Fast Timing Workshop Krakow Nov 29 Dec 1

Fast Timing Workshop Krakow, Nov 29 - Dec 1 st 2010 Part 2 b

Mike Albrow 2

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Mike Albrow: Si. PMs 12

Mike Albrow: Si. PMs 13

Mike Albrow: Si. PMs Nice features of Si. PM: Having many measurements – timetrack – robust – self calibrating Resolution and offsets of each detector monitored by data. (In QUARTIC design, argument for multipad Photonis) Demands on electronics less: σ = 25 ns/ channel HPTDC can be used. Cheap: ~ $100 each (just detector) = $16 K for 160 devices. Can be quickly exchanged (“cartouche”, if mechanics designed) Can be extended with extra layers if z-slot large to improve measurement. Low voltage (~ 30 -60 V) gives gain ~ 106 and single p. e. resolution. ALICE uses for To. F, CMS may get 10, 000’s for HCAL. HPTDC adequate, but next version may get to ~ 10 ps 14

Mike Albrow: Si. PMs 15

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Mike Albrow: Si. PMs 20

Mike Albrow: Streak camera 21

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Krzysztof Piotrzkowski (Louvain) Gas. To. F Pico‐second Resolution Time‐of‐Flight Detector With L. Bonnet, J. Liao, T. Pierzchala, and N. Schul 23

Krzysztof Piotrzkowski 24

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Krzysztof Piotrzkowski 31

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Krzysztof Piotrzkowski 33

Jim Pinfold (Alberta) 34

Jim Pinfold (Alberta) GASTOF – a gas Cerenkov detector that makes a single measurement QUARTIC – two QUARTIC detectors each with 4 rows of 8 fused silica bar will be positioned after the last 3 D-Si tracking station because of the multiple scattering effects in the fused silica. Both detectors employ Micro Channel Plate PMTs (MCP-PMTs)s a single measurement QUARTIC – two QUARTIC detectors each with 4 rows of 8 fused silica bar will be positioned after the last 3 D-Si tracking station because of the multiple scattering effects in the fused silica. 35 Both detectors employ Micro Channel Plate PMTs (MCP-PMTs)

Jim Pinfold (Alberta) 36

Jim Pinfold (Alberta) 37

Jim Pinfold (Alberta) 38

Jim Pinfold (Alberta) Tested a prototype Burle Planacon tube using variable length fibers Examined both row and column effect of spillover signal 100, 250 and 500 ps before the target pulse About 10% of the pulse is detected in adjacent, empty pixels Data is not significantly affected later light Aboutshows 10% ofthat theearly pulselight is detected in adjacent, empty by pixels Later light mean time is shifted, but is not totally dominated by the early Data shows that early light is not significantly affected by later light pulse Late degrades Δt increases Latertime lightmeasurement mean time is shifted, butsignificantly is not totallyasdominated by the early Exploring ways to reduce this effect pulse Late time measurement degrades significantly as Δt increases Exploring ways to reduce this effect 39

Jim Pinfold (Alberta) Alberta: has upgraded Louvain CDF and developed HPTDC board Goals: Complete design of a 3 HPTDC chip, 8 channel HPTDC board based on successful one chip design (due to occupancy issues only 4 channels available/chip, and one of these is used for reference timing, so a 3 chip board gives 8+1 channels) Documentation + further system tests, including connections with ROD Radiation tests of CFD + HPTDC electronics Stony Brook – Goals: Tests of chain PULSER==>Preamp==>CFD SPICE model of the chain Pre. Amp==>CFD==>Trigger Tests of trigger circuitry Detailed design of Pre. Amp PCB Detailed design of Trigger circuitry 40

Jim Pinfold (Alberta) 41

Jim Pinfold (Alberta) 42

Jim Pinfold (Alberta) 43

Jim Pinfold (Alberta) HPTDC (CERN) - 12 ps resolution obtained with pulser - Successfully tested at UTA laser test 13. 7 ps resolution obtained with CFD stand with laser /10 m tube/ZX 60 amp/CFD - - ~30 ps resolution obtained with real pulses at test beam 44

Jim Pinfold (Alberta) 45

Jim Pinfold (Alberta) Are need We MCP-PMT’s to establish capable if theof. MCP-PMT’s coping with are the capable large expected of coping rates withatthe large expected LHC: up to 15 MHz ratesinata the 6 mm LHC: x 6 mm up topixel 15 MHz of thein. MCP-PMT a 6 mm x 6 mm ? pixel of the MCP-PMT Lifetime due to photocathode damage from positive ions is proportional to Lifetime due extracted charge: to photocathode damage from positive ions is proportional to extracted charge: Using the current limits mentioned previously we get to 35 C/ cm 2 /yr Using the current (assuming 5 x 104 gain) limits at mentioned the highest previously lumi we get to 35 C/ cm 2 /yr (assuming 5 x 104 gain) at the highest lumi This is a factor of ~50 more than the expected tube lifetime! We can get this down by a factor of 2 using a fibre detector but we still We can need a factor get this of down 25. by a factor of 2 using a fibre detector but we still need a factor of 25. 46

Jim Pinfold (Alberta) We need to establish if the MCP-PMT’s are capable of coping with the large expected rates at the LHC: up to 15 MHz in a 6 mm x 6 mm pixel of the MCP-PMT Lifetime due to photocathode damage from positive ions is proportional to extracted charge: Using the current limits mentioned previously we get to (assuming 5 x 104 gain) at the highest lumi 35 C/ cm 2 /yr This is a factor of ~50 more than the expected tube lifetime! We can get this down by a factor of 2 using a fibre detector but we still need a factor of 25. 47

Benno KROEK (Giessen) and Ann-Kathrin Rink Avetik Hayrapetyan Hasko Stenzel Klaus Föhl Kristof Kreutzfeldt Marko Zühlsdorf Michael Düren Michael Sporleder Oliver Merle Peter Koch Sabrina Darmawi Thomas Frach Gordian Prescher Carsten Degenhardt Ben Zwaans Fast Cherenkov counters for PANDA@FAIR and ATLAS-AFP@CERN 48

Benno KROEK (Giessen) 49

Benno KROEK (Giessen) 50

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Benno KROEK (Giessen) Outlook/Summary - Measurements: time and position of photons with MCPPMTs, Si. PMs and d. Si. PMs - Test results for Cherenkov DIRC (PANDA) and quartz fibers (AFP-ATLAS) - Next test with MCPPMT and d. Si. PM at DESY/Hamburg next week Work in progress 59