TY - GEN
T1 - Impact of a movable limiter on the global wall recycling in TRIAM-1M
AU - Sakamoto, M.
AU - Ogawa, M.
AU - Takaki, K.
AU - Zushi, H.
AU - Nakashima, K.
AU - Maezono, N.
AU - Sugata, T.
AU - Nakashima, Y.
AU - Higashizono, Y.
AU - Kubota, Y.
AU - Higashijima, A.
AU - Nakashima, H.
AU - Kawasaki, S.
AU - Iyomasa, A.
AU - Hasegawa, M.
AU - Idei, H.
AU - Hanada, K.
AU - Nakamura, K.
AU - Sato, K. N.
N1 - Copyright:
Copyright 2013 Elsevier B.V., All rights reserved.
PY - 2005
Y1 - 2005
N2 - In TRIAM-1M, the influence of the local structure of the first wall on the global wall recycling has been studied using the ML with good cooling capability. No wall saturation was observed in the 5 h 16 min discharge with the ML, since particle release was suppressed by less temperature rise of the main chamber. The global wall pumping rate without the ML, ~8.6 x 1016 atoms m-2 s-1, is 3.6 times higher than that of the long duration discharge without the ML. The temperature rise in the wall is attributed to the transition of the wall role from the particle sink to the source. The co-deposition of hydrogen with Mo is a key for the wall role of the particle sink. No clear difference of the growth rate of Mo deposits on the viewing window located from the limiter surface between with and without the ML. The growth rate is from ~2 x 10-4nm/s to ~8 x 10-4nm/s. The toroidal structure of hydrogen recycling changes significantly near at the ML. However, integration of H intensity with and without the ML over the whole toroidal length is about the same within 3% , which is less than the error, i.e. 15%.
AB - In TRIAM-1M, the influence of the local structure of the first wall on the global wall recycling has been studied using the ML with good cooling capability. No wall saturation was observed in the 5 h 16 min discharge with the ML, since particle release was suppressed by less temperature rise of the main chamber. The global wall pumping rate without the ML, ~8.6 x 1016 atoms m-2 s-1, is 3.6 times higher than that of the long duration discharge without the ML. The temperature rise in the wall is attributed to the transition of the wall role from the particle sink to the source. The co-deposition of hydrogen with Mo is a key for the wall role of the particle sink. No clear difference of the growth rate of Mo deposits on the viewing window located from the limiter surface between with and without the ML. The growth rate is from ~2 x 10-4nm/s to ~8 x 10-4nm/s. The toroidal structure of hydrogen recycling changes significantly near at the ML. However, integration of H intensity with and without the ML over the whole toroidal length is about the same within 3% , which is less than the error, i.e. 15%.
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M3 - Conference contribution
AN - SCOPUS:84873373367
SN - 9781622763320
T3 - 32nd EPS Conference on Plasma Physics 2005, EPS 2005, Held with the 8th International Workshop on Fast Ignition of Fusion Targets - Europhysics Conference Abstracts
SP - 1930
EP - 1933
BT - 32nd EPS Conference on Plasma Physics 2005, EPS 2005, Held with the 8th International Workshop on Fast Ignition of Fusion Targets - Europhysics Conference Abstracts
T2 - 32nd European Physical Society Conference on Plasma Physics and Controlled Fusion combined with the 8th International Workshop on Fast Ignition of Fusion Targets
Y2 - 27 June 2005 through 1 July 2005
ER -