kopio catcher system rsvp preliminary baseline review brookhaven national laboratory april 6, 2005...
DESCRIPTION
April 6-8, 2005 Tadashi Nomura (Kyoto U.) RSVP Preliminary 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 SCOPETRANSCRIPT
KOPIO Catcher System
RSVP Preliminary Baseline ReviewBrookhaven National Laboratory
April 6, 2005Tadashi Nomura (Kyoto U.)
April 6-8, 2005 Tadashi Nomura (Kyoto U.) RSVP Preliminary Baseline Review 2
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 KLs
Required photon efficiency– 99% for photons with E>300MeV
• From the spectrum of photons into the catcher after kinematical cuts (dominated by K2 odd pairing events)
Sensitivity to neutrons– <0.3% for neutrons with Ekin=800MeV
SCOPE
April 6-8, 2005 Tadashi Nomura (Kyoto U.) RSVP Preliminary Baseline Review 3
Concept of Catcher System
SOLUTION– Utilize Cherenkov radiation
• Lead and aerogel tile sandwich counter inside the beamnamed “Aerogel Catcher”
• Lead and acrylic slab sandwich counter near the beamnamed “Guard Counter”
aerogel mirror
Cerenkov light
lead sheet
5inch PMTAerogel Catcher Module
Winston-type funnel
Guard CounterConcept
SCOPE
April 6-8, 2005 Tadashi Nomura (Kyoto U.) RSVP Preliminary Baseline Review 4
Principle of Aerogel CatcherAEROGEL 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 PMTModule
funnel
red: e+/e-, blue: photon
Photon’s EM shower in the module array
AEROGEL CATCHER
April 6-8, 2005 Tadashi Nomura (Kyoto U.) RSVP Preliminary Baseline Review 5
Principle of Guard CounterGUARD COUNTER
• Lead and acrylic slab counter• Slow particle doesn’t emit Cherenkov light
• Utilize the total reflection anglein light transportation
• Cherenkov lights from slow particlesdon’t fulfill the total reflection condition
Photon Neutron
GUARD COUNTER
April 6-8, 2005 Tadashi Nomura (Kyoto U.) RSVP Preliminary Baseline Review 6
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 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
12m downstream of main detector
Beam envelope
AEROGEL CATCHER
Module
April 6-8, 2005 Tadashi Nomura (Kyoto U.) RSVP Preliminary Baseline Review 7
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
April 6-8, 2005 Tadashi Nomura (Kyoto U.) RSVP Preliminary Baseline Review 8
Expected Photon EfficiencyEXPECTED PERFORMANCE
Aerogel Catcher Efficiency
Y position dependence
99% @ 300MeV
April 6-8, 2005 Tadashi Nomura (Kyoto U.) RSVP Preliminary Baseline Review 9
Efficiencies for Other NeutralsEXPECTED PERFORMANCE
Hit probability for Neutrons
0.3% @ 800MeV
Hit probability for KLs
Dominated by decays in the Catcher
April 6-8, 2005 Tadashi Nomura (Kyoto U.) RSVP Preliminary Baseline Review 10
Proof of PrinciplePrototype 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’ coincidenceGood agreement
with MC(with gas scintillation)
PT2PT1
PROOF OF PRINCIPLE
April 6-8, 2005 Tadashi Nomura (Kyoto U.) RSVP Preliminary Baseline Review 11
Cost SummaryCOST
Catcher System covered by the contribution from Japan• Japan-US fund• Labor provided by
graduate students
April 6-8, 2005 Tadashi Nomura (Kyoto U.) RSVP Preliminary Baseline Review 12
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
April 6-8, 2005 Tadashi Nomura (Kyoto U.) RSVP Preliminary Baseline Review 13
Costs of Key Components (2)
5 inch Photomultiplier– WBS 1.2.6.1.1.3.1
for Aerogel Catcher735 k$
– WBS 1.2.6.2.1.3.1for Guard Counter
252 k$
Catalog price with usual discount
for mass production(quoted by Hamamatsu)
COST
April 6-8, 2005 Tadashi Nomura (Kyoto U.) RSVP Preliminary Baseline Review 14
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 ProductionDone in March
COST
April 6-8, 2005 Tadashi Nomura (Kyoto U.) RSVP Preliminary Baseline Review 15
ScheduleSCHEDULE
April 6-8, 2005 Tadashi Nomura (Kyoto U.) RSVP Preliminary Baseline Review 16
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
April 6-8, 2005 Tadashi Nomura (Kyoto U.) RSVP Preliminary Baseline Review 17
Cost Profile
FY2005FY2006 178k$ 1/6 of AC PMTFY2007 1380k$
829k$551k$
5/6 of AC PMTHalf of Aerogel/optical components
FY2008 1389k$655k$421k$245k$
Half of Aerogel/optical componentsGuard CounterHalf of Front End Electronics
FY2009 204k$188k$ Half of FEE
COST & SCHEDULE