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Device Parameters of Heliotron J
Coil SystemL=1/M=4 helical coil 0.96MATToroidal coil A 0.6MATToroidal coil B 0.218MATMain vertical coil 0.84MATInner vertical coil 0.48MAT
Major radius 1.2mMinor radius of helical coil 0.28mVacuum chamber 2.1m3
Aspect ratio 7Port 65Magnetic Field 1.5TPulse length 0.5secPitch modulation of helical coil
Inner Vertical Coil
Toroidal Coil A
Outer Vertical Coil
Toroidal Coil BHelical Coil
Plasma
Vacuum Chamber
sin( )
0.4
M M
L L
The Heliotron J Device
Main VFC
TFC-A
TFC-B
Aux.VFC
HFC
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
Heliotron-J surfaces: cfg “A” - helical divertor
Magnetic Surface Mapping
Fig.3 The magnetic surfaces at = 67.5 in the standard configuration. (a) The experimental results (corrected) and (b) The calculated magnetic surfaces.
(a) (b)
STD config, 0.03 Tesla, corrected for earth’s field
Electron Cyclotron Heating
• ECH 400kW 53GHZ 50ms
• <> ~ 0.2%, <20% radiated
• some Fe Ti C O impurities
Plans:
• will upgrade to 70GHz, 500kW
• ultimately 4MW ~20kJ?
• impurity control
• explore bumpiness and hel. divertorsFig. 2 Dependence of the diamagnetic stored energy on the magnetic field strength.
B*=0 (T)
Wp (kJ)
#1595 ~ #241653.2GHz ECH
0/
0.80 1.00 1.20 1.400
0.2
0.4
0.6
0.8
1
0.4 0.5 0.6 0.7
W-Diamagnetic vs B is peaked, 700J max