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M. Bonesini - MICE CM CERN 24/2/07
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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
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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
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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
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Conventional PMTs Conventional PMTs shieldingshielding
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// ~ 200-300 G, B _|_ ~ 1000 G)
M. Bonesini - MICE CM CERN 24/2/07
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Problem: R4998 can bare B_|_ but not B//
B//< 50 Gauss fine; B_|_ < 100-120 Gauss fine
eventually additional -metal or soft iron
M. Bonesini - MICE CM CERN 24/2/07
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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 CM CERN 24/2/07
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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” by building a 400 G lab solenoid
My old transparency at RAL CM16
BUILT: coil with 5 windings for fields up to 700-800 G
M. Bonesini - MICE CM CERN 24/2/07
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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
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• 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
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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 CM CERN 24/2/07
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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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B_r
B_z
G. Gregoire scheme givesvery effective shielding for TOF1/2
500 gauss
-- 500 gauss
M. Bonesini - MICE CM CERN 24/2/07
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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 -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
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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
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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 ofstretcher/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
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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
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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
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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
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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
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TOF2 updated costs 24/12/06
TOF2 missing costs to completion
earmarkedINFN investment
Conv PMTs (VAT) 66KE 66KE
Support mechanics+local PMT shielding
10KE 10KE
Scintillators+light guides+ counter laser injection
10KE 10KE
Cables 5KE 5KE
Patch panels … 3KE 3KE
Detector assembly (including external firms)
5KE 5KE
FE electronics(FADC+TDC+L.E. discr.+splitter+stretchers)
35KE Splitter+stretcher+ 1TDC + 1 FADC boards12KE
HV voltage (1/3) 16 KE No, recuperated
Total 150KE 111KE 39(16)KE
No contingency, minimal external costs …