The MOSS camera is a 16 channel high resolution spectrometer for time-resolved Doppler imaging of the plasma cross-section in the H-1NF heliac . The camera is an extension of the MOSS concept to accommodate multiple spatial channels. Using frequency domain multiplexing techniques, it is possible to capture the essential spectroscopic information using a single detector per spatial channel. This opens the possibility of truly two-dimensionsal, time-resolved spectroscopic imaging using a single high-throughput camera.
The photograph shows a 16 channel camera installed on the H-1NF heliac. The optics on the left rail are used for calibration purposes. The rightmost rail carries the camera, including imaging optics, polarizers, filters and electrooptics. A picture of a 64 element detector array and associated preamps can be found here
MOSS camera image of the temporal evolution of the ion temperature during a 80kW 7MHz rf argon discharge in H-1NF at 0.2T. Note the strong edge heating, the time resolved ion-temperature evolution during confinement transitions and the strong temperature relaxation at the finish of the rf-pulse.
The associated intensity profile for this discharge is shown below. The sudden and pronounced changes in light emission intensity correspond with spontaneous changes in the internal electric field.
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