Negative-hydrogen-ion production from a nanoporous 12CaO ∙ 7Al 2 O 3 electride surface

Mamiko Sasao (1) , Roba Moussaoui (2) , Dmitry Kogut (2) , James J. Ellis (3) , Gilles Cartry (2) , Motoi Wada (4) , Katsuyoshi Tsumori (5) , Hideo Hosono (6)

1 Doshisha University [Kyoto]
2 PIIM - Physique des interactions ioniques et moléculaires
3 YPI - York Plasma Institute
4 School of Science and Engineering [Kyoto]
5 NIFS - National Institute for Fusion Science
6 MCES - Materials Research Center for Element Strategy

A high production rate of negative hydrogen ion was observed from a nanoporous C12A7 electride surface immersed in hydrogen/deuterium low-pressure plasmas. The target was biased at 10-170 V negatively and the target surface was bombarded by H3 + ions from the plasma. The production rate was 1-2 orders higher than a clean molybdenum surface. The measured H-energy spectrum indicates that the major production mechanism is desorption by sputtering. This material has potential to be used as production surface of cesium-free negative ion sources for accelerators, heating beams in nuclear fusion, and surface modification for industrial applications.

Domains: Physics [physics]; Physics [physics]; Plasma Physics [physics.plasm-ph]

Mamiko Sasao, Roba Moussaoui, Dmitry Kogut, James J. Ellis, Gilles Cartry, et al.. Negative-hydrogen-ion production from a nanoporous 12CaO ∙ 7Al 2 O 3 electride surface. Applied Physics Express, 2018, 11 (6), pp.066201. ⟨10.7567/APEX.11.066201⟩. ⟨hal-02375754⟩