Regular and asymmetric negative ion magnetron sources with grooved cathodes

Autor:	Th. Sluyters, J. G. Alessi
Rok vydání:	1980
Předmět:	Materials science Physics::Instrumentation and Detectors Cathode law.invention Anode Ion Physics::Plasma Physics law Electrode Cavity magnetron Physics::Accelerator Physics Thermal emittance Beam emittance Atomic physics Instrumentation Current density
Zdroj:	Review of Scientific Instruments. 51:1630-1633
ISSN:	1089-7623 0034-6748
DOI:	10.1063/1.1136152
Popis:	A significant improvement in the performance of the BNL Mark III magnetron negative ion sources has been achieved by putting cylindrical grooves on the cathode to geometrically focus surface produced H− and D− ions into the emission slit in the anode. The addition of these grooves has allowed us to reach desired negative ion emission current densities with an order of magnitude lower arc current than was previously required. An additional improvement in the operation of the magnetron has resulted from increasing the anode‐to‐cathode spacing in the back of the source, which facilitates ignition of the discharge at low pressures. The net result of these modifications has been an improvement in the gas and power efficiencies by at least a factor of three, and a reduction in the emittance of the beam.
Databáze:	OpenAIRE
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