Gas jet disruption mitigation studies on Alcator C-Mod and DIII-D
High-pressure noble gas jet injection is a mitigation technique which potentially satisfies the requirements of fast response time and reliability, without degrading subsequent discharges. Previously reported gas jet experiments on DIII-D showed good success at reducing deleterious disruption effect...
| Main Authors: | , , , , , , , , , , , , , , , , , , , , , , , , , , |
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| Format: | Article |
| Language: | en_US |
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Institute of Physics Publishing
2010
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| Online Access: | http://hdl.handle.net/1721.1/55962 https://orcid.org/0000-0001-7456-3509 |
| _version_ | 1826200172206489600 |
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| author | Hollmann, E. M. Whyte, D. G. Antar, G. Y. Bakhtiari, M. Boedo, J. A. Evans, T. E. Jernigan, T. C. Gray, D. S. Groth, M. Humphreys, D. A. Lasnier, C. J. Moyer, R. A. Parks, P. B Rudakov, D. L. Strait, E. J. Wesley, J. West, W. P. Wurden, G. Yu, J. Granetz, Robert S. Izzo, Viviana A. Bader, Aaron Craig Biewer, T. Hutchinson, Ian H. Reinke, Matthew Logan Terry, James L Hutchinson, Ian Horner |
| author2 | Massachusetts Institute of Technology. Department of Nuclear Science and Engineering |
| author_facet | Massachusetts Institute of Technology. Department of Nuclear Science and Engineering Hollmann, E. M. Whyte, D. G. Antar, G. Y. Bakhtiari, M. Boedo, J. A. Evans, T. E. Jernigan, T. C. Gray, D. S. Groth, M. Humphreys, D. A. Lasnier, C. J. Moyer, R. A. Parks, P. B Rudakov, D. L. Strait, E. J. Wesley, J. West, W. P. Wurden, G. Yu, J. Granetz, Robert S. Izzo, Viviana A. Bader, Aaron Craig Biewer, T. Hutchinson, Ian H. Reinke, Matthew Logan Terry, James L Hutchinson, Ian Horner |
| author_sort | Hollmann, E. M. |
| collection | MIT |
| description | High-pressure noble gas jet injection is a mitigation technique which potentially satisfies the requirements of fast response time and reliability, without degrading subsequent discharges. Previously reported gas jet experiments on DIII-D showed good success at reducing deleterious disruption effects. In this paper, results of recent gas jet disruption mitigation experiments on Alcator C-Mod and DIII-D are reported. Jointly, these experiments have greatly improved the understanding of gas jet dynamics and the processes involved in mitigating disruption effects. In both machines, the sequence of events following gas injection is observed to be quite similar: the jet neutrals stop near the plasma edge, the edge temperature collapses and large MHD modes are quickly destabilized, mixing the hot plasma core with the edge impurity ions and radiating away the plasma thermal energy. High radiated power fractions are achieved, thus reducing the conducted heat loads to the chamber walls and divertor. A significant (2 × or more) reduction in halo current is also observed. Runaway electron generation is small or absent. These similar results in two quite different tokamaks are encouraging for the applicability of this disruption mitigation technique to ITER. |
| first_indexed | 2024-09-23T11:32:16Z |
| format | Article |
| id | mit-1721.1/55962 |
| institution | Massachusetts Institute of Technology |
| language | en_US |
| last_indexed | 2024-09-23T11:32:16Z |
| publishDate | 2010 |
| publisher | Institute of Physics Publishing |
| record_format | dspace |
