E 0 test beam targets in 2003 —

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E 0’ test beam targets in 2003 - Yield, e/Me. V 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 50 cm 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 WACH 4, 28 Nov 2002 1

E 0’ Up to 4 Standard SCs Dee services and electronic integration issues Umbilical noise, optimal cable layout studies CMS ECAL End Cap WACH 4, 28 Nov 2002 2

E 0’ Fibres Umbilical SC 01 being prepared for E 0’ CMS ECAL End Cap Mounting SC 01 to E 0’ WACH 4, 28 Nov 2002 3

E 0’ 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 WACH 4, 28 Nov 2002 4

E 0’ complete Accurate cross section through Dee All service planes incorporated 50 channel analogue readout box currently incorporated SC 01 SC 02 Noise studies to end 2002 CMS ECAL End Cap WACH 4, 28 Nov 2002 5

E 0’ http: //hepwww. rl. ac. uk/CMSecal/E 0 prime. htm 780. 17 Thermal screen 800. 00 904. 00 CMS ECAL End Cap WACH 4, 28 Nov 2002 6

E 0’ – current positional spacers Spacer numbering Column, Row 5, 5 5, 4 CMS ECAL End Cap 6, 5 6, 4 WACH 4, 28 Nov 2002 7

E 0’ – current positional spacers IP, beam Establish angles to beam needed for positioning plate on H 4 turntable Angle (y-z plane) o At top of array 11. 5 At centre of array ~ tan-1(60 cm/320 cm) 10. 6 o At bottom of array 9. 7 o CMS ECAL End Cap WACH 4, 28 Nov 2002 8

E 0’ Supercrystals SC 01 and SC 02 not suited for test beam: high FNUFs, La doping (SC 01), 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 WACH 4, 28 Nov 2002 9

E 0’ crystals Current EE Crystal Stock, FNUF < 0. 57 100 R&D Year 2000 Total. 32 (5 in SC 02) Total available: 100 Pre-production, 2001 Known whereabouts 22 RAL 4 CERN 26 => 1 SC 74 (77 including bad RNUF/grad. TT) (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 WACH 4, 28 Nov 2002 10

EE crystal inventory R&D EE crystals, year 2000, ACCOS, no FNUF corrections SC 02 CMS ECAL End Cap WACH 4, 28 Nov 2002 11

EE crystal inventory Pre-production crystals, 2001, ACCOS, no FNUF corrections CMS ECAL End Cap WACH 4, 28 Nov 2002 12

E 0’ 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 E 0’? • Status for charge injection ? • Electron calibration in lab ? CMS ECAL End Cap WACH 4, 28 Nov 2002 13

E 0’ Proposal: 1) Approve sending pre-production crystals to UK, FNUF<0. 57 2) Approve 25 -30 crystals for E 0’ from order for 100 production crystals due to be launched shortly 3) Shipment of E 0’ from RAL to 867 or Meyrin in Feb 2003 4) Fitting E 0’ with ‘most useful/available’ light to light electronics, March – May, 2003 CMS ECAL End Cap WACH 4, 28 Nov 2002 14

Appendix CMS ECAL End Cap WACH 4, 28 Nov 2002 15

FNUFs SC 01 (La), SC 02 FNUF >1. 0 SC 01 1998 La xtals 0. 5<FNUF<1. 0 FNUF<0. 5 SC 02 from 100 R&D xtals in 2000 SC 01 and SC 02 intended for noise studies, not test beam CMS ECAL End Cap WACH 4, 28 Nov 2002 16

SC 01 FNUF values 27 La crystals, 1998 SC 01 CMS ECAL End Cap WACH 4, 28 Nov 2002 17

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