Download - Spin at J-PARC
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Spin at J-PARCSpin at J-PARC
Naohito Saito
for
Shoji Nagamiya
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Executive SummaryExecutive Summary
Spin physics at J-PARC, now The facility is starting up; Only spin physics would be T-reversal experiment
(E06; TREK) in the existing facility Spin physics plans in a future
Proposals for spin polarized proton beams Muon g-2 / EDM experiment Neutron EDM experiment
Collaboration Collaboration with Brookhaven National Lab
BNL - RIKEN CollaborationUS Japan framework (BNL – KEK) We are open for any other possibilities for collaboration
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Bird’s eye photo in Feb. 2008
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Proposals at MRProposals at MR
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Zoom in to ProposalsZoom in to ProposalsHyper Nuclear PhysicsHyper Nuclear Physics
Hyper Nuclear PhysicsHyper Nuclear Physics
Hyper Nuclear PhysicsHyper Nuclear Physics
Hyper Nuclear PhysicsHyper Nuclear Physics
Spin PhysicsSpin Physics
Time Reversal Spin PhysicsTime Reversal Spin Physics
Neutrino Physics
Hyper Nuclear PhysicsHyper Nuclear Physics
Hyper Nuclear PhysicsHyper Nuclear Physics
Hyper Nuclear PhysicsHyper Nuclear Physics
Exotic SearchExotic Search
K Rare Decay
Drell-YanDrell-Yan
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Polarized proton acceleration Polarized proton acceleration at J-PARCat J-PARC
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BRAHMS& PP2PP
STAR
PHENIX
AGS
LINACBOOSTER
Pol. H- Source
200 MeVPolarimeter
AGS InternalPolarimeter
rf Dipole
RHIC pCPolarimeters
Absolute Polarimeter(H jet)
AGS pC PolarimetersCold PartialHelical Siberian Snake
Warm PartialHelical Siberian Snake
PHOBOSPol. H- Source
180/400 MeV Polarimeter
rf Dipole
30% PartialHelical Siberian Snakes
pC CNI Polarimeter
Extracted BeamPolarimeter
Collaboration with BNL
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Accelerating polarized protons in Main RingAccelerating polarized protons in Main Ring Beam energy: 3 GeV ~ 50 GeV (G = 7.5 -- 97.5) Design working point: Qx = 22.339, Qy = 20.270 Many imperfection resonances Strong intrinsic resonance
4-6-2008 J-PARC Spin Physics Workshop 7
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Spin Tracking in MR Spin Tracking in MR (A. Luccio)(A. Luccio)
4-6-2008 J-PARC Spin Physics Workshop
No Snake=10 mm mradNo Snake=10 mm mrad
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With Snakes=4 mm mrad
Qx = 20.128 Qy = 20.960
Single particle tracking at the nominal tune of the lattice The polarization is lost at the resonances at G = 3N +-
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4-6-2008 J-PARC Spin Physics Workshop 9
Possible locations of partial snakes in MR
First 30% snake Second 30% snake
Courtesy of T. Roser
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Early Phase Experiments at Hadron HallEarly Phase Experiments at Hadron Hall
Handron Hall
Beam Dump
K1.8 (Fall,2009~)
K1.8BR (Dec.2008~)
K1.1
KL
K0.8
30 (→ 50) GeV primary beam
Productiontarget (T1)
Kaonic Nuclei Kaonic AtomEta meson Nuclei
Hyper-Nuclei, Hyper-NucleiSpectroscopy of Hyper-NucleiNeutron Rich Hyper-Nuclei-Atom, Pentaquark,….
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Parking Lot Solution?Parking Lot Solution?
