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Infrared Imaging Video Bolometers (IRVBs) are successfully being used to study the three dimensional impurity radiation distribution from the LHD plasma. IRVBs can serve as a promising diagnostic for studying the radiation structures of detached plasmas in LHD and hence a comparison can be established with theoretical models. A new IRVB system is being designed for the LHD bottom port for better access to the magnetic x-points and to study the 3D radiation structures. The design overview of this new IRVB system is discussed in this paper. The design includes spatial resolution, field of view of the IRVB, sensitivity and signal to noise estimates. Two optical configurations for an infrared periscope are discussed in brief and selection of a catadioptic configuration with a cassegrain telescope is justified. The sensitivity of the existing IRVBs is expected to increase 5 fold by the addition of this IR periscope.

Design Considerations for an Infrared Imaging Video Bolometer for Observation of 3D Radiation Structures of Detached LHD Plasmas