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

Journal Article · Wed Apr 08 00:00:00 EDT 2015 · AIP Conference Proceedings

DOI:https://doi.org/10.1063/1.4916467· OSTI ID:22391447

Fiorucci, Donatella; Feng, Jiatai; Pichot, Mikhaël; Chaibi, Walid ^[1]

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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)

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.

• OSTI ID: 22391447
• Journal Information: AIP Conference Proceedings, Vol. 1655, 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); ISSN 0094-243X
• Country of Publication: United States
• Language: English

Related Subjects

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