M. Bonesini - MICE CM18 RAL 16/06/071 M. Bonesini INFN Milano Updates on TOF project

M. Bonesini - MICE CM18 RAL 16/06/072 Outline Hot topics TOF0/1 counter construction Installation issues TOF1/2 PMT shielding TOF software/simulation TOF readout Conclusions

M. Bonesini - MICE CM18 RAL 16/06/073 Hot issue: detector construction Material procurement: PMTs delivered Scintillator delivered Electronics in delivery Counter assembly: mount & calibrate detectors with cosmics. Here we have delays (1-1.5 months) Production of lightguides (70% done) + glueing in external firm (ALPEAT To) not yet finished Final counter prototyping is fine (PMTs holders, light tightness, wrapping). Still lacking to finalize laser light injection system into counters: tests in progress to use a laser diode instead of a more expensive Nd-Yag laser Detector plane assembly: X/Y planes in a rigid structure. Define “interface” with supports

M. Bonesini - MICE CM18 RAL 16/06/074 TOF installation issues Tof station detector structure

M. Bonesini - MICE CM18 RAL 16/06/075 TOF0 support (with CKOV) Thanks to Ghislain and Wing

M. Bonesini - MICE CM18 RAL 16/06/ Space take up for the combined Cherenkov & TOF0 Thanks to Wing

M. Bonesini - MICE CM18 RAL 16/06/077 Hall space available to the Ckov & TOF 0 Beam line 3 Main concern: access to detectors … 25 cm width is a problem Thanks to Wing

M. Bonesini - MICE CM18 RAL 16/06/078 Problems: cabling (HV, signal, calibration fibers …) checks with 3-D calculations: TOF PMTs with mu- metal shielding can bare only B // up to ~ 60 G TOF1 cage

M. Bonesini - MICE CM18 RAL 16/06/079 A small very useful request from EMCAL and TOF2 Here we require a cable by-pass under the new MICE Hall floor for EMCAL+TOF2 and a basement level hole in the wall for cables

M. Bonesini - MICE CM18 RAL 16/06/0710 PMTs tests: conventional PMTs shielding  TOF0 PMTs requires no shielding, aside 1 mm  -metal due to small B field (B << 50 Gauss, Kevin private communication)  TOF1/2 even after the 100 mm global iron shielding needs some additional shielding to use conventional PMTs (as B // ~ G, B _|_ ~ 1000 G)

M. Bonesini - MICE CM18 RAL 16/06/0711 Problem: R4998 can bare B perp but not B // B // < 50 Gauss fine; B _|_ < Gauss fine eventually additional  -metal or soft iron

M. Bonesini - MICE CM18 RAL 16/06/0712 B field with one 100 mm iron shield (current design)

M. Bonesini - MICE CM18 RAL 16/06/0713 B field is ~ G //; ~ 1000 G _|_ at r=30-35 cm (PMTs position) I doubt it can be shielded with individual PMTs shields, preserving good timing properties this point to 2 nd shield, but we will try to test PMTs “exotic shieldings” by building a 400 G lab solenoid My old transparency at RAL CM16 BUILT: coil with 5 windings for fields up to G

M. Bonesini - MICE CM18 RAL 16/06/0714 Advocated solutions: Solution A (“Ghislain cage”): extra shield (50 mm) connected with joints to first shield (100 mm) and local shielding of PMTs (  -metal only if 420 mm hole) Solution B: no-extra shield but heavy local shielding of PMTs a la D0 (test magnet delivered now at Bicocca)

M. Bonesini - MICE CM18 RAL 16/06/0715 D0 tests (note # 2706) Problems: It will work for R4998 1” PMTs? Tests to be done for Gain + timing See some results later

M. Bonesini - MICE CM18 RAL 16/06/0716 R. Bertoni, M. Bonesini INFN MIB

M. Bonesini - MICE CM18 RAL 16/06/0717 Laser source (Nichia Blue laser diode + up to 1MHz Avtec fast pulser: signals 100 ps- 2 ns) field up to 470 G (now: 40A power), to go up to G with new power supply (on loan) signal comparable to BTF (~ mV) Use of different shieldings: mu-metal only, additional Fe shielding, …

M. Bonesini - MICE CM18 RAL 16/06/0718 R4998 PMTs: Fe box shielding

M. Bonesini - MICE CM18 RAL 16/06/0719 PMT tests results: B //

M. Bonesini - MICE CM18 RAL 16/06/ cm Extending the Fe box beyond the mu-metal shielding makes it much more effective

M. Bonesini - MICE CM18 RAL 16/06/0721 From presentation by G. Gregoire at PC-224 and J.Cobb at PID // session  Close outer gap between to discs; thicker 2nd disc (50mm) Somewhat more complex – engineering / mounting TOFs…. G. Gregoire Shield

M. Bonesini - MICE CM18 RAL 16/06/0722

M. Bonesini - MICE CM18 RAL 16/06/0723 B_r B_z G. Gregoire scheme gives very effective shielding for TOF1/2 500 gauss gauss

M. Bonesini - MICE CM18 RAL 16/06/0724

M. Bonesini - MICE CM18 RAL 16/06/0725 A full 3-D calculation (TOSCA) in progess. Useful to check “small” effects, such as working holes … Remind max B // ~ 60 G with mu-metal only

M. Bonesini - MICE CM18 RAL 16/06/0726 Laser calibration + electronics CAEN FADC (V1724) not yet delivered, but work going on on firmware Pavia group may probably take care of the NINO chip “affair” (this solution is preliminary to any serious thinking about SW: to free the CAEN V1724 FADC used now by TOF) some work on laser light injection in progress with MEG (to allow use of a cheaper laser diode, such as Hamamatsu PLP10): this requires to maximize laser injection efficiency Tests to be done soon with alumized bi-prisms

M. Bonesini - MICE CM18 RAL 16/06/0727 TOF simulation studies from Yordan Simulation and Digitization of the TOF sector are completed Reconstruction for the simulated data is completed TofHit, TodDigit, TofSlabHit and TofSpacePoint objects with the relevant pointer links between them are present in the output of the reconstruction The new code is committed in the packages Persist, DetResp, DetModel, Interface and Recon. We are open for ideas for improvement, for example implementation of dependence of time resolution on the position of the hit in the bar, or anything else. From Y. Kharazdov presentation at PID meeting

M. Bonesini - MICE CM18 RAL 16/06/0728 TOF simulation Positions of the hits in the TOF stations taken from the Simulation TURTLE beam is used Configuration for stage events are simulated

M. Bonesini - MICE CM18 RAL 16/06/0729 Comparison of the times from Simulation and Reconstruction This time difference is obtained by using 100 ps intrinsic time resolution for each PMT. This means that we expect 100/sqrt(2) ~ 70 ps intrinsic time resolution for each bar and 70/sqrt(2) ~ 50 ps intrinsic time resolution for each station. This fits very well with what we see in the plots.

M. Bonesini - MICE CM18 RAL 16/06/0730 Conclusions TOF0/1 counter construction is progressing; readout scheme worked out; software issues tackled some installation issues to be spotted out laser calibration system to be finalized still some delays arising from INFN situation not fully worked out (NTA approval, funding [up to now we are at 0 E] …)