Modeling study of energy balance in the ZT-40M reversed-field pinch: low-current passive crowbar operation
Technical Report
·
OSTI ID:5980052
The energy confinement time corresponding to a Reversed-Field Pinch in low-current passive crowbar operation is considered. Assuming classical ohmic heating, we derive a formula from an analytic power balance study, and this is compared with the values calculated from a 1D atomic physics transport code that incorporates various tokamak scaling laws for energy confinement. By constraining the code to reproduce the experimental results from the ZT-40M device, we find that the values of the energy confinement time calculated by the code generally agree with those predicted by the formula and indicate a confinement time approximately 0.1 ms for the considered set of experiments. The power balance study also compares the RFP and the tokamak. The energy confinement time for the RFP is found to be substantially smaller than that for the tokamak when values of minor radius, current, and density are similar, by virtue of the smaller value of poloidal beta in the RFP. The numerical results do not suggest that any particular one of the tokamak scaling laws is best suited to describing the RFP behavior.
- Research Organization:
- Los Alamos National Lab., NM (USA)
- DOE Contract Number:
- W-7405-ENG-36
- OSTI ID:
- 5980052
- Report Number(s):
- LA-9668-MS; ON: DE83013226
- Country of Publication:
- United States
- Language:
- English
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