title: Electrostatic sensors for SPIDER experiment: design, manufacture of prototypes, and first tests.
abstract: A system of electrostatic sensors has been designed for the SPIDER (Source for the production of Ions of Deuterium Extracted from RF plasma) experiment, prototype RF source of the ITER NBI (neutral beam injection). A prototype of the sensor system was manufactured and tested at the BATMAN (BAvarian Test MAchine for Negative ions) facility, where the plasma environment is similar to that of SPIDER. Different aspects concerning the mechanical manufacturing and the signal conditioning are presented, among them the RF compensation adopted to reduce the RF effects which could lead to overestimated values of the electron temperature. The first commissioning tests provided ion saturation current values in the range assumed for the design, so the deduced plasma density estimate is consistent with the expected values.
authors.affiliation: Consorzio RFX, Associazione Euratom-Enea sulla Fusione, Corso Stati Uniti 4, I-35127 Padova, Italy.
authors.forename: M
authors.initials: M
authors.lastname: Brombin
authors.affiliation: Consorzio RFX, Associazione Euratom-Enea sulla Fusione, Corso Stati Uniti 4, I-35127 Padova, Italy.
authors.forename: M
authors.initials: M
authors.lastname: Spolaore
authors.affiliation: Consorzio RFX, Associazione Euratom-Enea sulla Fusione, Corso Stati Uniti 4, I-35127 Padova, Italy.
authors.forename: G
authors.initials: G
authors.lastname: Serianni
authors.affiliation: Consorzio RFX, Associazione Euratom-Enea sulla Fusione, Corso Stati Uniti 4, I-35127 Padova, Italy.
authors.forename: A
authors.initials: A
authors.lastname: Barzon
authors.affiliation: Consorzio RFX, Associazione Euratom-Enea sulla Fusione, Corso Stati Uniti 4, I-35127 Padova, Italy.
authors.forename: L
authors.initials: L
authors.lastname: Franchin
authors.affiliation: Consorzio RFX, Associazione Euratom-Enea sulla Fusione, Corso Stati Uniti 4, I-35127 Padova, Italy.
authors.forename: R
authors.initials: R
authors.lastname: Pasqualotto
authors.affiliation: Consorzio RFX, Associazione Euratom-Enea sulla Fusione, Corso Stati Uniti 4, I-35127 Padova, Italy.
authors.forename: N
authors.initials: N
authors.lastname: Pomaro
authors.affiliation: Max-Planck-Institut für Plasmaphysik, EURATOM Association, 1533, D-85740 Garching, Germany.
authors.forename: L
authors.initials: L
authors.lastname: Schiesko
authors.affiliation: Consorzio RFX, Associazione Euratom-Enea sulla Fusione, Corso Stati Uniti 4, I-35127 Padova, Italy.
authors.forename: C
authors.initials: C
authors.lastname: Taliercio
authors.affiliation: Consorzio RFX, Associazione Euratom-Enea sulla Fusione, Corso Stati Uniti 4, I-35127 Padova, Italy.
authors.forename: L
authors.initials: L
authors.lastname: Trevisan