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Could CKOV1 be come RICH?

Could CKOV1 be come RICH?. Gh. Grégoire. October 19, 2005. Contents. 1. Simulations. 2. Sensitive area of the detection plane. 3. Example of a workable solution. 4. Geometrical efficiency of the photon detecting plane. 5. Conclusion. Focusing geometries.

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Could CKOV1 be come RICH?

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  1. Could CKOV1 become RICH? Gh. Grégoire October 19, 2005 Contents 1. Simulations 2. Sensitive area of the detection plane 3. Example of a workable solution 4. Geometrical efficiency of the photon detecting plane 5. Conclusion

  2. Focusing geometries Non exhaustive ! Very preliminary ! Not optimized Goal: Č light produced at the focus to get a parallel beam after reflection and placing the detecting plane perpendicularly (for easy simulation/reconstruction)  400 mm 1200 mm 1200 mm Spherical mirror Parabolic mirror Spheroidal mirror R=-1100 mm Rcurv=-1500 mm Rcurv= -600 mm along X Plane mirror e = 0 e = -1 Rcurv=-1100 mm along Y More x-focusing obviously needed ! 2

  3. Simulations • Particles Muons, pions and electrons (10 kevts each) • Momenta 190 to 280 MeV/c ( in steps of 10 MeV/c ) • Gaussian beams sx-y = 50 mm From S. Kahn’s presentation, Phone conf. March 31, 2005 sx’-y’ = 25 mrad • Water radiator 20-mm thick n=1.33 Index not too high to decrease size of rings Index not too low to get enough photoelectrons Diameter = 250 mm • (Spheroidal) biconic mirror at 45° (curvatures not optimized) 3

  4. Full beam Muons only 190 MeV/c 280 MeV/c Biconic mirror ( not optimized ) Losses < 5 10-4 700 mm 700 mm Faint ring due to aberrations … 700 mm 700 mm Pixel size 1 mm x 1 mm • The detecting plane does not have to be sensitive over the full area • For all muon momenta covered by MICE, 135 < Radius of Č rings < 275 mm For all impact positions and directions at the radiator 4

  5. Detection element Just an example ! Not a proposal ! Imagine the detection plane is equiped with multianode PMTs like Hamamatsu H7600. Hamamatsu assembly H8711 based on R7600 multianode PMT Square PM 26 x 26 mm 16 pixels 4 x 4 mm each Gain 3.5 106 12 stages bialkali 300 < l < 600 nm 5

  6. Detection plane Annular coverage 270 mm < D < 550 mm 6

  7. Detected photons For Cherenkov rings, originating from muons hitting any position on the radiator Nr of photons reaching the detection plane = 89 Average nr of anodes hits = 79 assuming 100% light collection efficiency (for muons of 280 MeV/c) Geometrical efficiency =89 % 7

  8. Conclusion With a rough granularity of the photon detecting plane 1. One still gets enough photons to determine the radii of the rings 2. Next task: • define a simple algorithm to identify pions from muons • check that p-m separation at analysis level is still acceptable This is still a feasibility study confirming that CKOV1 could be made RICH To become a serious design work it needs - a lot of optimization - detailed studies of aberrations with particles off axis - to ease the simulation and analysis - but aberrations will not destroy the separation possibilities - the choice of a photon detection technique 8

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