Use of a zero-dimensional RFP model to simulate behavior of CPRF and ZT-40M: Annual progress report

Technical Report · Sun Oct 30 04:00:00 EST 1988

OSTI ID:7080520

Klevans, E H

An improved zero-dimensional code has been developed and used for comparison with ZT-40M and for parametric studies of the behavior of ZT-H. The code includes equations for energy balance for electrons and ions. Particle density and current are specified quantities. Impurities are treated using a coronal non-equilibrium model. Particle leakage and recycling are included for plasma and impurities. A single particle lifetime is used. The energy confinement times for electrons and ions are specified as multiplicative coefficients times the Ohmic energy confinement time. Energy loss by electrons is assumed to dominate. Ohmic heating is enhanced by an anomaly factor, and an ion heating term is included by use of a multiplicative factor times Ohmic heating. A single set of coefficients is found to simulate a variety of ZT-40M runs with different currents and wall conditions. Both flat top and ramp current waveforms are studied. The resulting model is applied to predict ZT-H behavior for both 2 MA and 4 MA operation. Parametric analysis was performed to evaluate the effect to varying I/N from 3 x 10/sup -14/ to 6 x 10/sup -14/; of varying the recycle time from 5 ms to 1000 ms; and of using two different energy confinement laws, one involving ..beta../sub theta/ as a calculated parameter, and one for ..beta../sub theta/ = 0.10. Low temperatures were obtained for short recycle times and low I/N values. Significantly improved performance was found for the ..beta../sub theta/ = 0.10 case. 4 figs., 9 tabs.

• Research Organization: Pennsylvania State Univ., University Park (USA)
• DOE Contract Number: FG02-87ER53252
• OSTI ID: 7080520
• Report Number(s): DOE/ER/53252-10; ON: DE89001977
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
700101* -- Fusion Energy-- Plasma Research-- Confinement
Heating
& Production
99 GENERAL AND MISCELLANEOUS
990210 -- Supercomputers-- (1987-1989)
COMPUTERIZED SIMULATION
CONFINEMENT TIME
DOCUMENT TYPES
ELECTRIC HEATING
ELECTRON TEMPERATURE
HEATING
IMPURITIES
ION TEMPERATURE
JOULE HEATING
PINCH EFFECT
PLASMA HEATING
PROGRESS REPORT
RESISTANCE HEATING
REVERSE-FIELD PINCH
SIMULATION
TRANSPORT THEORY
ZT-40 DEVICES