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

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E0’

E0’

Up to 4 Standard SCs

Dee services and electronic integration issues

Umbilical noise, optimal cable layout studies

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E0’

SC01 being prepared for E0’

Mounting SC01 to E0’

Fibres

Umbilical

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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

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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

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E0’ http://hepwww.rl.ac.uk/CMSecal/E0prime.htm

904.00

800.00

780.17

Thermalscreen

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E0’ – current positional spacers

6,45,4

5,5 6,5

Spacer numbering

Column, Row

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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

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EE crystal inventory

SC02

R&D EE crystals, year 2000, ACCOS, no FNUF corrections

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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

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Appendix

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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

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SC01 FNUF values

27 La crystals, 1998

SC01