1 / 29

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

jabir
Download Presentation

M. Bonesini INFN Milano

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript


  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

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

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

  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

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

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

  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

More Related