J-PARC, facility for hadron physics, the present status and future
description
Transcript of J-PARC, facility for hadron physics, the present status and future
J-PARC, facility for hadron physics,
the present status and futureT.Takahashi
KEK/J-PARC Center
Contents Brief Introduction of J-PARC Hadron Facility
Results of Commissioning and Physics Programs at each beamline
• K1.8/K1.8BR/K1.1BR Beamlines to be constructed in future
• High-p/K1.1 Summary
J-PARC at Tokai Village
MLF
RCS
LIN
AC
50GeV-PS (MR)
n
HdBird’s eye photo in Feb. 2008
High-power & multi-purpose accelerator
IPNS
1000
10000
100
10
1
0.01
0.1
0.1 1 10 100 1000 10000Energy (GeV)
AGS
CERN-PSFNAL-MI
U70
SPS
ISISTRIUMF
PSI(CW)
KEK-12GeV PS
Tevatron
This Project3 GeV
ExistingUnderconstruction
Power
KEK-500MeVBoosterCu
rren
t (m
A)
SNS
Proposed
Materials-LifeSciences
1 MW
0.1 MW
ESS
Nuclear-ParticlePhysicsThis Project50 GeV
J-PARC =1MW-class high-poweraccelerators
10-times beam power ofany existing accelerators
Pions (p)
Kaons (K)
Anti-proton ( p)
Neutron (n)
High-power & multi-purpose accelerator
proton(p)Target nucleus
neutron(n)
Muon (m)
Neutrino(n)
Particle & Nuclear Physics @ 50(30) GeVMaterials & Life Science @3GeVNuclear Transmutation @600MeV
Proton beam (p)3GeV/50(30)GeV
Hadron Experimental HallPhoto was taken in Oct. 2008
Hadron Experimental Hall
Hadron FacilityHadron Hall
Switch Yard (SY) Tunnel
Beam Dump
MR Tunnnel
Production Target (T1)
Primary Beam LineSlow extraction point
Main Ring (MR)
SY (~ 250m)
Hadron Hall (56m)
MR
Main Ring
to Hadron Hall
60m
Nuclear & Hadron Physics at Hadron Hall
L,X
multi-strangenesshypernuclei
L6LHe
double-L
K− Meson
X-rayNucleus
kaonic atom
kaonic nuclei
f
d
uu
d
s
Pentaquark Q+
Hypernuclear Physics Exotic Hadrons
Origin of Hadron Mass
g-ray spectroscopy
K N Interaction
K1.8
K1.8BRKL
K1.1
K1.1BR
High-P
Beam lines in Hadron Hall
K1.8BRK1.8
KLK1.1BR
• pmax = 1.1 GeV/c• IK~106 ppp @ 1 GeV/c • pmax = 2.0 GeV/c
• IK~106 ppp @ 1.8GeV/c• Double stages Electrostatic Separators• K-/(p-+m-) [email protected]/c
• pmax = 0.8 GeV/c• IK~106 ppp @ 0.8GeV/c
as Kaon Factory (2x1014 ppp, 30GeV-9mA)
• pmean ~2 GeV/c• IKL = 1.8x107 ppp• pencil-beam of 7.8msr
Ni Target
KL->p0 n nbar
rare-decay exp.
K1.8 & SKS
SKS
K1.8 Beam Spectrometer
K1.8 beam line• Pmax=2.0 GeV/c• 46m Length• double stage of Electrostatic Separators
75kV/cm,6m x 2• High-resolution beam spectrometer (K1.8BS)
Dp/p =3.3x10-4 (FWHM)
ESS#1 ESS#2
ESS#1
BS(QQDQQ)
2.0x1014 ppp, Ni Target @1.8GeV/cK- Intensity: 1.4x106
K-/(p-+m-)=3.5DIFV =4.0mmDMS1=4.5mmDMS2=4.8mm
design value
Kaon Yield at K1.8 w/o fine tune
ESS1 ONESS2 ON
[email protected]/c 2009 Nov.26
Separators ±200kVIFH ±100mmIFV 0/+4mmMom ± 60mmMS1 ± 2.35mmMS2 ± 2.5mm
← 1/3 of full
ESS1 OFFESS2 OFF
6.2x1011 ppp (500W) Ni Target
3.6k/spill
Separators ±200kV (±375kV) IFV opening 2.0 mm (4.0mm)MS1 opening 4.7mm (4.5mm) MS2 opening 5.0mm (4.8mm)
2010 Oct.22
1.25x1012 ppp (1kW) Pt Target
p-
K-
K-trigger
pbar
All charged particles
K-trigger
12k/spill
Trouble1/6 of coil was lostdue to earth fault
Beam & SKS Spectrometer- Performance -
SKS from Tsukuba to Tokai for High-resolution Spectroscopy of Hypernuclei, etc..
