Measurement of electron temperature fluctuations using a tunable correlation electron cyclotron emission system on Alcator C-Mod

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A tunable correlation electron cyclotron (CECE) system was recently installed on the Alcator C-Mod tokamak to provide local, quantitative measurement of electron temperature fluctuations in the tokamak core. This system represents a significant upgrade from the original CECE system, expanding the measurement capabilities from 4 to 8 total channels, including 2 remotely tunable YIG filters (6-18 GHz; 200 MHz bandwidth). Additional upgrades were made to the optical system to provide enhanced poloidal resolution and allow for measurement of turbulent fluctuations below k(theta)rho(s) < 0.3. These expanded capabilities allow for single shot measurement of partial temperature fluctuation profiles in the region rho = 0.7 - 0.9 (square root of normalized toroidal flux) in a wide variety of plasma conditions. These measurements are currently being used to provide stringent tests of the gyrokinetic model in ongoing model validation efforts. Details of the hardware upgrades, turbulent fluctuation measurements, and ongoing comparisons with simulations are presented. (C) 2014 AIP Publishing LLC.
Publisher
AMER INST PHYSICS
Issue Date
2014-11
Language
English
Article Type
Article; Proceedings Paper
Citation

REVIEW OF SCIENTIFIC INSTRUMENTS, v.85, no.11

ISSN
0034-6748
DOI
10.1063/1.4886422
URI
http://hdl.handle.net/10203/272840
Appears in Collection
NE-Journal Papers(저널논문)
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