The infrared imaging video bolometer at Wendelstein 7-X

Partesotti, G.; Wurden, G. A.; Reimold, F.; Peterson, B. J.; Federici, F.; Mukai, K.; Siever, K. A.; von Miller, J.; Zhang, D.; Demby, A.

doi:10.1063/5.0261413

The infrared imaging video bolometer at Wendelstein 7-X

Journal Article · Fri Jun 06 00:00:00 EDT 2025 · Review of Scientific Instruments

DOI:https://doi.org/10.1063/5.0261413· OSTI ID:2570028

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Max Planck Institute for Plasma Physics, Greifswald (Germany)
Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
National Institute for Fusion Science, Toki (Japan)
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
Univ. of Wisconsin, Madison, WI (United States)

The radiated power distribution is a crucial aspect of heat transport, heat load mitigation, and plasma exhaust performance. An imaging video bolometer camera has been installed to measure the plasma radiated power in the divertor region of the Wendelstein 7-X (W7-X) stellarator. This diagnostic offers a wide-angle (40° × 68°) sampling of the plasma volume in both the poloidal and toroidal directions. The field-of-view is covered with a large number (> 500) of bolometer channels, providing imaging capability. The diagnostic design is introduced here together with its data analysis procedure. A set of laboratory experiments is performed to assess the thermal properties of the gold absorber foil and their spatial uniformity. Following installation, a heat source originating from the inertially cooled front of the diagnostic is identified and filtered out. The discharge data indicate a satisfactory signal-to-noise ratio as well as spatiotemporal resolution. These represent the first toroidally resolved images of the line-integrated radiated power in the W7-X island divertor. The diagnostic was then upgraded with a thinner platinum absorber and adjusted mirrors. Early data from the most recent experimental campaign employing the upgraded design show a considerable improvement in the diagnostic performance with more bolometer channels (> 1400), extended coverage, and increased spatial resolution.

View Accepted Manuscript (DOE)

Research Organization:: Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)

Sponsoring Organization:: USDOE National Nuclear Security Administration (NNSA); USDOE Office of Science (SC), Fusion Energy Sciences (FES)

Grant/Contract Number:: 89233218CNA000001; AC05-00OR22725

OSTI ID:: 2570028

Report Number(s):: LA-UR--25-20780; 10.1063/5.0261413; 1089-7623

Journal Information:: Review of Scientific Instruments, Journal Name: Review of Scientific Instruments Journal Issue: 6 Vol. 96; ISSN 1089-7623; ISSN 0034-6748

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

Country of Publication:: United States

Language:: English

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