Heat pulse propagation studies in TFTR

Technical Report · Sat Feb 01 00:00:00 EST 1986

DOI:https://doi.org/10.2172/6046381· OSTI ID:6046381

Fredrickson, E D; Callen, J D; Colchin, R J; Efthimion, P C; Hill, K W; Izzo, R; Mikkelsen, D R; Monticello, D A; McGuire, K; Bell, J D

The time scales for sawtooth repetition and heat pulse propagation are much longer (10's of msec) in the large tokamak TFTR than in previous, smaller tokamaks. This extended time scale coupled with more detailed diagnostics has led us to revisit the analysis of the heat pulse propagation as a method to determine the electron heat diffusivity, chi/sub e/, in the plasma. A combination of analytic and computer solutions of the electron heat diffusion equation are used to clarify previous work and develop new methods for determining chi/sub e/. Direct comparison of the predicted heat pulses with soft x-ray and ECE data indicates that the space-time evolution is diffusive. However, the chi/sub e/ determined from heat pulse propagation usually exceeds that determined from background plasma power balance considerations by a factor ranging from 2 to 10. Some hypotheses for resolving this discrepancy are discussed. 11 refs., 19 figs., 1 tab.

• Research Organization: Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
• DOE Contract Number: AC02-76CH03073
• OSTI ID: 6046381
• Report Number(s): PPPL-2255; ON: DE86007532
• Resource Relation: Other Information: Portions of this document are illegible in microfiche products. Original copy available until stock is exhausted
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
TFTR TOKAMAK
THERMAL DIFFUSION
ANALYTICAL SOLUTION
ELECTRONS
ENERGY LOSSES
HEAT TRANSFER
NUMERICAL SOLUTION
PLASMA DIAGNOSTICS
SCALING LAWS
SOFT X RADIATION
SPACE-TIME MODEL
CLUSTER EMISSION MODEL
DIFFUSION
ELECTROMAGNETIC RADIATION
ELEMENTARY PARTICLES
ENERGY TRANSFER
FERMIONS
IONIZING RADIATIONS
LEPTONS
LOSSES
MATHEMATICAL MODELS
MULTIPERIPHERAL MODEL
PARTICLE MODELS
PERIPHERAL MODELS
RADIATIONS
THERMONUCLEAR REACTORS
TOKAMAK TYPE REACTORS
X RADIATION
700101* - Fusion Energy- Plasma Research- Confinement
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