TY - JOUR
T1 - Multipoint spectroscopy measurement of spherical tokamak heating by magnetic reconnection in UTST
AU - Kamio, Shuji
AU - Cao, Qinghong
AU - Abe, Keita
AU - Sakumura, Morio
AU - Suzuki, Naoto
AU - Watanabe, Takenori G.
AU - Ishiguchi, Koji
AU - Imazawa, Ryota
AU - Yamada, Takuma
AU - Inomoto, Michiaki
AU - Takase, Yuichi
AU - Ono, Yasushi
PY - 2011/12/1
Y1 - 2011/12/1
N2 - The temporal evolution of ion temperature and flow was observed to investigate the heating effect of plasma merging in the UTST device by using a multipoint Doppler spectroscopy measurement system. The bulk plasma ion temperature measured by a carbon impurity line was about 15-20 eV after plasma merging. In addition, anomalous broadening of the carbon line width was observed only in the early phase of plasma merging. Since carbon impurity emission comes mainly from the X-point and the vicinity of the center stack, the broad spectrum is considered to consist of a radially bi-directional outflow component from the X-point and a stationary component near the center stack. The outflow velocity estimated from the spectroscopy was about 24 km/s, which agreed well with both an Alfv́en velocity of 22 km/s and a velocity of the reconnected field line motion of 35 km/s.
AB - The temporal evolution of ion temperature and flow was observed to investigate the heating effect of plasma merging in the UTST device by using a multipoint Doppler spectroscopy measurement system. The bulk plasma ion temperature measured by a carbon impurity line was about 15-20 eV after plasma merging. In addition, anomalous broadening of the carbon line width was observed only in the early phase of plasma merging. Since carbon impurity emission comes mainly from the X-point and the vicinity of the center stack, the broad spectrum is considered to consist of a radially bi-directional outflow component from the X-point and a stationary component near the center stack. The outflow velocity estimated from the spectroscopy was about 24 km/s, which agreed well with both an Alfv́en velocity of 22 km/s and a velocity of the reconnected field line motion of 35 km/s.
UR - http://www.scopus.com/inward/record.url?scp=84861120260&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=84861120260&partnerID=8YFLogxK
U2 - 10.1585/pfr.6.2401033
DO - 10.1585/pfr.6.2401033
M3 - Article
AN - SCOPUS:84861120260
SN - 1880-6821
VL - 6
JO - Plasma and Fusion Research
JF - Plasma and Fusion Research
IS - 1 SPECIAL ISSUE
M1 - 2401033
ER -