Monte Carlo simulation of ICRF discharge initiation in ITER

M. Tripský; T. Wauters; A. Lyssoivan; A. Krivská; F. Louche; M. Van Schoor; J. M. Noterdaeme

doi:10.1063/1.4936507

Monte Carlo simulation of ICRF discharge initiation in ITER

M. Tripský, T. Wauters, A. Lyssoivan, A. Krivská, F. Louche, M. Van Schoor, J. M. Noterdaeme

University of Ghent

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution › peer-review

Abstract

Discharges produced and sustained by ion cyclotron range of frequency (ICRF) waves in absence of plasma current will be used on ITER for (ion cyclotron-) wall conditioning (ICWC). The here presented simulations aim at ensuring that the ITER ICRH&CD system can be safely employed for ICWC and at finding optimal parameters to initiate the plasma. The 1D Monte Carlo code RFdinity1D3V was developed to simulate ICRF discharge initiation. The code traces the electron motion along one toroidal magnetic field line, accelerated by the RF field in front of the ICRF antenna. Electron collisions in the calculations are handled by a Monte Carlo procedure taking into account their energies and the related electron collision cross sections for collisions with H₂, H₂⁺ and H⁺. The code also includes Coulomb collisions between electrons and ions (e - e,e - H₂⁺,e - H⁺). We study the electron multiplication rate as a function of the RF discharge parameters (i) antenna input power (0.1-5MW), and (ii) the neutral pressure (H₂) for two antenna phasing (monopole [0000]-phasing and small dipole [0ππ]-phasing). Furthermore, we investigate the electron multiplication rate dependency on the distance from the antenna straps. This radial dependency results from the decreasing electric amplitude and field smoothening with increasing distance from the antenna straps. The numerical plasma breakdown definition used in the code corresponds to the moment when a critical electron density n_ec for the low hybrid resonance (ς) = ςLHR) is reached. This numerical definition was previously found in qualitative agreement with experimental breakdown times obtained from the literature and from experiments on the ASDEX Upgrade and TEXTOR.

Original language	English
Title of host publication	Radio Frequency Power in Plasmas
Subtitle of host publication	Proceedings of the 21St Topical Conference
Editors	Robert I. Pinsker
Publisher	American Institute of Physics Inc.
ISBN (Electronic)	9780735413368
DOIs	https://doi.org/10.1063/1.4936507
Publication status	Published - 10 Dec 2015
Event	21st Topical Conference on Radiofrequency Power in Plasmas - Lake Arrowhead, United States Duration: 27 Apr 2015 → 29 Apr 2015

Publication series

Name	AIP Conference Proceedings
Volume	1689
ISSN (Print)	0094-243X
ISSN (Electronic)	1551-7616

Conference

Conference	21st Topical Conference on Radiofrequency Power in Plasmas
Country/Territory	United States
City	Lake Arrowhead
Period	27/04/15 → 29/04/15

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10.1063/1.4936507

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Tripský, M., Wauters, T., Lyssoivan, A., Krivská, A., Louche, F., Van Schoor, M., & Noterdaeme, J. M. (2015). Monte Carlo simulation of ICRF discharge initiation in ITER. In R. I. Pinsker (Ed.), Radio Frequency Power in Plasmas: Proceedings of the 21St Topical Conference Article 060009 (AIP Conference Proceedings; Vol. 1689). American Institute of Physics Inc.. https://doi.org/10.1063/1.4936507

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title = "Monte Carlo simulation of ICRF discharge initiation in ITER",

abstract = "Discharges produced and sustained by ion cyclotron range of frequency (ICRF) waves in absence of plasma current will be used on ITER for (ion cyclotron-) wall conditioning (ICWC). The here presented simulations aim at ensuring that the ITER ICRH&CD system can be safely employed for ICWC and at finding optimal parameters to initiate the plasma. The 1D Monte Carlo code RFdinity1D3V was developed to simulate ICRF discharge initiation. The code traces the electron motion along one toroidal magnetic field line, accelerated by the RF field in front of the ICRF antenna. Electron collisions in the calculations are handled by a Monte Carlo procedure taking into account their energies and the related electron collision cross sections for collisions with H2, H2+ and H+. The code also includes Coulomb collisions between electrons and ions (e - e,e - H2+,e - H+). We study the electron multiplication rate as a function of the RF discharge parameters (i) antenna input power (0.1-5MW), and (ii) the neutral pressure (H2) for two antenna phasing (monopole [0000]-phasing and small dipole [0ππ]-phasing). Furthermore, we investigate the electron multiplication rate dependency on the distance from the antenna straps. This radial dependency results from the decreasing electric amplitude and field smoothening with increasing distance from the antenna straps. The numerical plasma breakdown definition used in the code corresponds to the moment when a critical electron density nec for the low hybrid resonance (ς) = ςLHR) is reached. This numerical definition was previously found in qualitative agreement with experimental breakdown times obtained from the literature and from experiments on the ASDEX Upgrade and TEXTOR.",

author = "M. Tripsk{\'y} and T. Wauters and A. Lyssoivan and A. Krivsk{\'a} and F. Louche and {Van Schoor}, M. and Noterdaeme, {J. M.}",

year = "2015",

month = dec,

day = "10",

doi = "10.1063/1.4936507",

language = "English",

series = "AIP Conference Proceedings",

publisher = "American Institute of Physics Inc.",

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booktitle = "Radio Frequency Power in Plasmas",

