1. KOPIO Catcher System RSVP Baseline Review Brookhaven National Laboratory April 20, 2005 Noboru Sasao / Tadashi Nomura (Kyoto U.)

2. April 20-22, 2005 Noboru Sasao / Tadashi Nomura (Kyoto U.) NSF RSVP Baseline Review2 Scope of Catcher System TASK –Detect photons passing through the beam hole –Be insensitive to a vast amount of neutrals in the beam In order to avoid false vetoes by beam neutrons and surviving K L s Required photon efficiency –99% for photons with E>300MeV From the spectrum of photons into the catcher after kinematical cuts (dominated by K  2 odd pairing events) Sensitivity to neutrons –<0.3% for neutrons with Ekin=800MeV SCOPE

3. April 20-22, 2005 Noboru Sasao / Tadashi Nomura (Kyoto U.) NSF RSVP Baseline Review3 Concept of Catcher System SOLUTION –Utilize Cherenkov radiation Lead and aerogel tile sandwich counter inside the beam named “Aerogel Catcher” Lead and acrylic slab sandwich counter near the beam named “Guard Counter ” aerogel mirror Cerenkov light lead sheet 5inch PMT Aerogel Catcher Module Winston-type funnel Guard Counter Concept SCOPE

4. April 20-22, 2005 Noboru Sasao / Tadashi Nomura (Kyoto U.) NSF RSVP Baseline Review4 Principle of Aerogel Catcher AEROGEL CATCHER Lead and aerogel tile counter Avoid detection of slow particles from neutron interactions Distributed arrangement Coincidence along the beam helps us catch forward  only aerogel flat mirror Cerenkov light lead sheet 5inch PMT Module funnel  red: e + /e -, blue: photon Photon’s EM shower in the module array AEROGEL CATCHER

5. April 20-22, 2005 Noboru Sasao / Tadashi Nomura (Kyoto U.) NSF RSVP Baseline Review5 Principle of Guard Counter GUARD COUNTER Lead and acrylic slab counter Slow particle doesn’t emit Cherenkov light Utilize the total reflection angle in light transportation Cherenkov lights from slow particles don’t fulfill the total reflection condition PhotonNeutron GUARD COUNTER

6. April 20-22, 2005 Noboru Sasao / Tadashi Nomura (Kyoto U.) NSF RSVP Baseline Review6 Aerogel Counter (WBS 1.2.6.1) In-beam Pb-Aerogel Sandwich –Module size: 30cm x 30cm –Pb converter: 2mm per layer –Number of modules: 420 12-21 in horizontal with beam divergence 25 layers along beam (8.3 X 0 in total) –Z gap between layers: 35cm –Coincidence condition >= 4 p.e. in 1 st layer (A) >= 2 p.e. in 2 nd layer (B) Top view 12m downstream of main detector Beam envelope AEROGEL CATCHER Module

7. April 20-22, 2005 Noboru Sasao / Tadashi Nomura (Kyoto U.) NSF RSVP Baseline Review7 Guard Counter (WBS 1.2.6.2) Pb-Acrylic sandwich to cover the halo region Many soft neutrons around the beam Lead & acrylic slab sandwich –Size: 15cm x 15cm –8 layers of 2mm Pb + 10mm acrylic –Read by 5 inch PMT –3 modules along the beam –Number of modules: 144 Side View Front View beam Module GUARD COUNTER

8. April 20-22, 2005 Noboru Sasao / Tadashi Nomura (Kyoto U.) NSF RSVP Baseline Review8 Expected Photon Efficiency EXPECTED PERFORMANCE Aerogel Catcher Efficiency Y position dependence 99% @ 300MeV

9. April 20-22, 2005 Noboru Sasao / Tadashi Nomura (Kyoto U.) NSF RSVP Baseline Review9 Efficiencies for Other Neutrals EXPECTED PERFORMANCE Hit probability for Neutrons 0.3% @ 800MeV Hit probability for KLs Dominated by decays in the Catcher

10. April 20-22, 2005 Noboru Sasao / Tadashi Nomura (Kyoto U.) NSF RSVP Baseline Review10 Proof of Principle Prototype 1 (2001-2) –1/4 size, flat mirror light yield Prototype 2 (2002-3) –1/4 size, parabolic mirror light yield response to proton (as substitute for neutron)  Check single layer eff. / two-layers’ coincidence  Good agreement with MC (with gas scintillation) PT2 PT1 PROOF OF PRINCIPLE

