Title :
Proposed high speed pellet injection system “HIPEL” for Large Helical Device
Author :
Sudo, S. ; Kanno, M. ; Kaneko, H. ; Saka, S. ; Shirai, T. ; Baba, T.
Author_Institution :
Nat. Inst. for Fusion Sci., Nagoya, Japan
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
Keywords :
fusion reactor design; fusion reactor operation; fusion reactors; stellarators; HIPEL; Large Helical Device; flexible density profile control; flexible multiple-pellet injection system; high speed pellet injection system; pellet ablation; refueling; single-stage gun barrels; transport code; two stage pellet injector; two-stage gun barrels; Nuclear and plasma sciences; Plasma confinement; Plasma density; Plasma devices; Plasma diagnostics; Plasma properties; Plasma simulation; Plasma temperature; Plasma transport processes; Superconducting coils;
Conference_Titel :
Fusion Engineering, 1993., 15th IEEE/NPSS Symposium on
Conference_Location :
Hyannis, MA
Print_ISBN :
0-7803-1412-3
DOI :
10.1109/FUSION.1993.518276
