Kinetic modeling of electron transport in C-Mod and DIII-D tokamaks

Conference · Tue Dec 31 04:00:00 EST 1996

OSTI ID:489555

Sigmar, D J; Batishcheva, A A; LaBombard, B ^[1]

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1. MIT, Cambridge, MA (United States); and others

We present results from a kinetic simulation of parallel electron transport in the scrape-off-layer of C-Mod and DIII-D tokamaks. Modelling is carried out using the 1D2V Fokker-Planck code ALLA. In our model electrons can evolve in the Braginskii electric field and collide with Maxwellian background plasma which is taken to match available experimental measurements and assumed to be frozen. We start with C-Mod detached and attached profiles, obtained from reconstructions of the experimental data using a heat conduction model. We use different plasma profiles and have improved the numerical model used in our previous work. Next we use DIII-D profiles taken from an advanced two-dimensional simulation performed with the fluid code UEDGE. We find significant deviations of the electron distribution function from Maxwellian for both cases. This results in a substantial modification of the heat conduction coefficient and effective plasma and neutrals reaction rates with respect to the equilibrium quantities. We also evaluate how the non-Maxwellian tail of the electron distribution function affects the divertor and reciprocating probe measurements. Finally we present a comparison of non-local features of parallel electron transport in the C-Mod and DIII-D tokamaks.

• DOE Contract Number: FG02-91ER54109; AC02-78ET51013; FG02-88ER53263; W-7405-ENG-48
• OSTI ID: 489555
• Report Number(s): CONF-960354--
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
CHARGED-PARTICLE TRANSPORT
DISTRIBUTION FUNCTIONS
KINETIC EQUATIONS
PLASMA SCRAPE-OFF LAYER
PLASMA SIMULATION
TOKAMAK DEVICES