Design and characterization of a prototype divertor viewing infrared video bolometer for NSTX-U
[1];
- Dutch Institute for Fundamental Energy Research, AJ Eindhoven (The Netherlands)
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
- National Institute for Fusion Science, Toki (Japan)
- Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
- National Institutes for Quantum and Radiological Science and Technology, Naka (Japan)
- Institute for Plasma Research, Gujarat (India)
The InfraRed Video Bolometer (IRVB) is a powerful tool to measure radiated power in magnetically confined plasmas due to its ability to obtain 2D images of plasma emission using a technique that is compatible with the fusion nuclear environment. A prototype IRVB has been developed and installed on NSTX-U to view the lower divertor. The IRVB is a pinhole camera which images radiation from the plasma onto a 2.5 μm thick, 9 × 7 cm2 Pt foil and monitors the resulting spatio-temporal temperature evolution using an IR camera. The power flux incident on the foil is calculated by solving the 2D+time heat diffusion equation, using the foil’s calibrated thermal properties. An optimized, high frame rate IRVB, is quantitatively compared to results from a resistive bolometer on the bench using a modulated 405 nm laser beam with variable power density and square wave modulation from 0.2 Hz to 250 Hz. The design of the NSTX-U system and benchtop characterization are presented where signal-to-noise ratios are assessed using three different IR cameras: FLIR A655sc, FLIR A6751sc, and SBF-161. The sensitivity of the IRVB equipped with the SBF-161 camera is found to be high enough to measure radiation features in the NSTX-U lower divertor as estimated using SOLPS modeling. The optimized IRVB has a frame rate up to 50 Hz, high enough to distinguish radiation during edge-localized-modes (ELMs) from that between ELMs.
- Research Organization:
- Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States); Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
- Sponsoring Organization:
- USDOE
- Grant/Contract Number:
- AC02-09CH11466; AC05-00OR22725
- OSTI ID:
- 1368686
- Alternate ID(s):
- OSTI ID: 1412066
- Journal Information:
- Review of Scientific Instruments, Vol. 87, Issue 11; ISSN 0034-6748
- Publisher:
- American Institute of Physics (AIP)Copyright Statement
- Country of Publication:
- United States
- Language:
- English
Web of Science
Experimental tests of an infrared video bolometer on Alcator C-Mod
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journal | October 2018 |
Plasma radiation studies in Magnum-PSI using resistive bolometry
|
journal | July 2018 |
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