title: A frequency tunable, eight-channel correlation ECE system for electron temperature turbulence measurements on the DIII-D tokamak.
abstract: A new eight-channel correlation electron cyclotron emission diagnostic has recently been installed on the DIII-D tokamak to study both turbulent and coherent electron temperature fluctuations under various plasma conditions and locations. This unique system is designed to cover a broad range of operation space on DIII-D (1.6-2.1 T, detection frequency: 72-108 GHz) via four remotely selected local oscillators (80, 88, 96, and 104 GHz). Eight radial locations are measured simultaneously in a single discharge covering as much as half the minor radius. In this paper, we present design details of the quasi-optical system, the receiver, as well as representative data illustrating operation of the system.
authors.affiliation: Department of Physics and Astronomy, University of California, Los Angeles, California 90098, USA.
authors.forename: C
authors.initials: C
authors.lastname: Sung
authors.affiliation: Department of Physics and Astronomy, University of California, Los Angeles, California 90098, USA.
authors.forename: W A
authors.initials: WA
authors.lastname: Peebles
authors.affiliation: Department of Physics and Astronomy, University of California, Los Angeles, California 90098, USA.
authors.forename: C
authors.initials: C
authors.lastname: Wannberg
authors.affiliation: Department of Physics and Astronomy, University of California, Los Angeles, California 90098, USA.
authors.forename: T L
authors.initials: TL
authors.lastname: Rhodes
authors.affiliation: Department of Physics and Astronomy, University of California, Los Angeles, California 90098, USA.
authors.forename: X
authors.initials: X
authors.lastname: Nguyen
authors.affiliation: Department of Physics and Astronomy, University of California, Los Angeles, California 90098, USA.
authors.forename: R
authors.initials: R
authors.lastname: Lantsov
authors.affiliation: Department of Physics and Astronomy, University of California, Los Angeles, California 90098, USA.
authors.forename: L
authors.initials: L
authors.lastname: Bardóczi