A fast model to resolve the velocity-space of fast-ion losses detected in ASDEX Upgrade and MAST Upgrade

ASDEX upgrade team, MAST upgrade team, MST1 team

Research output: Contribution to journalArticle

Abstract

A forward model to resolve the fast-ion loss velocity-space on a fast-ion loss detector (FILD) probe head (FILDSIM) has been extended, making it possible to perform real-time analysis of the FILD data ("real-time FILDSIM"). Parametric pre-processing with FILDSIM enables real-time mapping of the raw FILD measurements to the velocity-space of the fast-ion distribution reaching the FILD probe, which depends on the local magnetic field at the probe head. Such parametric pre-processing facilitates the study of fast-ion losses in stages of the discharge other than the flat-top, such as the ramp-up phase when changes in the local magnetic field at the probe head cannot be neglected. Real-time FILDSIM has been applied to the existing and newly installed FILDs in ASDEX Upgrade and will be used for the forthcoming FILD in MAST-Upgrade. Due to the larger size of the MAST-U FILD probe, the approximation used in FILDSIM of a uniform magnetic field in the FILD region has been generalised to the case of a non-uniform field, with gyro-orbits calculated numerically in this field.

Original languageEnglish
Article numberC09015
JournalJournal of Instrumentation
Volume14
Issue number9
DOIs
Publication statusPublished - Sep 11 2019

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Keywords

  • Data processing methods
  • Nuclear instruments and methods for hot plasma diagnostics
  • Particle identification methods
  • Scintillators, scintillation and light emission processes (solid, gas and liquid scintillators)

ASJC Scopus subject areas

  • Mathematical Physics
  • Instrumentation

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