1
|
Orain F, Bécoulet M, Huijsmans GTA, Dif-Pradalier G, Hoelzl M, Morales J, Garbet X, Nardon E, Pamela S, Passeron C, Latu G, Fil A, Cahyna P. Resistive reduced MHD modeling of multi-edge-localized-mode cycles in Tokamak X-point plasmas. Phys Rev Lett 2015; 114:035001. [PMID: 25659004 DOI: 10.1103/physrevlett.114.035001] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/13/2014] [Indexed: 06/04/2023]
Abstract
The full dynamics of a multi-edge-localized-mode (ELM) cycle is modeled for the first time in realistic tokamak X-point geometry with the nonlinear reduced MHD code jorek. The diamagnetic rotation is found to be instrumental to stabilize the plasma after an ELM crash and to model the cyclic reconstruction and collapse of the plasma pressure profile. ELM relaxations are cyclically initiated each time the pedestal gradient crosses a triggering threshold. Diamagnetic drifts are also found to yield a near-symmetric ELM power deposition on the inner and outer divertor target plates, consistent with experimental measurements.
Collapse
Affiliation(s)
- F Orain
- CEA-IRFM, Cadarache, 13108 Saint-Paul-Lez-Durance, France
| | - M Bécoulet
- CEA-IRFM, Cadarache, 13108 Saint-Paul-Lez-Durance, France
| | - G T A Huijsmans
- ITER Organization, Route de Vinon-sur-Verdon, CS 90 046, 13067 Saint-Paul-Lez-Durance, France
| | | | - M Hoelzl
- Max Planck Institute for Plasma Physics, Boltzmannstr. 2, 85748 Garching, Germany
| | - J Morales
- CEA-IRFM, Cadarache, 13108 Saint-Paul-Lez-Durance, France
| | - X Garbet
- CEA-IRFM, Cadarache, 13108 Saint-Paul-Lez-Durance, France
| | - E Nardon
- CEA-IRFM, Cadarache, 13108 Saint-Paul-Lez-Durance, France
| | - S Pamela
- CCFE, Culham Science Centre, Oxon, Abingdon, Oxfordshire OX14 3DB, United Kingdom
| | - C Passeron
- CEA-IRFM, Cadarache, 13108 Saint-Paul-Lez-Durance, France
| | - G Latu
- CEA-IRFM, Cadarache, 13108 Saint-Paul-Lez-Durance, France
| | - A Fil
- CEA-IRFM, Cadarache, 13108 Saint-Paul-Lez-Durance, France
| | - P Cahyna
- Institute of Plasma Physics ASCR, Za Slovankou 1782/3, 182 00 Prague 8, Czech Republic
| |
Collapse
|
2
|
Bécoulet M, Orain F, Huijsmans GTA, Pamela S, Cahyna P, Hoelzl M, Garbet X, Franck E, Sonnendrücker E, Dif-Pradalier G, Passeron C, Latu G, Morales J, Nardon E, Fil A, Nkonga B, Ratnani A, Grandgirard V. Mechanism of edge localized mode mitigation by resonant magnetic perturbations. Phys Rev Lett 2014; 113:115001. [PMID: 25259985 DOI: 10.1103/physrevlett.113.115001] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/11/2014] [Indexed: 06/03/2023]
Abstract
A possible mechanism of edge localized modes (ELMs) mitigation by resonant magnetic perturbations (RMPs) is proposed based on the results of nonlinear resistive magnetohydrodynamic modeling using the jorek code, realistic JET-like plasma parameters and an RMP spectrum of JET error-field correction coils (EFCC) with a main toroidal number n=2 were used in the simulations. Without RMPs, a large ELM relaxation is obtained mainly due to the most unstable medium-n ballooning mode. The externally imposed RMP drives nonlinearly the modes coupled to n=2 RMP which produce small multimode relaxations, mitigated ELMs. The modes driven by RMPs exhibit a tearinglike structure and produce additional islands. Mitigated ELMs deposit energy into the divertor mainly in the structures ("footprints") created by n=2 RMPs, however, slightly modulated by other nonlinearly driven even harmonics. The divertor power flux during a ELM phase mitigated by RMPs is reduced almost by a factor of 10. The mechanism of ELM mitigation by RMPs proposed here reproduces generic features of high collisionality RMP experiments, where large ELMs are replaced by small, much more frequent ELMs or magnetic turbulence. Total ELM suppression was also demonstrated in modeling at higher RMP amplitude.
Collapse
Affiliation(s)
- M Bécoulet
- CEA, IRFM, 13108 Saint-Paul-Lez-Durance, France
| | - F Orain
- CEA, IRFM, 13108 Saint-Paul-Lez-Durance, France
| | - G T A Huijsmans
- ITER Organization, Route de Vinon-sur-Verdon, 13067 Saint-Paul-Lez-Durance, France
| | - S Pamela
- CCFE, Culham Science Centre, Oxon OX14 3DB, United Kingdom
| | - P Cahyna
- Institute of Plasma Physics ASCR, 182 00 Prague 8, Czech Republic
| | - M Hoelzl
- Max-Planck-Institut, 85748 Garching, Germany
| | - X Garbet
- CEA, IRFM, 13108 Saint-Paul-Lez-Durance, France
| | - E Franck
- Max-Planck-Institut, 85748 Garching, Germany
| | | | | | - C Passeron
- CEA, IRFM, 13108 Saint-Paul-Lez-Durance, France
| | - G Latu
- CEA, IRFM, 13108 Saint-Paul-Lez-Durance, France
| | - J Morales
- CEA, IRFM, 13108 Saint-Paul-Lez-Durance, France
| | - E Nardon
- CEA, IRFM, 13108 Saint-Paul-Lez-Durance, France
| | - A Fil
- CEA, IRFM, 13108 Saint-Paul-Lez-Durance, France
| | - B Nkonga
- Laboratoire de Mathématiques J.A. Dieudonné, UMR 7351, CNRS UNS, Université de Nice-Sophia Antipolis, Parc Valrose, 06108 Nice Cedex 02, France
| | - A Ratnani
- Laboratoire de Mathématiques J.A. Dieudonné, UMR 7351, CNRS UNS, Université de Nice-Sophia Antipolis, Parc Valrose, 06108 Nice Cedex 02, France
| | | |
Collapse
|