title: 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).
abstract: 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.
authors.affiliation: Consorzio RFX, Corso Stati Uniti 4, I-35127 Padova, Italy.
authors.forename: M
authors.initials: M
authors.lastname: Brombin
authors.affiliation: Consorzio RFX, Corso Stati Uniti 4, I-35127 Padova, Italy.
authors.forename: M
authors.initials: M
authors.lastname: Spolaore
authors.affiliation: Consorzio RFX, Corso Stati Uniti 4, I-35127 Padova, Italy.
authors.forename: G
authors.initials: G
authors.lastname: Serianni
authors.affiliation: Consorzio RFX, Corso Stati Uniti 4, I-35127 Padova, Italy.
authors.forename: N
authors.initials: N
authors.lastname: Pomaro
authors.affiliation: Consorzio RFX, Corso Stati Uniti 4, I-35127 Padova, Italy.
authors.forename: C
authors.initials: C
authors.lastname: Taliercio
authors.affiliation: Consorzio RFX, Corso Stati Uniti 4, I-35127 Padova, Italy.
authors.forename: M
authors.initials: M
authors.lastname: Dalla Palma
authors.affiliation: Consorzio RFX, Corso Stati Uniti 4, I-35127 Padova, Italy.
authors.forename: R
authors.initials: R
authors.lastname: Pasqualotto
authors.affiliation: Max-Planck-Institut für Plasmaphysik, Boltzmannstr. 2, 85748 Garching, Germany.
authors.forename: L
authors.initials: L
authors.lastname: Schiesko