11. April 20-22, 2005 Noboru Sasao / Tadashi Nomura (Kyoto U.) NSF RSVP Baseline Review11 Cost Summary COST Catcher System covered by the contribution from Japan Japan-US fund Labor provided by graduate students

12. April 20-22, 2005 Noboru Sasao / Tadashi Nomura (Kyoto U.) NSF RSVP Baseline Review12 Example of Level 5 Items COST Aerogel Counter – Modules (WBS1.2.6.1.1) Cost dominated by Aerogel Tile (1.2.6.1.1.1) and PMT (1.2.6.1.1.3)

13. April 20-22, 2005 Noboru Sasao / Tadashi Nomura (Kyoto U.) NSF RSVP Baseline Review13 Dictionary and Risk Analysis COST Aerogel Counter – Modules (WBS1.2.6.1.1)

14. April 20-22, 2005 Noboru Sasao / Tadashi Nomura (Kyoto U.) NSF RSVP Baseline Review14 Costs of Key Components (1) Aerogel tile –WBS 1.2.6.1.1.1 860 k$  Catalog price by Matsushita  Risk The price of new, transparent tiles (YI-50) not fixed yet COST

15. April 20-22, 2005 Noboru Sasao / Tadashi Nomura (Kyoto U.) NSF RSVP Baseline Review15 Costs of Key Components (2) 5 inch Photomultiplier –WBS 1.2.6.1.1.3.1 for Aerogel Catcher 735 k$ –WBS 1.2.6.2.1.3.1 for Guard Counter 252 k$  Catalog price with usual discount for mass production (quoted by Hamamatsu) COST

16. April 20-22, 2005 Noboru Sasao / Tadashi Nomura (Kyoto U.) NSF RSVP Baseline Review16 Costs of Key Components (3) Winston-type funnel –WBS 1.2.6.1.1.5 191 k$  Unofficial quotation by Vendor (Yokohama Kikou Co.Ltd.) E-mail communication  Test Production Done in March COST

17. April 20-22, 2005 Noboru Sasao / Tadashi Nomura (Kyoto U.) NSF RSVP Baseline Review17 Labor Summary COST

18. April 20-22, 2005 Noboru Sasao / Tadashi Nomura (Kyoto U.) NSF RSVP Baseline Review18 Schedule SCHEDULE

19. April 20-22, 2005 Noboru Sasao / Tadashi Nomura (Kyoto U.) NSF RSVP Baseline Review19 Schedule Summary Schedule and Milestones (2006/07 – 2009/07) –2006/07 – 2008/09 … Aerogel Counter (WBS 1.2.6.1) 2008/06/30 Aerogel tile production completed 2007/09/27 Delivery of 420 5-inch PMTs completed 2008/04/01 Winston-type funnel completed –2007/10 – 2008/09 … Guard Counter (WBS 1.2.6.2) 2008/06/30 Delivery of 144 PMTs completed –2008/04 – 2009/01 … Front End Electronics (WBS 1.2.6.3) 2009/01/30 WFD fabrication completed –2007/12 – 2008/12 … Shipping (WBS 1.2.6.4) –2008/10 – 2009/04 … Installation (WBS 1.2.6.5) 2009/04/30 Installation completed –2009/06 – 2009/07 … Commissioning (WBS 1.2.6.6) SCHEDULE

20. April 20-22, 2005 Noboru Sasao / Tadashi Nomura (Kyoto U.) NSF RSVP Baseline Review20 Cost Profile FY2005 FY2006178k$1/6 of AC PMT FY20071380k$829k$ … 5/6 of AC PMT 551k$ … Half of Aerogel/optical components FY20081389k$655k$ …Half of Aerogel/optical components 421k$ … Guard Counter 245k$ … Half of Front End Electronics FY2009204k$188k$ … Half of FEE COST & SCHEDULE

21. April 20-22, 2005 Noboru Sasao / Tadashi Nomura (Kyoto U.) NSF RSVP Baseline Review21 Cost Profile in Japan-US Fund US FYSum total 2005 2006178k$ 20071380k$1558k$ 20081389k$2947k$ 2009204k$3151k$ COST & SCHEDULE JFYSum total 2005330k$ 2006660k$990k$ 2007770k$1760k$ 2008770k$2530k$ 2009440k$2970k$ Approved on condition: RSVP must start Additional funding from Grant-in-Aid for Science