title: Optics design for J-TEXT ECE imaging with field curvature adjustment lens.
abstract: Significant progress has been made in the imaging and visualization of magnetohydrodynamic and microturbulence phenomena in magnetic fusion plasmas. Of particular importance has been microwave electron cyclotron emission imaging (ECEI) for imaging Te fluctuations. Key to the success of ECEI is a large Gaussian optics system constituting a major portion of the focusing of the microwave radiation from the plasma to the detector array. Both the spatial resolution and observation range are dependent upon the imaging optics system performance. In particular, it is critical that the field curvature on the image plane is reduced to decrease crosstalk between vertical channels. The receiver optics systems for two ECEI on the J-TEXT device have been designed to ameliorate these problems and provide good performance with additional field curvature adjustment lenses with a meniscus shape to correct the aberrations from several spherical surfaces.
authors.affiliation: School of Physics, University of Science and Technology of China, Anhui 230026, People's Republic of China.
authors.forename: Y
authors.initials: Y
authors.lastname: Zhu
authors.affiliation: School of Physics, University of Science and Technology of China, Anhui 230026, People's Republic of China.
authors.forename: Z
authors.initials: Z
authors.lastname: Zhao
authors.affiliation: School of Physics, University of Science and Technology of China, Anhui 230026, People's Republic of China.
authors.forename: W D
authors.initials: WD
authors.lastname: Liu
authors.affiliation: School of Physics, University of Science and Technology of China, Anhui 230026, People's Republic of China.
authors.forename: J
authors.initials: J
authors.lastname: Xie
authors.affiliation: University of California at Davis, Davis, California 95616, USA.
authors.forename: X
authors.initials: X
authors.lastname: Hu
authors.affiliation: University of California at Davis, Davis, California 95616, USA.
authors.forename: C M
authors.initials: CM
authors.lastname: Muscatello
authors.affiliation: University of California at Davis, Davis, California 95616, USA.
authors.forename: C W
authors.initials: CW
authors.lastname: Domier
authors.affiliation: University of California at Davis, Davis, California 95616, USA.
authors.forename: N C
authors.initials: NC
authors.lastname: Luhmann
authors.affiliation: University of California at Davis, Davis, California 95616, USA.
authors.forename: M
authors.initials: M
authors.lastname: Chen
authors.affiliation: University of California at Davis, Davis, California 95616, USA.
authors.forename: X
authors.initials: X
authors.lastname: Ren
authors.affiliation: Princeton Plasma Physics Laboratory, Princeton, New Jersey 08543, USA.
authors.forename: B J
authors.initials: BJ
authors.lastname: Tobias
authors.affiliation: College of Electrical and Electronic Engineering, Huazhong University of Science and Technology, Wuhan 430074, People's Republic of China.
authors.forename: G
authors.initials: G
authors.lastname: Zhuang
authors.affiliation: College of Electrical and Electronic Engineering, Huazhong University of Science and Technology, Wuhan 430074, People's Republic of China.
authors.forename: Z
authors.initials: Z
authors.lastname: Yang