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XP511. LRDIAG Model with new PF1A. Merging Start-up. PF2. Y. Takase, Y. Ono, O. Mitarai, D. Gates, J. Menard, R. Raman, J.R. Wilson, M. Yamada, S. Zweben, et al. PF3. PF1A. PF4. Demonstrate I p start-up by merging of two ST plasmas, using only outboard PF coils. PF5.

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merging start up

XP511

LRDIAG Model

with new PF1A

Merging Start-up

PF2

Y. Takase, Y. Ono, O. Mitarai, D. Gates, J. Menard,

R. Raman, J.R. Wilson, M. Yamada, S. Zweben, et al.

PF3

PF1A

PF4

Demonstrate Ip start-up by merging of two ST plasmas, using only outboard PF coils

PF5

Plasma Region

  • Plasmas are initiated at X-points at top/bottom of vacuum vessel (PF1A, PF2, PF4)
  • Ip ramped up by induction from PF coils (PF2, PF3, PF4, PF5)

Rapid formation of high-b ST plasma may be realized by ion heating due to reconnection

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
new merging st experiment @ univ tokyo

Smal

l

ST

Coils

ST

High-b

ST

ECH

ST

Coils

Smal

l

ST

New Merging ST Experiment (@ Univ. Tokyo)

Merging of two STs produced by external PF coils  high-b ST

example of lrdiag simulation
Example of LRDIAG Simulation

PF2

Bt = 0.45 T

(REC = 0.6 m)

PF1A

PF1A

PF4

X-points

PF2

PF3

PF2

PF3

PF4

PF5

PF5

experimental run plan
Experimental Run Plan
  • Pressure scan (5 shots)
  • Toroidal field scan: Bt = 0.45 T  0.3 T, 0.6T (2 shots)
  • Vary X-point location: RX = 0.9 m  0.75 m, 0.6 m (2 shots)
  • Vary PF current ramp time: 20 ms  10ms, 50ms (2 shots)

[Vl = 3 V  4V, 1.7V]

  • Reduce EC power (4 shots)
  • Optimize further Ip ramp-up (~ 10 shots)

[PF current ramp rate, ramp timing, relative magnitudes]

  • Optimize ion heating due to reconnection (~ 5 shots)

~ 100 kA of plasma current is expected, if successful

required capabilities
Required Capabilities
  • EC preionization at full power
  • PF4 (opposite polarity to PF5) ~ 2 kA

polarities as follows (+ in the direction of Ip):

PF1A +/-

PF2 +/-

PF3 +/-

PF4 +

PF5 -

  • HHFW and NBI, if Ip ramp-up were successful
  • Diagnostics adjusted for start-up plasmas at low Ip and ne