title: Development of electron cyclotron emission imaging system on the HL-2A tokamak.
abstract: A 2D electron cyclotron emission imaging (ECEI) system has been developed for measurement of electron temperature fluctuations in the HL-2A tokamak. It is comprised of a front-end 24 channel heterodyne imaging array with a tunable RF range spanning 75-110 GHz, and a set of back-end ECEI electronics that together generate 24 × 8 = 192 channel images of the 2nd harmonic X-mode electron cyclotron emission from the HL-2A plasma. The simulated performance of the local oscillator (LO) optics and radio frequency (RF) optics is presented, together with the laboratory characterization results. The Gaussian beams from the LO optics are observed to properly cover the entire detector array. The ECE signals from the plasma are mixed with the LO signal in the array box, then delivered to the electronics system by low-loss microwave cables, and finally to the digitizers. The ECEI system can achieve temporal resolutions of ~μs, and spatial resolutions of 1 cm (radially) and 2 cm (poloidally).
authors.affiliation: Southwestern Institute of Physics, P. O. Box 432, Chengdu 610041, China.
authors.forename: M
authors.initials: M
authors.lastname: Jiang
authors.forename: Z B
authors.initials: ZB
authors.lastname: Shi
authors.forename: S
authors.initials: S
authors.lastname: Che
authors.forename: C W
authors.initials: CW
authors.lastname: Domier
authors.forename: N C
authors.initials: NC
authors.lastname: Luhmann
authors.forename: X
authors.initials: X
authors.lastname: Hu
authors.forename: A
authors.initials: A
authors.lastname: Spear
authors.forename: Z T
authors.initials: ZT
authors.lastname: Liu
authors.forename: X T
authors.initials: XT
authors.lastname: Ding
authors.forename: J
authors.initials: J
authors.lastname: Li
authors.forename: W L
authors.initials: WL
authors.lastname: Zhong
authors.forename: W
authors.initials: W
authors.lastname: Chen
authors.forename: Y L
authors.initials: YL
authors.lastname: Che
authors.forename: B Z
authors.initials: BZ
authors.lastname: Fu
authors.forename: Z Y
authors.initials: ZY
authors.lastname: Cui
authors.forename: P
authors.initials: P
authors.lastname: Sun
authors.forename: Y
authors.initials: Y
authors.lastname: Liu
authors.forename: Q W
authors.initials: QW
authors.lastname: Yang
authors.forename: X R
authors.initials: XR
authors.lastname: Duan