title: In-vessel calibration of the imaging diagnostics for the real-time protection of the JET ITER-like wall.
abstract: The in situ absolute calibration of the JET real-time protection imaging system has been performed for the first time by means of radiometric light source placed inside the JET vessel and operated by remote handling. High accuracy of the calibration is confirmed by cross-validation of the near infrared (NIR) cameras against each other, with thermal IR cameras, and with the beryllium evaporator, which lead to successful protection of the JET first wall during the last campaign. The operation temperature ranges of NIR protection cameras for the materials used on JET are Be 650-1600 °C, W coating 600-1320 °C, and W 650-1500 °C.
authors.affiliation: Forschungszentrum Jülich GmbH, Supercomputing Centre, 52425 Jülich, Germany.
authors.forename: V
authors.initials: V
authors.lastname: Huber
authors.affiliation: Forschungszentrum Jülich GmbH, Institut für Energie- und Klimaforschung-Plasmaphysik, Partner of the Trilateral Euregio Cluster (TEC), 52425 Jülich, Germany.
authors.forename: A
authors.initials: A
authors.lastname: Huber
authors.affiliation: CCFE, Culham Science Centre, Abingdon OX14 3DB, United Kingdom.
authors.forename: D
authors.initials: D
authors.lastname: Kinna
authors.affiliation: CCFE, Culham Science Centre, Abingdon OX14 3DB, United Kingdom.
authors.forename: I
authors.initials: I
authors.lastname: Balboa
authors.affiliation: CCFE, Culham Science Centre, Abingdon OX14 3DB, United Kingdom.
authors.forename: S
authors.initials: S
authors.lastname: Collins
authors.affiliation: CCFE, Culham Science Centre, Abingdon OX14 3DB, United Kingdom.
authors.forename: N
authors.initials: N
authors.lastname: Conway
authors.affiliation: MPI für Plasmaphysik, Greifswald, Germany.
authors.forename: P
authors.initials: P
authors.lastname: Drewelow
authors.affiliation: CCFE, Culham Science Centre, Abingdon OX14 3DB, United Kingdom.
authors.forename: C F
authors.initials: CF
authors.lastname: Maggi
authors.affiliation: CCFE, Culham Science Centre, Abingdon OX14 3DB, United Kingdom.
authors.forename: G F
authors.initials: GF
authors.lastname: Matthews
authors.affiliation: CCFE, Culham Science Centre, Abingdon OX14 3DB, United Kingdom.
authors.forename: A G
authors.initials: AG
authors.lastname: Meigs
authors.affiliation: Forschungszentrum Jülich GmbH, Institut für Energie- und Klimaforschung-Plasmaphysik, Partner of the Trilateral Euregio Cluster (TEC), 52425 Jülich, Germany.
authors.forename: Ph
authors.initials: P
authors.lastname: Mertens
authors.affiliation: CCFE, Culham Science Centre, Abingdon OX14 3DB, United Kingdom.
authors.forename: M
authors.initials: M
authors.lastname: Price
authors.affiliation: Forschungszentrum Jülich GmbH, Institut für Energie- und Klimaforschung-Plasmaphysik, Partner of the Trilateral Euregio Cluster (TEC), 52425 Jülich, Germany.
authors.forename: G
authors.initials: G
authors.lastname: Sergienko
authors.affiliation: CCFE, Culham Science Centre, Abingdon OX14 3DB, United Kingdom.
authors.forename: S
authors.initials: S
authors.lastname: Silburn
authors.affiliation: York Plasma Institute, University of York, Heslington, York YO10 5DD, United Kingdom.
authors.forename: A
authors.initials: A
authors.lastname: Wynn
authors.affiliation: CCFE, Culham Science Centre, Abingdon OX14 3DB, United Kingdom.
authors.forename: K-D
authors.initials: KD
authors.lastname: Zastrow