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

collaboration

1. Motivation and goal2. Outline of new experiment 3. Summary

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

2

Motivation 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 Tesla 、 diameter 14m 、 45m round12 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)

Ee+ 　 > 1.8 GeV calorimetry

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

J-PARC Facility(KEK/JAEA)

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)⇒Surface muon

Ultra Cold m+ Source

Muon LINAC (300 MeV/c)

Muon

storage

2010/9/28

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

Muon Linac (300 MeV/c)

(28 MeV/c)

New Muon g-2/EDM Experiment at J-PARC with Ultra-Cold Muon Beam

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)⇒Surface muon

Ultra Cold m+ Source

Muon LINAC (300 MeV/c)

Muon

storage

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+

New Muon g-2/EDM Experiment at J-PARC with Ultra-Cold Muon Beam

(note: 14 m for E821)7

2010/9/288

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!

2010/9/2810

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

GEANT4

• 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 & 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)

2010/9/2812

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)

2010/9/2813

+

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

2010/9/2814

Beam acceptance study is ongoing

Start

+

y<0Solenoid axis

y>0

y>0y<0

y

Beam acceptance

Coil

Vertical kicker (ver.0)

2010/9/2815

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@FNAL

Saturday 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, Canada17

Thank you!

2010/9/28

Backups

2010/9/2818

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

20 2010/9/28

Kicker circuit and eddy current study

Start DAQ

R=60cm cryostat wall

2010/9/2821

Br0

5%20%

2 deg.

0.8 deg.

Small angle orbit requires “smooth” Br distribution Smooth Br provides easy requirements for beam and kicker

Smaller angle orbit gets bigger integral

field effectNeed to decrease

510-4 Tesla

Injection orbit stability: Shallow vs. deep angle orbit

“good field region” weak magnetic focus 　 ?

2010/9/2822

yR

BnB ,

R

rn1BB

r

B

B

Rn

y0Ry0y

y

y0

1mmr , ppm1.0B

B

y0

y

Focus condition 　 0<n<1n<1: for radial direction

n>0 :solenoid axis direction

We have n=3E-5

• 3D field measurement is needed…

If we require:

Field inside beam tunnel

2010/9/2823

Inside tunnel

Gauss

Cross section1

Cross section2

Cross section3

Absolute field strength along the tunnel

Cross-section1

Outside

2010/9/2824

10cm

Field vectors

Cross section1 Cross section2 8cm

Cross section3 50cm

We are trying square and circle shapes

Field measurement =NMR frequency measurement

Measure and well better than

0.1ppm

Muonium hyper splitting experiment to improve (ongoing at J-PARC)

2010/9/2825

26

K. Hagiwara et al., PLB 649 (2007) 173-179

10-10

11658471.8 0.0

693.2 5.1

15.4 0.2

11659180.4 5.1

Dominant component~99%(ee ~73%)

Dominant uncertainty

aSM = Q

EDQ

CDW

eak

T.Kinoshita, M.Nio

Recent ee experimental data made big contributions (BaBar, KLOE….)

Theoretical calculation

K.Hagiwara D. Nomura

2010/9/28

2010/9/2827

K. Hagiwara et al., PLB 649 (2007) 173-179

.

s34

hadronseesR

sK

,s

sKsRds

3

ma

2

*0tot

s 2

2

LO,had

th

Nambu-Goldstone boson’s exchange

J. Prades, arXiv:0907.2938v1

10HLbL 106.25.10a

0, ,’

is a known function (PRD69 093003), !

M

BNL, FNAL, and J-PARC

28

BNL-E821 Fermilab J-PARC

Muon momentum 3.09 GeV/c 0.3 GeV/c

gamma 29.3 3

Storage field B=1.45 T 3.0 T

Focusing field Electric quad None

# of detected m+ decays 5.0E9 1.8E11 1.5E12

# of detected m- decays 3.6E9 - -

Precision (stat) 0.46 ppm 0.1 ppm 0.1 ppm

2010/9/28

Muon source

29

Requrements:40000 times more muons, andCooler muon than RAL

670 times higher surface muon per spill at J-PARC 2.4 x 104/spill 1600 x 104/spill (25 spill/sec)

100 times intense laser 1mJ 100mJ

Room temperature target (hot tangsten silica aerogel?)2000K (15keV/c) 300K (2.3keV/c)

4x104 ultra-cold muon/spill with p=2.3keV/c2010/9/28

g-2:Stored Energy / Cold MassK. Sasaki, T. Ogitsu, et al.

Not an extreme, but requires serious efforts Material : NbTi /Copper Cu/Sc ratio : 4 Central Field:3T Peak Field on Cable: 5.4 T Nominal current : 417 A Stored Energy : 23 MJ Inductance : 264.5 H Total mass : 3.7 t

Well withincurrent Technology !

30 2010/9/28

g-2 silicon trackerDetector area

0.12 * number of vanes [m2]2.9 m2 for 24 vanes

Number of sensors384 for 24 vanes

Number of channelsAssume 0.2 mm pitch115k for 24 vanes*

– *288k for multi-segments readoutg-2 silicon tracker

576 mm

580

mm

2010/9/2831

32

Silicon strip module

front back

Support

DSSD sensors

Readout chip

2010/9/2832

Silicon sensor

33

Sensor type ： Double-sided SSD Chip size : ~12 cm x 6 cm Thickness: 320 um Readout: AC-couple Depletion voltage : 80 V Detector capacitance : ~100pF* Strip pitch : 200um*

* to be determined by further studies.

From Belle SVD page

p-side n-side

2010/9/28

Spin equation (T-BMT equation + EDM)

Our case: 0EB

34 2010/9/28

yyxx

yz

xz

x

y

ss

s

s

m2

eB

0

s

s

1am

eBs

dt

sd

sm2

eB

dt

dsz