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Title: Thermal effects in high power cavities for photoneutralization of D{sup −} beams in future neutral beam injectors

Photoneutralization may represent a key issue in the neutral beam injectors for future fusion reactors. In fact, photodetachment based neutralization combined with an energy recovery system increase the injector overall efficiency up to 60%. This is the SIPHORE injector concept in which photoneutralization is realized in a refolded cavity [1]. However, about 1 W of the several megaWatts intracavity power is absorbed by the mirrors coatings and gives rise to important thermoelastic distortions. This is expected to change the optical behavior of the mirrors and reduce the enhancement factor of the cavity. In this paper, we estimate these effects and we propose a thermal system to compensate it.
Authors:
; ; ;  [1]
  1. ARTEMIS, Université de Nice Sophia Antipolis, Observatoire de la Côte d'Azur and Centre National de la Recherche Scientifique, Boulevard de l'Observatoire - CS 34229 - F 06304 (France)
Publication Date:
OSTI Identifier:
22391447
Resource Type:
Journal Article
Resource Relation:
Journal Name: AIP Conference Proceedings; Journal Volume: 1655; Journal Issue: 1; Conference: NIBS 2014: 4. International Symposium on Negative Ions, Beams and Sources, Garching (Germany), 6-10 Oct 2014; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
43 PARTICLE ACCELERATORS; 71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; ANIONS; BEAM INJECTION HEATING; CAVITY RESONATORS; COATINGS; DEUTERIUM IONS; EFFICIENCY; ENERGY RECOVERY; ION BEAMS; MIRRORS; NEUTRAL ATOM BEAM INJECTION; TEMPERATURE DEPENDENCE; THERMOELASTICITY; THERMONUCLEAR REACTORS