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Muon triggering system for the ALICE TOF cosmic tests

CBM – Russia meeting at ITEP, Nov 5 th 2004. Muon triggering system for the ALICE TOF cosmic tests. for the ITEP Moscow: A.Akindinov Yu.Grishuk S.Kiselev D.Mal’kevich M.Ryabinin A.Smirnitski K.Voloshin B.Zagreev. - NIM, A387, pp. 231-234, 1997

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Muon triggering system for the ALICE TOF cosmic tests

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  1. CBM – Russia meeting at ITEP, Nov 5th 2004 Muon triggering system for the ALICE TOF cosmic tests for the ITEP Moscow: A.Akindinov Yu.Grishuk S.Kiselev D.Mal’kevich M.Ryabinin A.Smirnitski K.Voloshin B.Zagreev • - NIM, A387, pp. 231-234, 1997 • - Patent for invention of Russia, №2142175, 1999 • - Preprint ITEP 11 - 03, 2003 • - 8th ICATPP, Villa Elba, Como, 6-10 Oct., 2003 • Preprint ITEP 05 - 04, 2004 • PTE, appr. for publishing, May, 2004 • NIM, submitted in Sept., 2004

  2. ALICE TOFCosmic Ray Test Facility • The mechanical farm is already built • Trigger counters are under construction To separate straight tracks of high-energy muons one needs at least 3 planes of trigger detectors organized in a granular structure TOF modules may be installed in 6 different positions

  3. ALICE TOFCosmic Tests of Detector ElementsMuon Triggering System ITEP ‘Tile’ WLS fiber (Kuraray Y11) and MRS APD (by CPTA, Moscow) with 11 mm2 working area • scintillator plate • dimensions 15151 cm3 • two round grooves at both surfaces • two WLS fibers will be put into the grooves to collect light and to concentrate it on two MRS APDs

  4. ALICE TOFCosmic Tests of Detector ElementsTrigger Detector ITEP scintillator plate WLS fibers inside round grooves APDs Completely functional trigger detectorfor the ALICE TOF Cosmic Ray Facility.FEE card implemented. Assembling of a trigger detector

  5. ALICE TOFCosmic Tests of Detector ElementsTrigger Detector under Test ITEP Amplitude spectra Beam to different places of the ‘tile’

  6. ALICE TOFCosmic Tests of Detector ElementsConstruction of the Muon Triggering System Phase 1: building the prototype of a mosaic trigger detectorThe work has been launched at ITEP Assembly procedure Processing the scintillator plates

  7. ALICE TOFCosmic Tests of Detector ElementsMuon Triggering System Light detection by high-gain MRS APD 2 MRS APDs per cell Mosaic stricture of the trigger detector Various kinds of MRS APDsused in prototypes • dense packing ensures the absence of ‘dead’ zones • intrinsic noise of a single cell ~ 0.01 Hz • sensitive area size ~ 1 mm2 • gain ~ 106

  8. Parameters: FE card and input signal Ampl. 0.5 V/pC ( at 35 pF ) Noise ~ 3000 e- Res. time of coincidence circuit 10 – 40 ns Working point 51 V Thresh. 130 mV (260 fC) ~ 3.5 ph.e.

  9. 1 m2 muon detector – beam test with MIP

  10. Close plans for the ALICE TOF muon trigger system 1. 1 m**2 - ready ( May 2004 ) 2. 7 m**2 - plans : ready mid 2005 work currently performing at ITEP: - sc. plastic has been built by “Polimersintez” now under machining at ITEP - FEE cards constr. close to finish (next week) - MRS APDs – still under choosing latest version i.e. so far: OK - assembly/tests – winter/spring 2005 3. 20 m**2- full system - plans: ready mid 2006

  11. Resume on experience with 1 m**2 array of STARTs • Stable, repeatable characteristics • Response to MIP – clear, stays far above the pedestal – • - 100% efficiency • 3. Due to geometry – can be easily arranged in large trigger array 4. Cost – 70–140 USD/cell - now For large system ( ~ 40 cells/m**2) – 2–3 kUSD/m**2 - now Clear prediction for cost reduction… Will be used for cosmic muon triggering in ALICE TOF - now Good candidate to replace RPC for high rate muon triggering Intrinsic noise – around 10** -2 Hz/cell - now could be easily reduced to 10**-3 – 10**-4 Hz/cell - now

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