Kinetic simulation of detachment in a scape-off-layer plasma

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

OSTI ID:489405

Batishchev, O V ^[1]; Byers, J A; Cohen, R H ^[2]

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1. MIT, Cambridge, MA (United States)
2. Lawrence Livermore National Lab., CA (United States); and others

We present results from a 1D2V kinetic simulation of the transition from attached to detached flow in a tokamak scrape-off-layer (SOL) plasma. To model this we use our collisional hybrid PIC code W1. It is known that SOL plasma detachment can be initiated by either dropping the heat flux into the scrape-off-layer or by increasing radiative impurity concentration. Both mechanisms are studied in this work. In the first part of our work we show results from the kinetic modelling of a SOL plasma with Knudsen neutrals for a range of midplane energy fluxes that can produce both detached and attached solutions. The important new feature added to the present model not contained in the previous one is the use of the actual real electron/ion mass ratio. To make this improvement possible a significant modifications of the W1 code was carried out. This code modifications will also be discussed in the work. In the second part of our work we give results from a kinetic simulation of impurity radiation induced SOL plasma detachment. We study this phenomena in more detail and use a more advanced experiment-related model than was implemented in our preceding investigation.

• DOE Contract Number: FG02-91ER54109; FG02-88ER53263; W-7405-ENG-48
• OSTI ID: 489405
• Report Number(s): CONF-960354--
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
FLOW MODELS
KINETIC EQUATIONS
PLASMA FLUID EQUATIONS
PLASMA SCRAPE-OFF LAYER
PLASMA SIMULATION
TOKAMAK DEVICES