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Merging-Compression Start-up

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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Merging-Compression Start-up

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  1. 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 3) high efficiency hmerging (>> hRF) startup of ST plasmas. Flux for separation (field index control) EC ionization Flux for formation/ merging

  2. ST Merging (TS-3): High power heating of merging enables quick formation of a high-b ST plasma

  3. Coils ST ST ECH ST ST ST TS-3/4 Coils 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

  4. Smal l ST Coils ST ECH ST ST Coils Smal l ST New 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 • MW-GW class heating power 2) Efficient formation of ST without CS coil 3) Injection of toroidal flux (helicity) 4) Profile control effect Can also explore current-drive by intermittent merging

  5. Example of LRDIAG Simulation Bt = 4.5 kG Optimization with updated PF1A will be completed prior to execution of XP

  6. Planned sequence 1) Start with merging scenario with X-point • Two field nulls are created inside the vacuum vessel (top/bottom) by PF1A and PF5 coils • PF2, PF3 and PF5 are used to drive current and compress the plasma • About 100 kA of plasma current is expected to be driven, if successful 2) Optimize current rise • Vary initial field null configuration • Vary subsequent poloidal field evolution for merging and compression 3) If successful, try merging scenario without X-point • Available EC power may be insufficient for this scenario This experiment requires diagnosis of start-up plasma at low current and low density.

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