M. Bonesini - MICE CM CERN 24/2/071 M. Bonesini INFN Milano Updates on TOF project.

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

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M. Bonesini INFN MilanoUpdates on TOF project


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Outline

Hot topics BTF testbeam analysis completed TOF1/2 PMTs shieldings issue

TOF0/1 schedule TOF2 schedule


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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


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Estimation of Npe

Npe ~ 200-300 p.e. depending on impact point, in agreement with GUIDEIT lightguide simulation


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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)


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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


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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)


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B field with one 100 mm iron shield (current design)


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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


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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


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R. Bertoni, M. Bonesini

INFN MIB


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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


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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


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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


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B_r

B_z

G. Gregoire scheme givesvery effective shielding for TOF1/2

500 gauss

-- 500 gauss


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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


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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


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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


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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


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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” …)


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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)


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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


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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 …


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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 24/2/071 M. Bonesini INFN Milano Updates on TOF project.

Documents

bonesini mice

estimation of n pe n

tof project slide

bonesini infn milano

conventional pmts

tof0 pmts

small b field b

correction use