Abstract
An infrared imaging video bolometer (IRVB) is proposed for ITER having a tangential view of the entire ITER cross section. For the initial estimate of the signal level, a 840m3 plasma is assumed to uniformly radiate 67.3MW. A more detailed estimate of the signal strength is provided by synthetic images based on radiation data from SOLPS and SANCO models for the edge and core plasma, respectively. The Pt foil used as the radiation absorber would have the dimensions of 7 × 9cm2 and a thickness of 16 μm that will stop 95% of the radiated power. Two different InSb based IR cameras having a sensitivity of 15 mK are considered for measuring the temperature rise of the foil due to the radiation. The first has 1280 × 1024 pixel2 and a frame rate of 105fps. The second has 640 × 512 pixel2 and a frame rate of 1000fps. The resulting IRVBs have 40 × 30 pixel2, 10ms time resolution, and a signal to noise ratio (SNR) of 17 and 20 × 15 pixel2, 3ms time resolution, and a SNR of 35, respectively. The synthetic image data give SNRs of 30 and 59, respectively.
Highlights
The InfraRed imaging Video Bolometer (IRVB) [1,2]represents an alternative to resistive bolometers [3,4] for diagnosing the radiated power distribution in a fusion reactor such as ITER [5]
Modelling of JT-60SA [7] have demonstrated the ability of an IRVB with a tangential view to produce two-dimensional poloidal profiles of the radiated power based on the assumption of axis-symmetry
Previous work addressing an IRVB for ITER focused on the lines of sight (LOS) distribution for various IRVB locations
Summary
Represents an alternative to resistive bolometers [3,4] for diagnosing the radiated power distribution in a fusion reactor such as ITER [5]. The IRVB consists of an aperture collimated foil which absorbs broadband radiation from the plasma. Modelling of JT-60SA [7] have demonstrated the ability of an IRVB with a tangential view to produce two-dimensional poloidal profiles of the radiated power based on the assumption of axis-symmetry. Previous work addressing an IRVB for ITER focused on the lines of sight (LOS) distribution for various IRVB locations [8]. The placement of the IRVB in this paper is an idealized location which does not take into account any environmental constraints or ITER, in particular no restrictions from the space envelope available for implementing it
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