PRISM/PRIMEprism.phys.sci.osaka-u.ac.jp/papers/slides/20030516...2003/05/16 · 2003/5/17 NuFactJ03@東京 ±立大 PRISM Scheme pulsed proton beam pion capture by high solenoid field

PRISM/PRIME

Akira SATOOsaka University

2003/5/17 NuFactJ03@東京立大

ContentsPRISM projectDesignR&D status

PRIMEμ-e conversionDetector

StagingSummary

PRISM project

DesignR&D status


PRISMPhase Rotation Intense Slow Muon source

intensity :1011-1012m±/secmuon 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

secondary muon beam channelwithhigh intensity

Superconducting Solenoid Magnet

narrow energy spreadHigh purity

Phase rotation

for stopped muon　experiments.


PRISM Schemepulsed proton beampion capture by highsolenoid fieldpion decay sectionphase rotationsection


Phase RotationPhase Rotation = decelerate particleswith high energy and accelerate particle withlow energy by high-field RF

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

energyenergy

time time


FFAG as Phase Rotator

synchrotron oscillation for phase rotationnot cyclotron (isochronous)

large momentum acceptancelarger than synchrotron± several 10 % is aimed

large transverse acceptancestrong focusinglarge horizontal emittancereasonable vertical emittance at lowenergy

Fixed Field Alternating Gradient Synchrotron


PRISM layoutPion capture sectionDecay sectionPhase rotation section

FFAG Baseda ring instead of linear systems

reduction of # of rf cavitiesreduction of rf powerconsumptioncompact

not in scale


Proton driver - PRISM -Joint Project was approved!High intensity0.75 MW1014proton/secUpgradable to 4x1014proton/sec

A narrow bunchedNew Fast extraction line is necessary Fast Extraction

Slow Extraction


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)


Beam experiment with R&D Magnet

Beam test with R&D magnetDirect measurement of heatload by radiationStudy behavior of magnetunder heating condition

R&D Magnet10 T hybrid SC coilCryo coolerHe freeCompact

Y. Kuno, A. YamamotoKEK PS12 GeV proton1011 proton/s


Beam test with Coil mockup


Simulation studies of phase rotator

012

3

4

5

GEANT3.21 simulationFFAG Acceptance, Phase rotationMuon yield, background rate

m-

RF : 5MHz, 250kV/mΔE/E = 20MeV+4%-5%


1 0

3

2

4

phase(nsec)-100 -50 05 0 100

-2000

-1500

-1000

-500

0

500

1000

1500

2000

wave136.dat

phase(nsec )-100 - 500 50 100

-300

-200

-100

0

100

200

300

x / L + -0.1569)pE = 350.00 sin( 1

Wave Comp.

phase (nsec )-100 - 500 50 100

-300

-200

-100

0

100

200

300

x / L + -0.6647)pE = -275.00 sin( 2

Wave Comp.

phase (nsec )-100 - 500 50 100

-300

-200

-100

0

100

200

300

x / L + -0.1569)pE = 350.00 sin( 1

Wave Comp.

phase (nsec )-100 - 500 50 100

-300

-200

-100

0

100

200

300

x / L + -0.6647)pE = -275.00 sin( 2

Wave Comp.

phase (nsec )-100 - 500 50 100

-300

-200

-100

0

100

200

300

x / L + -0.1569)pE = 350.00 sin( 1

Wave Comp.

phase (nsec )-100 - 500 50 100

-300

-200

-100

0

100

200

300

x / L + -0.9085)pE = 250.00 sin( 3

Wave Comp.

①

①

①②

②

③

①①

①

①①

①

②

②

②

②③

③

†

V (t) = Ansin(npt /L + Bn )n=1

3

Â

Saw Tooth RF(H=1,2 and 3) by MA Cavity(1MHz).2kV

Saw Tooth RF


Phase Rotation Simulation:Horizontal Phase Space

Initial Phase

After 1 turn

After 2turns

After 3turns

After 4 turns

After 5turns

54.4 61.2 68.0 74.8 81.6MeV/c

Horizontal Acceptance 10000pi mm mrad


0 205 10 15 05

101

5

(m)

電磁石電源

高周波電源

高周波増幅器

入射光学系

取り出し光学系粒子検出器

輝度化技術の実証位相空間回転イオン化ビーム冷却

開発要素加速勾配ＲＦ大アクセプタンス磁石

PRISM-FFAGリング建学術創成科研費：平成１５年度~平成１９年度「ミューオン物理学の新展開を狙うスーパー・ミューオン・ビームの研究」


5MHz 場勾配RFの開発Possible CandidatesMagnetic Alloy (MA)Low Q (0.6)-HighQ(>20)40-50kV / gap, -200kV/m

Ferrite with High QNeed R&D

Ceramic Cavity40kV/gap, >200kV/mNeed R&D Cooling

# of cores

Impedance

Gaps/cavity

Fieldgradient

Power tube

Air cooling

4 cores /gap（2.5-３ｃｍコア）

1k W/gap　以上

1 gaps, 31.25-kV/gap, 25cm

62.5- kV/cavity250- kV/m

EIMAC 4CW150KDC35-40kV900-kW(peak)

PRISM RF Plan


PRISM RFプラン極源クローバ

空洞空洞空洞空洞

補助源

アンプコンデンサ




駆動段アンプ


Multi coil方式短所デザイン難力大

所Flat gap, gap大可、

→アクセプタンス大k値可変

Gap方式所デザイン容易力小

短所Gap大不可

→アクセプタンス小

k値不可変

磁石ポール形状PoP150-MeV京大原子炉

PRISM-FFAG


Acceptance SimulationsLargeLarge


0 205 10 15 05

101

5

(m)

電磁石電源

高周波電源

高周波増幅器

入射光学系

取り出し光学系粒子検出器

PRISM-FFAG Schedule平成１５年度

ビーム・ラティス、磁石ＲＦテスト(1gap)

平成１６年度ＲＦテスト(4gap)磁石磁場測定(1台)

平成１７年度ＲＦテスト(4gap)磁石磁場測定(7台)

測量、磁石配置リング建

平成１８年度コミッショニング位相回転実証実験

平成１９年度イオン化冷却実証実験


Muon Factory @ KEK/JAERI Joint Project

Muon LFVMuon EDMMuon g-2


Site Layout Proposal

Muon g-2

Muon-LFV & Muon-EDM


Site Layout Proposal (Cont.)

