H{sup -} extraction from electron-cyclotron-resonance-driven multicusp volume source operated in pulsed mode

Journal Article · Wed Mar 15 04:00:00 EST 2006 · Review of Scientific Instruments

DOI:https://doi.org/10.1063/1.2165270· OSTI ID:20778997

Svarnas, P; Bacal, M; Auvray, P; Bechu, S; Pelletier, J ^[1]

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1. LPTP, Ecole Polytechnique, UMR 7648 du CNRS, 91128 Palaiseau (France)

H{sub 2} microwave (2.45 GHz) pulsed plasma is produced from seven elementary electron cyclotron resonance sources installed into the magnetic multipole chamber 'Camembert III' (Ecole Polytechnique-Palaiseau) from which H{sup -} extraction takes place. The negative-ion and electron extracted currents are studied through electrical measurements and the plasma parameters by means of electrostatic probe under various experimental conditions. The role of the plasma electrode bias and the discharge duty cycle in the extraction process is emphasized. The gas breakdown at the beginning of every pulse gives rise to variations of the plasma characteristic parameters in comparison with those established at the later time of the pulse, where the electron temperature, the plasma potential, and the floating potential converge to the values obtained for a continuous plasma. The electron density is significantly enhanced in the pulsed mode.

• OSTI ID: 20778997
• Journal Information: Review of Scientific Instruments, Journal Name: Review of Scientific Instruments Journal Issue: 3 Vol. 77; ISSN 0034-6748; ISSN RSINAK
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
COMPARATIVE EVALUATIONS
ELECTRON CYCLOTRON-RESONANCE
ELECTRON DENSITY
ELECTRON TEMPERATURE
ELECTRONS
ELECTROSTATIC PROBES
GHZ RANGE 01-100
HYDROGEN
HYDROGEN IONS 1 MINUS
ION SOURCES
ION TEMPERATURE
MICROWAVE RADIATION
PARTICLE BEAMS
PLASMA
PLASMA DENSITY
PLASMA POTENTIAL
PULSES