Status of Advanced Tokamak Scenario Modeling with Off-Axis Electron Cyclotron Current Drive in DIII-D
Description/Abstract
The status of modeling work focused on developing the advanced tokamak scenarios in DIII-D is discussed. The objectives of the work are two-fold: (1) to develop AT scenarios with ECCD using time-dependent transport simulations, coupled with heating and current drive models, consistent with MHD equilibrium and stability; and (2) to use time-dependent simulations to help plan experiments and to understand the key physics involved. Time-dependent simulations based on transport coefficients derived from experimentally achieved target discharges are used to perform AT scenario modeling. The modeling indicates off-axis ECCD with approximately 3 MW absorbed power can maintain high-performance discharges with q{sub min} > 1 for 5 to 10 s. The resultant equilibria are calculated to be stable to n = 1 pressure driven modes. The plasma is well into the second stability regime for high-n ballooning modes over a large part of the plasma volume. The role of continuous localized ECCD is studied for stabilizing m/n = 2/1 tearing modes. The progress towards validating current drive and transport models, consistent with experimental results, and developing self-consistent, integrated high performance AT scenarios is discussed.
| Creator/Author: | M. Murakami ; H.E. St.John ; T.A. Casper ; M.S. Chu ; J.C. DeBoo ; C.M. Greenfield ; J.E. Kinsey ; L.L. Lao ; R.J. La Haye ; Y.R. Lin-Liu ; T.C. Luce ; P.A. Politzer ; B.W. Rice ; G.M. Staebler ; T.S. Taylor ; M.R. Wade |
|---|---|
| Publication Date: | 1999 Dec 01 |
| OSTI Identifier: | OSTI ID: 766945 |
| Report Number(s): | GA-A23310 |
| DOE Contract Number: | AC03-99ER54463; AC05-96OR22464; W-7405-ENG-48; FG03-95ER54309 |
| Other Number(s): | TRN: US0110521 |
| Resource Type: | Conference |
| Resource Relation: | Conference: 2nd IAEA Technical Committee Meeting on Steady-State Operation of Magnetic Fusion Devices, Fukuoka (JP), 10/25/1999--10/29/1999; Other Information: PBD: 1 Dec 1999 |
| Research Org: | General Atomics, San Diego, CA (US) |
| Sponsoring Org: | US Department of Energy (US) |
| Subject: | 70 PLASMA PHYSICS AND FUSION TECHNOLOGY; DOUBLET-3 DEVICE; ECR HEATING; MHD EQUILIBRIUM; PERFORMANCE; MATHEMATICAL MODELS; ECR CURRENT DRIVE; COMPUTERIZED SIMULATION |
| Country of Publication: | United States |
| Language: | English |
| Format: | Size: vp. |
| Availability: | INIS; OSTI as DE00766945 To purchase this media from NTIS, click here |
| Update Date: | 2012 Feb 23 |
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