UEDGE and DEGAS modeling of the DIII-D scrape-off layer plasma
- Lawrence Livermore National Lab., CA (United States)
- General Atomics, San Diego, CA (United States)
This paper presents the results of work to develop benchmarked theoretical models of scrape-off-layer (SOL) characteristics in diverted tokamaks by comparing shot simulations using the UEDGE plasma fluid and DEGAS Monte-Carlo neutral particle transport codes to measurements of the DIII-D SOL plasma. The available experimental data include the radial profiles of electron density and temperature, the ion temperature, the divertor exhaust power, the intensity of H{sub {alpha}} emission, and profiles of the radiated power. A very simple model of the anomalous perpendicular transport rates produces consistency between the calculated and measured radial profiles of the divertor power, and of the midplane densities and temperatures. Experimentally, measured exhaust power is now typically 80--90% of the input power. The simulated peak power on the outer leg of the divertor floor is now within about 20% of the measured power. Various sensitivities of the simulation and measurement comparisons to model assumptions are described. Finally, these benchmarked models have been used to examine the effects of various baffle configurations for the Radiative Divertor Upgrade in DIII-D.
- Research Organization:
- Lawrence Livermore National Lab., CA (United States); General Atomics, San Diego, CA (United States)
- Sponsoring Organization:
- USDOE, Washington, DC (United States)
- DOE Contract Number:
- W-7405-ENG-48; AC03-89ER51114
- OSTI ID:
- 10196607
- Report Number(s):
- UCRL-JC-115491; CONF-940580-23; ON: DE95003652; 35AT10020/35AT15040
- Resource Relation:
- Conference: 11. international conference on plasma surface interactions in controlled fusion devices,Mito (Japan),23-27 May 1994; Other Information: PBD: May 1994
- Country of Publication:
- United States
- Language:
- English
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