Demonstration of improvement in 2D tomographic reconstructions of filtered cameras in the JET ITER-like wall divertor due to corrected interpretation of reflections

Research output: Contribution to journalArticle

Researchers

Research units

  • Culham Sci Ctr, Culham Science Centre, CCFE
  • Oak Ridge Natl Lab, Oak Ridge National Laboratory, United States Department of Energy (DOE)
  • Univ Lisbon, Universidade de Lisboa, Inst Super Tecn, Inst Plasmas & Fusao Nucl
  • Forschungszentrum Jülich

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.

Details

Original languageEnglish
Article number10013
Number of pages8
JournalJournal of Instrumentation
Volume14
Publication statusPublished - Oct 2019
MoE publication typeA1 Journal article-refereed
EventEuropean Conference on Plasma Diagnostics - Lisbon, Portugal
Duration: 6 May 201910 May 2019
Conference number: 3

    Research areas

  • Nuclear instruments and methods for hot plasma diagnostics, Plasma diagnostics - high speed photography, Plasma diagnostics - interferometry, spectroscopy and imaging

ID: 40177913