The ITER neutral beam test facility under construction in Padova will host two experimental devices: SPIDER, a 100 kV negative H/D RF source, and MITICA, a full scale, 1 MeV deuterium beam injector. A detection system called close-contact neutron emission surface mapping (CNESM) is under development with the aim to resolve the horizontal beam intensity profile in MITICA and one of the eight beamlet groups in SPIDER, with a spatial resolution of 1.5 and 2.5 cm respectively. This is achieved by the evaluation of the map of the neutron emission due to interaction of the deuterium beam with the deuterons implanted in the beam dump surface. CNESM uses nGEM detectors, i.e. GEM detectors equipped with a cathode that also serves as neutron-proton converter foil. The diagnostic will be placed right behind the SPIDER and MITICA beam dump, i.e. in an UHV environment, but the nGEM detectors need to operate at atmospheric pressure: in order to maintain the detector at atmospheric pressure, a vacuum sealed box, that will be mounted inside the vacuum, has been designed. The box design was driven by the need to minimize the neutron attenuation and the distance between the beam dump surface and the detector active area. This paper presents the status of the CNESM diagnostic describing the design of the detector, the design of the sealed box and reporting the results obtained with the first full-size prototype under fast neutron irradiation.

Muraro, A., Croci, G., Albani, G., Cazzaniga, C., Claps, G., Cavenago, M., et al. (2015). Status of the CNESM diagnostic for SPIDER. FUSION ENGINEERING AND DESIGN, 96-97, 311-314 [10.1016/j.fusengdes.2015.06.081].

Status of the CNESM diagnostic for SPIDER

MURARO, ANDREA
;
CROCI, GABRIELE
Secondo
;
ALBANI, GIORGIA;CAZZANIGA, CARLO;REBAI, MARICA;TARDOCCHI, MARCO
Penultimo
;
GORINI, GIUSEPPE
Ultimo
2015

Abstract

The ITER neutral beam test facility under construction in Padova will host two experimental devices: SPIDER, a 100 kV negative H/D RF source, and MITICA, a full scale, 1 MeV deuterium beam injector. A detection system called close-contact neutron emission surface mapping (CNESM) is under development with the aim to resolve the horizontal beam intensity profile in MITICA and one of the eight beamlet groups in SPIDER, with a spatial resolution of 1.5 and 2.5 cm respectively. This is achieved by the evaluation of the map of the neutron emission due to interaction of the deuterium beam with the deuterons implanted in the beam dump surface. CNESM uses nGEM detectors, i.e. GEM detectors equipped with a cathode that also serves as neutron-proton converter foil. The diagnostic will be placed right behind the SPIDER and MITICA beam dump, i.e. in an UHV environment, but the nGEM detectors need to operate at atmospheric pressure: in order to maintain the detector at atmospheric pressure, a vacuum sealed box, that will be mounted inside the vacuum, has been designed. The box design was driven by the need to minimize the neutron attenuation and the distance between the beam dump surface and the detector active area. This paper presents the status of the CNESM diagnostic describing the design of the detector, the design of the sealed box and reporting the results obtained with the first full-size prototype under fast neutron irradiation.
Articolo in rivista - Articolo scientifico
Fast neutron; GEM (gas electron multiplier); NBI diagnostic; Neutron detectors; Nuclear Energy and Engineering; Materials Science (all); Civil and Structural Engineering; Mechanical Engineering
English
2015
96-97
311
314
none
Muraro, A., Croci, G., Albani, G., Cazzaniga, C., Claps, G., Cavenago, M., et al. (2015). Status of the CNESM diagnostic for SPIDER. FUSION ENGINEERING AND DESIGN, 96-97, 311-314 [10.1016/j.fusengdes.2015.06.081].
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/10281/131978
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