BEGIN:VCALENDAR VERSION:2.0 PRODID:-//CERN//INDICO//EN BEGIN:VEVENT SUMMARY:The use of polychromatic synchrotron radiation to study fast proce sses in solids. Advantages and challenges. DTSTART;VALUE=DATE-TIME:20200714T080000Z DTEND;VALUE=DATE-TIME:20200714T082000Z DTSTAMP;VALUE=DATE-TIME:20260316T051723Z UID:indico-contribution-212-1017@indico.inp.nsk.su DESCRIPTION:Speakers: Boris Tolochko (Institute of solid state chemistry a nd mechanochemistry)\nTheoretical analysis has been carried out and test e xperiments have been implemented on the use of polychromatic synchrotron r adiation to study fast processes in solids. The obvious benefits and chall enges are outlined.\n\nhttps://indico.inp.nsk.su/event/24/contributions/10 17/ LOCATION: Zoom 890 9721 5207 URL:https://indico.inp.nsk.su/event/24/contributions/1017/ END:VEVENT BEGIN:VEVENT SUMMARY:Status of the studies of thermal stresses and deformations in mate rials caused by pulsed heat loads in BINP DTSTART;VALUE=DATE-TIME:20200714T082000Z DTEND;VALUE=DATE-TIME:20200714T084000Z DTSTAMP;VALUE=DATE-TIME:20260316T051723Z UID:indico-contribution-212-1842@indico.inp.nsk.su DESCRIPTION:Speakers: Aleksey Arakcheev ()\nThe operation of fusion reacto r on the base of tokamak geometry of magnetic field is expected to be acco mpanied by pulsed heat loads to divertor. The loads lead to formation of p lastic deformations and residual mechanical stresses. The stresses may res ult in mechanical destruction of tungsten armor of divertor. Typically it appears as a crack formation. The cracks decreases the heat removal from t he surface\, spoils the geometry of plasma flow to divertor\, make easier the formation and ejection of micro particles\, etc. The optical and X-ray diagnostics are applied to studies of the stresses and deformations in tu ngsten caused by pulsed heat loads in Budker Institute.\nThe optical diagn ostics are applied at the facility BETA (Beam of Electrons for material Te st Application). The measuring of thermal radiation and scattered on the s urface laser radiation during pulsed heating gives information about the s urface temperature\, roughness and curvature of the surface\, etc. Among t he most significant discoveries made using these diagnostics\, we can note the detection of a delay between the end of the pulse heating and the for mation of cracks by several orders of magnitude compared to the expected v alues. Recently\, a new optical diagnostic has been developed\, which allo ws determining the radius of curvature of the surface by changing the foca l length. The results of the diagnostics confirmed the previous results on the delay. In addition\, measuring the dynamics of surface curvature allo ws calculating the distribution of deformations and stresses along the dep th of the sample. Of course\, the results of such calculations depend on t he applied strain models.\nThe more direct methods for measuring residual stresses are used at stations of X-ray scattering «Precision diffractomet ry and anomalous scattering» and «Diffraction "movie"» at the VEPP-3 so urce of synchrotron radiation. The residual stresses may be calculated usi ng the dependence of the scattering angle on the inclination of the sample . The station «Precision diffractometry and anomalous scattering» was us ed to make measurements of residual stresses with the spatial distribution s. The decreasing of residual stress during slow heating simulating the re sult of continual heating of divertor was measured at the station «Diffra ction "movie"».\nThe station of X-ray radiation «Plasma» at the VEPP-4 source of synchrotron radiation is oriented to measurements of deformation s and mechanical stresses in during pulsed heating simulating by laser rad iation. The previous experiments demonstrated the possibility of the measu rements of the depth distribution of deformations in single-crystal tungst en with the time resolution about 10 μs. The first demonstrative experime nts on the measurements of the diffraction on polycrystall tungsten were c arried out. The acceptable magnitude of signal were measured with the whol e exposure 150 ms. The time resolution is admissible for measurements of the dynamic of the stress between the pulsed heating and crack formation.