03pA07
ヘリオトロンJ三次元磁場配位における平行フロー速度計測
Parallel flow velocity measurements in three-dimensional magnetic configuration of Heliotron J

小林進二, Lee Hyunyong1, 西岡賢二2, 水内亨, 長崎百伸, 岡田浩之, 南貴司, 門信一郎,山本聡, 大島慎介, 木島滋, 中村祐司2, 西村伸3, 横山雅之3, 村上定義4, 渡邊清政3,
關良輔3, 原田伴誉2, 桐本充晃2, 佐野史道
1
S. Kobayashi, H. Y. Lee , K. Nishioka2, T. Mizuuchi, K. Nagasaki, H. Okada, T. Minami, S. Kado,
S. Yamamoto, S. Ohshima, S. Konoshima, Y. Nakamura, S. Nishimura, M. Yokoyama, et al.,
京大エネ理工、1KAIST、2京大エネ科、3核融合研、4京大院工IAE, Kyoto Univ., 1KAIST, 2GSES, Kyoto Univ., 3NIFS, 4Grad Sch. Eng., Kyoto Univ.
the ripple configurations, the parallel flow
velocities by the measurement results are consistent
with the neoclassical transport analysis. Even in thecounter-directed NBI case, the reversal of the flow
velocity to the co-direction can be reproduced by
the analysis. From the analysis the radial
thermodynamic force is a candidate to explain thespontaneous rotation.
References[1] H.Y. Lee, et al., PPCF 55 (2013) 035012.
[2] S. Kobayashi et al., 19th ISHW (2013) O24.
[3] K. Nishioka et al., 19th ISHW (2013) I12.
2010Co-NB

NC transport
analysis0CXRS||v ,<u B>/B (km/s)

(a)

||-10
Ctr-NB

Standard ripple
-20
0

0.2

0.4

0.6

0.8

1r/a20(b)10Co-NB

NC transport
analysis0||v , <u B>/B (km/s)

Ctr-NB-10||In order to clarify the effect of the magnetic fieldcomponent on the parallel flow in threedimensional magnetic field configurations, we haveinvestigated the role of the toroidal mirror ripple on
the parallel flow in the neutral-beam-injection(NBI) heated plasmas of Heliotron J [1,2]. In thisstudy, we try to understand the mechanism of theparallel flow within the framework of theneoclassical transport.
Two magnetic configurations with different
toroidal mirror ripple components, high andstandard ripple configurations, are used to examine
the effect on the parallel flow velocity under thecondition that the external torque is applied by NBI.
The parallel flow velocity at the core region, whichis measured by the technique of the charge
exchange recombination spectroscopy (CXRS),
depends on the ripple strength. The closed symbols
in Figs 1(a) and (b) show the parallel flow velocity
with CXRS as a function of minor radius for thestandard and high ripple configurations. In the caseof the co-directed NBI at the injection power of0.5MW, the flow velocity at standard ripple case ismeasured to be around 10km/s in the co-direction
and it is 2-3 times higher than that for the highmirror ripple configuration. In the peripheral region(r/a0.6), on the contrary, the parallel flow velocity(2-3km/s) in the co-directed NBI is not sensitive tothe ripple strength. Since the Fokker-Planck
analysis shows the external torque at the peripheral
region is small, this indicates existence of
spontaneous rotation in the peripheral region of
Heliotron J. In the standard ripple configuration
with the counter-directed NBI case, a reversal of theflow velocity to the co-direction is observed in theperipheral (r/a>0.6) region.
The neoclassical transport analysis using moment
method is carried out to evaluate the parallel flow
velocity by taking the effect of the external torqueinput into account [3]. The solid lines in Figs 1(a)and 1(b) show the calculated parallel flow velocity
with the neoclassical transport analysis. For both

CXRS
-2000.2

High ripple

0.4

0.6

0.8

1r/aFig. 1. Radial profile of parallel flow velocity
measured by CXRS (closed symbols) andcalculated with neoclassical transport
analysis (solid-lines) in the (a) standard and(b) high ripple configurations of Heliotron J.