29th Symposium on Fusion Technology (SOFT 2016)

P4.039 Inverse heat flux evaluation from thermographic measurements in SPIDER

8 Sep 2016, 14:20

1h 40m

Foyer 2A (2nd floor), 3A (3rd floor) (Prague Congress Centre)

Board: 39

Poster B. Plasma Heating and Current Drive P4 Poster session

Speaker

R.S. Delogu (Consorzio RFX)

Description

To study and optimize negative ion production, the SPIDER prototype (beam energy 100 keV, current 48 A) 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 different techniques which may be used to retrieve the flux profile, dealing with non-linearity and focusing in particular on the image filtering, which have demonstrated to be a very significant parameter.