Turbulent fluctuations in the main core of TFTR plasmas with negative magnetic shear Page: 3 of 9
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MAZZUCATO et al.
1i .0 (a)
10 - -T (0)
02.4 2.5 2.6 2.7 . 2.8 2.9 3.0
4 time s
3 ( (d) 6
1.5 2.0 2.5 3.0 3.50 0.2 0.4 0.6 0.8 1.0
FIG. 1. lime evolution of central electron density (a) and of temperatures (b) in ERS (solid line) and
RS (dashed line) plasmas with 29 and 27 MW of balanced NBI, respectively. The bottom graphs show
the radial profile of the plasma pressure (c) at t=2.9 s and the safety factor (d) at the bifurcation time.
0.1 0.2 0.3
0.4 0.5 0.6
FIG. 2. Ion thermal conductivity (xd and electron particle diffusivity (D,) in the ERS (solid line) and
RS (dashed line) plasmas of Fig. 1 (t=2.75 s).
a =0.94 m, a toroidal magnetic field B =4.6 T, and a plasma current I =1.6 MA.
The central plasma region with negative shear is created early in the discharge by a
combination of heating and current drive. Under intense auxiliary heating with neutral
beam injection (NBI), these plasmas are observed to bifurcate into two different states
[3), the reversed shear (RS) and the enhanced reversed shear (ERS) mode (Fig. 1).
While the RS mode is similar to the supershot regime which is normally observed in
TFTR with monotonic q-profiles, the ERS mode is characterized by highly peaked
P I - -
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Mazzucato, E.; Beer, M. A.; Bell, M. G. & Batha, S. H. Turbulent fluctuations in the main core of TFTR plasmas with negative magnetic shear, article, September 1997; Princeton, New Jersey. (digital.library.unt.edu/ark:/67531/metadc694329/m1/3/: accessed December 16, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.