Spitzer or neoclassical resistivity: A comparison between measured and model poloidal field profiles on PBX-M
- Princeton Univ., NJ (United States). Plasma Physics Lab.
- Fusion Physics and Technologies, Torrance, CA (United States)
Direct measurements of the radial profile of the magnetic field line pitch on PBX-M coupled with model predictions of these profiles allow a critical comparison with the Spitzer and neoclassical models of plasma parallel resistivity. The measurements of the magnetic field line pitch are made by Motional Stark Effect polarimetry, while the model profiles are determined by solving the poloidal field diffusion equation in the TRANSP transport code using measured plasma profiles and assuming either Spitzer or neoclassical resistivity. The measured field pitch profiles were available for only seven cases, and the model profiles were distinguishable from each other in only three of those cases due to finite resistive diffusion times. The data in two of these three were best matched by the Spitzer model, especially in the inner half of the plasma. Portions of the measured pitch profiles for these two cases and the full profiles for other cases, however, departed significantly from both the Spitzer and neoclassical models, indicating a plasma resistivity profile different from either model.
- Research Organization:
- Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
- Sponsoring Organization:
- USDOE; USDOE, Washington, DC (United States)
- DOE Contract Number:
- AC02-76CH03073
- OSTI ID:
- 5871797
- Report Number(s):
- PPPL-2807; ON: DE92006818
- Country of Publication:
- United States
- Language:
- English
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Spitzer or neoclassical resistivity: A comparison between measured and model poloidal field profiles on PBX-M
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Related Subjects
COMPACT IGNITION TOKAMAK
MAGNETIC FIELDS
DIFFUSION
ELECTRIC CONDUCTIVITY
NEOCLASSICAL TRANSPORT THEORY
PLASMA DIAGNOSTICS
POLARIMETRY
TEMPERATURE DISTRIBUTION
CLOSED PLASMA DEVICES
ELECTRICAL PROPERTIES
PHYSICAL PROPERTIES
THERMONUCLEAR DEVICES
THERMONUCLEAR REACTORS
TOKAMAK DEVICES
TOKAMAK TYPE REACTORS
TRANSPORT THEORY
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