Hiromi Iinuma (KEK) for Hiromi Iinuma (KEK) for New g-2/EDM@J-PARC New g-2/EDM@J-PARC

collaboration collaboration

1.1. Motivation and goalMotivation and goal

2.2. Outline of new experiment Outline of new experiment

3.3. SummarySummary

NEW APPROACH TO THE MUON gNEW APPROACH TO THE MUON g2 2 AND EDM EXPERIMENT AT J-PARCAND EDM EXPERIMENT AT J-PARC

2

Motivation for Muon g-2 and EDMMotivation for Muon g-2 and EDM

Latest experimental result ：

PRD73, 072003 (2006)

WeakQCDQEDSM aaaa Standard model

http://pdg.lbl.gov/2009/reviews/rpp2009-rev-g-2-muon-anom-mag-moment.pdf

2.3104963255a 11SM-Exp

Recent theoretical work HLMNT10(preliminary) 3.2 (Tau2010)

2010/9/28

ppm54.0a

a exp

ppm1.0

+ + ++ + + +

Electric Dipole Moment

Scaling from electron EDM EDM~1025 e.cm A recent theoretical work EDM = 1022~ 1024 e.cm ?G. Hiller et al. hep-ph/1008.5091v1 (2010, Aug.)

EDM upper limit:1.8 1019 e.cm (95% C.L.)PRD 80, 052008 (2009)

Go beyond at least order of magnitude!

How to measure a =(g2)/2 and EDM?

B2

2g

m

ecsa

Measure the muon precession frequency in the uniform magnetic field B

2010/9/283

Bam

ea

B

B

a

a

a

a

< 0.1 ppm < 0.1 ppm

“Non-zero EDM case”

Measure two frequency vectors separately!!

BEDMc2

Bam

eEDMa

csa

B

S

Magic momentum + beam cancels focusing electric field term

B=1.45 TeslaB=1.45 Tesla 、、 diameter 14mdiameter 14m 、、 45m 45m roundround12 magnet yoke pieces12 magnet yoke pieces

4

c

EBEDM

c2

c

Ea

1

1Ba

m

q2Sca

EDM=03.29magic

Great E821 and beyond the horizon

e+

2/a=4.4sec150 (g-2) Cycles in Positron Time Spectrum! 　

PRD73, 072003 (2006)

EEe+e+ > 1.8 GeV > 1.8 GeV calorimetrycalorimetry

ppm .syst28.0.stat46.0ppm54.0a

a

ppm21.0 ,ppm17.0B

B

a

a

2010/9/28

• More muons! Statistics uncertainty < 0.1 ppm (0.46ppm)• For the better B/B <0.1ppm ( 0.17ppm);• Compact storage ring to reduce the field volume

• For the better a/a <0.1 ppm ( 0.21ppm);• Ultra-cold muon beam, even “off-magic” momentum • High granularity detector • Measure two frequency vectors separately for g2 and

EDM measurements Independent experimental approach provides independent

      systematic studies for even clearer physics understanding!!

High Intensity Muon Beam in JAPAN!

5

J-PARC

Tokyo

KEK

2010/9/28

Bird’s eye photo in Feb. 2008

P, 30GeV

-beam

P, 3GeV

Thursday 10:00 Prof. N. Saito

6

Graphite target (20 mm)

3 GeV proton beam ( 333 uA)

Surface muon beam (28 MeV/c, 4x108/s)

Muonium Production (300 K ~ 25 meV 2.3 keV/c)⇒

2010/9/28

Proton beam(3 GeV, 1MW, 25 Hz)

Muon Linac (300 MeV/c)

(28 MeV/c)

Step1: Ultra-Cold + Source and LINACLaser

(2.3 keV/c)

Graphite target (20 mm)

3 GeV proton beam ( 333 uA)

Surface muon beam (28 MeV/c, 4x108/s)

Muonium Production (300 K ~ 25 meV 2.3 keV/c)⇒

Super Precision Magnetic Field(3T, ~1ppm local precision)

2010/9/28

0.66 m diameter

+ beam

=3 and B=3 [T]

Step2: Injection & storage

Step3: Detect decay e+

(note: 14 m for E821)7

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Expected precession signal from J-PARC within a Snowmass year beam time !

Ee> 200MeV

Default 50% pol.Study for high pol. Is ongoing.

2010/9/28

Example EDM wiggle, if EDM=210-20 e.cm

example

9

Expected sensitivity for EDM would be better than 210-20 e.cm

BEDM

R&D items are running!

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Step2: Injection & storage

Step3: Detect decay e+

Step1: Ultra-cold + source and LINAC• Test experiments to search the best

Mu production target are ongoing at TRIUMF and RAL !

