title: In situ calibration of an infrared imaging video bolometer in the Large Helical Device.
abstract: The InfraRed imaging Video Bolometer (IRVB) is a powerful diagnostic to measure multi-dimensional radiation profiles in plasma fusion devices. In the Large Helical Device (LHD), four IRVBs have been installed with different fields of view to reconstruct three-dimensional profiles using a tomography technique. For the application of the measurement to plasma experiments using deuterium gas in LHD in the near future, the long-term effect of the neutron irradiation on the heat characteristics of an IRVB foil should be taken into account by regular in situ calibration measurements. Therefore, in this study, an in situ calibration system was designed.
authors.affiliation: National Institute for Fusion Science, 322-6 Oroshi-cho, Toki 509-5292, Japan.
authors.forename: K
authors.initials: K
authors.lastname: Mukai
authors.affiliation: National Institute for Fusion Science, 322-6 Oroshi-cho, Toki 509-5292, Japan.
authors.forename: B J
authors.initials: BJ
authors.lastname: Peterson
authors.affiliation: The Graduate University for Advance Studies, 322-6 Oroshi-cho, Toki 509-5292, Japan.
authors.forename: S N
authors.initials: SN
authors.lastname: Pandya
authors.affiliation: The Graduate University for Advance Studies, 322-6 Oroshi-cho, Toki 509-5292, Japan.
authors.forename: R
authors.initials: R
authors.lastname: Sano