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

Journal Article · Tue Aug 01 00:00:00 EDT 2017 · Nuclear Materials and Energy

DOI:https://doi.org/10.1016/j.nme.2017.01.024· OSTI ID:1346428

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.

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.

• Research Organization: Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States); Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
• Sponsoring Organization: USDOE
• Contributing Organization: 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
• Grant/Contract Number: AC52-07NA27344; FC02-04ER54698; FG02-95ER54309; 2013GB107003; 2015GB101000; 11575236; 11422546; 11261140328
• OSTI ID: 1346428
• Alternate ID(s): OSTI ID: 1349259
• Journal Information: Nuclear Materials and Energy, Journal Name: Nuclear Materials and Energy Vol. 12 Journal Issue: C; ISSN 2352-1791
• Publisher: Elsevier
• Country of Publication: Netherlands
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
SOL width
radio-frequency heating
neutral beam heating
low collisionality