Variable location channels to improve efficiency and precision for direct ∇Te measurements and high spatial resolution Te -profile measurements using electron cyclotron emission

Houshmandyar, S.; Austin, M. E.; Brookman, M. W.; Liu, Y.; Rowan, W. L.; Zhao, H.

doi:10.1063/1.5035429

Variable location channels to improve efficiency and precision for direct ∇T_e measurements and high spatial resolution T_e -profile measurements using electron cyclotron emission

Journal Article · Mon Aug 27 00:00:00 EDT 2018 · Review of Scientific Instruments

DOI:https://doi.org/10.1063/1.5035429· OSTI ID:1610389

^[1]; Austin, M. E. ^[2]; ^[3]; ^[4]; ^[2]; Zhao, H. ^[5]

Univ. of Texas, Austin, TX (United States); DOE/OSTI
Univ. of Texas, Austin, TX (United States)
Univ. of Texas, Austin, TX (United States); General Atomics, San Diego, CA (United States)
Chinese Academy of Sciences (CAS), Hefei (China)
Univ. of Texas, Austin, TX (United States); Chinese Academy of Sciences (CAS), Hefei (China)

Electron cyclotron emission (ECE) diagnostics that use variable location channels based on yttrium iron garnet (YIG) bandpass filters improve the precision and the efficiency of measurements of electron temperature (T_e) profiles and fluctuations (δT_e). These variable frequency filters were substituted for fixed frequency filters in the intermediate frequency section to achieve the required higher resolution over a target radial range, just before the experiment. In this paper, we present the proof-of-principle for high temporal resolution measurement of the electron temperature gradient, via real-time slewing of a YIG filter for relocation of an ECE channel during a long pulse. The key component is the application of YIG tunable filters with their narrow bandwidth and capability for a high slew rate of their center frequency. This application permits fast relocation of the ECE channels for direct measurement of the gradient and close spacing of channels to investigate the magnetic island’s dynamic behavior.

Research Organization:: Univ. of Texas, Austin, TX (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Fusion Energy Sciences (FES) (SC-24)

Grant/Contract Number:: FG02-97ER54415; SC0010500

OSTI ID:: 1610389

Alternate ID(s):: OSTI ID: 1466871

Journal Information:: Review of Scientific Instruments, Journal Name: Review of Scientific Instruments Journal Issue: 10 Vol. 89; ISSN 0034-6748

Publisher:: American Institute of Physics (AIP)Copyright Statement

Country of Publication:: United States

Language:: English

References (5)

High spatial resolution upgrade of the electron cyclotron emission radiometer for the DIII-D tokamak Truong, D. D.; Austin, M. E. Review of Scientific Instruments, Vol. 85, Issue 11 https://doi.org/10.1063/1.4889737	journal	November 2014
Temperature gradient scale length measurement: A high accuracy application of electron cyclotron emission without calibration Houshmandyar, S.; Yang, Z. J.; Phillips, P. E. Review of Scientific Instruments, Vol. 87, Issue 11 https://doi.org/10.1063/1.4955297	journal	July 2016
Correlation electron cyclotron emission diagnostic in TCV Fontana, M.; Porte, L.; Molina Cabrera, P. Review of Scientific Instruments, Vol. 88, Issue 8 https://doi.org/10.1063/1.4997075	journal	August 2017
Electron critical gradient scale length measurements of ICRF heated L-mode plasmas at Alcator C-Mod tokamak Houshmandyar, S.; Hatch, D. R.; Horton, C. W. Physics of Plasmas, Vol. 25, Issue 4 https://doi.org/10.1063/1.5022180	journal	April 2018
The effect of triangularity on fluctuations in a tokamak plasma Fontana, M.; Porte, L.; Coda, S. Nuclear Fusion, Vol. 58, Issue 2 https://doi.org/10.1088/1741-4326/aa98f4	journal	December 2017

Cited By (1)

Upgrade of the ECE diagnostic on EAST Zhao, Hailin; Zhou, Tianfu; Liu, Yong Review of Scientific Instruments, Vol. 89, Issue 10 https://doi.org/10.1063/1.5035452	journal	October 2018

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