A large-area RF source for negative hydrogen ions

In a collaboration with CEA Cadarache, IPP is presently developing an rf source, in which the production of negative ions (H{sup -}/D{sup -}) is being investigated. It utilizes PINI-size rf sources with an external antenna and for the first step a small size extraction system with 48 cm{sup 2} net e...

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Bibliographic Details
Published inAIP conference proceedings Vol. 439; no. 1
Main Authors Frank, P., Feist, J. H., Kraus, W., Speth, E., Heinemann, B., Probst, F., Trainham, R., Jacquot, C., DRFC/STID, CEA-Cadarache, EURATOM-Association, 13108 Saint Paul lez Durance
Format Journal Article
LanguageEnglish
Published United States 20.08.1998
Subjects
ANTENNAS
BEAM EXTRACTION
BEAM PRODUCTION
CEA CADARACHE
CURRENT DENSITY
DEUTERIUM IONS
DEUTERON SOURCES
ELECTRIC CURRENTS
ELECTRON DENSITY
ELECTRON TEMPERATURE
EV RANGE
HIGH-FREQUENCY DISCHARGES
HYDROGEN IONS 1 MINUS
ION BEAMS
ION SOURCES
LANGMUIR PROBE
MAGNETIC FIELD CONFIGURATIONS
MAGNETIC FILTERS
PARTICLE ACCELERATORS
PLASMA
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Summary:In a collaboration with CEA Cadarache, IPP is presently developing an rf source, in which the production of negative ions (H{sup -}/D{sup -}) is being investigated. It utilizes PINI-size rf sources with an external antenna and for the first step a small size extraction system with 48 cm{sup 2} net extraction area. First results from BATMAN (Bavarian T lowbar est Machine for N lowbar egative Ions) show (without Cs) a linear dependence of the negative ion yield with rf power, without any sign of saturation. At elevated pressure (1.6 Pa) a current density of 4.5 mA/cm{sup 2} H{sup -} (without Cs) has been found so far. At medium pressure (0.6 Pa) the current density is lower by approx. a factor of 5, but preliminary results with Cesium injection show a relative increase by almost the same factor in this pressure range. Langmuir probe measurements indicate an electron temperature T{sub e}>2 eV close to the plasma grid with a moderate magnetic filter (700 Gcm). Attempts to improve the performance by using different magnetic configurations and different wall materials are under way.
ISSN:0094-243X
1551-7616
DOI:10.1063/1.56364