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GA-A 22598 MODELING OF 110 GHz ELECTRON CYCLOTRON WAVE PROPAGATION AND ABSORPTION ON DIII-D by
| Content Provider | Semantic Scholar |
|---|---|
| Author | Lin-Liu, Y. R. Luce, Tim C. Chiu, Sin Chuen Miller, Ronald L. Prater, Russell |
| Copyright Year | 1997 |
| Abstract | Warm plasma refraction effects on wave propagation and absorption are examined in the context of a slab model in the parameter regime of interest to the upcoming 110 GHz electron cyclotron heating and current drive experiments on DID-D. In modeling electron cyclotron (EC) waves for heating (ECH) and current drive (ECCD) applications, the standard approach describes wave propagation using geometric optic ray tracing with cold plasma dispersion and wave absorption using a relativistic warm plasma expression. However, recent vertical 0-mode transmission measurements on Tore Supra [ 11 indicate that wave trajectories near the fundamental resonance frequency can significantly deviate from predictions of cold plasma analysis. The experimental results were attributed to warm plasma refraction effects caused by the anomalous dispersion associated with wave-particle resonance [2,3]. In this work, we examine the anomalous dispersion using a weakly relativistic dielectric model of Matsuda and Hsu [4]. We assess the impact of the warm plasma refraction effects on wave propagation and absorption using a slab model. Our attention focuses on the parameter regime directly relevant to the upcoming 110 GHz ECH and ECCD experiments on DEI-D. The goal of the ECH and ECCD experiments on DII-D is to demonstrate the capability of localized heating and current drive for pressure and current profile control in the advanced tokamak operational regime. In the new DIII-D ECH system, 110 GHz EC waves with X-mode polarization are launched from an upper low-field side port. The microwave beam is injected 19" off normal for current drive applications, and it can be steered poloidally to provide power deposition from the center to the upper outer edge of the plasma. For details of the ECH system see Callis et al. in these Proceedings. The major and minor radii of DIII-D are, respectively, & = 1.7 m and a = 0.6 m. The nominal magnetic field is BO = 2.0 T. The plasma parameter regime of interest in the near-term experiments ranges from neTe = 0.5 -1.5 (1020,-3 keV). GENERAL ATOMICS REPORT GA-A22598 1 |
| File Format | PDF HTM / HTML |
| Alternate Webpage(s) | https://fusion.gat.com/pubs-ext/RF97/A22598.pdf |
| Alternate Webpage(s) | https://digital.library.unt.edu/ark:/67531/metadc674867/m2/1/high_res_d/486160.pdf |
| Language | English |
| Access Restriction | Open |
| Content Type | Text |
| Resource Type | Article |
