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Active control of electron cyclotron emission radiometer channel frequencies for improved electron temperature measurements

Journal Article · · Review of Scientific Instruments
DOI:https://doi.org/10.1063/5.0043662· OSTI ID:1777851
 [1];  [2];  [2]
  1. Univ. of Texas, Austin, TX (United States); The University of Texas at Austin
  2. Univ. of Texas, Austin, TX (United States)
+ Show Author Affiliations
As advanced scenarios are developed for tokamak operations, the demand for flexibility of the electron cyclotron emission (ECE) channels’ locations has increased. The tunable feature of yttrium iron garnet (YIG) filters provides this spatial flexibility. Here, we present a method of performing ECE measurements on fixed flux surfaces instead of fixed frequencies. This is achieved by adjusting YIG filters utilized in the intermediate frequency section to frequencies associated with flux surfaces in regions of interest during the discharge. Here, the key components are the application of tunable YIG filters and a control program that calculates the filter settings using flux information from real-time reconstruction equilibria (EFIT). This fast procedure facilitates Te measurements in regions of interest to investigate plasma dynamic behaviors.
Research Organization:
Univ. of Texas, Austin, TX (United States)
Sponsoring Organization:
USDOE; USDOE Office of Science (SC), Fusion Energy Sciences (FES)
Grant/Contract Number:
FC02-04ER54698; FG02-97ER54415; SC0010500
OSTI ID:
1777851
Alternate ID(s):
OSTI ID: 1832991
OSTI ID: 1770619
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 (9)

A multi-channel correlation ECE system for electron temperature fluctuation measurement on EAST tokamak journal December 2019
High spatial resolution upgrade of the electron cyclotron emission radiometer for the DIII-D tokamak journal November 2014
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
Reconstructing 3D asymmetries in laser-direct-drive implosions on OMEGA journal March 2021
Fast modulating electron cyclotron emission (FMECE) diagnostic for tokamaks journal March 2021
Neural network surrogates of Bayesian diagnostic models for fast inference of plasma parameters journal March 2021
State-of-the-art neoclassical tearing mode control in DIII-D using real-time steerable electron cyclotron current drive launchers journal May 2014
The effect of triangularity on fluctuations in a tokamak plasma journal December 2017

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Fast modulating electron cyclotron emission (FMECE) diagnostic for tokamaks
Journal Article · Tue Mar 02 19:00:00 EST 2021 · Review of Scientific Instruments · OSTI ID:1777850

Related Subjects

47 OTHER INSTRUMENTATION
Fusion diagnostics
cyclotron radiation
electron cyclotron emission
linear filters
plasma diagnostics
real-time process
tokamaks