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E. Auffray, CERN PH-CMA

Very preliminary results on new SIC crystals received 01/06/04. E. Auffray, CERN PH-CMA. Introduction. We received : 20 endcaps crystals 10 barrel crystals type 6 with 1 face depolished (lapped) They have all followed the “routine” QC procedure Identification Visual Inspection

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E. Auffray, CERN PH-CMA

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  1. Very preliminary results on new SIC crystals received 01/06/04 E. Auffray, CERN PH-CMA

  2. Introduction We received : • 20 endcaps crystals • 10 barrel crystals type 6 with 1 face depolished (lapped) • They have all followed the “routine” QCprocedure • Identification • Visual Inspection • Accoce2 measurements (exept 3D for 20 Endcaps crystals)

  3. 10 barrel crystals dimension

  4. Lateral Dimension AF AR BF BR CR CF

  5. length

  6. Planearity 1 2 6 5 3 4

  7. Right angle 1-3 1-6 2-3 2-6

  8. Right angle Barrel 2-3 2-6 Endcaps Jan 04 2-3 2-6

  9. Transmissions

  10. Longitudinal Transmission 10 barrel crystals 360nm 420nm 620nm

  11. Longitudinal Transmission 20 Endcap crystals 360nm 420nm 620nm

  12. Longitudinal TransmissionComparison with SIC data 360nm 420nm 620nm

  13. Transmission @ 360nm 10 barrels 05/04 20 Endcaps 05/04 50 Endcaps 01/04

  14. Transmission @ 420nm 10 barrels 05/04 20 Endcaps 05/04 50 Endcaps 01/04

  15. Transmission @ 620nm 10 barrels 05/04 20 Endcaps 05/04 50 Endcaps 01/04

  16. slope 10 barrels 05/04 20 Endcaps 05/04 50 Endcaps 01/04

  17. dispersion 10 barrels 05/04 20 Endcaps 05/04 50 Endcaps 01/04

  18. Gradient 10 barrels 05/04 20 Endcaps 05/04 50 Endcaps 01/04

  19. LY for barrel(1 face depolished) LY FNUF RNUF

  20. Correlation with SIC data

  21. Effect of the “depolishing”

  22. Conclusions on recent Chinese crystals • Dimension • Geometry has been improved for barrel • We have to see the results for Endcaps • Longitudinal transmission: • Good correlation with SIC data at 360nm • @ 420nm & 620nm the correlation is worse due probably to a different crystal orientation for measurements • Transmission for endcaps are similar to the previous batch • For the barrel, the transmission is lower (particularly @ 360nm)s • Dispersion of TTO : • For Endcaps it is the same than previous batch • For barrel the dispersion is better • Most of the crystals have been cut in the same direction • LY • Good correlation with SIC data (still 3pe/MeV difference) • LY Non uniformity • With 1 face lapped, FNUF of barrel crystals are slightly too negatif , • a Ra of ~0.45-0.5m should be enough to have uniform crystals

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