KOPIO meeting, T. Nomura (Kyoto U.)

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Presentation transcript:

KOPIO meeting, T. Nomura (Kyoto U.) Catcher Scope of subsystem Current specification from physics Current design Open issues Resources May 14, 2004 KOPIO meeting, T. Nomura (Kyoto U.)

KOPIO meeting, T. Nomura (Kyoto U.) Scope of subsystem “Photon veto inside/near the beam at downstream end” TASK Detect photons from KL decays passing through the beam hole Be insensitive to a vast amount of unwanted neutrons SOLUTION  Utilize Cherenkov radiation Lead and aerogel tile sandwich counter inside the beam named “catcher” Lead and acrylic slab sandwich counter near the beam named “guard counter” May 14, 2004 KOPIO meeting, T. Nomura (Kyoto U.)

KOPIO meeting, T. Nomura (Kyoto U.) Scope of subsystem aerogel flat mirror Cerenkov light lead sheet 5inch PMT Module funnel CATCHER Lead and aerogel tile counter Avoid detection of slow particles from neutron interactions Distributed arrangement Coincidence along the beam helps us catch forward g only g red: e+/e-, blue: photon Photon’s EM shower in the module array May 14, 2004 KOPIO meeting, T. Nomura (Kyoto U.)

Current specification from physics Photon Efficiency Energy spectrum of photons which go into the catcher after canonical kinematical cuts (Kp2; dominated by odd pairing events) >98% for 300MeV photons >99% for more energetic ones Sensitivity to neutrons, KLs To avoid false vetoes by beam neutrons and surviving KLs… <0.3% for neutrons with Ekin=800MeV KL decaying in the catcher ends up to be detected, but false veto probability should be kept less than a few % May 14, 2004 KOPIO meeting, T. Nomura (Kyoto U.)

Current design Overview Guard counter Catcher beam May 14, 2004 KOPIO meeting, T. Nomura (Kyoto U.)

Current design of a module Elements / Optics Parameters of each module To get more Cherenkov lights To simplify optics for easy production TDR Current Aerogel 5cm-thick 20cm sq. 30cm sq. n=1.03 (SP-30) n=1.05 (IY-46) Mirror Parabolic Flat PMT / Funnel 5-inch dia. PMT Winstone-type cone Inclined Upright TDR design Current design May 14, 2004 KOPIO meeting, T. Nomura (Kyoto U.)

Current design of whole catcher Configuration Distributed arrangement Module size: 30cm x 30cm Pb converter: 2mmt per layer Number of modules: 370 10-20 in horizontal with beam divergence 25 layers along beam (8.3 X0 in total) Z gap between layers: 35cm Coincidence condition >= 4 p.e. in 1st layer (A) >= 2 p.e. in 2nd layer (B) Top view Line from opp. edge at the end of DV Beam envelop 12m downstream of main detector May 14, 2004 KOPIO meeting, T. Nomura (Kyoto U.)

KOPIO meeting, T. Nomura (Kyoto U.) Expected performance with current design Photon efficiency / Neutron sensitivity Average over +/- 10cm(y), normal incident to Catcher Photon efficiency Photon energy (GeV) 0.2 0.4 0.6 0.8 1.0 1.2 >99% @ 300MeV 95 90 85 100 Neutron sensitivity 0.3% @ 0.8GeV Neutron energy (GeV) 0.5 1.0 1.5 2.0 2.5 3.0 10-2 10-3 10-4 10-5 May 14, 2004 KOPIO meeting, T. Nomura (Kyoto U.)

Expected performance with current design Efficiency map Efficiency as a function of incident position Eg=300MeV Incident angle depending on position (gs from downstream end of DV) Beam core @ Catcher front X position dependence Y position dependence May 14, 2004 KOPIO meeting, T. Nomura (Kyoto U.)

Current design Guard counter Counter to cover the halo region Soft but many neutrons around the beam Lead & acrylic slab sandwich Size: 15cm x 15cm 8 layers of 2mm Pb + 10mm acrylic Read by 5 inch PMT 2 modules along the beam Number of modules: 96 Side View beam Front View May 14, 2004 KOPIO meeting, T. Nomura (Kyoto U.)

KOPIO meeting, T. Nomura (Kyoto U.) Expected performance with current design Efficiency map with guard counter Efficiency as a function of incident position Eg=300MeV Incident angle depending on position (gs from downstream end of DV) Y position dependence Beam core @ Catcher front Catcher + Guard May 14, 2004 KOPIO meeting, T. Nomura (Kyoto U.)

Justification of the conceptual design Prototypes so far 1/4 size, flat mirror light yield Prototype 2 (2002-3) 1/4 size, parabolic mirror response to proton (as substitute for neutron) Check single layer eff. / two-layers’ coincidence Good agreement with MC (with gas scintillation) PT1 May 14, 2004 KOPIO meeting, T. Nomura (Kyoto U.)

Issues Harmful influence of beam particles False vetoes due to neutrons, KLs Catcher size: 1.5 times larger than TDR design False veto prob. also increases Sensitivity to KL including Decay in front of the catcher Decay in the catcher  dominant Interactions in the catcher n flux Flux*sensitivity integrated TDR Current By neutron 1.8% 3.0% By KL 1.2% 2.4% assuming DT (time window)=2ns May 14, 2004 KOPIO meeting, T. Nomura (Kyoto U.)

Issues Harmful influence of beam particles Blindness by prompt photons, early neutrons and KLs Possible to hide photons of background decays Need double pulse separation by a waveform digitizer How can we separate them? What resolution? Seriousness of prompt photons depend on their energy Need photon spectrum and yield with a spoiler in the beam High counting rate by neutrons PMTs of the catcher will suffer from high rate signals Need a stabilized base False veto, counting rate of the guard counter Must be evaluated with halo yield and spectrum All the above issues highly depends on the production angle No margin now. May 14, 2004 KOPIO meeting, T. Nomura (Kyoto U.)

Resources Manpower and funds Kyoto University N. Sasao (subsystem manager) : a bit T. Nomura : 60-70% Graduated students : 100% H. Morii, H. Yokoyama, T. Shirai, N. Taniguchi, + (1 or 2) Other institutes in Japan R. Takashima (Kyoto U of Education), M. Kobayashi (KEK), … Fund in JFY2004 plan to make a full-size prototype Japan-US: 45k$ approved Grant-in-aid for the priority area: 240k$ May 14, 2004 KOPIO meeting, T. Nomura (Kyoto U.)