HD Project and Future

Physics ?

What we can have as a strategic device ?New projects: Polarized proton and deuteron target: “HD project”

29 July 2005M. Fujwawa@rcnp

Collaboration with H. Kohri, M. Tanaka, N. Muramatsu, T. Hotta, M. Yosoi, J.P. Didelez, G. Roiulle (ORSAY)

TOF

Dipole Magnet　 0.7　 Tesla

LH2 Target

Start Counter DC2 DC3

DC1SVTX

AC(n=1.03)

LEPS spectrometer

ray beam

Missing mass spectrum

• p(,K+) (1116)

72,500 events

• p(,K+)0 (1193)

48,900 events

• 1.5 ~ 2.4 GeV

• 0.6 < coscm < 1

Photon beam asymmetry

Asymmetr

y (2)Photon beam asymmetry

• Vertical = [ 1 + Pcos(2) ]

• Horizontal = [ 1 - Pcos(2) ]

N = Facc

= Pcos(2)

• N : K+ photoproduction yield• : K+ azimuthal angle• P : Polarization of photon• n : Normalization factor for Nv

ddv

ddunpol

ddunpol

ddh

dd

nNv 　 - Nh

nNv 　 + Nh

For all events

Spin observables? Beam asymmetry

Nakayama & Tsushima:

Phys. Lett. B583, 269(2004)

for the positiveparity of the beam asymmetry

is significantly positive,whereas for the negative parity of

beam asymmetry is significantly negative

||

||

B

Physics motivation

Nucleon Spin Sum Rules• Gerasimov-Drell-Hearn (GDH)

• Forward Spin-Polarizability

ss contents in nucleon

+ spin-parity

d

m

0

2/32/122

2

d

03

2/32/120 4

1

pp

KN

) (

pp

SPIN CRISIS !

+ spin-parity determinationZhao and Al-Khalili PLB585(2004)91

KnBeam-target double polarization asymmetry

1/2 + 1/2 -

meson photoproduction @ LEPS of SPring-8

Studying diffractive channels as a tool for non-perturbative QCD (Pomeron structure, search for glueball, f2’-meson trajectories, etc )

Search for exotic processes as ss-knockout

Henley et al. [94]Titov, Yang, Oh [94-98]

Non-polarized observablesare not suitable for this study

ss contents in proton

・　 -meson: ~ ss

pp

pomeron exchange + exchange + ss knock-out

Study small amplitudes by interference double polarization asymmetry

Reconstructed events (K+K- event)

Missing mass (,K+K-)X (GeV)

eve

nts

/2

.5M

eV

Proton(938)

=10 MeV

Invariant mass (K+K-) (GeV)

even

ts /2

.5M

eV

Inva

rian

t mas

s sq

uar

e (

K+K

- ) (G

eV2)

Invariant mass square (K-p) (GeV2)

Selections for event (KK mode) |M(KK)-M |< 10 MeV |MM((,K+K-)X)- Mproton|< 30 MeV

Titov et al. PRC58(1998)2429

beam-target double spin asymmetry forp p

Polarization observables with linearly polarized photon ( in meson rest frame)

Decay Plane // natural parity exchange (-1)J (Pomeron, Glueball, scalars`)

Decay Plane unnatural parity exchange -(-1)J

(Pseudoscalar mesons )

K+

K-

K+

K+ K-

Decay direction //

to direction of beam Spin-flip processes in

Pomeron and f2’…

ss-quark content of proton and neutron

|p=|uud + |uudss

This simple picture depicts pairs of strange quarks as they pop into and out of existence alongside the permanent quark residents of the proton. Nuclear physicists have found that strange quarks, though present for just tiny fractions of a second at a time, also contribute to the proton's properties. Image: JLab

SPIN CRISIS at least 10% ss content in nucleon

G0 experiment at JLAB: Anapole moment

Z0

e

e

Double polarization asymmetry

meson: pure ss-

Beam-target asymmetry and exotic processes with unnatural parity exchange ( -knockout)ss

LEPSSpring-8

CBT=(p - BG) – (A - BG)

(p - BG) + (A - BG) =p – A

p + A - 2BG

BGR=p + A)/2

CBT

CBT

( )2

={1-CBT(1-R)}+CBTR2 2 2 2

2CBT(1-R)2 2

p

p

( )2

+R2

(1-R)2

BG

BG

( )2

Error estimation for CBT measurement

Polarization in thermal equilibrium

BIgBH zN(B)

| -1/2>

|+1/2>

E=gNB

)2k

tanh(2k

Δ

2k

Δ

2k

Δ

2k

Δ

T

E

ee

ee

NN

NNP

T

E

T

E

T

E

T

E

If I=1/2,

proton : gpNB/2kT=0.00101 B(T)/T(K)electron: geBB/2kT=0.67 B(T)/T(K)

