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SUMMARY:Current status of the studies of X-ray diffraction on tungsten dur
 ing pulsed heat loads at the scattering station «Plasma» at the VEPP-4 s
 ource of synchrotron radiation
DTSTART;VALUE=DATE-TIME:20200713T143100Z
DTEND;VALUE=DATE-TIME:20200713T143200Z
DTSTAMP;VALUE=DATE-TIME:20260419T050836Z
UID:indico-contribution-1868@indico.inp.nsk.su
DESCRIPTION:Speakers: Sergey Kazantsev (Budker Institute of Nuclear Physic
 s)\nFusion plasma confinement at facilities based on a tokamak geometry of
  the magnetic field includes periodical transient heat loads to divertor p
 lates. The divertor plates of ITER are seem to be covered by polycrystalli
 ne tungsten. The tungsten tends to crack in case of the pulsed heating. Th
 e reasons of the crack formation are deformations and mechanical stresses 
 caused by the sharp rise in temperature of thin surface layer. The X-ray s
 cattering station «Plasma» at the beamline 8 at the VEPP-4M source of sy
 nchrotron radiation was developed for dynamical measurements of deformatio
 ns and mechanical stresses in tungsten during pulsed heating simulating by
  laser radiation. First results were carried out on the mosaic single-crys
 tal tungsten. The observed evolution of the diffraction peak shape agrees 
 with theoretical predictions based on calculations of deformation caused b
 y pulsed heating. Deconvolution of the residual stress distribution show g
 ood agreement with theoretical model of distribution of the deformations i
 n thin surface layer in the sample during pulsed heating. One of the most 
 important cases was the observation of the bifurcation of the diffraction 
 peak during the occurrence of the crack on the sample during sequential re
 peated irradiations of the sample. Moreover\, the first experiments on the
  measurements of the diffraction on polycrystalline tungsten were carried 
 out.\n\nhttps://indico.inp.nsk.su/event/24/contributions/1868/
LOCATION:
URL:https://indico.inp.nsk.su/event/24/contributions/1868/
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