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

Abstract

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 Sheathsmore » 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).« less

Authors:
 [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)
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1648984
Grant/Contract Number:  
AC05-00OR22725; 633053
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
EPJ Web of Conferences
Additional Journal Information:
Journal Volume: 157; Journal Issue: 1; Journal ID: ISSN 2100-014X
Publisher:
EDP Sciences
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY

Citation Formats

Křivská, Alena, Bobkov, Volodymyr, Colas, Laurent, Dumortier, Pierre, Durodié, Frédéric, Lerche, Ernesto, Jacquet, Philippe, Jacquot, Jonathan, Klepper, Christopher, and Milanesio, Daniele. Electromagnetic simulations of JET ICRF ITER-like antenna with TOPICA and SSWICH asymptotic codes. United States: N. p., 2017. Web. doi:10.1051/epjconf/201715703026.
Křivská, Alena, Bobkov, Volodymyr, Colas, Laurent, Dumortier, Pierre, Durodié, Frédéric, Lerche, Ernesto, Jacquet, Philippe, Jacquot, Jonathan, Klepper, Christopher, & Milanesio, Daniele. Electromagnetic simulations of JET ICRF ITER-like antenna with TOPICA and SSWICH asymptotic codes. United States. https://doi.org/10.1051/epjconf/201715703026
Křivská, Alena, Bobkov, Volodymyr, Colas, Laurent, Dumortier, Pierre, Durodié, Frédéric, Lerche, Ernesto, Jacquet, Philippe, Jacquot, Jonathan, Klepper, Christopher, and Milanesio, Daniele. Mon . "Electromagnetic simulations of JET ICRF ITER-like antenna with TOPICA and SSWICH asymptotic codes". United States. https://doi.org/10.1051/epjconf/201715703026. https://www.osti.gov/servlets/purl/1648984.
@article{osti_1648984,
title = {Electromagnetic simulations of JET ICRF ITER-like antenna with TOPICA and SSWICH asymptotic codes},
author = {Křivská, Alena and Bobkov, Volodymyr and Colas, Laurent and Dumortier, Pierre and Durodié, Frédéric and Lerche, Ernesto and Jacquet, Philippe and Jacquot, Jonathan and Klepper, Christopher and Milanesio, Daniele},
abstractNote = {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).},
doi = {10.1051/epjconf/201715703026},
url = {https://www.osti.gov/biblio/1648984}, journal = {EPJ Web of Conferences},
issn = {2100-014X},
number = 1,
volume = 157,
place = {United States},
year = {2017},
month = {10}
}

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Works referenced in this record:

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


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