The PRISM project at the high-intensity proton machine project - - PowerPoint PPT Presentation

The PRISM project

at the high-intensity proton machine project Akira SATO Osaka University

2002/10/3 PANIC02@Osaka

Contents

Physics motivation PRISM Overview Design and R&D Status Summary

Physics Motivation

2002/10/3 PANIC02@Osaka

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History of LFV Search limits

Search for the Lepton Flavor Violating Process

No evidence so far for charged lepton Limits have been improved steadily two orders of magnitude per decade Sensitivities are superb in muon systems

Getting harder

To obtain/handle more intense muon

2002/10/3 PANIC02@Osaka

LFV in SUSY GUT

MECO@BNL, MEG@PSI

Equivalent sensitivity

Future experiment

will cover most of parameter space

with PRISM

Hisano et al.

PRISM project

Design R&D status

2002/10/3 PANIC02@Osaka

What is PRISM ?

Phase Rotation Intense Slow Muon source a dedicated secondary muon beam channel with

high intensity narrow energy spread High purity

for stopped muon experiments.

High Field Pion Capture Phase Rotation

2002/10/3 PANIC02@Osaka

PRISM Beam Characteristics

intensity : 1011-1012µ± /sec muon kinetic energy : 20 MeV (=68 MeV/c)

range = about 3 g

kinetic energy spread : ± 0.5-1.0 MeV

± a few 100 mg range width

beam repetition : about 100Hz

2002/10/3 PANIC02@Osaka

PRISM Scheme

pulsed proton beam pion capture by high solenoid field pion decay section phase rotation section

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Phase Rotation

Phase Rotation = decelerate particles

with high energy and accelerate particle with low energy by high-field RF

A narrow pulse structure (<1 nsec) of proton beam is needed to ensure that high-energy particles come early and low- energy one come late.

energy energy time time

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FFAG as Phase Rotator

synchrotron oscillation for phase rotation not cyclotron (isochronous) large momentum acceptance larger than synchrotron ± several 10 % is aimed large transverse acceptance strong focusing large horizontal emittance reasonable vertical emittance at low energy

Fixed Field Alternating Gradient Synchrotron

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PRISM layout

Pion capture section Decay section Phase rotation section FFAG Based

a ring instead of linear systems reduction of # of rf cavities reduction of rf power consumption compact

not in scale

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Proton driver - PRISM -

Joint Project was approved!

High intensity0.75 MW

1014proton/sec Upgradable to 4x1014proton/sec

A narrow bunched

New Fast extraction line is necessary

Fast Extraction Slow Extraction

2002/10/3 PANIC02@Osaka

Beam Extraction - PRISM -

Phase Rotator requires ̃ KHz.

1ms 100 pulse 0.1s Kicker

Slow Extraction Difficult to get < KHz Fast Extraction 100 Hz is feasible

• cf. ~ 1MHz (MECO)

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Beam experiment with R&D Magnet

Beam test with R&D magnet

Direct measurement of heat load by radiation Study behavior of magnet under heating condition

R&D Magnet

10 T hybrid SC coil Cryo cooler He free Compact

• Y. Kuno, A. Yamamoto

KEK PS

12 GeV proton 1011 proton/s

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Beam test with Coil mockup

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A brief history of FFAG Accelerator

̃50’ s FFAG was proposed by Ohkawa, Symon and Kolomensky.

a electron FFAG at MURA project. “ Proton FFAG was difficult to realize” Difficulties of designing and manufacturing the large magnet gives the complex magnetic field

FFAG magnetic Field : B=B0(r0/r)k k>1

No RF cavity has the large aperture and gives the high gradient field over a wide-frequency … Great advancement of technologies in 80’ s ̃ 90’ s large CPU power to do the calculation and the simulation easily the invention of a Magnetic Alloy for FFAG RF cavity

1998 PoP (proof of principle) FFAG project, to construct the world first proton FFAG, was started by KEK FFAG group!

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R&D for FFAG

Now under construction

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Simulation studies of phase rotator

1 2 3 4 5

using GEANT3.21 based simulation code

FFAG Acceptance, Phase rotation Muon yield, background rate

µ

RF : 5MHz, 250kV/m ΔE/E = 20MeV+4%-5%

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PRISM muon-LFV Sensitivity

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Muon Factory @ KEK/JAERI Joint Project

Muon LFV Muon EDM Muon g-2

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Site Layout Proposal

Muon g-2 Muon-LFV & Muon-EDM

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Site Layout Proposal (Cont.)

Muon-LFV Muon-EDM Muon g-2

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Staging

Muon Factory (PRISM,g-2)

Muon LFV Muon g-2 (3 GeV/c beam line)

Muon Factory-II (PRISM-II,g-2)

Muon EDM Muon g-2 (6 GeV/c beam line)

Neutrino Factory

Based on 1 MW proton beam

Neutrino Factory-II

Based on 4.4 MW proton beam

Muon Collider

Physics outcome at each stage

2002/10/3 PANIC02@Osaka

Summary

PRISM

Super muon beam with new technology LFV,stopped muon experiments

R&D Works

Superconducting Capture Solenoid FFAG Phase rotator etc….

New Fast Extraction Beamline and Exp Hall

Multi purpose

PRISM, g-2, mu-EDM, antiproton, etc…

Staging Scenario to muon collider