Correlation ECE diagnostic in Alcator C-Mod
| Autor: | Rui Vieira, C. Gao, John Rice, Randy Michael Churchill, Miklos Porkolab, Matthew Reinke, Curran Oi, James Irby, Amanda Hubbard, Paul Ennever, Anne White, D. R. Mikkelsen, Martin Greenwald, J.R. Walk, Nathaniel Thomas Howard, Christian Theiler, Choongki Sung, R. Leccacorvi, Jerry Hughes |
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| Přispěvatelé: | Massachusetts Institute of Technology. Department of Nuclear Science and Engineering, Massachusetts Institute of Technology. Department of Physics, Massachusetts Institute of Technology. Plasma Science and Fusion Center, Sung, Choongki, White, Anne E., Howard, Nathaniel Thomas, Irby, James Henderson, Leccacorvi, Rick, Vieira, Rui F., Oi, Curran, Rice, John E., Reinke, Matthew Logan, Gao, Chi, Ennever, Paul Chappell, Porkolab, Miklos, Churchill, Randy, Theiler, Christian, Walk, John R., Jr., Hughes, Jerry W., Jr., Hubbard, Amanda E., Greenwald, Martin J. |
| Jazyk: | angličtina |
| Rok vydání: | 2015 |
| Předmět: | |
| Zdroj: | EPJ Web of Conferences EPJ Web of Conferences, Vol 87, p 03007 (2015) |
| Popis: | Correlation ECE (CECE) is a diagnostic technique that allows measurement of small amplitude electron temperature, T[subscript e], fluctuations through standard cross-correlation analysis methods. In Alcator C-Mod, a new CECE diagnostic has been installed[Sung RSI 2012], and interesting phenomena have been observed in various plasma conditions. We find that local T[subscript e] fluctuations near the edge (ρ ~ 0:8) decrease across the linearto- saturated ohmic confinement transition, with fluctuations decreasing with increasing plasma density[Sung NF 2013], which occurs simultaneously with rotation reversals[Rice NF 2011]. T[subscript e] fluctuations are also reduced across core rotation reversals with an increase of plasma density in RF heated L-mode plasmas, which implies that the same physics related to the reduction of T[subscript e] fluctuations may be applied to both ohmic and RF heated L-mode plasmas. In I-mode plasmas, we observe the reduction of core T[subscript e] fluctuations, which indicates changes of turbulence occur not only in the pedestal region but also in the core across the L/I transition[White NF 2014]. The present CECE diagnostic system in C-Mod and these experimental results are described in this paper. |
| Databáze: | OpenAIRE |
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