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Fast modulating electron cyclotron emission (FMECE) diagnostic for tokamaks

Journal Article · · Review of Scientific Instruments
DOI:https://doi.org/10.1063/5.0043761· OSTI ID:1777850
 [1];  [2];  [2];  [2];  [3]
  1. Univ. of Texas, Austin, TX (United States); The University of Texas at Austin
  2. Univ. of Texas, Austin, TX (United States)
  3. Chinese Academy of Sciences, Hefei (China)
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Utilizing variable-frequency channels, e.g., yttrium iron garnet (YIG) bandpass filters, in the intermediate frequency (IF) section of an electron cyclotron emission (ECE) radiometer facilitates flexibility in the volume viewed by the ECE channels as well as high resolution electron temperature and temperature fluctuation measurements in tokamaks. Fast modulating electron cyclotron emission (FMECE), a stand-alone IF section with eight channels, is a novel application of YIG filters for real-time electron temperature gradient and gradient scale length measurements. Key to FMECE is a simultaneous input/output data acquisition unit, as well as a modified type of YIG filters, which is capable of fast switching of their center (set) frequencies with a frequency slew rate of 600 μs/GHz. A new FMECE has been implemented and tested on the DIII-D tokamak, demonstrating its capability in real-time gradient measurements. Here, the data presented here shows that FMECE can identify flattening in the electron temperature profile; the latter can be used as a sensor for real time monitoring and control of plasma instabilities. Implementation and application are planned for the EAST tokamak.
Research Organization:
Univ. of Texas, Austin, TX (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Fusion Energy Sciences (FES)
Grant/Contract Number:
SC0010500
OSTI ID:
1777850
Alternate ID(s):
OSTI ID: 1832903
Journal Information:
Review of Scientific Instruments, Journal Name: Review of Scientific Instruments Journal Issue: 3 Vol. 92; ISSN 0034-6748
Publisher:
American Institute of Physics (AIP)Copyright Statement
Country of Publication:
United States
Language:
English

References (12)

Real-time mirror steering for improved closed loop neoclassical tearing mode suppression by electron cyclotron current drive in DIII-D journal November 2013
High spatial resolution upgrade of the electron cyclotron emission radiometer for the DIII-D tokamak journal November 2014
Temperature gradient scale length measurement: A high accuracy application of electron cyclotron emission without calibration journal July 2016
Correlation electron cyclotron emission diagnostic in TCV journal August 2017
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 October 2018
The Scattered Light Time-history Diagnostic suite at the National Ignition Facility journal March 2021
Fast production of microwave component prototypes by additive manufacturing and copper coating journal March 2021
Progress in quantifying the edge physics of the H mode regime in DIII-D journal December 2001
State-of-the-art neoclassical tearing mode control in DIII-D using real-time steerable electron cyclotron current drive launchers journal May 2014
Integrated modeling applications for tokamak experiments with OMFIT journal July 2015
Analysis of electron cyclotron emission with extended electron cyclotron forward modeling journal September 2018
A Review of ECE Correlation Radiometry Techniques for Detection of Core Electron Temperature Fluctuations journal August 2007

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47 OTHER INSTRUMENTATION
Fusion diagnostics
electron cyclotron emission
microwave emission
microwaves
tokamaks