US tokamak research Page: 4 of 13
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’d" cans
TQRQlQAL COIL 3
- .J:
PLASMA J J
. POLOIOAL
r COILS
i.NNER TORQUE
OUTER TORQUE
RESTRAINT
SCALE icm)
5-A:va '.’a. v.v
• •- : r, ; it
* . A
1. 5chemstic of the 15X-3
js it "FIJI.
Fig-Lire 2. Central £-values obtained
by neutral-beam heating m I5X-3.
The contributions due to tne plasma
pressure and the beam-ion pressure
are iis tmguished.
The central values achieved at various beam-power levels and plasma
ier.sities are shewn in Fig. 2. In the lower-density cases# an appreciable
fraction of the central i-value is seen to be contributed by the energetic
injected ‘.cns, rather than by the bulk plasma. At higher plasma densities
-•od for space-averaged 3-values, the pressure contribution of the energetic
- articles is miner.
The dependence of the quantity 3* = 3"((?“)}*/“/3^ on beam power and
lets icy is ... howr. in Tig. 3. There is no evidence of saturation at the high-
est power levels used thus far. Correspondingly, no deterioration of
has been observed at the highest 3-values - The pattern of MHD activity under-
goes some rather marked changes during neutral-beam heating, but these phe-
nomena could well be caused by the injection process itself, rather than by
the £-level. In particular, since injection is unidirectional, one would
expect plasma rotation (cf. Section IV j to shift the MHD mode frequencies,
and guite probably to drive new kinds of MHD modes. As one contemplates the
pcssibilities, it becomes clear that the onset of the true ballooning mcca
3-limit may be rather difficult to identify uniquely, unless some variation
can be introduced in the plasma heating method.
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Furth, H.P. US tokamak research, article, October 1, 1979; New Jersey. (https://digital.library.unt.edu/ark:/67531/metadc1098234/m1/4/?rotate=270: accessed July 16, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.