Abstract
Improved localization of emission and reduction of artefacts have been achieved in tomographic reconstructions of the tangentially viewing spectroscopic divertor cameras in JET by introducing the contribution of reflections from the metallic wall surfaces in the geometry definition of the tomography process. The reconstructions thus describe the plasma emission only without features arising from misinterpreted reflected light. Benchmarks with synthetic emission distributions showed accurate reproduction within 10% and 1-2% of the reference emission distributions and camera images, respectively, when the reflection correction was applied. Without the correction, the reconstructed emission was observed to concentrate from the divertor volume towards the wall surfaces together with bright emission artefacts appearing in front of the surfaces to reproduce the reflections seen in the camera images.
| Original language | English |
|---|---|
| Article number | C10013 |
| Journal | Journal of Instrumentation |
| Volume | 14 |
| Issue number | 10 |
| DOIs | |
| State | Published - Oct 2019 |
Funding
This work has been carried out within the framework of the EUROfusion Consortium and has received funding from the Euratom research and training programme 2014-2018 and 2019-2020 under grant agreement No 633053. The views and opinions expressed herein do not necessarily reflect those of the European Commission.
Keywords
- Nuclear instruments and methods for hot plasma diagnostics
- Plasma diagnostics - high speed photography
- Plasma diagnostics - interferometry, spectroscopy and imaging
