[Table of Contents]

Plasma and Fusion Research

Volume 7, 2402095 (2012)

Regular Articles

Design Considerations for an Infrared Imaging Video Bolometer for Observation of 3D Radiation Structures of Detached LHD Plasmas
Shwetang N. PANDYA and Byron J. PETERSON1)
The Graduate University for Advance Studies, 322-6 Oroshi-cho, Toki 509-5292, Japan
1)
National Institute for Fusion Science, 322-6 Oroshi-cho, Toki 509-5292, Japan
(Received 9 December 2011 / Accepted 17 May 2012 / Published 26 July 2012)

Abstract

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.

Keywords

infrared imaging video bolometer, plasma detachment, divertor power load, 3D radiation structure, IRVB design, LHD plasma

DOI: 10.1585/pfr.7.2402095

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This paper may be cited as follows:

Shwetang N. PANDYA and Byron J. PETERSON, Plasma Fusion Res. 7, 2402095 (2012).