The snowflake divertor: A game-changer for magnetic fusion devices?

V. A. Soukhanovskii, J. W. Ahn, D. Battaglia, R. E. Bell, A. Diallo, S. Gerhardt, R. Kaita, S. Kaye, Egemen Kolemen, B. R. LeBlanc, R. Maingi, A. McLean, J. E. Menard, D. Mueller, S. F. Paul, M. Podesta, R. Raman, T. D. Rognlien, A. L. Roquemore, D. D. RyutovF. Scotti, M. V. Umansky

Research output: Chapter in Book/Report/Conference proceedingConference contribution

1 Scopus citations

Abstract

Introduction The spherical tokamak (ST) is viewed as a candidate concept for future fusion and nuclear science applications [1,2]. Divertor experiments in NSTX, a high-power density medium size ST (R = 0.85 m; a = 0.65 m) with graphite plasma-facing components (PFCs), have demonstrated the features of the inherently compact ST divertor. ITER-scale steady-state peak divertor heat fluxes qpk < 15 MW/m2 and q\\ < 200 MW/m2 have been measured in Ip = l.o -1.2 MA discharges heated by 6 MW NBI [3]. As a result of this and other ST- or NSTX-specific geometry features, e.g., a small in/out SOL power ratio, a small divertor PFC area, an open divertor geometry and reduced divertor volumetric (radiated power and momentum) losses, a reduced operating space of the conventional heat flux mitigation techniques, such as the divertor geometry and radiative divertor, has been found [4,5,6]. Viewing this as the challenge and the opportunity for plasma-material interface (PMI) development, NSTX research is now focusing on developing the PMI for future devices, in particular for NSTX-Upgrade [7], where steady-state qpk < 25 - 40 MW/m2 are predicted based on the present scalings [3].

Original languageEnglish (US)
Title of host publication38th EPS Conference on Plasma Physics 2011, EPS 2011 - Europhysics Conference Abstracts
Pages53-56
Number of pages4
StatePublished - Dec 1 2011
Event38th EPS Conference on Plasma Physics 2011, EPS 2011 - Strasbourg, France
Duration: Jun 27 2011Jul 1 2011

Publication series

Name38th EPS Conference on Plasma Physics 2011, EPS 2011 - Europhysics Conference Abstracts
Volume35 1

Other

Other38th EPS Conference on Plasma Physics 2011, EPS 2011
CountryFrance
CityStrasbourg
Period6/27/117/1/11

All Science Journal Classification (ASJC) codes

  • Nuclear and High Energy Physics

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    Soukhanovskii, V. A., Ahn, J. W., Battaglia, D., Bell, R. E., Diallo, A., Gerhardt, S., Kaita, R., Kaye, S., Kolemen, E., LeBlanc, B. R., Maingi, R., McLean, A., Menard, J. E., Mueller, D., Paul, S. F., Podesta, M., Raman, R., Rognlien, T. D., Roquemore, A. L., ... Umansky, M. V. (2011). The snowflake divertor: A game-changer for magnetic fusion devices? In 38th EPS Conference on Plasma Physics 2011, EPS 2011 - Europhysics Conference Abstracts (pp. 53-56). (38th EPS Conference on Plasma Physics 2011, EPS 2011 - Europhysics Conference Abstracts; Vol. 35 1).