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SUMMARY:R&D status for an innovative crystal calorimeter for the future Mu
 on Collider
DTSTART;VALUE=DATE-TIME:20230907T142000Z
DTEND;VALUE=DATE-TIME:20230907T144000Z
DTSTAMP;VALUE=DATE-TIME:20260906T143252Z
UID:indico-contribution-2769@indico.tlabs.ac.za
DESCRIPTION:Speakers: Ivano Sarra (Istituto Nazionale di Fisica Nucleare -
  LNF)\nThe Crilin calorimeter is a semi-homogeneous calorimeter based on L
 ead Fluoride (PbF2) Crystals readout by surface-mount UV-extended Silicon 
 Photomultipliers (SiPMs). It is a proposed solution for the electromagneti
 c calorimeter of the future Muon Collider. A high granularity is required 
 in order to distinguish signal particles from the background and to solve 
 the substructures necessary for jet identification. Time of arrival measur
 ements in the calorimeter could play an important role\, since very large 
 occupancy due to beam-induced backgrounds is expected\, and the timing cou
 ld be used to identify energy depositions compatible with the expected muo
 n-muon interaction time. The calorimeter energy resolution is also fundame
 ntal to measure the kinematic properties of jets. Moreover\, the calorimet
 er should also operate in a very harsh radiation environment: 1 Mrad/year 
 total ionizing dose (TID) and a 10^14 neutron 1MeV/cm^2/year equivalent ne
 utrons fluence. Our radiation hardness studies on crystals and SiPMs\, hav
 e demonstrated we can work in this environment both for dose and neutron f
 luences.\nA dedicated test beam\, on single cell prototype (Proto-0)\, has
  been performed at CERN H2 in August 2022 with an electron energy of 120 G
 eV: a timing resolution better than 50 ps has been achieved for energy dep
 osits greater than 1 GeV. \nIn order to validate the design choices\, the 
 proposal is to build a larger prototype\, called Proto-1. The design has b
 een optimized with the simulation studies starting from dimensions of 0.7 
 R𝑀 and 8.5 X0 (∼ 0.3𝜆). This size comes from a compromise of an ac
 ceptable containment of 100 GeV electrons and cost constraints. Results wi
 ll be extrapolated to the optimum length of the Muon Collider calorimeter 
 of the order of 20 X0.\nThe proposal is to build Proto-1 with two layers o
 f 3 × 3 PbF2 crystals\, each read out with UV-extended SiPMs (Hamamatsu S
 14160-3010 PS SMD sensors) as already done in Proto-0. These new SiPMs wer
 e already tested with an ultra-fast blue laser (400 nm\, 100 ps) and the n
 ew electronics front-end (FEE) that showed a dynamic range from 0 to 2 V\,
  a rise time of ∼ 2 ns with full signal in ~ 70 ns and a time resolution
  less than 50 ps even at a charge as low as 100 pC (∼ 250 Np.e.). The pr
 oto-1 operational temperature will be 0/−10◦C and the performance will
  be validated in a dedicated test beam. Specifically\, our goals are: 1) p
 erform a complete operational test of the prototype\, including operation 
 with cooling\; 2) obtain data for a complete analysis of digitized signals
  from the detector for electrons and minimum-ionizing particles\; 3) test 
 the cluster reconstruction capability and measure the time resolution\; 4)
  measure longitudinal and transverse shower profile and compare with resul
 ts obtained in simulation. \nDetails about the prototype mechanics and ele
 ctronics will be shown\; Proto-1 will be tested in a dedicated test beam a
 t Cern before the end of 2023.\n\nhttps://indico.tlabs.ac.za/event/112/con
 tributions/2769/
LOCATION: Meeting Room 2.41 - 2.43
URL:https://indico.tlabs.ac.za/event/112/contributions/2769/
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