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

KOPIO Catcher System

RSVP Baseline ReviewBrookhaven National Laboratory

April 20, 2005Noboru Sasao / Tadashi Nomura

(Kyoto U.)

April 20-22, 2005 Noboru Sasao / Tadashi Nomura (Kyoto U.) NSF RSVP 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 (do

minated by K2 odd pairing events)

Sensitivity to neutrons

– <0.3% for neutrons with Ekin=800MeV

SCOPE


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


4

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 PMTModule

funnel

red: e+/e-, blue: photon

Photon’s EM shower in the module array

AEROGEL CATCHER


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Principle of Guard Counter

GUARD 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


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


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


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Expected Photon EfficiencyEXPECTED PERFORMANCE

Aerogel Catcher Efficiency

Y position dependence

99% @ 300MeV


9

Efficiencies for Other NeutralsEXPECTED PERFORMANCE

Hit probability for Neutrons

0.3% @ 800MeV

Hit probability for KLs

Dominated by decays in the Catcher


10

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

Cost SummaryCOST

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

• Labor provided by graduate students


12

Example of Level 5 ItemsCOST

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

Dictionary and Risk AnalysisCOST

Aerogel Counter – Modules (WBS1.2.6.1.1)


14

Costs of Key Components (1)

Aerogel tile

– WBS 1.2.6.1.1.1860 k$

Catalog price by Matsushita

Risk The price of new, transparent tiles (YI-50) not fixed yet

COST


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5 inch Photomultiplier

– WBS 1.2.6.1.1.3.1 for Aerogel Catcher

735 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


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Winston-type funnel

– WBS 1.2.6.1.1.5191 k$

Unofficial quotation by Vendor (Yokohama Kikou Co.Ltd.)

E-mail communication

Test ProductionDone in March

COST


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Labor SummaryCOST


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ScheduleSCHEDULE


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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


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Cost ProfileFY2005

FY2006 178k$ 1/6 of AC PMT

FY2007 1380k$ 829k$ … 5/6 of AC PMT

551k$ … Half of Aerogel/optical components

FY2008 1389k$ 655k$ …Half of Aerogel/optical components

421k$ … Guard Counter

245k$ … Half of Front End Electronics

FY2009 204k$ 188k$ … Half of FEE

$0

$200,000

$400,000

$600,000

$800,000

$1,000,000

$1,200,000

$1,400,000

Co

st/

FY

FY2005 FY2006 FY2007 FY2008 FY2009 FY2010 FY2011

FY

KOPIO 1.2.6; Cost in FY05 $s

KYO_LV

KYO_HV

KYO_SS

KYO_MTE

KYO_ETE

KYO_ EE

COST & SCHEDULE


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Cost Profile in Japan-US Fund

US FY Sum total

2005

2006 178k$ 178k$

2007 1380k$ 1558k$

2008 1389k$ 2947k$

2009 204k$ 3151k$

COST & SCHEDULE

JFY Sum total

2005 330k$ 330k$

2006 660k$ 990k$

2007 770k$ 1760k$

2008 770k$ 2530k$

2009 440k$ 2970k$

Approved on condition:

RSVP must start

Additional funding from Grant-in-Aid for Science

Documents

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