Faraday-cup-type lost fast ion detector on Heliotron J

S Yamamoto; K Ogawa; M Isobe; D S Darrow; S Kobayashi; K Nagasaki; H Okada; T Minami; S Kado; S Ohshima; G M Weir; Y Nakamura; S Konoshima; N Kemmochi; Y Ohtani; T Mizuuchi

doi:10.1063/1.4960310

Faraday-cup-type lost fast ion detector on Heliotron J

Rev Sci Instrum. 2016 Nov;87(11):11D818. doi: 10.1063/1.4960310.

Authors

S Yamamoto¹, K Ogawa², M Isobe², D S Darrow³, S Kobayashi¹, K Nagasaki¹, H Okada¹, T Minami¹, S Kado¹, S Ohshima¹, G M Weir¹, Y Nakamura⁴, S Konoshima¹, N Kemmochi², Y Ohtani⁴, T Mizuuchi¹

Affiliations

¹ Institute of Advanced Energy, Kyoto University, Gokasho, Uji, Kyoto 611-0011, Japan.
² National Institute for Fusion Science, National Institutes of Natural Sciences, 322-6 Oroshi, Toki, Gifu 509-5292, Japan.
³ Princeton Plasma Physics Laboratory, Princeton, New Jersey 08543, USA.
⁴ Graduate School of Energy Science, Kyoto University, Gokasho, Uji, Kyoto 611-0011, Japan.

PMID: 27910618
DOI: 10.1063/1.4960310

Abstract

A Faraday-cup type lost-fast ion probe (FLIP) has been designed and installed in Heliotron J for the purpose of the studies of interaction between fast ions and MHD instabilities. The FLIP can measure the co-going fast ions whose energy is in the range of 1.7-42.5 keV (proton) and pitch angle of 90^∘-140^∘, especially for fast ions having the injection energy of neutral beam injection (NBI). The FLIP successfully measured the re-entering passing ions and trapped lost-fast ions caused by fast-ion-driven energetic particle modes in NBI heated plasmas.