BEGIN:VCALENDAR
VERSION:2.0
PRODID:-//CERN//INDICO//EN
BEGIN:VEVENT
SUMMARY:Study of the angular dependence of the emission of scintillator ma
 terials used in nuclear fusion devices
DTSTART;VALUE=DATE-TIME:20251119T144500Z
DTEND;VALUE=DATE-TIME:20251119T150000Z
DTSTAMP;VALUE=DATE-TIME:20260424T154123Z
UID:indico-contribution-29048@indico.ific.uv.es
DESCRIPTION:Speakers: Mauricio Rodriguez Ramos (University of Sevilla)\nSc
 intillator-based diagnostics\, such as Fast Ion Loss Detectors (FILD) [1] 
  and Ion-Neutral Particle Analyzers (INPA) [2]\, play a crucial role in ch
 aracterizing energetic particle behavior in magnetic confinement fusion de
 vices. These diagnostics rely on visible light emission induced by energet
 ic ion irradiation (ionoluminescence). A common assumption in theses diagn
 ostics is that light emission is isotropic [3]\; however\, this has not be
 en experimentally validated for materials of interest in fusion research. 
 In this work\, we present a study of the angular dependence of light emiss
 ion in two scintillator materials used in fusion diagnostics: TG-Green (Sr
 Ga₂S₄:Eu²⁺) and β-SiAlON (SiAlON). Experiments were conducted at t
 he 3 MV Tandem accelerator of the Centro Nacional de Aceleradores (CNA\, S
 eville)\, where samples were irradiated with 3.5 MeV He beams\, an energy 
 relevant to fusion applications. Light emission was collected through an o
 ptical fiber mounted on a rotating stage\, with the other end coupled to a
 n optical spectrometer. This configuration allowed measurements at differe
 nt observation angles with respect to the ion beam axis. Prior to the angu
 lar measurements\, we evaluated two potential sources of systematic error:
  the bending induced transmission loss in the optical fiber and the ion be
 am induced degradation of the scintillator. This ensured that any observed
  variation in light intensity with angle could be confidently attributed t
 o the emission anisotropy rather than to optical fiber bending or progress
 ive damage to the scintillator material. Preliminary results indicate meas
 urable variations in emission intensity with observation angle\, suggestin
 g that the isotropic emission assumption may require revision. Furthermore
 \, both scintillators exhibited gradual degradation in light output under 
 sustained ion exposure\, with material-dependent resilience. These finding
 s have direct implications for the calibration and interpretation of scint
 illator-based diagnostics in current devices and for the design of future 
 systems for ITER and other next-generation fusion reactors.\n\n(1) García
 -Muñoz\, M.\; Kocan\, M.\; Ayllon-Guerola\, J.\; Bertalot\, L.\; Bonnet\,
  Y.\; Casal\, N.\; Galdon\, J.\; García López\, J.\; Giacomin\, T.\; Gon
 zález-Martín\, J.\; Gunn\, J. P.\; Jiménez-Ramos\, M. C.\; Kiptily\, V.
 \; Pinches\, S. D.\; Rodríguez-Ramos\, M.\; Reichle\, R.\; Rivero-Rodríg
 uez\, J. F.\; Sanchis-Sánchez\, L.\; Snicker\, A.\; Vayakis\, G.\; Veshch
 ev\, E.\; Vorpahl\, Ch.\; Walsh\, M.\; Walton\, R. Rev. Sci. Instrum. 2016
 \, 87\, 11D829.\n(2) J. Rueda-Rueda\, M. Garcia-Munoz\, E. Viezzer\, P. A.
  Schneider\, J.Garcia-Dominguez\, J. Ayllon-Guerola\, J. Galdon-Quiroga\, 
 A. Herrmann\, X. Du\, M. A. Van Zeeland\, P. Oyola\, M. Rodriguez-Ramos\, 
 the ASDEX-Upgrade team.. Rev. Sci. Instrum. 2021\, 92\, 043554.\n(3) M Rod
 riguez-Ramos\, M Garcia-Munoz\, M C Jimenez-Ramos\, J Garcia Lopez\, J Gal
 don-Quiroga\, L Sanchis-Sanchez\, J Ayllon-Guerola\, M Faitsch\, J Gonzale
 z-Martin\, A Hermann\, P de Marne\, J F Rivero-Rodriguez\, B Sieglin\, A S
 nicker and the ASDEX Upgrade Team. Plasma Phys. Control. Fusion. 2017\, 59
 \, 105009.\n\nhttps://indico.ific.uv.es/event/8035/contributions/29048/
LOCATION:
URL:https://indico.ific.uv.es/event/8035/contributions/29048/
END:VEVENT
END:VCALENDAR