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SUMMARY:Upgrade of the detector for imaging of explosions.
DTSTART;VALUE=DATE-TIME:20160706T050000Z
DTEND;VALUE=DATE-TIME:20160706T052000Z
DTSTAMP;VALUE=DATE-TIME:20260416T203958Z
UID:indico-contribution-1318@indico.inp.nsk.su
DESCRIPTION:Speakers: Lev Shekhtman (Budker Institute of Nuclear Physics)\
 nMethods of dynamic imaging of explosions at a synchrotron radiation (SR) 
 beam and small-angle X-ray scattering experiments with exploding samples a
 re being developed in the Siberian Synchrotron Radiation Center  (SSRC) at
  the Budker Institute of Nuclear Physics for more than fifteen years. The 
 detector for imaging of explosions (DIMEX) was developed for these purpose
 s and successfully operating at the beam line 0 at the VEPP-3 storage ring
  and at the beam line 8 at the VEPP-4M storage ring. The DIMEX is based on
  gas technology and allow to measure SR flux as a function of position and
  time with spatial resolution of $\\sim$200 $\\mu$m (FWHM)\, maximum frame
  rate of 2 MHz and  time resolution of $\\sim$80 ns. Maximum value of the 
 SR flux that can be measured by the present detector corresponds to $\\sim
 $5000 photons/(channel*bunch) (20 keV average energy\, channel area 0.1x0.
 5 mm$^2$\, bunch revolution frequency 4 MHz).  Maximum number of frames th
 at can be stored in the present detector is 32 and the number of channels 
 with 0.1 mm width  is 512. \n\nIn order to significantly improve the preci
 sion of data obtained by the DIMEX an upgrade of the detector has been sta
 rted. The electronics of the gaseous version of the detector has been chan
 ged such that the new detector is able to operate with frame rate of 8 MHz
  and store data in up to 100 frames. A new ASIC was developed for this pur
 pose called DMXG64A that includes 64 channels with low noise integrator an
 d 100 analogue memory cells in each channel. Input charge can be stored to
  and read out from analogue cells with maximum frequency of 10 MHz. The ot
 her parameters such as maximum measured SR flux\, spatial and time resolut
 ions are stay the same as in the old DIMEX. This new version of the detect
 or is called the DIMEX-G and is planned to be used at the VEPP-3 storage r
 ing and for SAXS studies at the VEPP-4M storage ring.\n\nFor imaging of ex
 plosions at the beam line 8 at the VEPP-4M storage ring\, where SR flux is
  expected to be about 100 times higher than at the VEPP-3\, a new detector
  based on Si micro-strip technology is being developed. Si micro-strip sen
 sors with special design in order to be able to measure very high X-ray fl
 ux\, are manufactured for us by Hamamatsu Photonics company. Each sensor c
 ontains 1024 30mm long strips with 50 $\\mu$m pitch. The sensor thickness 
 is 300 $\\mu$m and it will be positioned at an angle of 1.7 degrees with r
 espect to the SR beam plane in order to get effective Si thickness along t
 he beam close to 10 mm. The new detector called DIMEX-Si will have spatial
  resolution of 50 $\\mu$m (FWHM) and time resolution close to 10 ns. The n
 ew ASIC is under development for this project that will allow to operate w
 ith the frame rate of 50 MHz and record maximum charge that corresponds to
  the flux close to 10$^6$ photons/(chan*bunch)\, i.e. about 100 times high
 er than with present detector.\n\nhttps://indico.inp.nsk.su/event/3/contri
 butions/1318/
LOCATION:Budker INP Conference Hall
URL:https://indico.inp.nsk.su/event/3/contributions/1318/
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