated with 8 mA per pulse (110 pC/bunch) in 16 ms-long pulses at 2 Hz rep rate. Routinely the gun delivers 5 mA CW and pulse current at 135 pC/bunch for FEL operations. The Upgrade DC photocathode gun is a direct evolution of the DC photocathode gun used in the previous JLab 1 kW IR Demo FEL. Improvements in the vacuum conditions, incorporation of two UHV motion mechanisms (a retractable cathode and a photocathode shield door) and a new way to add cesium to the GaAs photocathode surface have extended its lifetime to over 500 Coulombs delivered between re-cesiations (quantum efficiency replenishment). With each photocathode activation quantum efficiencies above 6% are routinely achieved. The photocathode activation and performance will be described in detail.

引用

页码：4126 / 4128

页数：3

共 11 条

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