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Development of a radiative divertor for DIII-D

Conference ·
OSTI ID:10173463
 [1];  [2];  [3]
  1. Lawrence Livermore National Lab., CA (United States)
  2. General Atomics, San Diego, CA (United States)
  3. Sandia National Labs., Albuquerque, NM (United States); and others
+ Show Author Affiliations
We have used experiments and modeling to develop a new radiative divertor configuration for DIII-D. Gas puffing experiments with the existing open divertor have shown the creation of a localized ({approximately}10 cm diameter) radiation zone which results in substantial reduction (3--10) in the divertor heat flux while {delta}{sub E} remains {approximately}2 times ITER-89P scaling. However, ne increases with D{sub 2} puffing, and Z{sub eff} increases with neon puffing. Divertor structures are required to minimize the effects on the core plasma. The UEDGE fluid code, benchmarked with DIII-D data, and the DEGAS neutrals transport code are used to estimate the effectiveness of divertor configurations; slots reduce the core ionization more than baffles. The overall divertor shape is set by confinement studies which indicate that high triangularity ({delta} {approximately}0.8) is important for high {tau}{sub E} VH-modes. Results from engineering feasibility studies, including diagnostic access, will be presented.
Research Organization:
General Atomics, San Diego, CA (United States); Oak Ridge National Lab., TN (United States); Lawrence Livermore National Lab., CA (United States); Sandia National Labs., Albuquerque, NM (United States); EG and G Idaho, Inc., Idaho Falls, ID (United States)
Sponsoring Organization:
USDOE, Washington, DC (United States)
DOE Contract Number:
AC03-89ER51114; AC05-84OR21400; W-7405-ENG-48; AC04-76DP00789; AC07-76ID01570
OSTI ID:
10173463
Report Number(s):
GA-A--21714; UCRL-JC--115490; CONF-940580--11; ON: DE94016522; BR: 35AT10020/35KC07000
Country of Publication:
United States
Language:
English

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Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
700420
CONFINEMENT TIME
DESIGN
DIVERTORS
DOUBLET-3 DEVICE
HEAT FLUX
PLASMA CONFINEMENT
PLASMA-FACING COMPONENTS