E0’ test beam targets in 2003
- 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
CMS ECAL End Cap
WACH4, 28 Nov 2002
D Cockerill - RAL (1)
E0’
E0’
Up to 4 Standard
SCs
Dee services and
electronic
integration
issues
Umbilical noise,
optimal cable
layout studies
CMS ECAL End Cap
WACH4, 28 Nov 2002
D Cockerill - RAL (2)
E0’
Fibres
Umbilical
SC01 being prepared for E0’
CMS ECAL End Cap
Mounting SC01 to E0’
WACH4, 28 Nov 2002
D Cockerill - RAL (3)
E0’ stages of build
8 cm moderator
F.O bundle
LV
HV
Umbilical
Backplate cooling
NOTE OFFSET SLOTS in X
CMS ECAL End Cap
Interim cooling plane
Power cooling plane
WACH4, 28 Nov 2002
D Cockerill - RAL (4)
E0’ complete
Accurate cross section
through Dee
All service planes
incorporated
50 channel analogue
readout box currently
incorporated
SC01
SC02
Noise studies to end
2002
CMS ECAL End Cap
WACH4, 28 Nov 2002
D Cockerill - RAL (5)
E0’ http://hepwww.rl.ac.uk/CMSecal/E0prime.htm
780.17
Thermal
screen
800.00
904.00
CMS ECAL End Cap
WACH4, 28 Nov 2002
D Cockerill - RAL (6)
E0’ – current positional spacers
Spacer numbering
Column, Row
CMS ECAL End Cap
5,5
6,5
5,4
6,4
WACH4, 28 Nov 2002
D Cockerill - RAL (7)
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
CMS ECAL End Cap
WACH4, 28 Nov 2002
D Cockerill - RAL (8)
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 crystals
Measure 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
CMS ECAL End Cap
WACH4, 28 Nov 2002
D Cockerill - RAL (9)
E0’ crystals
Current EE Crystal Stock, FNUF < 0.57
100 R&D Year 2000
Total
.
32
(5 in SC02)
Total available:
100 Pre-production,
2001
Known whereabouts
22 RAL
4 CERN
26 => 1 SC
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
CMS ECAL End Cap
WACH4, 28 Nov 2002
D Cockerill - RAL (10)
EE crystal inventory
R&D EE crystals, year 2000, ACCOS, no FNUF corrections
SC02
CMS ECAL End Cap
WACH4, 28 Nov 2002
D Cockerill - RAL (11)
EE crystal inventory
Pre-production crystals, 2001, ACCOS, no FNUF corrections
CMS ECAL End Cap
WACH4, 28 Nov 2002
D Cockerill - RAL (12)
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 ?
CMS ECAL End Cap
WACH4, 28 Nov 2002
D Cockerill - RAL (13)
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
CMS ECAL End Cap
WACH4, 28 Nov 2002
D Cockerill - RAL (14)
Appendix
CMS ECAL End Cap
WACH4, 28 Nov 2002
D Cockerill - RAL (15)
FNUFs
SC01 (La), SC02
FNUF >1.0
SC01
1998 La xtals
0.5<FNUF<1.0
FNUF<0.5
SC02
from 100 R&D xtals
in 2000
SC01 and SC02 intended for noise studies, not test beam
CMS ECAL End Cap
WACH4, 28 Nov 2002
D Cockerill - RAL (16)
SC01 FNUF values
27 La crystals, 1998
SC01
CMS ECAL End Cap
WACH4, 28 Nov 2002
D Cockerill - RAL (17)