Validating fast-ion wall-load IR analysis-methods against W7-X NBI empty-torus experiment

O. Asunta, W7-X Team

Research output: Contribution to journalArticleScientificpeer-review


The first neutral beam injection (NBI) experiments in Wendelstein 7-X (W7-X) stellarator were conducted in the summer of 2018. The NBI system is used to heat the magnetically confined plasma by neutralising an accelerated hydrogen ion beam and directing it into the plasma, where the resulting energetic ions release their energy to heat the plasma. The modelling of the NBI fast ion experiments has commenced, including estimation of the shine-through and the orbit-losses. The stellarator has a wide-angle infra red (IR) imaging system to monitor the machine plasma facing component surface temperatures. This work validates the NBI model "Beamlet Based NBI (BBNBI)" and the newly written synthetic IR camera model. The validation is accomplished by comparing the measured and the synthetic IR camera measurements of an experiment where the NBI was injected into the vacuum vessel without a plasma. A good qualitative and quantitative match was found. This agreement is further supported by spectroscopic and calibration measurements of the NBI and and IR camera systems.

Original languageEnglish
Article number07018
Pages (from-to)1-12
Number of pages14
JournalJournal of Instrumentation
Publication statusPublished - Jul 2019
MoE publication typeA1 Journal article-refereed


  • Simulation methods and programs
  • Plasma diagnostics - interferometry, spectroscopy and imaging
  • Plasma diagnostics - charged-particle spectroscopy


Dive into the research topics of 'Validating fast-ion wall-load IR analysis-methods against W7-X NBI empty-torus experiment'. Together they form a unique fingerprint.

Cite this