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Title: Electromagnetic simulations of JET ICRF ITER-like antenna with TOPICA and SSWICH asymptotic codes

Journal Article · · EPJ Web of Conferences (Online)
 [1];  [2];  [3];  [4];  [1];  [4];  [5];  [2]; ORCiD logo [6];  [7]
  1. Royal Military Academy, Brussels (Belgium)
  2. Max Planck Inst. fur Plasmaphysik, Garching (Germany)
  3. Alternative Energies and Atomic Energy Commission (CEA), Cadarache (France)
  4. Royal Military Academy, Brussels (Belgium); CCFE, Oxfordshire (United Kingdom)
  5. CCFE, Oxfordshire (United Kingdom)
  6. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  7. Politecnico di Torino (Italy)
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Multi-megawatt Ion Cyclotron Range of Frequencies (ICRF) heating is routinely used in the JET tokamak. To increase the ICRF heating power available from the A2 antennas, the ICRF ITER-Like Antenna (ILA) was reinstalled for the 2015 JET ITER-like wall experimental campaign. The application of high levels of ICRF power typically results in increased plasma wall interaction which leads to the observation of enhanced influx of metallic impurities in the plasma edge. It is assumed that the impurity production is mainly driven by the parallel component of the Radio-Frequency (RF) antenna electric near-field, E// (parallel to the confinement magnetic field of the tokamak), that is rectified in a thin boundary layer (RF sheath). Torino Polytechnic Ion Cyclotron Antenna (TOPICA) code was used to compute E// field maps in front of the ILA and between its poloidal limiters in the presence of plasma using measured density profiles and various antenna feedings. E// field maps calculated between the poloidal limiters were used to estimate the poloidal distribution of RF-sheath Direct Current (DC) potential in this private region of the ILA and make relative comparison of various antenna electrical settings. For this purpose we used the asymptotic version of the Self-consistent Sheaths and Waves for Ion Cyclotron Heating Slow-Wave (SSWICH-SW) code. These estimations can help to study the formation of RF sheaths around the antenna and even at distant locations (~3m away).

Research Organization:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Organization:
USDOE
Grant/Contract Number:
AC05-00OR22725; 633053
OSTI ID:
1648984
Journal Information:
EPJ Web of Conferences (Online), Vol. 157, Issue 1; ISSN 2100-014X
Publisher:
EDP SciencesCopyright Statement
Country of Publication:
United States
Language:
English

References (6)

Impurity production from the ion cyclotron resonance heating antennas in JET journal June 2012
Physics and engineering results obtained with the ion cyclotron range of frequencies ITER-like antenna on JET journal June 2012
RF current distribution and topology of RF sheath potentials in front of ICRF antennae journal July 2005
Self consistent radio-frequency wave propagation and peripheral direct current plasma biasing: Simplified three dimensional non-linear treatment in the “wide sheath” asymptotic regime journal September 2012
TOPICA: an accurate and efficient numerical tool for analysis and design of ICRF antennas journal June 2006
Main design features and challenges of the ITER-like ICRF antenna for JET journal November 2005

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Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY