Study of the 10 cm duopigatron as a source of intermediate and high mass particle beams

Thesis/Dissertation · Sun Jan 01 04:00:00 EST 1984

OSTI ID:5690222

Weber, P D

The performance of the 10 cm (ORMAK type) duopigatron as a source of intermediate and high mass ion and neutral beams is examined. Studies were conducted with argon, krypton, xenon, helium, and nitrogen as well as hydrogen. Extracted beam currents in the range of 0.5 to 1.0 amperes were obtained at accelerating voltages up to 19 kV. Source plasma instabilities, not observed in hydrogen, were examined for the higher mass gases. Mechanisms to explain the unstable behavior were proposed and tested with Langmuir probe measurements. The dependences of extracted beam current on accelerating potential, ion mass, and source plasma denity were determined and compared with existing theories for space-charge limited, and ion saturation limited extraction. Excellent agreement with these theories was obtained for the noble gases. The approach to the ion saturation regime appears to involve a change in the acceleration gap spacing, consistent with the concept of an emissive meniscus protruding between the acceleration grids. Diagnostic data was obtained from Langmuir probes, optical spectroscopy, magnetic spectrometry, particle detectors, and calorimetry.

• Research Organization: Michigan Univ., Ann Arbor (USA)
• OSTI ID: 5690222
• Country of Publication: United States
• Language: English

Related Subjects

43 PARTICLE ACCELERATORS
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700102* -- Fusion Energy-- Plasma Research-- Diagnostics
AMP BEAM CURRENTS
BEAM CURRENTS
CLOSED PLASMA DEVICES
CURRENTS
ION SOURCES
NEUTRAL BEAM SOURCES
ORMAK DEVICES
PLASMA DIAGNOSTICS
THERMONUCLEAR DEVICES
TOKAMAK DEVICES