Device Parameters of Heliotron J

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Device Parameters of Heliotron J
Coil System L1/M4 helical coil
0.96MAT Toroidal coil A 0.6MAT Toroidal coil B
0.218MAT Main vertical coil 0.84MAT Inner
vertical coil 0.48MAT Major radius 1.2m Minor
radius of helical coil 0.28m Vacuum
chamber 2.1m3 Aspect ratio 7 Port 65 Magnetic
Field 1.5T Pulse length 0.5sec Pitch modulation
of helical coil
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The Heliotron J Device
TFC-A
TFC-B
HFC
Aux.VFC
Main VFC
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Heliotron-J surfaces cfg A - helical divertor

• Configuration A is designed to create a helical
  divertor region shown in red and yellow.
• The position of the plasma is shown relative to
  the helical conductor and the vacuum vessel
• Other configurations
• island divertor
• standard
• from T. Mizuuchi, M. Nakasuga et al. Stellararor
  Workshop 1999

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Magnetic Surface Mapping
STD config, 0.03 Tesla, corrected for earths
field
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Electron Cyclotron Heating

• ECH 400kW 53GHZ 50ms
• lt?gt 0.2, lt20 radiated
• some Fe Ti C O impuritiesPlans
• will upgrade to 70GHz, 500kW
• ultimately 4MW 20kJ?
• impurity control
• explore bumpiness and hel. divertors

W-Diamagnetic vs B is peaked, 700J max
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The Heliotron J Device
TFC-A
TFC-B
HFC
Aux.VFC
Main VFC