Progress in snowflake divertor research in DIII-D, NSTX and NSTX-U

V A Soukhanovskii; S.L. Allen; M.E. Fenstermacher; O Izacard; C. Lasnier; M. Makowski; A.G. McLean; W.H. Meyer; D Ryutov; F. Scotti; D. Eldon; E. Kolemen; P Vail; Gustavo Canal; R.J. Groebner; A.W. Hyatt; A.W. Leonard; T. Osborne; R. E. Bell; A Diallo; S. P. Gerhardt; Stanley Kaye; B. P. LeBlanc; J. E. Menard; M. Podesta

Progress in snowflake divertor research in DIII-D, NSTX and NSTX-U

POSTER

Abstract

Recent snowflake (SF) divertor DIII-D experiments focused on divertor heat transport under attached and radiative divertor conditions, incl 1-understanding of increased scrape-off layer width in SF-plus configuration at lower densities; 2-particle, heat and radiation distribution in the SF divertor with CD$_4$ seeding. NSTX data was analyzed to understand the link between SF divertor and ELM (de)stabilization with and without CD$_4$ seeding and lithium conditioning. Prep for SF divertor experiments in NSTX-U include 1-equilibria modeling with ISOLVER code using various sets of divertor coils and L- and H-mode plasma scenarios; 2-transport and impurity radiation modeling with UEDGE code; 3-new diagnostics (ie-a 100-200 kHz camera for null-region mode observations).

Authors

V A Soukhanovskii

LLNL
S.L. Allen

LLNL
M.E. Fenstermacher

LLNL, LLNL; DIII-D Team
O Izacard

LLNL
C. Lasnier

LLNL
M. Makowski

LLNL
A.G. McLean

LLNL
W.H. Meyer

LLNL
D Ryutov

LLNL
F. Scotti

LLNL, Lawrence Livermore National Laboratory
D. Eldon

PPPL, PRINCETON U, Princeton University
E. Kolemen

PRINCETON U, PPPL
P Vail

PRINCETON U
Gustavo Canal

GA/ORAU, General Atomics
R.J. Groebner

GA, General Atomics
A.W. Hyatt

GA, General Atomics
A.W. Leonard

GA, General Atomics
T. Osborne

GA, General Atomics
R. E. Bell

PPPL, Princeton Plasma Physics Laboratory, Princeton University, Princeton NJ 08543, pppl, Princeton Plasma Physics Laboratory
A Diallo

PPPL, Princeton Plasma Physics Laboratory, Princeton University, Princeton NJ 08543, Princeton Plasma Physics Laboratory, pppl
S. P. Gerhardt

PPPL, Princeton Plasma Physics Laboratory
Stanley Kaye

PPPL, Princeton Plasma Physics Laboratory, Princeton University, Princeton NJ 08543
B. P. LeBlanc

PPPL, Princeton Plasma Physics Laboratory
J. E. Menard

PPPL, Princeton Plasma Physics Laboratory
M. Podesta

PPPL, Princeton Plasma Physics Laboratory, Princeton University, Princeton NJ 08543, pppl, Princeton Plasma Physics Laboratory