WACH4, 28 Nov 2002 D Cockerill - RAL (1)CMS ECAL End Cap
- Yield, e/MeV with production crystals and production VPTs
- Pre-calibration precision using VPT and crystal lab data
- Detailed scan across 4 SCs: SC across to SC, across 4 SC meeting point
- Comparison to Monte Carlo, constant term versus FNUF: lead shading of chamfers
- Quantify level of white/coherent noise for 50cm read out lines
- Laser monitoring - laser light in rear of xtal, signal with VPT instead of APD
- Measure R for endcap crystals/endcap monitoring, especially ‘soft’ 2001 crystals
- Data analysis
- Complementary work to that of existing teams looking at barrel data
E0’ test beam targets in 2003
WACH4, 28 Nov 2002 D Cockerill - RAL (2)CMS ECAL End Cap
E0’
E0’
Up to 4 Standard SCs
Dee services and electronic integration issues
Umbilical noise, optimal cable layout studies
WACH4, 28 Nov 2002 D Cockerill - RAL (3)CMS ECAL End Cap
E0’
SC01 being prepared for E0’
Mounting SC01 to E0’
Fibres
Umbilical
WACH4, 28 Nov 2002 D Cockerill - RAL (4)CMS ECAL End Cap
E0’ stages of build
Backplate cooling
NOTE OFFSET SLOTS in X
Interim cooling plane Power cooling plane
HV
8 cm moderator
LV
F.O bundle
Umbilical
WACH4, 28 Nov 2002 D Cockerill - RAL (5)CMS ECAL End Cap
E0’ complete
Accurate cross section through Dee
All service planes incorporated
50 channel analogue readout box currently incorporated
Noise studies to end 2002
SC01
SC02
WACH4, 28 Nov 2002 D Cockerill - RAL (6)CMS ECAL End Cap
E0’ http://hepwww.rl.ac.uk/CMSecal/E0prime.htm
904.00
800.00
780.17
Thermalscreen
WACH4, 28 Nov 2002 D Cockerill - RAL (7)CMS ECAL End Cap
E0’ – current positional spacers
6,45,4
5,5 6,5
Spacer numbering
Column, Row
WACH4, 28 Nov 2002 D Cockerill - RAL (8)CMS ECAL End Cap
E0’ – current positional spacers
IP, beam
Establish angles to beam needed for positioning plate on H4 turntable
Angle (y-z plane)
At top of array 11.5o
At centre of array ~ tan-1(60cm/320cm) 10.6o
At bottom of array 9.7o
WACH4, 28 Nov 2002 D Cockerill - RAL (9)CMS ECAL End Cap
E0’ Supercrystals
SC01 and SC02 not suited for test beam: high FNUFs, La doping (SC01), etc.
Require 4 new SCs, 100 crystals
Propose to use existing EE crystals with ACCOS FNUF ~<0.55%
• correction factor, ACCOS to Alveolar ~ -0.05 - -0.1 • correction factor, lead shading of chamfers, ~ -0.1• should achieve all FNUFs ~<0.35-0.4
IC (D Britton) prepared to shade chamfer of higher FNUF crystalsMeasure FNUF before/after operation.
Try to make SCs from same batch, all year 2000, or all year 2001 (rad soft)
Will need crystals from next order of 100 EE crystals
WACH4, 28 Nov 2002 D Cockerill - RAL (10)CMS ECAL End Cap
E0’ crystals
.
Current EE Crystal Stock, FNUF < 0.57
Total Known whereabouts
100 R&D Year 2000 32(5 in SC02)
22 RAL 4 CERN
Total available: 26 => 1 SC
100 Pre-production, 2001
74(77 including
bad RNUF/gradTT)
(18 Ren Yuan)
15 Roma
3 ETH
13 UK
20 CERN, Bldg 27
Total available: 51 => 2 SCs
Enough for 3 of 4 SCs
WACH4, 28 Nov 2002 D Cockerill - RAL (11)CMS ECAL End Cap
EE crystal inventory
SC02
R&D EE crystals, year 2000, ACCOS, no FNUF corrections
WACH4, 28 Nov 2002 D Cockerill - RAL (12)CMS ECAL End Cap
EE crystal inventory
Pre-production crystals, 2001, ACCOS, no FNUF corrections
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E0’ lab setting up/readout issues
•Location: 867 or Meyrin site ?
•Light – to –light : how many ULR crates/stations ?
•Lasers : more than one or share with EB activities?
•MEM boxes : share ?
•Use single VPT test box/Stephenson preamp => camac to monitor laser into E0’?
•Status for charge injection ?
•Electron calibration in lab ?
WACH4, 28 Nov 2002 D Cockerill - RAL (14)CMS ECAL End Cap
E0’
Proposal:
1) Approve sending pre-production crystals to UK, FNUF<0.57
2) Approve 25-30 crystals for E0’ from order for 100 production crystals due to be launched shortly
3) Shipment of E0’ from RAL to 867 or Meyrin in Feb 2003
4) Fitting E0’ with ‘most useful/available’ light to light electronics, March – May, 2003
WACH4, 28 Nov 2002 D Cockerill - RAL (15)CMS ECAL End Cap
Appendix
WACH4, 28 Nov 2002 D Cockerill - RAL (16)CMS ECAL End Cap
FNUFs SC01 (La), SC02
FNUF >1.0
0.5<FNUF<1.0
FNUF<0.5
SC011998 La xtals
SC02 from 100 R&D xtals in 2000
SC01 and SC02 intended for noise studies, not test beam
WACH4, 28 Nov 2002 D Cockerill - RAL (17)CMS ECAL End Cap
SC01 FNUF values
27 La crystals, 1998
SC01
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