Intense H- beam production in a magnetically insulated ion diode

Amnon Fisher; Robert M. Prohaska; Haim Lindenbaum; G. Sheperd; Norman Rostoker

doi:10.1117/12.18585

1 April 1990 Intense H^- beam production in a magnetically insulated ion diode

Amnon Fisher, Robert M. Prohaska, Haim Lindenbaum, G. Sheperd, Norman Rostoker

Proceedings Volume 1226, Intense Microwave and Particle Beams; (1990) https://doi.org/10.1117/12.18585
Event: OE/LASE '90, 1990, Los Angeles, CA, United States

Abstract

Gas puff cathodes offer a flexible systerr to study the nchanfsr' of the negative ion foriration In a pulse power—driven cathode. A gnetica1iy Insulated gas puff diode has been built at UCI and the forntion of H has been studied. }Tydrogen an'tonia, butane and oxygen were Investigated. Very low current less than 100 rrA/cri$ of was n'esured when hydrogen or airironia were puffed into the diode. Futane and oxygen produced at least ten tiv'es higher current density. Probably the negative ion pro— duction in the butane gas puff sovrce and in the solid polyethylene cathode source is due to the interaction of electrons with long hydrocarbon chains. This irechanisw doesnt require the formation of highly excited J4', which is needed if one assuns the source of the H is tiolecular hydrogen interacting with electrons. Because oxygen is an electro—negative gas, it was expected that negative Ions would he produced. These ions were used to test the negative ion diagnostic. The divergence of the ion bean' coniing froir the gas puff cathode was about 10 wr. This is the lowest divergence that has ever been rreasured at UT. Trproved nozzles that will produce higher gas gradient between the cathode and the anode will he tested in the future.

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Amnon Fisher, Robert M. Prohaska, Haim Lindenbaum, G. Sheperd, and Norman Rostoker "Intense H^- beam production in a magnetically insulated ion diode", Proc. SPIE 1226, Intense Microwave and Particle Beams, (1 April 1990); https://doi.org/10.1117/12.18585

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KEYWORDS

Ions

Diodes

Particle beams

Plasma

Electrons

Microwave radiation

Hydrogen

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