Muon-LFVMuon-EDM

Muon g-2


Application List with PRISMParticle, NuclearPhysicsLepton flavorviolation

me conversion,m+ m- conversion

m life time

g-2

Material ScienceMuonic X-ray, m sR

ArcheologyLife scienceLiving cellBrain scan

PRIMEPRISM Mu E conversion


Lepton Flavor Violation (LFV)LFV physics attracts a lot attentionNeutrino mass g-2 new result

LFV process in charged sectorProbes beyond standard modelflavor mixing (Slepton)

m ˜ e ̃ e 2 Dm ˜ e ̃ m

2 Dm˜ e ̃ t

2

Dm ˜ m ̃ e 2 m ˜ m ̃ m

2 Dm ˜ m ̃ t

2

Dm˜ t ̃ e 2 Dm ˜ t ̃ m

2 m ˜ t ˜ t

2

Ê

Ë

Á Á Á

ˆ

¯

˜ ˜ ˜

sensitive to slepton mixing


10- 1 4

10- 1 2

10- 1 0

10- 8

10- 6

10- 4

10- 2

1940 1950 1960 1970 1980 1990 2000

Upper limits of Branching Ratio

Y e a r

KL0 Æ me

K+ Æ pme

mAÆeA

m Æ eee

m Æ eg

History of LFV Search limits

Search forthe Lepton Flavor Violating Process

No evidence so far for chargedleptonLimits have been improvedsteadilytwo orders of magnitude perdecade

Sensitivities are superb in muonsystems

Getting harderTo obtain/handle moreintense muon


mÆe conversion in a Muonic Atom

muonic atom (1s state)

neutrinoless muon nuclear capture (= m-e conversion)

muon decay in orbit

nucleus m-

nuclear muon capture

lepton flavors changes by one unit.

coherent process


LFV in SUSY GUT

MECO@BNL,MEG@PSIEquivalent sensitivity

Future experimentwill cover most ofparameter space

with PRISM

Hisano et al.


Muon Decay in OrbitMuon decay in orbit (µ(Eme-Ee)5)

Ee > 103.9 MeV DEe = 350 keV NBG ̃ 0.17 @ R=10-18

present limit

MECO goal

PRIME goal

signal


Spiral Solenoid Spectrometer (SSS)Instantaneous rate1010 muon / pulse

Extract signal region onlyCurvature drift

Block unwanted particlesPositiveDIO (P<90 GeV/c)

Reduce background and single rate

†

D =1./(0.3B) ¥ s /R ¥( ps

2 + 0.5pt2)

ps


PRISM muon-LFV SensitivityPRISM MECO

Intensity (muons/sec) 1.3x10^11/sec 2X10^11/sec

Muon momentum 68 ± 2 MeV/c 15-90 MeV/c

mu stopping efficiency 80% 40%

Target material Ti (life time=329 ns) Al (life time=880 ns)

Physics SensitivityB(muN=>eN)/B(mu=>eg)=

1/238B(muN=>eN)/B(mu=>eg)

=1/389

Targetarrangement 20 layers of 50 um plate(17-25) layers of200 um

plate

Spectrometer acceptance >27% 20%

Spectrometer resolution 500 keV (FWHM) 900 keV (FWHM)

Time window Full time window (100%) Delayed window (50%)

Beam Purity mu only mu, pi and e

Sensitivity 6x10^-19 2x10^-17

Remark 5 year (=10^7 sec/year)running time; Analysis eff

of 0.5 assumed.


StagingMuon Factory (PRISM,g-2)Muon LFVMuon g-2 (3 GeV/c beam line)

Muon Factory-II (PRISM-II,g-2)Muon EDMMuon g-2 (6 GeV/c beam line)

Neutrino FactoryBased on 1 MW proton beam

Neutrino Factory-IIBased on 4.4 MW proton beam

Muon Collider

Physics outcomeat each stage


Muon Acceleration based ona series of FFAGs

FFAG-based MuonAcceleration

FFAG AccelerationLarge Acceptance (eH,V,dp/p)Muon cooling is notmandatory (better ifavailable).

AdvantagesCosts savingSmall # of RF cavitiesno cooling needed.

Simple and compactLess R&D components

Four FFAG rings


Neutrino Factory at J-PARC

Schematic Layout of Nufact-J at J-PARC

20 GeV Muon Case


SummaryPRISM&PRIMESuper muon beam with new technologyLFV,stopped muon experiments

R&D WorksSuperconducting Capture SolenoidFFAG Phase rotator etc….

New Fast Extraction Beamline and Exp HallMulti purposePRISM, g-2, mu-EDM, antiproton, etc…

Staging Scenario to NuFact and muon colliderPRISM is the first step to NuFactJ

Documents

PRISM/PRIMEprism.phys.sci.osaka-u.ac.jp/papers/slides/20030516...2003/05/16 · 2003/5/17 NuFactJ03@東京 ±立大 PRISM Scheme pulsed proton beam pion capture by high solenoid field