Initial reversed-field pinch experiments on ZT-40 and recent advances in RFP theory Page: 3 of 13
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The ZT-40 reversed-field pinch (RFP) has been operated in several modes;
(1) without reversed toroidal field, (2) with self reversal, ard (3) with aided
reversal. In the RFP mode with fill pressures below 15 mtorr, current
decay times are significantly lengthened over non-reversed field operation.
Temperatures have been obtained up to ~ 70 eV at peak current, well above the
troublesome OVI radiation barrier. Quiet periods, '>0.1 ms, have been observed
in magnetic field and plasma density fluctuations. Recent operation with a
power crowbar overcomes external circuit losses, which limit current decay
times to ~ 0.3 ms with a passive crowbar.
An analycic ohmic heating and ignition model both confirm and provide
guidance for transport codes. Nondissipative formation schemes have been
analyzed and ideal MHD stable evolution and burn scenarios have been found.
Particle and fluid simulations have produced qualitative agreement with respect
to the nonlinear behavior of ra *> 0 resistive g-modes. Helical ohmic reversed
field states are produced by a 2-L) dynamical simulation, and nonlinear analytic
work describes the final sta’-e. A fast resistive MHD code for linear stability
has clarified the relations between several kinds of resistive instabilities.
Ballooning modes and g-modes in systems with arbitrary magnetic shear including
resistivity and viscosity, have been studied in a unified treatment with growth
rate vs wavenumber showing the existence of important cutoffs. Finally, work
on auxiliary heating fur profile control is in progress with both a guiding
center code and a more complete model containing gyroresonar.t effects.
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Baker, D.A.; Buchenauer, C.J. & Burkhardt, L.C. Initial reversed-field pinch experiments on ZT-40 and recent advances in RFP theory, article, January 1, 1980; New Mexico. (digital.library.unt.edu/ark:/67531/metadc1065796/m1/3/: accessed November 21, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.