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SUMMARY:Micro-channel plates in ionisation mode as a fast timing device fo
 r future hadron colliders
DTSTART;VALUE=DATE-TIME:20170302T110000Z
DTEND;VALUE=DATE-TIME:20170302T112000Z
DTSTAMP;VALUE=DATE-TIME:20260712T000901Z
UID:indico-contribution-1753@indico.inp.nsk.su
DESCRIPTION:Speakers: Alexander Barnyakov (BINP\, NSU\, NSTU)\nFuture high
  rate hadron colliders are expected to have hundreds of concurrent proton-
 proton interactions in the same bunch crossing\, deteriorating the reconst
 ruction of the hard scattering event and the identification of calorimeter
 s. The possibility to distinguish neutral particles coming from different 
 interaction vertices is being pursued as a tool to reduce pile-up contamin
 ation in calorimeters\, and restore optimal performance. At the high lumin
 osity LHC (HL-LHC) about 200 concurrent interactions are expected\, with a
  spread between the interaction vertices of few centimeters in the beam di
 rection and 200ps in the collision time. A time of flight resolution of th
 e order of 30 ps would be able to reduce neutral particles pile-up contami
 nation at the calorimeter level of about one order of magnitude\, restorin
 g pile-up conditions similar to what is routinely sustained in the current
  run of the LHC. Micro-channel plates have been used in PMT configuration 
 as fast charged particles detector (resolution of better than 20 ps have b
 een achieved with commercial devices)\, however they are not particularly 
 radiation tolerant\, mostly due to the ion feedback on the photocathode. T
 he possibility of using micro-channel plates without a photocathode (i-MCP
 ) has been studied in several test beams. Different MCP geometries are com
 pared with the goal to identify the optimal configuration. Efficiency of m
 ore then 70% with a time resolution of better than 40 ps are achieved for 
 single charged particles\, leading to an efficiency close to 100% for EM s
 hower after few radiation lengths. This open the possibility to use i-MCPs
  as a timing layer in a sampling calorimeter or to use it in a pre-shower 
 device independent from the calorimeter technology.\n\nhttps://indico.inp.
 nsk.su/event/8/contributions/1753/
LOCATION:
URL:https://indico.inp.nsk.su/event/8/contributions/1753/
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