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Spectra of magnetic perturbations triggered by pellets in JET plasmas
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Poli, F. M. (Francesca), Lang, P. T., Sharapov, S. E. (Sergei E.) and Koslowski, H. R. (2010) Spectra of magnetic perturbations triggered by pellets in JET plasmas. Nuclear Fusion, Vol.50 (No.2). p. 5004. doi:10.1088/0029-5515/50/2/025004
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Official URL: http://dx.doi.org/10.1088/0029-5515/50/2/025004
Abstract
Aiming at investigating edge localised mode (ELM) pacing for future application on ITER, experiments have been conducted on JET injecting pellets in different plasma configurations, including high confinement regimes with type-I and type-III ELMs, low confinement regimes and Ohmically heated plasmas. The magnetic perturbations spectra and the toroidal mode number, n, of triggered events are compared with those of spontaneous ELMs using a wavelet analysis to provide good time resolution of short-lived coherent modes. It is found that—in all these configurations—triggered events have a coherent mode structure, indicating that pellets can trigger an MHD event basically in every background plasma. Two components have been found in the magnetic perturbations induced by pellets, with distinct frequencies and toroidal mode numbers. In high confinement regimes triggered events have similarities with spontaneous ELMs: both are seen to start from low toroidal mode numbers, then the maximum measured n increases up to about 10 within 0.3 ms before the ELM burst.
| Item Type: | Journal Article | ||||
|---|---|---|---|---|---|
| Subjects: | Q Science > QC Physics | ||||
| Divisions: | Faculty of Science > Physics | ||||
| Library of Congress Subject Headings (LCSH): | Plasma jets -- Research, Wavelets (Mathematics), Toroidal magnetic circuits, Plasma confinement devices, Tokamaks | ||||
| Journal or Publication Title: | Nuclear Fusion | ||||
| Publisher: | Institute of Physics Publishing Ltd. | ||||
| ISSN: | 0029-5515 | ||||
| Official Date: | 15 January 2010 | ||||
| Dates: |
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| Volume: | Vol.50 | ||||
| Number: | No.2 | ||||
| Page Range: | p. 5004 | ||||
| DOI: | 10.1088/0029-5515/50/2/025004 | ||||
| Status: | Peer Reviewed | ||||
| Access rights to Published version: | Open Access | ||||
| Funder: | Engineering and Physical Sciences Research Council (EPSRC) |
Data sourced from Thomson Reuters' Web of Knowledge
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