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Title: Simulations of gas puff effects on edge density and ICRF coupling in ASDEX upgrade using EMC3-Eirene

Simulations were carried out with the 3D plasma transport code EMC3-EIRENE, to study the deuterium gas (D{sub 2}) puff effects on edge density and the coupling of Ion Cyclotron Range of Frequency (ICRF) power in ASDEX Upgrade. Firstly we simulated an inter-ELM phase of an H-mode discharge with a moderate (1.2 × 10{sup 22} electrons/s) lower divertor gas puff. Then we changed the gas source positions to the mid-plane or top of machine while keeping other conditions the same. Cases with different mid-plane or top gas valves are investigated. Our simulations indicate that compared to lower divertor gas puffing, the mid-plane gas puff can enhance the local density in front of the antennas most effectively, while a rather global (toroidally uniform) but significantly smaller enhancement is found for top gas puffing. Our results show quantitative agreement with the experiments.
Authors:
 [1] ;  [2] ;  [3] ; ; ; ;  [4] ;  [1] ;  [2] ;  [5] ;  [6]
  1. Applied Physics Department, University of Ghent, Ghent (Belgium)
  2. (Germany)
  3. (China)
  4. Max-Planck-Institut für Plasmaphysik, Garching (Germany)
  5. CCFE, Culham Science Centre, Abingdon (United Kingdom)
  6. Max-Planck-Institut für Plasmaphysik, Greifswald (Germany)
Publication Date:
OSTI Identifier:
22496199
Resource Type:
Journal Article
Resource Relation:
Journal Name: AIP Conference Proceedings; Journal Volume: 1689; Journal Issue: 1; Conference: 21. topical conference on radio frequency power in plasmas, Lake Arrowhead, CA (United States), 27-29 Apr 2015; Other Information: (c) 2015 EURATOM; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; ANTENNAS; ASDEX TOKAMAK; COMPARATIVE EVALUATIONS; COUPLING; DENSITY; DEUTERIUM; DIVERTORS; E CODES; EDGE LOCALIZED MODES; ELECTRONS; H-MODE PLASMA CONFINEMENT; ICR HEATING; ION CYCLOTRON-RESONANCE; PLASMA; SIMULATION; THREE-DIMENSIONAL CALCULATIONS; VALVES