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Tripský, M, Wauters, T, Lyssoivan, A, Krivská, A , Louche, F, Van Schoor, M & Noterdaeme, JM 2015, Monte Carlo simulation of ICRF discharge initiation in ITER. in RI Pinsker (ed.), Radio Frequency Power in Plasmas: Proceedings of the 21St Topical Conference., 060009, AIP Conference Proceedings, vol. 1689, American Institute of Physics Inc., 21st Topical Conference on Radiofrequency Power in Plasmas, Lake Arrowhead, United States, 27/04/15. https://doi.org/10.1063/1.4936507

Monte Carlo simulation of ICRF discharge initiation in ITER. / Tripský, M.; Wauters, T.; Lyssoivan, A. et al.
Radio Frequency Power in Plasmas: Proceedings of the 21St Topical Conference. ed. / Robert I. Pinsker. American Institute of Physics Inc., 2015. 060009 (AIP Conference Proceedings; Vol. 1689).

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution › peer-review

TY - GEN

T1 - Monte Carlo simulation of ICRF discharge initiation in ITER

AU - Tripský, M.

AU - Wauters, T.

AU - Lyssoivan, A.

AU - Krivská, A.

AU - Louche, F.

AU - Van Schoor, M.

AU - Noterdaeme, J. M.

PY - 2015/12/10

Y1 - 2015/12/10

N2 - Discharges produced and sustained by ion cyclotron range of frequency (ICRF) waves in absence of plasma current will be used on ITER for (ion cyclotron-) wall conditioning (ICWC). The here presented simulations aim at ensuring that the ITER ICRH&CD system can be safely employed for ICWC and at finding optimal parameters to initiate the plasma. The 1D Monte Carlo code RFdinity1D3V was developed to simulate ICRF discharge initiation. The code traces the electron motion along one toroidal magnetic field line, accelerated by the RF field in front of the ICRF antenna. Electron collisions in the calculations are handled by a Monte Carlo procedure taking into account their energies and the related electron collision cross sections for collisions with H2, H2+ and H+. The code also includes Coulomb collisions between electrons and ions (e - e,e - H2+,e - H+). We study the electron multiplication rate as a function of the RF discharge parameters (i) antenna input power (0.1-5MW), and (ii) the neutral pressure (H2) for two antenna phasing (monopole [0000]-phasing and small dipole [0ππ]-phasing). Furthermore, we investigate the electron multiplication rate dependency on the distance from the antenna straps. This radial dependency results from the decreasing electric amplitude and field smoothening with increasing distance from the antenna straps. The numerical plasma breakdown definition used in the code corresponds to the moment when a critical electron density nec for the low hybrid resonance (ς) = ςLHR) is reached. This numerical definition was previously found in qualitative agreement with experimental breakdown times obtained from the literature and from experiments on the ASDEX Upgrade and TEXTOR.

AB - Discharges produced and sustained by ion cyclotron range of frequency (ICRF) waves in absence of plasma current will be used on ITER for (ion cyclotron-) wall conditioning (ICWC). The here presented simulations aim at ensuring that the ITER ICRH&CD system can be safely employed for ICWC and at finding optimal parameters to initiate the plasma. The 1D Monte Carlo code RFdinity1D3V was developed to simulate ICRF discharge initiation. The code traces the electron motion along one toroidal magnetic field line, accelerated by the RF field in front of the ICRF antenna. Electron collisions in the calculations are handled by a Monte Carlo procedure taking into account their energies and the related electron collision cross sections for collisions with H2, H2+ and H+. The code also includes Coulomb collisions between electrons and ions (e - e,e - H2+,e - H+). We study the electron multiplication rate as a function of the RF discharge parameters (i) antenna input power (0.1-5MW), and (ii) the neutral pressure (H2) for two antenna phasing (monopole [0000]-phasing and small dipole [0ππ]-phasing). Furthermore, we investigate the electron multiplication rate dependency on the distance from the antenna straps. This radial dependency results from the decreasing electric amplitude and field smoothening with increasing distance from the antenna straps. The numerical plasma breakdown definition used in the code corresponds to the moment when a critical electron density nec for the low hybrid resonance (ς) = ςLHR) is reached. This numerical definition was previously found in qualitative agreement with experimental breakdown times obtained from the literature and from experiments on the ASDEX Upgrade and TEXTOR.

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DO - 10.1063/1.4936507

M3 - Conference contribution

AN - SCOPUS:84984586031

T3 - AIP Conference Proceedings

BT - Radio Frequency Power in Plasmas

A2 - Pinsker, Robert I.

PB - American Institute of Physics Inc.

T2 - 21st Topical Conference on Radiofrequency Power in Plasmas

Y2 - 27 April 2015 through 29 April 2015

ER -

Monte Carlo simulation of ICRF discharge initiation in ITER

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