Intermediate and high-mass ion beams from a 10-cm duopigatron
Experimental studies of a 10-cm Duopigatron as a source of argon, krypton, and xenon ion beams are reported. Source plasma instabilities are examined, and the mass dependence of oscillation frequencies and instability onset conditions are determined. Arc current and density oscillations are found to be associated with ion acoustic fluctuations with frequencies scaling as 1/M /SUP 1/2/ . Langmuir probe measurements within the source plasma double layer are used to indicate the physical mechanism responsible for the observed large-amplitude arc current shifts. Ion beams have been extracted at energies up to 18kV, and drain currents up to 540 mA for argon, 440 mA for krypton, and 520 mA for xenon have been achieved with source plasma densities in the range 10/sup 11/-10/sup 12/ cm/sup -3/. Excellent agreement with existing theoretical models has been obtained in the mass and density dependence of the extraction current, as well as the voltage at which transition from space-charge limited to ion saturation emission occurs.
- Research Organization:
- Univ. of Michigan, Ann Arbor, MI
- OSTI ID:
- 6765427
- Journal Information:
- Plasma Chem. Plasma Process.; (United States), Vol. 4:2
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
DUOPLASMATRONS
PERFORMANCE
ION BEAMS
BEAM EXTRACTION
PENNING ION SOURCES
THERMONUCLEAR DEVICES
NEUTRAL ATOM BEAM INJECTION
ARGON IONS
BEAM INJECTION HEATING
CURRENT DENSITY
KEV RANGE 10-100
KRYPTON IONS
MILLI AMP BEAM CURRENTS
PLASMA DENSITY
PLASMA INSTABILITY
XENON IONS
BEAM CURRENTS
BEAM INJECTION
BEAMS
CHARGED PARTICLES
CURRENTS
ELECTRON TUBES
ENERGY RANGE
HEATING
INSTABILITY
ION SOURCES
IONS
KEV RANGE
PLASMA HEATING
PLASMATRONS
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