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M. Bonesini INFN Milano

Updates on TOF project. M. Bonesini INFN Milano. Outline. Hot topics BTF testbeam analysis completed TOF1/2 PMTs shieldings issue TOF0/1 schedule TOF2 schedule. Completion of BTF data analysis. BTF data analysis is completed and a MICE note (MICE-DET-163) has been posted

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M. Bonesini INFN Milano

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  1. Updates on TOF project M. Bonesini INFN Milano M. Bonesini - MICE CM CERN 24/2/07

  2. Outline • Hot topics • BTF testbeam analysis completed • TOF1/2 PMTs shieldings issue • TOF0/1 schedule • TOF2 schedule M. Bonesini - MICE CM CERN 24/2/07

  3. Completion of BTF data analysis • BTF data analysis is completed and a MICE note (MICE-DET-163) has been posted • Results include: • intrinsic counter resolution (center bar hitting) • Intrinsic counter resolution (x scan) • study of time-walk (correction + use of a CF discriminators) • determination of Npe (200-300 pe) All results for Bicron BC404,BC408,BC420 and Amcrys-H UPS95F scintillators M. Bonesini - MICE CM CERN 24/2/07

  4. M. Bonesini - MICE CM CERN 24/2/07

  5. Estimation of Npe Npe ~ 200-300 p.e. depending on impact point, in agreement with GUIDEIT lightguide simulation M. Bonesini - MICE CM CERN 24/2/07

  6. Conventional PMTs shielding • TOF0 PMTs requires no shielding, aside 1 mm m-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// ~ 200-300 G, B _|_ ~ 1000 G) M. Bonesini - MICE CM CERN 24/2/07

  7. Problem: R4998 can bare B_|_ but not B// B//< 50 Gauss fine; B_|_ < 100-120 Gauss fine eventually additional m-metal or soft iron M. Bonesini - MICE CM CERN 24/2/07

  8. Advocated solutions: • Solution A (“Ghislain cage”): extra shield (50 mm) connected with joints to first shield (100 mm) and local shielding of PMTs (m-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 CM CERN 24/2/07

  9. B field with one 100 mm iron shield (current design) M. Bonesini - MICE CM CERN 24/2/07

  10. My old transparency at RAL CM16 • B field is ~ 200-300 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 2nd shield, but we will try to test PMTs “exotic shieldings” bybuilding a 400 G lab solenoid BUILT: coil with 5 windings for fields up to 700-800 G M. Bonesini - MICE CM CERN 24/2/07

  11. D0 tests (note # 2706) • Problems: • It will work for R4998 1” PMTs? • Tests to be done for Gain + timing See preliminary results later M. Bonesini - MICE CM CERN 24/2/07

  12. R. Bertoni, M. Bonesini INFN MIB M. Bonesini - MICE CM CERN 24/2/07

  13. Preliminary tests of Fe360 Box shielding (a la D0) seems promising • Needs more work: full tests with PMTs for Gain+timing • Use of different iron shields : Fe360, Armco, Inox … and shapes M. Bonesini - MICE CM CERN 24/2/07

  14. G. Gregoire Shield 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…. M. Bonesini - MICE CM CERN 24/2/07

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  17. Problems: • cabling (HV, signal, calibration fibers …) • in/out alignments (1cm = 50 ps): risk to loose calibration every time you move in/out M. Bonesini - MICE CM CERN 24/2/07

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  20. B_r -- 500 gauss B_z 500 gauss G. Gregoire scheme gives very effective shielding for TOF1/2 M. Bonesini - MICE CM CERN 24/2/07

  21. Solution A vs B • Solution A makes life easier for TOF1, but requires an extra shield + some problems for detector access + to change PMTs you move all detector (50 ps = 1 cm !!!). Clearly it is very attractive for TOF1 if hole has a 420 mm diameter (only m-metal for PMTs) • Solution B: must be tested (tests have now started at MIB), easier access to detector but more bulky support M. Bonesini - MICE CM CERN 24/2/07

  22. TOF0/1 project • spending to completion minimal, with many worked out savings • timescale dominated by funding problems (now maybe burocracy ) • I will divide project in 2 phases • Detector construction in-house • Detector installation/commissioning at RAL M. Bonesini - MICE CM CERN 24/2/07

  23. Detector construction in house • material procurement: up to now no big delays • All PMTs ordered • Scintillator/lightguides ordered (need to define LG shape for TOF1 mainly hole radius) • Electronics ordered ( status of stretcher/splitter ?) • Counter assembly: mount & calibrate detectors with cosmics here delay may arise • 3 months (April-June) to do this • Detector plane assembly: you need to assemble X/Y planes in a rigid structure • 1-2 months (July-August) to do this M. Bonesini - MICE CM CERN 24/2/07

  24. Front-End electronics • a baseline design has been proposed (stretcher/splitter+CAEN V1290 TDC+CAEN V1724 FADC+recuperated CAMAC LE discr) • all electronic boards ordered to CAEN • needs Sofia/UniGE for splitter/stretcher design&construction)+integration into DAQ M. Bonesini - MICE CM CERN 24/2/07

  25. Calibration system • only prisms+ fibers for injection into counters has been ordered • all the rest : cheap laser source, fiber bundle to be ordered/tested/assembled • as example, recent quotation from Quanta ~70K (needs clearly cheaper “non-commercial solution” …) M. Bonesini - MICE CM CERN 24/2/07

  26. RAL installation/commissioning • main hardware item: external supports for TOF stations, cage for TOF1 (RAL, UniGE ?) • detectors shipping to RAL • installation of TOF planes on external supports • cabling • electronic debugging • debugging with beam All this is less clear to me (as an INFN approval/prompt budgeting is needed) M. Bonesini - MICE CM CERN 24/2/07

  27. TOF2 project • TOF2 (albeit bigger … but how much? Need to fix dimensions in the PID group: 60 x 60 cm 2 ??) is a clone of TOF1 • schedule is more relaxed: it can be assembled beginning 2008 , but • material procurement must be in 2007 M. Bonesini - MICE CM CERN 24/2/07

  28. No contingency, minimal external costs … M. Bonesini - MICE CM CERN 24/2/07

  29. Conclusions • up to now no big delays for TOF0/1, but “friction” will increase with time • some extra help in April-June may be needed in Milano for tests/assembly • external supports, cage for TOF1 (if any) at RAL clearly uncovered M. Bonesini - MICE CM CERN 24/2/07

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