Spin at J-PARC

Spin at J-PARCSpin at J-PARC

Naohito Saito

for

Shoji Nagamiya

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

Bird’s eye photo in Feb. 2008

Proposals at MRProposals at MR

Zoom in to ProposalsZoom in to ProposalsHyper Nuclear PhysicsHyper Nuclear Physics

Hyper Nuclear PhysicsHyper Nuclear Physics



Spin PhysicsSpin Physics

Time Reversal Spin PhysicsTime Reversal Spin Physics

Neutrino Physics




Exotic SearchExotic Search

K Rare Decay

Drell-YanDrell-Yan

Polarized proton acceleration Polarized proton acceleration at J-PARCat J-PARC

6

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

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

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

8

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 +-

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

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,….

Parking Lot Solution?Parking Lot Solution?

11

60 m

Possible Extension of Hadron HallPossible Extension of Hadron Hall

To G-2 beam line

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

Muon Beam Production Area

backupsbackups

15

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

16

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

SM Contribution to SM Contribution to Any particle which couples to muon/photon

would contribute : QED >> Hadron > Weak

a≠0

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

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

Shipping to J-PARCShipping to J-PARC

Estimated to be $2.5M

Need to be refined

Muon Facility at MLFMuon Facility at MLFOnly One port out of four ports are

instrumentedMuon team welcomes new initiative!

22

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

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


Iwasaki, Wada, Midorikawa et al. at RIKENIwasaki, Wada, Midorikawa et al. at RIKEN

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

25

Muon Trio (named by Kuno-san)Muon Trio (named by Kuno-san)

26

Aoki-san’s Slide@ NuFact ‘03

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

27

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

Optimization of muon mom. Optimization of muon mom.

29

Mev/c

Mev/c

Mev/c

Mev/c

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


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

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

How it is Measured?How it is Measured?Precession frequency (ωa) of muon spin

in the storage ring is measured;

€

ωa = −e

maμ B

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

⎛

⎝ ⎜

⎞

⎠ ⎟

⎡

⎣ ⎢

⎤

⎦ ⎥

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

36

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


38

As of 5 years agoAs of 5 years ago

Documents

Spin at J-PARC