| spelling | mit-1721.1/559622023-02-26T02:51:41Z Gas jet disruption mitigation studies on Alcator C-Mod and DIII-D Hollmann, E. M. Whyte, D. G. Antar, G. Y. Bakhtiari, M. Boedo, J. A. Evans, T. E. Jernigan, T. C. Gray, D. S. Groth, M. Humphreys, D. A. Lasnier, C. J. Moyer, R. A. Parks, P. B Rudakov, D. L. Strait, E. J. Wesley, J. West, W. P. Wurden, G. Yu, J. Granetz, Robert S. Izzo, Viviana A. Bader, Aaron Craig Biewer, T. Hutchinson, Ian H. Reinke, Matthew Logan Terry, James L Hutchinson, Ian Horner Massachusetts Institute of Technology. Department of Nuclear Science and Engineering Massachusetts Institute of Technology. Plasma Science and Fusion Center Hutchinson, Ian H. Granetz, Robert S. Izzo, Viviana A. Bader, Aaron Craig Biewer, T. Hutchinson, Ian H. Reinke, Matthew Logan Terry, James L. High-pressure noble gas jet injection is a mitigation technique which potentially satisfies the requirements of fast response time and reliability, without degrading subsequent discharges. Previously reported gas jet experiments on DIII-D showed good success at reducing deleterious disruption effects. In this paper, results of recent gas jet disruption mitigation experiments on Alcator C-Mod and DIII-D are reported. Jointly, these experiments have greatly improved the understanding of gas jet dynamics and the processes involved in mitigating disruption effects. In both machines, the sequence of events following gas injection is observed to be quite similar: the jet neutrals stop near the plasma edge, the edge temperature collapses and large MHD modes are quickly destabilized, mixing the hot plasma core with the edge impurity ions and radiating away the plasma thermal energy. High radiated power fractions are achieved, thus reducing the conducted heat loads to the chamber walls and divertor. A significant (2 × or more) reduction in halo current is also observed. Runaway electron generation is small or absent. These similar results in two quite different tokamaks are encouraging for the applicability of this disruption mitigation technique to ITER. United States. Dept. of Energy (Coop. Agreements DE-FC02-99ER54512 and DE-FC02-04ER54698, Grants DE-FG02-04ER54758 and DE-FG02-04ER54762, and Contracts DE-AC05-00OR22725, W-7405-ENG-48, and W-7405-ENG-36) 2010-06-25T14:55:00Z 2010-06-25T14:55:00Z 2007-08 2007-06 Article http://purl.org/eprint/type/SubmittedJournalArticle 0029-5515 1741-4326 http://hdl.handle.net/1721.1/55962 R.S. Granetz et al 2007 Nucl. Fusion 47 1086 doi: 10.1088/0029-5515/47/9/003 © IOP Publishing 2007 https://orcid.org/0000-0001-7456-3509 en_US http://dx.doi.org/10.1088/0029-5515/47/9/003 Nuclear Fusion Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use. application/pdf Institute of Physics Publishing Assistant to Ian Hutchinson |
| spellingShingle | Hollmann, E. M. Whyte, D. G. Antar, G. Y. Bakhtiari, M. Boedo, J. A. Evans, T. E. Jernigan, T. C. Gray, D. S. Groth, M. Humphreys, D. A. Lasnier, C. J. Moyer, R. A. Parks, P. B Rudakov, D. L. Strait, E. J. Wesley, J. West, W. P. Wurden, G. Yu, J. Granetz, Robert S. Izzo, Viviana A. Bader, Aaron Craig Biewer, T. Hutchinson, Ian H. Reinke, Matthew Logan Terry, James L Hutchinson, Ian Horner Gas jet disruption mitigation studies on Alcator C-Mod and DIII-D |
| title | Gas jet disruption mitigation studies on Alcator C-Mod and DIII-D |
| title_full | Gas jet disruption mitigation studies on Alcator C-Mod and DIII-D |
| title_fullStr | Gas jet disruption mitigation studies on Alcator C-Mod and DIII-D |
| title_full_unstemmed | Gas jet disruption mitigation studies on Alcator C-Mod and DIII-D |
| title_short | Gas jet disruption mitigation studies on Alcator C-Mod and DIII-D |
| title_sort | gas jet disruption mitigation studies on alcator c mod and diii d |
| url | http://hdl.handle.net/1721.1/55962 https://orcid.org/0000-0001-7456-3509 |
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