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- Yield, e/MeV with production crystals and production VPTs

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

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- Yield, e/MeV with production crystals and production VPTs

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  1. 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 WACH4, 28 Nov 2002

  2. E0’ E0’ Up to 4 Standard SCs Dee services and electronic integration issues Umbilical noise, optimal cable layout studies WACH4, 28 Nov 2002

  3. E0’ Umbilical Fibres SC01 being prepared for E0’ Mounting SC01 to E0’ WACH4, 28 Nov 2002

  4. E0’ stages of build 8 cm moderator F.O bundle LV HV Umbilical Backplate cooling NOTE OFFSET SLOTS in X Interim cooling plane Power cooling plane WACH4, 28 Nov 2002

  5. 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

  6. E0’ http://hepwww.rl.ac.uk/CMSecal/E0prime.htm 780.17 Thermal screen 800.00 904.00 WACH4, 28 Nov 2002

  7. E0’ – current positional spacers Spacer numbering Column, Row 5,5 6,5 5,4 6,4 WACH4, 28 Nov 2002

  8. 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

  9. 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 WACH4, 28 Nov 2002

  10. E0’ crystals . Enough for 3 of 4 SCs WACH4, 28 Nov 2002

  11. EE crystal inventory R&D EE crystals, year 2000, ACCOS, no FNUF corrections SC02 WACH4, 28 Nov 2002

  12. EE crystal inventory Pre-production crystals, 2001, ACCOS, no FNUF corrections WACH4, 28 Nov 2002

  13. 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

  14. E0’ • Proposal: • Approve sending pre-production crystals to UK, FNUF<0.57 • Approve 25-30 crystals for E0’ from order for 100 production crystals due to be launched shortly • Shipment of E0’ from RAL to 867 or Meyrin in Feb 2003 • Fitting E0’ with ‘most useful/available’ light to light electronics, March – May, 2003 WACH4, 28 Nov 2002

  15. Appendix WACH4, 28 Nov 2002

  16. 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 WACH4, 28 Nov 2002

  17. SC01 FNUF values 27 La crystals, 1998 SC01 WACH4, 28 Nov 2002

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