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Title: Overview of the results on divertor heat loads in RMP controlled H-modeplasmas on DIII-D

Abstract

This paper demonstrates the manipulation of power deposition on divertor targets at DIII-D by the application of resonant magnetic perturbations (RMPs) for suppression of large type-I edge localized modes (ELMs) is analysed. We discuss the modification of the ELM characteristics by the RMP applied. It is shown that the width of the deposition pattern in ELMy H-mode depends linearly on the ELM deposited energy, whereas in the RMP phase of the discharge those patterns are controlled by the externally induced magnetic perturbation. It was also found that the manipulation of heat transport due to the application of small, edge RMP depends on the plasma pedestal electron collisionality. We then compare in this analysis RMP and no RMP phases with and without complete ELM suppression. At high , the heat flux during the ELM suppressed phase is of the same order as the inter-ELM and the no-RMP phase. However, below this collisionality value, a slight increase in the total power flux to the divertor is observed during the RMP phase. We surmised that this is most likely caused by a more negative potential at the divertor surface due to hot electrons reaching the divertor surface from the pedestal area along perturbed,more » open field lines.« less

Authors:
 [1];  [2];  [3];  [3];  [3];  [2];  [4];  [5];  [6];  [7];  [8];  [6];  [2];  [8];  [2];  [4];  [2];  [2];  [8];  [2] more »;  [4];  [2];  [2];  [4];  [8];  [4];  [2];  [2];  [4];  [2];  [4];  [9];  [2] « less
  1. Max-Planck-Inst. for Plasmaphysics (Germany); Inst. of Energy Research and Physical Technologies (Germany)
  2. General Atomics, San Diego, CA (United States)
  3. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
  4. Inst. of Energy Research and Physical Technologies (Germany)
  5. Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
  6. Max-Planck-Inst. for Plasmaphysics (Germany)
  7. Culham Science Center, Abingdon (United Kingdom)
  8. Univ. of California, San Diego, CA (United States)
  9. General Atomics, San Diego, CA (United States
Publication Date:
Research Org.:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1237581
Report Number(s):
LLNL-JRNL-410563
Journal ID: ISSN 0029-5515; TRN: US1600615
Grant/Contract Number:  
AC52-07NA27344
Resource Type:
Accepted Manuscript
Journal Name:
Nuclear Fusion
Additional Journal Information:
Journal Volume: 49; Journal ID: ISSN 0029-5515
Publisher:
IOP Science
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION

Citation Formats

Jakubowski, M. W., Evans, T. E., Fenstermacher, M. E., Groth, M., Lasnier, C. J., Leonard, A. W., Schmitz, O., Watkins, J. G., Eich, T., Fundamenski, W., Moyer, R. A., Wolf, R. C., Baylor, L. B., Boedo, J. A., Burrell, K. H., Frerichs, H., deGrassie, J. S., Gohil, P., Joseph, I., Mordijck, S., Lehnen, M., Petty, C. C., Pinsker, R. I., Reiter, D., Rhodes, T. L., Samm, U., Schaffer, M. J., Snyder, P. B., Stoschus, H., Osborne, T., Unterberg, B., Unterberg, E., and West, W. P. Overview of the results on divertor heat loads in RMP controlled H-modeplasmas on DIII-D. United States: N. p., 2009. Web. doi:10.1088/0029-5515/49/9/095013.
Jakubowski, M. W., Evans, T. E., Fenstermacher, M. E., Groth, M., Lasnier, C. J., Leonard, A. W., Schmitz, O., Watkins, J. G., Eich, T., Fundamenski, W., Moyer, R. A., Wolf, R. C., Baylor, L. B., Boedo, J. A., Burrell, K. H., Frerichs, H., deGrassie, J. S., Gohil, P., Joseph, I., Mordijck, S., Lehnen, M., Petty, C. C., Pinsker, R. I., Reiter, D., Rhodes, T. L., Samm, U., Schaffer, M. J., Snyder, P. B., Stoschus, H., Osborne, T., Unterberg, B., Unterberg, E., & West, W. P. Overview of the results on divertor heat loads in RMP controlled H-modeplasmas on DIII-D. United States. doi:10.1088/0029-5515/49/9/095013.
Jakubowski, M. W., Evans, T. E., Fenstermacher, M. E., Groth, M., Lasnier, C. J., Leonard, A. W., Schmitz, O., Watkins, J. G., Eich, T., Fundamenski, W., Moyer, R. A., Wolf, R. C., Baylor, L. B., Boedo, J. A., Burrell, K. H., Frerichs, H., deGrassie, J. S., Gohil, P., Joseph, I., Mordijck, S., Lehnen, M., Petty, C. C., Pinsker, R. I., Reiter, D., Rhodes, T. L., Samm, U., Schaffer, M. J., Snyder, P. B., Stoschus, H., Osborne, T., Unterberg, B., Unterberg, E., and West, W. P. Fri . "Overview of the results on divertor heat loads in RMP controlled H-modeplasmas on DIII-D". United States. doi:10.1088/0029-5515/49/9/095013. https://www.osti.gov/servlets/purl/1237581.
@article{osti_1237581,
title = {Overview of the results on divertor heat loads in RMP controlled H-modeplasmas on DIII-D},
author = {Jakubowski, M. W. and Evans, T. E. and Fenstermacher, M. E. and Groth, M. and Lasnier, C. J. and Leonard, A. W. and Schmitz, O. and Watkins, J. G. and Eich, T. and Fundamenski, W. and Moyer, R. A. and Wolf, R. C. and Baylor, L. B. and Boedo, J. A. and Burrell, K. H. and Frerichs, H. and deGrassie, J. S. and Gohil, P. and Joseph, I. and Mordijck, S. and Lehnen, M. and Petty, C. C. and Pinsker, R. I. and Reiter, D. and Rhodes, T. L. and Samm, U. and Schaffer, M. J. and Snyder, P. B. and Stoschus, H. and Osborne, T. and Unterberg, B. and Unterberg, E. and West, W. P.},
abstractNote = {This paper demonstrates the manipulation of power deposition on divertor targets at DIII-D by the application of resonant magnetic perturbations (RMPs) for suppression of large type-I edge localized modes (ELMs) is analysed. We discuss the modification of the ELM characteristics by the RMP applied. It is shown that the width of the deposition pattern in ELMy H-mode depends linearly on the ELM deposited energy, whereas in the RMP phase of the discharge those patterns are controlled by the externally induced magnetic perturbation. It was also found that the manipulation of heat transport due to the application of small, edge RMP depends on the plasma pedestal electron collisionality. We then compare in this analysis RMP and no RMP phases with and without complete ELM suppression. At high , the heat flux during the ELM suppressed phase is of the same order as the inter-ELM and the no-RMP phase. However, below this collisionality value, a slight increase in the total power flux to the divertor is observed during the RMP phase. We surmised that this is most likely caused by a more negative potential at the divertor surface due to hot electrons reaching the divertor surface from the pedestal area along perturbed, open field lines.},
doi = {10.1088/0029-5515/49/9/095013},
journal = {Nuclear Fusion},
number = ,
volume = 49,
place = {United States},
year = {2009},
month = {8}
}

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