\ n\nhttps://indico.inp.nsk.su/event/24/contributions/1842/ LOCATION: Zoom 890 9721 5207 URL:https://indico.inp.nsk.su/event/24/contributions/1842/ END:VEVENT BEGIN:VEVENT SUMMARY:Two stage shock wave processes in construction materials DTSTART;VALUE=DATE-TIME:20200714T070000Z DTEND;VALUE=DATE-TIME:20200714T073000Z DTSTAMP;VALUE=DATE-TIME:20260316T051723Z UID:indico-contribution-212-1910@indico.inp.nsk.su DESCRIPTION:Speakers: Evgeniy Smirnov (Russian Federal Nuclear Center - VN IITF)\nhttps://indico.inp.nsk.su/event/24/contributions/1910/ LOCATION: Zoom 890 9721 5207 URL:https://indico.inp.nsk.su/event/24/contributions/1910/ END:VEVENT BEGIN:VEVENT SUMMARY:Status of detonation experimentat VEPP-3/VEPP-4 DTSTART;VALUE=DATE-TIME:20200714T073000Z DTEND;VALUE=DATE-TIME:20200714T080000Z DTSTAMP;VALUE=DATE-TIME:20260316T051723Z UID:indico-contribution-212-1911@indico.inp.nsk.su DESCRIPTION:Speakers: Edward Pruuel ()\nhttps://indico.inp.nsk.su/event/24 /contributions/1911/ LOCATION: Zoom 890 9721 5207 URL:https://indico.inp.nsk.su/event/24/contributions/1911/ END:VEVENT BEGIN:VEVENT SUMMARY:Complex Dynamic Study of ejection of the of Particles from Shock-L oaded Tin by SR methods\, a PDV laser complex\, and optical and piezoelect ric sensors. DTSTART;VALUE=DATE-TIME:20200714T084000Z DTEND;VALUE=DATE-TIME:20200714T090000Z DTSTAMP;VALUE=DATE-TIME:20260316T051723Z UID:indico-contribution-212-1029@indico.inp.nsk.su DESCRIPTION:Speakers: Konstantin Ten (LIH SB RAS)\nAt fast acceleration of metals\, a cloud of microparticles (dust cloud) appears in front of the s urface. Work on the study of these processes using Synchrotron Radiation ( SR) was carried out at the Budker Institute of Nuclear Physics (Novosibirs k) [1\,2]. \nIn this work\, the particle flux from shock-loaded tin was recorded using X-ray radiography\, but also synchronously with another 4-c hannel Photon Doppler Velocimetry (PDV) laser complex and piezoelectric se nsors. \nThe use of piezosensors and laser complexes PDV is widely used due to the availability and simplicity of obtaining information on the dyn amic flows of microparticles. It is advisable to use these techniques in c onjunction with other techniques that can evaluate mass and flow rates. Th e use of SR radiography is an ideal complement to them. Comparison of data on the flow of microparticles (speed and mass distributions) with the mag nitude of the signal from the piezoelectric sensor makes it possible to in dependently calibrate the sensor readings. The simultaneous use of modern techniques has allowed not only to measure the mass distribution along the cloud\, but also significantly increase the reliability of the measured v alues. \nThe flows of microparticles from grooves (roughnesses) with siz es from Rz4 to Rz80 made on the surface of tin were investigated. The shoc k wave was created by pressed octogen. The data obtained are necessary for the numerical simulation of particle ejection processes. \n \n1\\. K.A . Ten\, E.R. Pruuel\, A.O. Kashkarov\, I.A. Rubtsov\, M.V. Antipov\, A.B. Georgievskaya\, A.L. Mikhailov\, I.A. Spirin\, V.M. Aulchenko\, L.I. Shekh tman\, V.V. Zhulanov\, B.P. Tolochko . Detection of Particle Ejection from Shock-Loaded Metals by Synchrotron Radiation Methods. // Combustion\, Exp losion\, and Shock Waves. Vol. 54. No. 5. pp. 606-613\, 2018. \n2\\. K A Ten\, E R Pruuel\, A O Kashkarov\, I A Rubtsov\, M V Antipov\, A B Georgi evskaya\, A L Mikhailov\, I A Spirin\, L I Shekhtman\, V V Zhulanov and B P Tolochko. Dynamic registration of ejection from shock-loaded metals // J ournal of Physics: Conference Series\, Volume 1147\, (2019) 012020 doi:10. 1088/1742-6596/1147/1/012020\n\nhttps://indico.inp.nsk.su/event/24/contrib utions/1029/ LOCATION: Zoom 890 9721 5207 URL:https://indico.inp.nsk.su/event/24/contributions/1029/ END:VEVENT BEGIN:VEVENT SUMMARY:Detectors for fast time-resolved studies at SSTRC\, status and fut ure DTSTART;VALUE=DATE-TIME:20200714T090000Z DTEND;VALUE=DATE-TIME:20200714T092000Z DTSTAMP;VALUE=DATE-TIME:20260316T051723Z UID:indico-contribution-212-1778@indico.inp.nsk.su DESCRIPTION:Speakers: Lev Shekhtman ()\nThe detector developments for fast and super-fast time-resolved studies at SR beams will be reviewed. Two de tectors based on Si micro-strip technology are developed at present at Bud ker INP SB RAS. The detector for imaging of super-fast processes at a nano second scale\, DIMEX-Si allows to improve by more than a factor of ten max imum detected photon flux\, with respect to the gaseous version of such de tector\, that is operating at VEPP-3 for more than 15 years\; the frame ra te is increased up to 50 MFr/s and spatial resolution is improved to about 50 microns. The new full-size detector prototype for the studies of tungs ten deformations under pulse heat load in a microsecond scale is recently developed. Its has significantly better spatial resolution and sensitivity compared to the DIMEX-G detector that was used for these studies before. \n\nPart of the work reviewed in this presentation related to the measurem ents with the prototype of the DIMEX-Si detector is supported by the RFBR grant No.19-42-540006.\n\nhttps://indico.inp.nsk.su/event/24/contributions /1778/ LOCATION: Zoom 890 9721 5207 URL:https://indico.inp.nsk.su/event/24/contributions/1778/ END:VEVENT END:VCALENDAR