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Title: Effect of heating scheme on SOL width in DIII-D and EAST

Abstract

Joint DIII-D/EAST experiments in the radio-frequency (RF) heated H-mode scheme with comparison to that of neutral beam (NB) heated H-mode scheme were carried out on DIII-D and EAST under similar conditions to examine the effect of heating scheme on scrape-off layer (SOL) width in H-mode plasmas for application to ITER. A dimensionally similar plasma equilibrium was used to match the EAST shape parameters. The divertor heat flux and SOL widths were measured with infra-red camera in DIII-D, while with divertor Langmuir probe array in EAST. It has been demonstrated on both DIII-D and EAST that RF-heated plasma has a broader SOL than NB-heated plasma when the edge electrons are effectively heated in low plasma current and low density regime with low edge collisionality. Detailed edge and pedestal profile analysis on DIII-D suggests that the low edge collisionality and ion orbit loss effect may account for the observed broadening. Finally, the joint experiment in DIII-D has also demonstrated the strong inverse dependence of SOL width on the plasma current in electron cyclotron heated (ECH) H-mode plasmas.

Authors:
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  1. Chinese Academy of Sciences (CAS), Hefei (China)
  2. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
  3. Chinese Academy of Sciences (CAS), Hefei (China); General Atomics, San Diego, CA (United States)
  4. General Atomics, San Diego, CA (United States)
  5. Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
Publication Date:
Research Org.:
Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States); Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Sponsoring Org.:
USDOE
Contributing Org.:
Institute of Plasma Physics, Chinese Academy of Sciences, 230031 Hefei, China; Lawrence Livermore National Laboratory, Livermore, California 94551, USA; General Atomics, San Diego, CA92186-5608, USA; Princeton Plasma Physics Laboratory, Princeton, NJ 08543, USA
OSTI Identifier:
1346428
Alternate Identifier(s):
OSTI ID: 1349259
Grant/Contract Number:  
2013GB107003; 2015GB101000; AC52-07NA27344; FC02-04ER54698; FG02-95ER54309; 11575236; 11422546; 11261140328
Resource Type:
Journal Article: Published Article
Journal Name:
Nuclear Materials and Energy
Additional Journal Information:
Journal Volume: 12; Journal ID: ISSN 2352-1791
Publisher:
Elsevier
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; SOL width; radio-frequency heating; neutral beam heating; low collisionality

Citation Formats

Wang, L., Makowski, M. A., Guo, H. Y., Leonard, A. W., Xu, G. S., Gong, X. Z., Garofalo, A. M., Deng, G. Z., Petrie, T. W., Thomas, D., Jackson, G., Kramer, G., Maingi, R., Liu, J. B., Feng, W., Wang, H., Zhang, B., Ding, S., Pan, C. K., Hu, Y. J., Qian, J. P., Li, J., and Wan, B. N. Effect of heating scheme on SOL width in DIII-D and EAST. United States: N. p., 2017. Web. doi:10.1016/j.nme.2017.01.024.
Wang, L., Makowski, M. A., Guo, H. Y., Leonard, A. W., Xu, G. S., Gong, X. Z., Garofalo, A. M., Deng, G. Z., Petrie, T. W., Thomas, D., Jackson, G., Kramer, G., Maingi, R., Liu, J. B., Feng, W., Wang, H., Zhang, B., Ding, S., Pan, C. K., Hu, Y. J., Qian, J. P., Li, J., & Wan, B. N. Effect of heating scheme on SOL width in DIII-D and EAST. United States. doi:10.1016/j.nme.2017.01.024.
Wang, L., Makowski, M. A., Guo, H. Y., Leonard, A. W., Xu, G. S., Gong, X. Z., Garofalo, A. M., Deng, G. Z., Petrie, T. W., Thomas, D., Jackson, G., Kramer, G., Maingi, R., Liu, J. B., Feng, W., Wang, H., Zhang, B., Ding, S., Pan, C. K., Hu, Y. J., Qian, J. P., Li, J., and Wan, B. N. Fri . "Effect of heating scheme on SOL width in DIII-D and EAST". United States. doi:10.1016/j.nme.2017.01.024.
@article{osti_1346428,
title = {Effect of heating scheme on SOL width in DIII-D and EAST},
author = {Wang, L. and Makowski, M. A. and Guo, H. Y. and Leonard, A. W. and Xu, G. S. and Gong, X. Z. and Garofalo, A. M. and Deng, G. Z. and Petrie, T. W. and Thomas, D. and Jackson, G. and Kramer, G. and Maingi, R. and Liu, J. B. and Feng, W. and Wang, H. and Zhang, B. and Ding, S. and Pan, C. K. and Hu, Y. J. and Qian, J. P. and Li, J. and Wan, B. N.},
abstractNote = {Joint DIII-D/EAST experiments in the radio-frequency (RF) heated H-mode scheme with comparison to that of neutral beam (NB) heated H-mode scheme were carried out on DIII-D and EAST under similar conditions to examine the effect of heating scheme on scrape-off layer (SOL) width in H-mode plasmas for application to ITER. A dimensionally similar plasma equilibrium was used to match the EAST shape parameters. The divertor heat flux and SOL widths were measured with infra-red camera in DIII-D, while with divertor Langmuir probe array in EAST. It has been demonstrated on both DIII-D and EAST that RF-heated plasma has a broader SOL than NB-heated plasma when the edge electrons are effectively heated in low plasma current and low density regime with low edge collisionality. Detailed edge and pedestal profile analysis on DIII-D suggests that the low edge collisionality and ion orbit loss effect may account for the observed broadening. Finally, the joint experiment in DIII-D has also demonstrated the strong inverse dependence of SOL width on the plasma current in electron cyclotron heated (ECH) H-mode plasmas.},
doi = {10.1016/j.nme.2017.01.024},
journal = {Nuclear Materials and Energy},
number = ,
volume = 12,
place = {United States},
year = {Fri Mar 10 00:00:00 EST 2017},
month = {Fri Mar 10 00:00:00 EST 2017}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record at 10.1016/j.nme.2017.01.024

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