• Hi Power Ly- Laser System R&D

• LINAC R&D

• Setup spin dependent muon-decay including EDM term in GEANT4

• Positron detector design• Hi-rate Si Tracker• Belle sensor with SiLC

based FEE

• See next few pages

3D-spiral injection

RB

+

F

2010/9/2811

Back to Step2: Injection & storageBack to Step2: Injection & storageTechnical difficulties:3T is too high to cancel fringe field by inflector,Required kick angle (~60 mrad) is too big.

Concept is simple but real design ?

Storage ring magnet (ver.0 design)

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Cylindrical return yoke (Iron)

Upper end cap (Iron)

Pole tip (Iron)

Tunnel for + beam

Upper half

Super conductive Main coils

3T super conductive solenoid magnet Uniformity in the beam storage region<0.1ppm Careful design of fringe field for stable beam injection

1.8m

4.6m

Inner radius 1.6m

1ppm level at storage volume is achieved

Apply MRI technology!

Storage ring magnet (ver.0 design)

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+

1.8m

4.6m + beam orbit diameter 0.66m2.1m round (cyclotron period=7.4 nsec)

1. 3 tesla super conductive solenoid magnet2. Uniformity in the beam storage region<0.1ppm3. Careful design of fringe field for stable beam injection

Upper half

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Beam acceptance study is ongoing

Start

+

y<0Solenoid axis

y>0

y>0y<0

y

Beam acceptance

Coil

Vertical kicker (ver.0)

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Helmholtz typeBr(t)=Bpeak sin(t)

Apply radial magnetic field to reduce beam vertical momentum

Prototype kicker is being designed for test.

±10cmSTOP!

SummaryA new muon g2 and EDM experiment at JPARC:Off-magic momentumUltra-cold muon beam + compact g-2 ring Independent experimental approach provides independent

systematic uncertainty Complementary to New g2@FNALSaturday 10:00 Prof. B. Lee Robertshttp://gm2.fnal.gov/public_docs/proposals/Proposal_g-2-3.0Feb2009.pdf

Active R&D efforts are ongoing!

My next step: Verification test for injection + kicker system

16 2010/9/28

J-PARC g-2/EDM collaboration 71 members (…still evolving) M. Aoki, P. Bakule, B. Bassalleck, G. Beer, A. Deshpande, S.

Eidelman, D. E. Fields, M. Finger, M. Finger Jr., Y. Fujirawa, S. Hirota, H. Iinuma, M. Ikegami, K. Ishida, M. Iwasaki, T. Kakurai, T. Kamitani, Y. Kamiya, N. Kawamura, S. Komamiya, K. Koseki, Y. Kuno, O. Luchev, G. Marshall, M. Masuzawa, Y. Matsuda, T. Matsuzaki, T. Mibe, K. Midorikawa, S. Mihara, Y.Miyake, J. Murata, W.M. Morse, R. Muto, K. Nagamine, T. Naito, H. Nakayama, M. Naruki, H. Nishiguchi, M. Nio, D. Nomura, H. Noumi, T. Ogawa, T. Ogitsu, K. Ohishi, K. Oide, A. Olin, N. Saito, N.F. Saito, Y. Sakemi, K. Sasaki, O. Sasaki, A. Sato, Y. Semeritzidis, K. Shimomura, B. Shwartz, P. Strasser, R. Sugahara, K. Tanaka, N. Terunuma, D. Tomono, T.Toshito, K. Ueno, V. Vrba, S. Wada, A. Yamamoto, K. Yokoya, K. Yokoyama, Ma. Yoshida, M. H. Yoshida, and K. Yoshimura

18 Institutions Academy of Science, BNL, BINP, UC Riverside, Charles U., KEK,

NIRS, UNM, Osaka U., RCNP, STFC RAL, RIKEN, Rikkyo U., SUNYSB, CRC Tohoku, U. Tokyo, TRIUMF, U. Victoria

6 countries Czech, USA, Russia, Japan, UK, Canada

17

Thank you!

2010/9/28

Backups

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Requirements for Kicker

19

Br(t)=Bpeak sin(t)=/TkickField strength ：

Bpeak = 1Gauss ~ 10 GaussTime distribution ：

Tkick=150 nsec (c.f. 20 cyclotron periods)Spatial distribution ：

33cm±5mm in radial direction, 1% uniformity±10cm in solenoid axis direction to reduce distortion o f beam bunch shape

Minimal effect for positron detector ：1. Quench protection2. Space problem3. Eddy currents on cryostat wall

e+ detector(Silicon tracker) 2010/9/28