Principle of HD

• Longstanding effort at Syracuse, LEGS/BNL ORSAY

• 10-20 mK• 15-17T• 80% for H, 20% for

D (vector)• 20%70% in D

with DNP

Thanks toH. Toki forthe RCNP-ORSAYcollaboration

HD distillator

RCNP In 2006

Present status

• LEGS/BNL (Syracuse)

　　　　　　　　　　 Future

• RCNP ( Spring-8)

goal: 10m K, 17 T

LEGS@BNL

Polarized HD NMR Coils

Solenoid Coil

Saddle coils

Liquid 3He (0.5 K)

Liquid 4He (4.2 K)

70 K Shield

Al Wires

HYDILE target @Orsay

偏極陽子・重陽子標的装置

RCNP低温施設

• 施設整備

• 電力ライン

• 冷却システム

1220

mm

170mm

70m

m

Mixing Chamber

Nb3Sn joints&Protection Circuit

NbTi joints&Switch

Main Coil

Correction Coil

Null Coil

Rough dimensions of the magnet

400mm

600m

m

550m

m

1K Pot

538m

m

Field profile aroundMagnet Center

16.990

16.992

16.994

16.996

16.998

17.000

17.002

17.004

17.006

17.008

17.010

- 100 - 80 - 60 - 40 - 20 0 20 40 60 80 100

0

5

10

15

z (mm)

B (T)R(mm)

150mm

500ppm

0.00

0.02

0.04

0.06

0.08

0.10

0.12

0.14

0.16

0.18

0.20

400 500 600 700 800 900 1000 1100 1200

0

10

20

30

40

50

60

70

80

z (mm)

B (T)R(mm)

Field profile around Mixing Chamber

Field profile around Mixing Chamber

0 30 60 90 120

150

180 400

42044046048050052054056058060062064066068070072074076078080082084086088090092094096098010001020104010601080110011201140116011801200

0.04500-0.05000

0.04000-0.04500

0.03500-0.04000

0.03000-0.03500

0.02500-0.03000

0.02000-0.02500

0.01500-0.02000

0.01000-0.01500

0.00500-0.01000

0.00000-0.00500

R(mm)

70m

m

Mixing Chamber

170mm

1K Pot

538m

m

0

200

400

600

800

1000

1200

1400

1600

1800

2000

2200

2400

2600

2800

3000

3200

3400

3600

3800

4000

0

200

400

600

800

1000

1200

1400

1600

1800

2000

2200

2400

2600

2800

3000

3200

3400

3600

3800

4000

4200

4400

4600

4800

5000

0.0095- 0.010.009- 0.00950.0085- 0.0090.008- 0.00850.0075- 0.0080.007- 0.00750.0065- 0.0070.006- 0.00650.0055- 0.0060.005- 0.00550.0045- 0.0050.004- 0.00450.0035- 0.0040.003- 0.00350.0025- 0.0030.002- 0.00250.0015- 0.0020.001- 0.00150.0005- 0.0010- 0.0005

R(mm)

Z(mm)

B(T)

Stray Field profile around Magnet

Road map (5 years from 2005 fiscal year) for Studies of Hardron structures

2008200720062005

（DR＋ SC magnet）

2009 After 2010Fiscal year

Spin and parity determination of + particle

HD gas、 IBC、TRC、others

TRC

NMR

DR+IBC

SRC

New DR

Scintillator ball 、 TPC

Scintillator ballInstallation of new detectors

Roma2, ORSAY

HD at Spring-8 、 meson production, K-production, hidden strangness of nucleon

New TPC

design

HD polarization

Charged meson productionExperiments with magnetic spectrometer

Polarized HD SPring-8

Collaboration with Roma2、 ORSAY、 US

Neutral particle detection withScintillator ball

total 92,507 kyen 103,000 103,000 93,000 93,000

New badget 83,505 96,000 96,000 86,000 86,000

totalAbout 480,000 kyen

IBC cryostat and newData taking system

Summary CBT measurements with polarized target HD at SPring-8

p 0 + p

+ p K + , K+

+ p + p

JAPAN-KOREA-CHINA Three country conference in February 2006“Hadron and Nuclear Physics with Photons” supported by RCNP and APRC