Recent DIII-D divertor research
- Lawrence Livermore National Lab., CA (United States)
- General Atomics, San Diego, CA (United States); and others
DIII-D currently operates with a single- or double-null open divertor and graphite walls. Active particle control with a divertor cryopump has demonstrated density control, efficient helium exhaust, and reduction of the inventory of particles in the wall. Gas puffing of D{sub 2} and impurities has demonstrated reduction of the peak divertor beat flux by factors of 3--5 by radiation. A combination of active cryopumping and feedback-controlled D{sub 2} gas puffing has produced similar divertor heat flux reduction with density control. Experiments with neon puffing have shown that the radiation is equally-divided between a localized zone near the X-point and a mantle around the plasma core. The density in these experiments has also been controlled with cryopumping. These experimental results combined with modeling were used to develop the new Radiative Divertor for DIII-D. This is a double-null slot divertor with four cryopumps to provide particle control and neutral shielding for high-triangularity advanced tokamak discharges. UEDGE and DEGAS simulations, benchmarked to experimental data, have been used to optimize the design.
- Research Organization:
- General Atomics, San Diego, CA (United States); Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Sandia National Lab. (SNL-NM), Albuquerque, NM (United States); Univ. of California, Los Angeles, CA (United States); Naval Research Lab., Washington, DC (United States); Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
- Sponsoring Organization:
- USDOE, Washington, DC (United States)
- DOE Contract Number:
- AC03-89ER51114; AC05-84OR21400; AC04-76DP00789; FG03-89ER51121; AI05-86ER53224; W-7405-ENG-48
- OSTI ID:
- 195737
- Report Number(s):
- GA-A22091; CONF-950704-17; ON: DE96005590; TRN: AHC29605%%113
- Resource Relation:
- Conference: 22. European conference on controlled fusion and plasma physics, Bournemouth (United Kingdom), 2-7 Jul 1995; Other Information: PBD: Jul 1995
- Country of Publication:
- United States
- Language:
- English
Similar Records
Radiative and SOL experiments in open and baffled divertors on DIII-D
Engineering design of a radiative divertor for DIII-D