prism/primeprism.phys.sci.osaka-u.ac.jp/papers/slides/20030516...2003/05/16 · 2003/5/17...
TRANSCRIPT
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PRISM/PRIME
Akira SATOOsaka University
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ContentsPRISM projectDesignR&D status
PRIMEμ-e conversionDetector
StagingSummary
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PRISM project
DesignR&D status
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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.
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PRISM Schemepulsed proton beampion capture by highsolenoid fieldpion decay sectionphase rotationsection
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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
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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
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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
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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
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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 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
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Beam test with Coil mockup
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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%
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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
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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
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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」
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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
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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
アンプコンデンサ
アンプコンデンサ
アンプコンデンサ
駆動段アンプ
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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
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Acceptance SimulationsLargeLarge
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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
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Muon Factory @ KEK/JAERI Joint Project
Muon LFVMuon EDMMuon 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-LFVMuon-EDM
Muon g-2
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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
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PRIMEPRISM Mu E conversion
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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
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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
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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
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LFV in SUSY GUT
MECO@BNL,MEG@PSIEquivalent sensitivity
Future experimentwill cover most ofparameter space
with PRISM
Hisano et al.
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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
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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
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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.
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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
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2003/5/17 NuFactJ03@東京 立大
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
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2003/5/17 NuFactJ03@東京 立大
Neutrino Factory at J-PARC
Schematic Layout of Nufact-J at J-PARC
20 GeV Muon Case
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2003/5/17 NuFactJ03@東京 立大
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