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RICH mirrors - what is available

RICH mirrors - what is available. Parameters of RICH-1 and RICH-2 mirrors Set-up for measurement of mirrors Measured mirrors - glass - Be - composite Results and conclusions. Parameters of RICH-1 and RICH-2 mirrors.

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RICH mirrors - what is available

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  1. RICH mirrors - what is available • Parameters of RICH-1 and RICH-2 mirrors • Set-up for measurement of mirrors • Measured mirrors - glass - Be - composite • Results and conclusions M. Laub, CERN EP/TA2

  2. Parameters of RICH-1 and RICH-2 mirrors RICH-1 : spherical mirrors, R = 1700 mm 16 segments, rectangular, 450 x 375 mm2 precision  = 0.3 mrad  5 % of X0 RICH-2 : 1) spherical mirrors, R = 8000 mm 56 segments, hexagonal, diagonal 502 mm precision  = 0.03 mrad 2) plane mirrors 40 segments, square, 437 x 437 mm2 precision  = 0.03 mrad both  5 % of X0 M. Laub, CERN EP/TA2

  3. Set-up for dimensional measurements Measurement of thickness anddimension M. Laub, CERN EP/TA2

  4. Photos of the set-up M. Laub, CERN EP/TA2

  5. Photos of the set-up Point source 16-bit CCD Stepping motor CCD for spot positioning M. Laub, CERN EP/TA2

  6. Glass (Simax) mirrors COMPASS mirrors : 65 hexagonal 1 prototype of pentagonal Manufactured by IMMA Turnov (CZ) Parameters : R = 6600 mm diagonal 521.9 mm thickness 7 mm  5.5 % of X0 weight 2.77 kg M. Laub, CERN EP/TA2

  7. 451.5 Results Dimensions inside range of 1 mm : Average = 451.6 mm  = 0.3 mm Thickness : average =7.0 mm  = 0.3 mm Radius of curvature measurement, example: COMPASS mirror No. 009 R = 6626 mm M. Laub, CERN EP/TA2

  8. Results on 65 COMPASS mirrors Radius of curvature R : average = 6605 mm std. deviation = 23 mm M. Laub, CERN EP/TA2

  9. Results Measurement of average precision of spherical surface - parameter D0 D0 = diameter inside which 95 % of reflected light is focused For R = 6.6 m 1 mm  0.08 mrad Example : M. Laub, CERN EP/TA2

  10. Results on 65 COMPASS mirrors Parameter D0 : average = 1.8 mm   = 0.03 mrad std. deviation = 0.5 mm M. Laub, CERN EP/TA2

  11. Results from pentagonal prototype Radius of curvature R = 6580 mm Parameter D0 = 2.32 mm   = 0.04 mrad M. Laub, CERN EP/TA2

  12. Beryllium mirror 1 prototype, round Provided by IHEP R = 8 m  280 mm thickness : 5 mm of Be + 1 mm of glass + ribs 20 mm of Be in average 3.3 % of X0 (2.2  7.9 %) weight 950 g M. Laub, CERN EP/TA2

  13. Results Radius of curvature R = 7926 mm Precision of spherical surface D0 = 0.85 mm   = 0.01 mrad D0 = 0.85 mm M. Laub, CERN EP/TA2, 14.9.2000 M. Laub, CERN EP/TA2

  14. Composite mirror 1 prototype, rectangular, 460 x 350 mm2 Provided by INFN Parameters : R  0.9 m total thickness 10 mm : 2 mm of plexiglass 8 mm of Nomex honeycomb 2 layers of carbon fibres  less than 1 % of X0(estimation) weight 400 g M. Laub, CERN EP/TA2

  15. Conclusion Available possibilities for : RICH-1 : glass (6 mm)  4.7 % of X0 Be (5 mm + 1 mm of glass)  2.2 % of X0 composite (10 mm)  < 1 % of X0 RICH-2 : glass (6 mm)  4.7 % of X0 M. Laub, CERN EP/TA2

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