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Design and commissioning of resistive foil bolometer diagnostics on the ST40 tokamak

Journal Article · · Review of Scientific Instruments
DOI:https://doi.org/10.1063/5.0214400· OSTI ID:2447289
 [1];  [1];  [2];  [1];  [1];  [1];  [1];  [1];  [1]
  1. Tokamak Energy Ltd., Abingdon (United Kingdom)
  2. Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
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Following successful campaigns on the compact high field spherical tokamak ST40, resistive gold foil bolometers have now been installed to measure the radiated power profile. Positioned on the midplane, two bolometer cameras offer perspectives of the horizontal and vertical planes, while the third camera, situated above the midplane, provides a vertical view of the top divertor plates, including the X-point and the strike points. Further, these cameras use a commercial off-the-shelf data acquisition platform with modules specifically designed for bolometers in a Wheatstone bridge configuration, providing both phase sensitive detection and in situ calibration. This paper presents an overview of the design and functionality of all three cameras and the commissioning of the horizontal plane camera. The commissioning of the horizontal camera shows data from a range of plasma pulses, presenting a positive correlation between the relative profiles measured from the bolometer camera and an absolute extreme ultraviolet diode camera viewing along similar lines of sight.
Research Organization:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
Sponsoring Organization:
USDOE Office of Science (SC)
Grant/Contract Number:
AC05-00OR22725
OSTI ID:
2447289
Journal Information:
Review of Scientific Instruments, Journal Name: Review of Scientific Instruments Journal Issue: 8 Vol. 95; ISSN 0034-6748
Publisher:
American Institute of Physics (AIP)Copyright Statement
Country of Publication:
United States
Language:
English

References (8)

Upgraded bolometer system on JET for improved radiation measurements journal October 2007
A low noise highly integrated bolometer array for absolute measurement of VUV and soft x radiation journal March 1991
Derivation of bolometer equations relevant to operation in fusion experiments journal September 2002
A novel carbon coating technique for foil bolometers journal August 2016
An FPGA-based bolometer for the MAST-U Super-X divertor journal August 2016
RADCAM—A radiation camera system combining foil bolometers, AXUV diodes, and filtered soft x-ray diodes journal November 2022
Overview and first measurements of the MAST Upgrade bolometer diagnostic journal February 2023
Achievement of ion temperatures in excess of 100 million degrees Kelvin in the compact high-field spherical tokamak ST40 journal March 2023

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70 PLASMA PHYSICS AND FUSION TECHNOLOGY