ECE Imaging on HL-2A
UC Davis is fabricating a 24x8 channel electron cyclotron emission imaging (ECEI) system for the Center for Fusion Science of the Southwestern Institute of Physics (SWIP) for use on the HL-2A tokamak in China (see Fig. 1). The estimated installation date of the ECEI system is Dec. 1, 2012.
Fig. 1 Photograph of HL-2A
The system is comprised of a front-end 24 channel imaging array with a tunable RF range spanning 90 to 135 GHz, and a set of back-end ECEI electronics that together generate 24x8 = 192 channel images of the 2nd harmonic X-mode ECE radiation emitted from the HL-2A plasma. Each channel corresponds to the received ECE power at a specific input frequency on a specific imaging array element, with an RF bandwidth of ~600 MHz, and a video bandwidth that can be remotely adjusted between 50 and 400 kHz. RF channel spacing, which determines the radial spacing between channels, is user-selectable between 600 and 900 MHz to match the ECEI radial coverage to particular physics experiments on HL-2A. The result is a time-resolved 2-D image of Te profiles and Te fluctuations over an extended portion of the target plasma,
Comments to: Calvin Domier