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60 m
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Possible Extension of Hadron HallPossible Extension of Hadron Hall
To G-2 beam line
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Experimental Devices
Muon Experimental Area
Neutron Scattering Area
Materials & Life Experimental Facility
Neutron Beam Lines (23 total)Neutron Beam Lines (23 total)
Target Station
ScatteredNeutrons
Proton Beam
Proton Beam
Number of Users: about 3,000
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Muon Beam Production Area
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backupsbackups
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Muon Storage RingMuon Storage Ring BNL-E821 achieved
ultra precision as such large magnet (14 m – diameter) Local uniformity ~ 100
ppm 0.1 ppm integrated field
Smaller Ring with Hi Field just matches with MRI technology Active shimming – 1
ppm local uniformity High field (~ 7 T) with
large gap (~ 40 cm) is possible
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Muon magnetic momentMuon magnetic momentMagnetic moment and spin can be related as
Dirac equation predicts g=2
Radiative corrections (including NEW PHYSICS) would make g≠2
€
rμ=ge
2m
⎛
⎝ ⎜
⎞
⎠ ⎟r s
€
rμ: magnetic moment
€
rs : spin
€
g : gyromagnetic ratio
€
a =g − 2
2
€
μ =(1+ a)eh
2m
⎛
⎝ ⎜
⎞
⎠ ⎟
a=0
a≠0
a=1.2e-3 for e, μ, …a=1.8 for proton
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SM Contribution to SM Contribution to Any particle which couples to muon/photon
would contribute : QED >> Hadron > Weak
a≠0
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Current PrecisionCurrent Precision
E821 at BNL-AGS measured down to 0.7 ppm for both μ+ and μ
3.4 sigma deviation from the SM
Need to explore further
€
Δaμ( today) = aμ
(Exp) − aμ(SM) = (295 ± 88) ×10−11
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Muon g-2 in the LHC eraMuon g-2 in the LHC eraEven the first
SUSY discovery was made at LHC, the muon g-2 measurement remains unique to determine SUSY parameters:
μ and tan
€
aμ (SUSY) ≈ (sgnμ)13×10−10 tanβ100 GeV
˜ m
⎛
⎝ ⎜
⎞
⎠ ⎟2
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Shipping to J-PARCShipping to J-PARC
Estimated to be $2.5M
Need to be refined
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Muon Facility at MLFMuon Facility at MLFOnly One port out of four ports are
instrumentedMuon team welcomes new initiative!
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J-PARCPlan for FY 2007-8 07.6 ceiling shield 07.9 solenoid install 07.12 radiation safety 08.3-9 proton beam Project budget ( 2005−8 )Special budget for PS-experimental. ( 2005−8 )Phase II budget (2008-2011)
107/s
20051) Building construction2) M2 tunnel BL component manufacture
20061) M2 tunnel BL component install2) Air Cooling system 、 Electricity
20071) M2 tunnel BL commissioning2) SCS channel install
20081) Exp apparatus for general user2) Surface muon channel (tunnel-B3)3) Front magnet for slow muon
2008/9 muon beam Decay/Surface MuonPor
μ+,μ- / 107/s 4MeV-40MeV
Phase IIa
Phase IIa
Super Omega muon channel
High MomentumDecay Muon Port ? (In future)
From Miyake-sanFrom Miyake-san
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Intense Ultra Slow Muon Source @Intense Ultra Slow Muon Source @J-PARCJ-PARCAt J-PARC, Aiming at;
1) Repetition Rate 25 Hz (At RIKEN-RAL 50 Hz) factor 2 times
2) Surface Muon Yield by Super Omega Channel
4.0 x 108 /s / 1.2 x 106 /s (RIKEN-RAL) = 333 times
3) Lyman-Intensity by Laser Development
100 μJ/p / 1 μJ/p (RIKEN-RAL) = 100 timesOur Goal of Ultra Slow Muon Yield is
20 /s x 2 x 333 x 100 = 1.3 x 106/s (104/s without Laser Developments)
Riken-RAL Slow Muon Intensity
Maximum J-PARC Slow Muon Intensity
From Miyake-sanFrom Miyake-san
Iwasaki, Wada, Midorikawa et al. at RIKENIwasaki, Wada, Midorikawa et al. at RIKEN
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Re-AccelerationRe-Acceleration
Consulted Takayama-san, Yokoya-san, Sato-sanTakayama-san is exploring the possibilityAnd also suggested to explore LINAC
option
LINAC SystemsDon Swenson et al. 10 MeV Proton Linac < $3M
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Muon Trio (named by Kuno-san)Muon Trio (named by Kuno-san)
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Aoki-san’s Slide@ NuFact ‘03
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Muon EDMMuon EDM
Direct CPV in Lepton Sector
Current Exp. Limit ~ 1e-19
Potential Sensitivity of J-PARC~ 1e-22 @ MLF ~ 1e-24 w/ PRISM
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RSC-MLF vs MR-Hadron HallRSC-MLF vs MR-Hadron HallMLF HD-Hall HD w/ new TGT
Beam Power 1MW 0.75MW 0.75MW
Target 6% 30% 30%
60 kW 225kW 225kW
Acceptance 150 msr 1msr 400 msr
Relative to MLF 1 1/40 10
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Optimization of muon mom. Optimization of muon mom.
