A HIGH-CURRENT H- RADIO-FREQUENCY VOLUME ION-SOURCE

被引:12
作者
SAADATMAND, K [1 ]
ARBIQUE, G [1 ]
HEBERT, J [1 ]
VALICENTI, R [1 ]
LEUNG, KN [1 ]
机构
[1] UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,BERKELEY,CA 94720
关键词
D O I
10.1063/1.1145519
中图分类号
TH7 [仪器、仪表];
学科分类号
0804 ; 080401 ; 081102 ;
摘要
The superconducting super collider rf-driven volume ion source routinely provided 35 kV, > 30 mA H- beams with normalized rms emittances (εn-rms) <0.1 π mm mrad. The source was typically operated with a 100 μs beam pulse width at a 10 Hz repetition rate. To enhance H - output, the ion source was modified to accommodate a set of cesium dispensers so that a trace amount of cesium could be introduced into the plasma grid collar. A plasma grid heater element controls the temperature of the cesiated surfaces and the rate of cesium dispensation. Beam currents in excess of 100 mA and electron to H- current ratios close to one have been observed. Emittance measurements at 70 mA suggest a 20% increase over uncesiated emittance values. Improvements in the beam emittance are fully expected when the extraction optics are optimized. This enhanced, very reliable source is a strong candidate for high current H- accelerators. © 1995 American Institute of Physics.
引用
收藏
页码:3438 / 3442
页数:5
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