Computer simulation of charged fusion-product trajectories and detection efficiency expected for future experiments within the COMPASS tokamak

• Published in: Physica scripta Vol. T161; no. 1; pp. 14013 - 14017
• Main Authors: Kwiatkowski, Roch, Malinowski, Karol, Sadowski, Marek J
• Format: Journal Article
• Language: English
• Published: IOP Publishing 01.05.2014
• Subjects: computer simulation; fusion products; plasma diagnostics; tokamak plasma
• ISSN: 0031-8949; 1402-4896
• DOI: 10.1088/0031-8949/2014/T161/014013

This paper presents results of computer simulations of charged particle motions and detection efficiencies for an ion-pinhole camera of a new diagnostic system to be used in future COMPASS tokamak experiments. A probe equipped with a nuclear track detector can deliver information about charged products of fusion reactions. The calculations were performed with a so-called Gourdon code, based on a single-particle model and toroidal symmetry. There were computed trajectories of fast ions (> 500 keV) in medium-dense plasma (ne < 1014 cm−3) and an expected detection efficiency (a ratio of the number of detected particles to that of particles emitted from plasma). The simulations showed that charged fusion products can reach the new diagnostic probe, and the expected detection efficiency can reach 2 × 10−8. Based on such calculations, one can determine the optimal position and orientation of the probe. The obtained results are of importance for the interpretation of fusion-product images to be recorded in future COMPASS experiments.