Applicability of inverse heat flux evaluation to thermographic measurements in SPIDER

To study and optimize negative ion production, the SPIDER (Source for Production of Deuterium Extracted from RF plasma) prototype (beam energy 100keV, current 48A) is under construction in Padova, Italy. The instrumented calorimeter STRIKE (Short-Time Retractable Instrumented Kalorimeter Experiment)...

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Bibliographic Details
Published in:Fusion engineering and design 2017-11, Vol.123, p.268-275
Main Authors: Delogu, R.S., Pimazzoni, A., Serianni, G.
Format: Article
Language:English
Subjects:
Carbon fiber reinforced plastics
Carbon fibers
Deuterium
Divergence
Fiber composites
Heat conductivity
Heat flux
Infrared cameras
Infrared radiation
Inverse heat flux
Ion beams
Linearity
Negative ions
Neutral beam
Nonlinearity
Plasma physics
SPIDER
STRIKE
Thermographic measurements
Thermography
Tiles
Transfer functions
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Summary:To study and optimize negative ion production, the SPIDER (Source for Production of Deuterium Extracted from RF plasma) prototype (beam energy 100keV, current 48A) is under construction in Padova, Italy. The instrumented calorimeter STRIKE (Short-Time Retractable Instrumented Kalorimeter Experiment) has been designed with the main purpose of characterizing the SPIDER negative ion beam in terms of beam uniformity and divergence during short pulse operations. STRIKE is made of 16 1D Carbon Fibre Composite (CFC) tiles, intercepting the whole beam and observed on the rear side by infrared (IR) cameras. As the front observation is not convenient, it is necessary to solve an inverse non-linear problem to determine the energy flux profile impinging on the calorimeter, starting from the 2D temperature pattern measured on the rear side of the tiles. The aim of the paper is to give an overview about the transfer function technique which may be used to retrieve the flux profile, dealing with non-linearity and non-stationariness.
ISSN:0920-3796
1873-7196
DOI:10.1016/j.fusengdes.2017.05.065