MaPMT L0 Electronics & Photo detector mounts
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MaPMT Workshop, Imperial College, 26/27 June 2003 F. Muheim 1 MaPMT L0 Electronics & MaPMT L0 Electronics & Photo detector mounts Photo detector mounts Report from meeting – at CERN 22 May 2003 and follow-ups L0 motherboard – Design completion scheduled for end 2003 – on critical path for MaPMTs Photo detector mounts – RICH 2 end of 2003 solution required which satisfies boundary conditions – RICH 1 more severe space constraints Conceptual Design
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MaPMT L0 Electronics & Photo detector mounts. Report from meeting at CERN 22 May 2003 and follow-ups L0 motherboard Design completion scheduled for end 2003 on critical path for MaPMTs Photo detector mounts - PowerPoint PPT Presentation
Transcript of MaPMT L0 Electronics & Photo detector mounts
MaPMT Workshop, Imperial College, 26/27 June 2003
F. Muheim 1
MaPMT L0 Electronics &MaPMT L0 Electronics &Photo detector mountsPhoto detector mounts
Report from meeting – at CERN 22 May 2003 and follow-ups
L0 motherboard – Design completion scheduled for
end 2003
– on critical path for MaPMTs Photo detector mounts
– RICH 2 end of 2003 solution required which satisfies boundary conditions
– RICH 1 more severe space constraints
Conceptual Design
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3 x 3 MaPMT Cluster Set-up3 x 3 MaPMT Cluster Set-up
40 MHz Read-out40 MHz Read-outAPVm chipAPVm chip
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BleederboardsBleederboards
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MaPMT ModuleMaPMT Module Modules of 4x4 MaPMTs
– 16 tubes, 1024 channels
– Size: 113.8 x 113.8 mm2
– Filling factor: 0.72
– Frame: carbon fibre, G10
– Cooling: 16 W / module -metal shield
– for individual tubes 0.9 mm thick Lenses
– incorporated in module
– no optical contact RICH system
– # of modules: 232
– 3504 MaPMTs
– # of channels: 237 kc
Proposal for photodetector choice / TDR
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LHCb RICH2 MaPMTsLHCb RICH2 MaPMTs
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CoolingCooling Power Dissipation
– Bleeder board 0.55 W / resistor chain at HV = 1000 V– Power dissipation 8.8 W / module (MaPMTs)
2.2 W / module if 4 tubes share resistor chain
– Beetle chip 750 to 900 mW or 6-7 mW / channel – Power consumption 7.2 W / module (8 Beetle chips)– Total power dissipation 16 W / module
~ 1000 W/ half plane– compare EUSO 200 W / plane
need to understand this difference– Cockroft-Walton
Cooling design– needs input from L0 motherboard design
Connections, Beetle pad layout
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RICH2 Photo Detector Plane RICH2 Photo Detector Plane Proposal by Olav Assumptions
– basic unit for electronics 1024 channels, 8 Beetles, 16 tubes
– From cooling simulations heat sink not more than 2 tubes wide
Modules of 8 x 2 MaPMTs– MaPMT pitch 28 mm
– module width 56 mm
– module height 224 mm
RICH 2 implementation– # of modules 72 / half plane
– # of MaPMTs 1152 / half plane
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Photo Detector FootprintPhoto Detector Footprint Assumptions
– MaPMT pitch 28.45 mm (Olav used 28 mm) RICH 2 half plane
– photo detector area 1300 mm x 682 mm (RICH2 EDR)– 6 columns with 11 modules of 4x4 tubes, total 1056 MaPMTs
12 columns with 6 modules of 2x8 tubes, total 1152 MaPMTs RICH 1 half plane
– photo detector area 1200 mm x 540 mm (email Dave Websdale)
– 11 rows with 5 modules of 4x4 tubes, total 880 MaPMTs 6 rows with 10 modules of 2x8 tubes, total 960 MaPMTs
Total RICH 1 and RICH 2– # of MaPMTs with 4x4 modules 3872– # of MaPMTs with 8x2 modules 4224 – less flexibility with 8x2 modules up to 9%
more MaPMTs and electronics needed
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Magnetic Shield/LensesMagnetic Shield/Lenses
