Langmuir probes for SPIDER (Source for the production of Ions of Deuterium Extracted from Radio Frequency plasma) experiment: tests in BATMAN (BAvarian Test Machine for Negative ions)

A prototype system of the Langmuir probes for SPIDER (Source for the production of Ions of Deuterium Extracted from RF plasma) was manufactured and experimentally qualified. The diagnostic was operated in RF (Radio Frequency) plasmas with cesium evaporation on the BATMAN (BAvarian Test MAchine for N...

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Bibliographic Details
Published in:Review of scientific instruments 2014-11, Vol.85 (11), p.11D832-11D832
Main Authors: Brombin, M, Spolaore, M, Serianni, G, Pomaro, N, Taliercio, C, Dalla Palma, M, Pasqualotto, R, Schiesko, L
Format: Article
Language:English
Subjects:
ANIONS
CESIUM
Compensation
Deuterium
DEUTERIUM IONS
Diagnostic systems
ELECTRODES
EVAPORATION
INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY
INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY
Insulation
LANGMUIR PROBE
Negative ions
PLASMA
Plasmas (physics)
Radio frequency
Radio frequency plasma
RADIOWAVE RADIATION
Scientific apparatus & instruments
TEST FACILITIES
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Summary:A prototype system of the Langmuir probes for SPIDER (Source for the production of Ions of Deuterium Extracted from RF plasma) was manufactured and experimentally qualified. The diagnostic was operated in RF (Radio Frequency) plasmas with cesium evaporation on the BATMAN (BAvarian Test MAchine for Negative ions) test facility, which can provide plasma conditions as expected in the SPIDER source. A RF passive compensation circuit was realised to operate the Langmuir probes in RF plasmas. The sensors' holder, designed to better simulate the bias plate conditions in SPIDER, was exposed to a severe experimental campaign in BATMAN with cesium evaporation. No detrimental effect on the diagnostic due to cesium evaporation was found during the exposure to the BATMAN plasma and in particular the insulation of the electrodes was preserved. The paper presents the system prototype, the RF compensation circuit, the acquisition system (as foreseen in SPIDER), and the results obtained during the experimental campaigns.
ISSN:0034-6748
1089-7623
DOI:10.1063/1.4890601