title: Physics design of the in-vessel collection optics for the ITER electron cyclotron emission diagnostic.
abstract: Measurement of the electron cyclotron emission (ECE) is one of the primary diagnostics for electron temperature in ITER. In-vessel, in-vacuum, and quasi-optical antennas capture sufficient ECE to achieve large signal to noise with microsecond temporal resolution and high spatial resolution while maintaining polarization fidelity. Two similar systems are required. One views the plasma radially. The other is an oblique view. Both views can be used to measure the electron temperature, while the oblique is also sensitive to non-thermal distortion in the bulk electron distribution. The in-vacuum optics for both systems are subject to degradation as they have a direct view of the ITER plasma and will not be accessible for cleaning or replacement for extended periods. Blackbody radiation sources are provided for in situ calibration.
authors.affiliation: Institute for Fusion Studies, The University of Texas at Austin, Austin, Texas 78712, USA.
authors.forename: W L
authors.initials: WL
authors.lastname: Rowan
authors.affiliation: Institute for Fusion Studies, The University of Texas at Austin, Austin, Texas 78712, USA.
authors.forename: S
authors.initials: S
authors.lastname: Houshmandyar
authors.affiliation: Institute for Fusion Studies, The University of Texas at Austin, Austin, Texas 78712, USA.
authors.forename: P E
authors.initials: PE
authors.lastname: Phillips
authors.affiliation: Institute for Fusion Studies, The University of Texas at Austin, Austin, Texas 78712, USA.
authors.forename: M E
authors.initials: ME
authors.lastname: Austin
authors.affiliation: Center for Electromechanics, The University of Texas at Austin, Austin, Texas 78712, USA.
authors.forename: J H
authors.initials: JH
authors.lastname: Beno
authors.affiliation: Plasma Science and Fusion Center, MIT, Cambridge, Massachusetts 02139, USA.
authors.forename: A E
authors.initials: AE
authors.lastname: Hubbard
authors.affiliation: Princeton Plasma Physics Laboratory, Princeton, New Jersey 08543, USA.
authors.forename: A
authors.initials: A
authors.lastname: Khodak
authors.affiliation: Center for Electromechanics, The University of Texas at Austin, Austin, Texas 78712, USA.
authors.forename: A
authors.initials: A
authors.lastname: Ouroua
authors.affiliation: Princeton Plasma Physics Laboratory, Princeton, New Jersey 08543, USA.
authors.forename: G
authors.initials: G
authors.lastname: Taylor