TY - JOUR
T1 - Surface temperature effects on hydrogen and impurity release from the limiter studied by means of visible and near infrared spectroscopic measurement in TRIAM-1M
AU - Bhattacharyay, R.
AU - Zushi, H.
AU - Nakashima, K.
AU - Shikama, T.
AU - Sakamoto, M.
AU - Ogawa, M.
AU - Nakamura, K.
AU - Yoshida, N.
AU - Kado, S.
AU - Sawada, K.
AU - Hirooka, Y.
AU - Hanada, K.
AU - Sato, K. N.
AU - Idei, H.
AU - Sasaki, K.
AU - Xu, H.
AU - Hasegawa, M.
AU - Uehara, K.
AU - Tsushima, A.
AU - Kimura, N.
AU - Nozaki, Y.
AU - Kawasaki, S.
AU - Nakashima, H.
AU - Higashijima, A.
N1 - Funding Information:
The authors would like to thank Professor Yokamine for providing the computer code for the calculation of temperature distribution on the ML surface. This work is partially supported by a Grant-in-aid for Scientific Research from Ministry of Education, Science and Culture of Japan.
PY - 2007/6/15
Y1 - 2007/6/15
N2 - Tokamak operation has been performed under the localized plasma wall interaction conditions in TRIAM-1M, using a water cooled rail movable limiter (ML) made of Molybdenum. The limiter surface temperature dependence on hydrogen recycling and neutral molybdenum impurity production behaviour has been studied using visible as well as infrared spectroscopy during low power long pulse and high power short pulse discharges. In these experiments it is considered that escaped energetic electrons are lost mainly on ML and localised heat deposition makes a 'hot spot' on ML. It has been observed that H2, Hα and MoI intensities critically depend on the hot spot temperature (Thot) and enhanced recycling due to localized PWI on ML can fuel the discharge without any external fueling source.
AB - Tokamak operation has been performed under the localized plasma wall interaction conditions in TRIAM-1M, using a water cooled rail movable limiter (ML) made of Molybdenum. The limiter surface temperature dependence on hydrogen recycling and neutral molybdenum impurity production behaviour has been studied using visible as well as infrared spectroscopy during low power long pulse and high power short pulse discharges. In these experiments it is considered that escaped energetic electrons are lost mainly on ML and localised heat deposition makes a 'hot spot' on ML. It has been observed that H2, Hα and MoI intensities critically depend on the hot spot temperature (Thot) and enhanced recycling due to localized PWI on ML can fuel the discharge without any external fueling source.
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U2 - 10.1016/j.jnucmat.2007.01.117
DO - 10.1016/j.jnucmat.2007.01.117
M3 - Article
AN - SCOPUS:34248597730
VL - 363-365
SP - 938
EP - 943
JO - Journal of Nuclear Materials
JF - Journal of Nuclear Materials
SN - 0022-3115
IS - 1-3
ER -