XP511. Merging-Compression Start-up. Y. Takase, Y. Ono, O. Mitarai, D. Gates, J. Menard, R. Raman, J.R. Wilson, M. Yamada, S. Zweben, et al. New scenario of solenoidless start-up by merging of two STs formed by external PF coils Advantages: 1) high-power heating 2) electrode-free
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Y. Takase, Y. Ono, O. Mitarai, D. Gates, J. Menard,
R. Raman, J.R. Wilson, M. Yamada, S. Zweben, et al.
New scenario of solenoidless start-up by merging of two STs formed by external PF coils
Advantages: 1) high-power heating
3) high efficiency hmerging (>> hRF)
startup of ST plasmas.
Flux for separation
(field index control)
Flux for formation/
1) Two merging STs were produced by internal PF coils (TS-3/4)2) One ST/tokamak was produced by external PF coils with ECH (TST-2, JT-60).
Merging start-up of high-b ST without X-points
STNew Merging ST Experiment (@ Univ. Tokyo)
Merging of two STs produced by external PF coil induction at X-points high-b ST startup
We can expect
2) Efficient formation of
ST without CS coil
3) Injection of toroidal
4) Profile control effect
Can also explore
Bt = 4.5 kG
Optimization with updated PF1A will be completed prior to execution of XP
1) Start with merging scenario with X-point
2) Optimize current rise
3) If successful, try merging scenario without X-point
This experiment requires diagnosis of start-up plasma at low current and low density.