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SUMMARY:Performance of the BGO endcap calorimeter of the CMD-3 detector
DTSTART;VALUE=DATE-TIME:20140228T025000Z
DTEND;VALUE=DATE-TIME:20140228T031000Z
DTSTAMP;VALUE=DATE-TIME:20261014T225034Z
UID:indico-contribution-95@indico.inp.nsk.su
DESCRIPTION:Speakers: Ravel Akhmetshin (Budker Institute of Nuclear Physic
 s)\nThe BGO endcap calorimeter was successfully operated in the CMD-2 dete
 ctor at the VEPP-2M collider. It consists of 680 BGO crystals each with a 
 size of 25×25×150 mm³\, arranged in two identical endcaps\, with a tota
 l crystal weight of 450 kg. The light readout used vacuum phototriodes. Th
 e endcap calorimeter has now been upgraded to work in the CMD-3 detector a
 t new collider VEPP-2000. The major part of the endcap calorimeter\, the B
 GO crystals\, remains the same. The main upgrade is the use of silicon PIN
  photodiodes and new electronics. Main reason to change photosensitive dev
 ice is the strong non-uniform magnetic field in the endcap calorimeter vol
 ume and redused available space. The Hamamatsu PIN photodiode S3590-08 was
  chosen as the optimal solution\, as they are insensitive to magnetic fiel
 ds and are both compact and stable. An order of magnitude larger capacitan
 ce of silicon photodiodes requires design and produce new custom electroni
 cs. The upgrade is expected to bring an overall improvement of parameters.
  The endcap calorimeter has been installed in the detector and participate
 s in data taking which started at 2010. The preliminary energy resolution 
 is measured in the energy range 160-1000 MeV. It is better compare to the 
 CMD-2 detector.\n\nhttps://indico.inp.nsk.su/event/0/contributions/95/
LOCATION:
URL:https://indico.inp.nsk.su/event/0/contributions/95/
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