title: The response of a fast scintillator screen (YAP:Ce) to low energy ions (0-40 keV) and its use to detect fast-ion-loss in stellarator TJ-II.
abstract: A systematic study of scintillation materials was undertaken to improve the time resolution of the fast ion diagnostic currently installed at TJ-II stellarator. It was found that YAP:Ce (formula YAlO3:Ce, Yttrium Aluminum Perovskite doped with Cerium) ionoluminescence offers better sensitivity and time response compared to the standard detector material, SrGa2S4:Eu (TG-Green), currently used in TJ-II. A comparison between both materials was carried out by irradiating them with H+ions of up to 40 keV using a dedicated laboratory setup. It is found that for the low energy ions of interest at TJ-II, YAP:Ce offers 20 times higher sensitivity than TG-Green and much faster decay time, 27 ns versus 540 ns. It is expected that the use of YAP:Ce in combination with a faster data acquisition and an ion counting software as part of the TJ-II ion luminescent probe will provide 20 times faster data on ion loss.
authors.affiliation: Universidad Carlos III de Madrid, Leganés, Spain.
authors.forename: M
authors.initials: M
authors.lastname: Martínez
authors.affiliation: Laboratorio Nacional de Fusión, CIEMAT, Madrid, Spain.
authors.forename: B
authors.initials: B
authors.lastname: Zurro
authors.affiliation: Laboratorio Nacional de Fusión, CIEMAT, Madrid, Spain.
authors.forename: A
authors.initials: A
authors.lastname: Baciero
authors.affiliation: Laboratorio Nacional de Fusión, CIEMAT, Madrid, Spain.
authors.forename: D
authors.initials: D
authors.lastname: Jiménez-Rey
authors.affiliation: Departamento de Física, Universidad Carlos III de Madrid, Leganés, Spain.
authors.forename: V
authors.initials: V
authors.lastname: Tribaldos
authors.affiliation: Laboratorio Nacional de Fusión, CIEMAT, Madrid, Spain.
authors.forename: M
authors.initials: M
authors.lastname: Malo
authors.affiliation: Laboratorio de Metrología de Radiaciones Ionizantes, CIEMAT, Madrid, Spain.
authors.forename: M T
authors.initials: MT
authors.lastname: Crespo
authors.affiliation: Laboratorio de Metrología de Radiaciones Ionizantes, CIEMAT, Madrid, Spain.
authors.forename: D
authors.initials: D
authors.lastname: Muñoz