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Mev/c
Mev/c
Mev/c
Mev/c
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Muon Beam available at J-PARC Muon
Surface Muon Port
Super Omega Muon Port
Decay/Surface Muon Port
3000 times as KEK-MSL30 times as RIKEN-RAL
From Miyake-sanFrom Miyake-san
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Current result is 3.4 sigma above from the SM value If LHC discovers SUSY, tan can
be determined to Δtan ≤ 20% LOI submitted in 2003 to improve
the precision (AGS) by up to one order of magnitude at J-PARC
Efforts toward a proposal have started to realize the experiment in the earlier phase of J-PARC Technical feasibility of bunch
sequences and beamline are being explored
Harmonics changes in the MR and kicker design are key issues
KEK designed new inflector for a better muon injection efficiency
g-2 ring to be shipped from BNL
Muon g-2@J-PARCL. Roberts, D. Hertzog, Y. Kuno and N. Saito, et al
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Muon Spin precessionMuon Spin precession
€
rωa = −e
maμ
r B − aμ −
1
γ 2 −1
⎛
⎝ ⎜
⎞
⎠ ⎟
r β ×
r E
c+
η
2
r β ×
r B +
r E
c
⎛
⎝ ⎜
⎞
⎠ ⎟
⎡
⎣ ⎢
⎤
⎦ ⎥
€
magic = 29.3
€
pmagic = 3.09 GeV/c
€
η : dμ =η
2
e
2m
⎛
⎝ ⎜
⎞
⎠ ⎟ Electric Dipole Moment
€
de = (6.9 ± 7.4) ×10−28e ⋅cm
€
dμ < (1.5 ±1.4) ×10−25e ⋅cm
€
dμ = (3.7 ± 3.4) ×10−19e ⋅cmMeasured to be
Expected to be
€
aμ −1
γ 2 −1= 0
€
rωa = −e
maμ
r B
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How it is Measured?How it is Measured?Precession frequency (ωa) of muon spin
in the storage ring is measured;
€
ωa = −e
maμ B
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Brain-storming!Brain-storming!Why at magic gamma?
What if no E-field?⇒requires ultra cooled muon beam Δp/p << 1e-5
Muon collider technique? Cooling, FFAG etc.
Ultra-Slow Muon Source at J-PARC MLF?
35
€
rωa = −e
maμ
r B − aμ −
1
γ 2 −1
⎛
⎝ ⎜
⎞
⎠ ⎟
r β ×
r E
c+
η
2
r β ×
r B +
r E
c
⎛
⎝ ⎜
⎞
⎠ ⎟
⎡
⎣ ⎢
⎤
⎦ ⎥
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Ultra-Slow Muon SourceUltra-Slow Muon SourceK.Nagamine et al. PRL 74 (1995) 4811K.Nagamine et al. PRL 74 (1995) 4811Y.Matsuda et al. NP B(Proc) 155 (2006) 346Y.Matsuda et al. NP B(Proc) 155 (2006) 346
Laser Ionization of Muonium
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Super-Omega Muon BeamlineSuper-Omega Muon Beamlinefor Intense Ultra Slow Muon Beamfor Intense Ultra Slow Muon Beam
Normal Conducting(MIC)
Capture Solenoids
Superconducting Curved
Transport Solenoids,
~ 400mSr (0.3T)
Curved Solenoid
( 1.4T)
Phase 2
From Miyake-sanFrom Miyake-san
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As of 5 years agoAs of 5 years ago