-metal shield– for individual tubes
– thickness: 0.9 mmincreased B field in
RICH 1
– not necessary in RICH 2
Lenses– could be incorporated in
magnetic shielding
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Magnetic ShieldsMagnetic Shields Magnetic Field Measurements
– documented in note LHCb 2003-042
– requirement 10% maximum loss of photons
– MaPMT needs shielding above 20 G longitudinal field
– with -metal shielding can operate up to 80 G
RICH 2– maximum B-field in box 4.1 … 9.1 G (RICH2
EDR)
– about 5% loss of photo electrons at 10 G
– safety factor >2 for <10% loss requirement -metal shielding not required for RICH 2
RICH 1– see talk by Bill Cameron
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Longitudinal B-FieldLongitudinal B-Field
-metal shielding:0.9 mm thick13 or 20 mm extension
13
0.9
MAPMT
shielded MaPMT with 13 mm extension:
MaPMT functions in longitudinal fields up to 8 mT (80 G)
90%
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Lenses & Lenses & -metal Design-metal Design Different mounting designs possible Lenses / -metal mounted onto modules (Geoff Barber et
al)– lenses glued to MaPMT or spring loaded easy to exchange, little clearance needed costs if lenses are not glued to MaPMT lenses glued to MaPMT, transparency of glue
Lenses / -metal separate structure from modules– lenses or lens-arrays glued together can be used as gas seal, cost savings, no more quartz window cost savings, structure is glued larger clearance wrt to MaPMTs, seal must be gas tight cannot replace lens if it breaks or turns yellow
Lenses are separate structure from -metal -metal can be part of modules can combine advantages of above 2 designs– cost, complexity likely increases
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Transparent GlueTransparent Glue
EPO-TEK 301-2– 2 component epoxy
– refractive index 1.564
– increased B field in RICH 1
– not necessary in RICH 2 Transmission
– > 97% from 300 nm .. 2.5 m
Needs study– Is EUSO using it?
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IssuesIssues Footprints of RICH2 and RICH2
– agree on dimensions for basic components urgent– 4x4 vs 8x2 decision when?
Magnetic Shields– RICH 2 no -metal shields ok
– RICH 1 Is -metal shield really needed when?
– Lenses– study moulded lenses– agree on dimensions could be different for RICH 1 and RICH 2
when?– Decide if lenses make gas seal soon
Photo detector mounts– decide on design of lenses / -metal
when? Next steps
– Produce plan with decision points
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Backup SlidesBackup Slides
MaPMTMaPMTL0 motherboardL0 motherboard
MaPMTMaPMTL0 motherboardL0 motherboard
MaPMT meeting CERN 22 May 2004
Franz MuheimUniversity of Edinburgh
on behalf of MaPMT group
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L0 Interface Board L0 Interface Board 11stst prototype prototype
DACs
PINT
Power
supply
regulators
GOLs VCSEL
connectors to PIXEL chipTTCrx on reverse of board…
JTAG
connector
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Reverse of L0 Interface Board Reverse of L0 Interface Board 11stst prototype prototype
TTCrx
TTC receiver chip
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Transverse B-FieldTransverse B-Field
Transverse field in x-direction
MaPMT insensitive to transverse fields up to 23mT (230 G) without shielding
normalised light yield in whole MaPMT
90%
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Longitudinal B-FieldLongitudinal B-FieldColour
Legend
1 mT
2 mT
3 mT
4 mT
5 mT
6 mT
7 mT
8 mT
9 mT
10 mT
15 mT
20 mT
25 mT
30 mT
35 mT
Conclusions:
Agreement with previous test
Top and bottom row drop first
Sizable loss for edge rows at 3mT
Decrease due to loss of p.e.
Row 5 anomaly understood from x-talk in APVm readout
No shielding
light yield: rows light yield: columns
CoG: rows CoG: columns
R1
R5
R6
C1 C6
6mT
