[Table of Contents]

Plasma and Fusion Research

Volume 7, 2402089 (2012)

Regular Articles

Development of Infrared Imaging Video Bolometer for the ADITYA Tokamak
Santosh P. PANDYA, Shwetang N. PANDYA, Zubin SHAIKH, Shamsuddin SHAIKH, Jagannathan GOVINDARAJAN and ADITYA Team
Institute for Plasma Research, Bhat Village, Gandhinagar-382428, India
(Received 10 December 2011 / Accepted 7 May 2012 / Published 26 July 2012)

Abstract

The Infrared Imaging Video Bolometer (IRVB) is one of the modern plasma imaging diagnostics which provides the measurement of the temporally as well as spatially resolved (2-D/3-D) power profile radiated from plasma devices. The technique has successfully been tested on a large size tokamak (JT-60U) and the same technique is for the first time being utilized for the medium size tokamak ADITYA (R = 75 cm, a = 25 cm, Ip = 80 kA, Te(0) ∼ 350 eV, ⟨Ne⟩ ∼ 1.5 × 1013 cm3, BT = 0.7 T), where the plasma shot duration is ∼ 100 ms and radiated power brightness level is ∼ 2 W/cm2 . The diagnostic is utilizing a 6.4 cm × 6.4 cm size and 2.5 µm thick, free standing Platinum foil. A square aperture 0.7 × 0.7 cm2 of pinhole camera geometry can provide 9 × 9 bolometer pixel arrays (81 channels) and ∼ 7 cm of spatial resolution at plasma mid-plane with a 45° × 45° wide field of view. This wide field of view covers two semi-tangential views, on either side of the radial view in the tokamak along with a poloidal view. A medium wave infrared camera having 320 × 240 focal plane array, 200 Hz frame rate, noise equivalent temperature difference ∼ 20 mK is used and 10 ms of optimal temporal resolution is experimentally achieved. The present paper discusses the design, development and calibration of the system. The performance of the IRVB system for its time response is experimentally investigated and has also been reported here.

Keywords

infrared imaging video bolometer, bolometry, plasma diagnostic, tokamak, total radiated power loss

DOI: 10.1585/pfr.7.2402089

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This paper may be cited as follows:

Santosh P. PANDYA, Shwetang N. PANDYA, Zubin SHAIKH, Shamsuddin SHAIKH, Jagannathan GOVINDARAJAN and ADITYA Team, Plasma Fusion Res. 7, 2402089 (2012).