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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

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

st merging ts 3 high power heating of merging enables quick formation of a high b st plasma
ST Merging (TS-3): High power heating of merging enables quick formation of a high-b ST plasma
slide3

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

new merging st experiment @ univ tokyo

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

example of lrdiag simulation
Example of LRDIAG Simulation

Bt = 4.5 kG

Optimization with updated PF1A will be completed prior to execution of XP

planned sequence
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.