Optimization of the snowflake divertor for power and particle exhaust on NSTX-U

被引：10
|
作者：
Vail, P. J. [1 ]
Izacard, O. [1 ]
Kolemen, E. [1 ]
机构：
[1] Princeton Univ, Dept Mech & Aerosp Engn, Princeton, NJ 08544 USA
来源：
NUCLEAR MATERIALS AND ENERGY | 2019年 / 19卷
基金：
美国能源部;
关键词：
NSTX-U; snowflake divertor; cryopump; UEDGE; DIII-D; TRANSPORT;
D O I：
10.1016/j.nme.2019.03.003
中图分类号：
TL [原子能技术]; O571 [原子核物理学];
学科分类号：
0827 ; 082701 ;
摘要：
In this paper, simple analytical modeling and numerical simulations performed with the multi-fluid edge transport code UEDGE are used to identify optimal snowflake divertor (SFD) configurations for heat flux mitigation and sufficient cryopumping performance on the National Spherical Torus eXperiment Upgrade (NSTX-U). A model is presented that describes the partitioning of sheath-limited SOL power and particle exhaust in the SFD as a result of diffusive transport to multiple activated strike points. The model is validated against UEDGE predictions and used to analyze a database of 70 SFD-minus equilibria. The optimal location for the entrance to a divertor cryopumping system on NSTX-U is computed for enabling sufficient pumping performance with acceptable power loading in a variety of SFD-minus configurations. UEDGE simulations of one promising equilibrium from the database indicate that a significant redistribution of power to the divertor legs occurs as a result of neutral particle removal near one of the SFD-minus strike points in the outboard scrape-off layer. It is concluded that pump placement at the optimal location is advantageous as the large number of compatible equilibria reduces the precision required of real-time SFD configuration control systems and enables acceptable divertor solutions even if UEDGE-predicted power redistribution slightly reduces the achievable pumping performance.
引用
收藏
页码：516 / 523
页数：8
相关论文
共 50 条
  • [1] Snowflake Divertor Experiments in the DIII-D, NSTX, and NSTX-U Tokamaks Aimed at the Development of the Divertor Power Exhaust Solution
    Soukhanovskii, V. A.
    Allen, S. L.
    Fenstermacher, M. E.
    Lasnier, C. J.
    Makowski, M. A.
    McLean, A. G.
    Meier, E. T.
    Meyer, W. H.
    Rognlien, T. D.
    Ryutov, D. D.
    Scotti, F.
    Kolemen, E.
    Bell, R. E.
    Diallo, A.
    Gerhardt, S.
    Kaita, R.
    Kaye, S.
    LeBlanc, B. P.
    Maingi, R.
    Menard, J. E.
    Podesta, M.
    Roquemore, A. L.
    Groebner, R. J.
    Hyatt, A. W.
    Leonard, A. W.
    Osborne, T. H.
    Petrie, T. W.
    Ahn, J. -W.
    Raman, R.
    Watkins, J. G.
    IEEE TRANSACTIONS ON PLASMA SCIENCE, 2016, 44 (12) : 3445 - 3455
  • [2] Developing snowflake divertor physics basis in the DIII-D, NSTX and NSTX-U tokamaks aimed at the divertor power exhaust solution
    Soukhanovskii, V. A.
    Allen, S. L.
    Fenstermacher, M. E.
    Lasnier, C. J.
    Makowski, M. A.
    McLean, A. G.
    Meier, E. T.
    Meyer, W. H.
    Rognlien, T. D.
    Ryutov, D. D.
    Scotti, F.
    Kolemen, E.
    Bell, R. E.
    Diallo, A.
    Gerhardt, S.
    Kaita, R.
    Kaye, S.
    LeBlanc, B. P.
    Maingi, R.
    Menard, J. E.
    Podesta, M.
    Roquemore, A. L.
    Groebner, R. J.
    Hyatt, A. W.
    Leonard, A. W.
    Osborne, T. H.
    Petrie, T. W.
    Ahn, J. -W.
    Raman, R.
    Watkins, J. G.
    2015 IEEE 26TH SYMPOSIUM ON FUSION ENGINEERING (SOFE), 2015,
  • [3] Design and simulation of the snowflake divertor control for NSTX-U
    Vail, P. J.
    Boyer, M. D.
    Welander, A. S.
    Kolemen, E.
    PLASMA PHYSICS AND CONTROLLED FUSION, 2019, 61 (03)
  • [4] Divertor leg filaments in NSTX-U
    Scotti, Filippo
    Zweben, Stewart
    Soukhanovskii, Vlad
    Baver, Derek
    Myra, James
    NUCLEAR FUSION, 2018, 58 (12)
  • [5] "Snowflake" divertor configuration in NSTX
    Soukhanovskii, V. A.
    Ahn, J-W
    Bell, R. E.
    Gates, D. A.
    Gerhardt, S.
    Kaita, R.
    Kolemen, E.
    Kugel, H. W.
    LeBlanc, B. P.
    Maingi, R.
    Maqueda, R.
    McLean, A.
    Menard, J. E.
    Mueller, D. M.
    Paul, S. F.
    Raman, R.
    Roquemore, A. L.
    Ryutov, D. D.
    Scott, H. A.
    JOURNAL OF NUCLEAR MATERIALS, 2011, 415 (01) : S365 - S368
  • [6] A study of X-divertor in NSTX-U with SOLPS simulations
    Chen, Zhong-Ping
    Kotschenreuther, Mike
    Mahajan, Swadesh
    Gerhardt, Stefan
    NUCLEAR FUSION, 2018, 58 (03)
  • [7] Diagnostic options for radiative divertor feedback control on NSTX-U
    Soukhanovskii, V. A.
    Gerhardt, S. P.
    Kaita, R.
    McLean, A. G.
    Raman, R.
    REVIEW OF SCIENTIFIC INSTRUMENTS, 2012, 83 (10):
  • [8] Conceptual design of a divertor Thomson scattering diagnostic for NSTX-U
    McLean, A. G.
    Soukhanovskii, V. A.
    Allen, S. L.
    Carlstrom, T. N.
    LeBlanc, B. P.
    Ono, M.
    Stratton, B. C.
    REVIEW OF SCIENTIFIC INSTRUMENTS, 2014, 85 (11):
  • [9] Exploration of magnetic perturbation effects on advanced divertor configurations in NSTX-U
    Frerichs, H.
    Schmitz, O.
    Waters, I.
    Canal, G. P.
    Evans, T. E.
    Feng, Y.
    Soukhanovskii, V. A.
    PHYSICS OF PLASMAS, 2016, 23 (06)
  • [10] Assessment of equilibrium field coil misalignments on the divertor footprints in NSTX-U
    Munaretto, S.
    Evans, T. E.
    Ferraro, M.
    Orlov, D. M.
    Trevisan, G. L.
    Wu, W.
    NUCLEAR FUSION, 2019, 59 (07)
12345