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Author(s):
S. Sudo, M. Kanno, H. Kaneko, S. Saka, T. Shirai, T. Baba
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Title:
Proposed High Speed Pellet Injection System "HIPEL" for Large Helical Device
Date of publication:
Nov. 1993
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Key words:
multiple-pellet injection, Large Helical Device, two-stage gas gun, HIPEL, refueling, transport diagnostics, hydrogen/deuterium pellet, low-Z material pellet
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Abstract:
From the results of the simulation study including pellet ablation and 1-D transport code, it is found that a high speed pellet injector with pellet velocity of more than 3 km/s is necessary for the penetration of the pellet with diameter of 3 mm into the core region under the expected plasma condition of Large Helical Device (LHD) of heliotron/stellarator type with superconducting coils at NIFS in Japan. Therefore, a two stage pellet injector was constructed and tested successfully in order to obtain the pellet velocity range of 3 km/s. Based upon the above results, a high speed flexible multiple-pellet injection system "HIPEL" for LHD is proposed. HIPEL consists of independent (1) 10 two-stage gun barrels and (2) 10 single-stage gun barrels. It has multi purposes such as refueling and flexible density profile control, diagnostics and the other functions.
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