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Feasibility Study of CKOV1 Design for RICH Applications in Particle Detection

This document presents a preliminary feasibility study on the CKOV1 detector's capability to function as a Ring Imaging Cherenkov (RICH) detector. Key areas of discussion include simulations of particle interactions (muons, pions, electrons), configuration of detection planes, and geometrical efficiency in capturing Cherenkov rings. Various mirror geometries (spherical, parabolic, spheroidal) and their roles in optimizing photon collection are explored. The study suggests that despite initial losses and aberrations, the CKOV1 design could effectively identify pions from muons, pending further optimization and analysis.

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Feasibility Study of CKOV1 Design for RICH Applications in Particle Detection

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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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