30E22P
ヘリオトロンJにおけるICRFによる高速イオンエネルギースペクトルの空間・磁場配位依存性	 
Dependence of Fast Ions Generated by ICRF Minority Heatingon Magnetic Field and Spatial Position in Heliotron J	 
和多田泰士 1, 岡田浩之2, 小林進二2, H.Y.Lee1, 原田伴誉1, 水内亨2, 長崎百伸2,南貴司2, 山本聡2, 大島慎介2, 本島滋2, N.Shi2, L.Zang1, 荒井翔平1, 杉本幸薫1, 福島浩文1,
釼持尚輝1, 永榮蓉子1, 橋本紘平1, 中村祐司1, 笠嶋慶純1, M.Sha1, 佐野史道2
Hiroto Watada1, Hiroyuki Okada2, Shinji Kobayashi2, H.Y.Lee1, Tomotaka Harada1, et al	 1
京大エネ科 ,	 京大エネ研2
GSES Kyoto Univ.1, IAE Kyoto Univ.2
Confinement of high-energy particles is an
important issue for plasma heating. Using fast
protons generated by ion cyclotron range offrequencies (ICRF) minority heating in Heliotron J,generation and confinement of fast protons havebeen investigated experimentally. In the previous
researches for the dependences of effective
temperature of hydrogen and deuterium temperatureon heating position, the observed results were notconsistent with the expectation from the standard
heating mechanism of minority heating. It’s
possible that measured fast protons do not representthe characteristic of averaged fast protons. The aimof this study is to carry out the investigation of thespatial distribution of fast protons in the wide areaof the vertical cross-section and to clarify the effectof generation and confinement of fast protons onmagnetic configurations (bumpiness).
An ICRF wave was injected into electron
cyc1otron heated (ECH) plasmas. The ICRF
frequency of 23.2 MHz was selected for the highbumpiness and 19.0 MHz was selected for the low
bumpiness for the on-axis heating. Theline-averaged electron density is 0.4 x 1019 m-3, the70-GHz ECH injection power is 0.30-0.35 MW,
and the ICRF injection power is 0.25-0.30 MW.
The minority ratio (H/H+D) is about 10 %. By
using a charge exchange neutral particle analyzer(CX-NPA) of an E//B type, energetic ions areobserved.
The energy spectra of hydrogen and deuterium
measured in the high bumpiness and low bumpinessat the horizontal angle 0° are illustrated in Fig.1. In
medium bumpiness, the vertical angle dependenceof the energy spectra is relatively weak. On theother hand, in the high bumpiness, the verticalangle dependence of the energy spectra is found.
The effective temperature of hydrogen wasmeasured from the gradient of plotted data from theenergy range of 1 keV to 6 keV (See Fig.2). The
effective temperature of hydrogen is almost same ateach angle in the medium bumpiness. However, inthe high bumpiness, the vertical angle dependence
was found to be strong. The most significant
horizontal dependence was found at the verticalangle 2°. The previous study indicated that thespatial	  change of fast protons is large only in theinner-side heating of the medium bumpiness.
However, this result indicates the spatial change offast protons is large even in the center heating of
the high bumpiness. In each angle, the effective
temperature of fast protons in the high bumpiness islarger than that in the medium bumpiness. It isclarified that the generation and confinement of fast
protons by using ICRF heating are the mostefficient in the high bumpiness.

Fig.1：The energy spectra of hydrogen in the medium
bumpiness (left) and the high bumpiness (right)

Fig.2：The effective temperature of hydrogen in the medium
bumpiness (left) and the high bumpiness (right)