KOPIO Catcher System RSVP Preliminary Baseline Review Brookhaven National Laboratory April 6, 2005...

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


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


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


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


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


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


Expected Photon EfficiencyEXPECTED PERFORMANCE

Aerogel Catcher Efficiency

Y position dependence

99% @ 300MeV


Efficiencies for Other NeutralsEXPECTED PERFORMANCE

Hit probability for Neutrons

0.3% @ 800MeV

Hit probability for KLs

Dominated by decays in the Catcher


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


Cost SummaryCOST

Catcher System covered by the contribution from Japan• Japan-US fund• Labor provided by

graduate students


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



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



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


ScheduleSCHEDULE


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


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

KOPIO Catcher System RSVP Preliminary Baseline Review Brookhaven National Laboratory April 6, 2005...

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