Upload
casey-guy
View
25
Download
1
Tags:
Embed Size (px)
DESCRIPTION
HD Project and Future. 29 July 2005 M. Fujwawa@rcnp. Physics ? What we can have as a strategic device ? New projects: Polarized proton and deuteron target: “HD project”. Collaboration with H. Kohri, M. Tanaka, N. Muramatsu, T. Hotta, M. Yosoi, - PowerPoint PPT Presentation
Citation preview
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