• Large solid angle of 100msr• High resolution of Dp/p ~ 0.1%(FWHM)
300W refrigerator for Liq-HeSmall refrigerator system• GM-JT refrigerator x 3• GM cryocooler for GM-JT shield• GM cryocooler for HiTC current leads2.7T@ 400A
Measured field map
2.45T@400ACalcurated field map
at 1.25GeV/c
Approved Experiments at K1.8 Exotic Hadron/Hadron system
E19 Q+ Search via the H(p-,K-)X E27 Kaonic nuleus via the D(p+,K+)”ppK-”
Hypernuclei of S=-1 E10 n-rich L hypernuclei via the (p-,K+) reaction ( 6
LH, 9LHe)
E13 g-ray spectroscopy (4LHe, 7
LLi, 10LB , 11
LB, 19LF )
E18/E22 weak decays (4LH/4
LHe, 12LC )
Hypernuclei of S=-2 E05 X-hypernucleus, via the 12C(K-,K+)12
XBe E07 Counter-emulsion hybrid experiment E03 Measurement of X-Atom X-rays (X-Fe Atom)
Others E08 Pion double charge exchange E26 w in nuclei by A(p-,n) reaction and w->p0g
E19: Search for penta-quark, Q+,via the p+p- → K-X reaction
The First PHYSICS EXPERIMENT at Hadron Hall. uーs u
d
d
To confirm the bump-sructure observedin the previous E522 experimentwith much improved• resolution better than 2MeV/c2
• S/N using Liq-H2 target• statistics with high-intensity beam
7.8x1010 p- on 12cm-long Liq-H2 at 1.92GeV/c
Step-1 data taking was successfully finished in this autumn.
M.Naruki on Dec.10
E522CH2(p-,K-)
1.3 1.4 1.5 1.6 1.7 GeV/c2
Hypernuclear Physics
N
Z L, S Hypernuclei
LL, X Hypernuclei
Stra
ngen
ess
0
-1
-2
N-N int. by Lattice QCD
Baryon-Baryon interaction through the hypernuclear structure XN and LL interaction LN interaction in n-rich enviroment
Hadron property in nuclear medium g-factor of L by B(M1) measurement
Change of nuclear property by additon of hyperon(s) change of nuclear size etc..
K1.8BR
CDS detector
3He target
K1.8BR beamline• Pmax=1.1 GeV/c• 31.3m Length• Electrostatic Separator (50kV/cm,6m)
2.0x1014 ppp, Ni targetK- intensity 7.5x105 @ 1.1GeV/c 1.0x105 @ 0.8GeV/c 8.4x103 @ 0.6GeV/c
Slit Ni Pt K/p (Pt)DIFV=4mm, DMS1=4.7mm 331 678 3.3%DIFV=4mm, DMS1=9.2mm 601 1116 2.1%
[email protected]/c Yield (Measured ) 1.5x1012 ppp, 40kV/cm
(design)
Approved Experiments at K1.8BR
Kaonic nuclei, Kbar-N interactionE17 Measurement of Kaonic 3He 3d -> 2p X-raysE15 Kaon deeply bound state, “ppK-”
via the 3He(K-,n)X and X -> (Lp) -> ppp-
P28 ( 3He(K-,p/n)X )E31 Hyperon resonance below KN threshold via
the D(K-,n) reaction
E17:Strong-interaction Shift and Width of Kaonic Helium 3
Last orbit of Kaonic atoms is sensitive to K--nucleus strong-interaction.
Nucleus
absorption
(Strong-interaction) 2p
3d
(Coulomb-only) 2p
DE2p: Shift G2p: Width
Atomic orbits of Kaonic Helium 3
3d 2p X-rays
EMppp EEE 2
exp22 -D
Slide by Dr. M. Iio
T.Hashimoto on Dec.10
+K- 3He
NC
15 m
+K-pp n
Reaction
Missing mass spectroscopy
K-pp search withTOF measurement of neutron
L
p pp-
Decay
Decay particle measurement
K-pp search with exclusive decay particle measurement
K-pp state is investigated in K-+3He -> Lp + nwell distinguished final state.L is always attributed to K- in the initial state.
E15: Next to E17M. iio, Slide for PANIC08
Y.Sada on Dec.10
K1.1BR
Actual layout of K1.1BR
T1D1
Q1 Q2D2 Q3 Q4 ESS Q5 Q6
MS
D3
Q7 Q8IFX IFY
SX1 SX2
HFOC
• FFProton beam
Shorter length (2.0 m) of ESS instead of optics design (2.5 m) - old K5 ESS is reused - Smaller D3 bending angle (40°) than beam optics (45°) - performance limit of the recycled D3 magnet - Longer Q8-FF distance (3.3 m) than the beam optics (1.5 m) - a thick iron wall necessary for radiation safety -
Beam envelop (K1.1BR)
W = 3.3 msr %dp/p @ HFOC = ± 6 mm; IK+ = 5.4 x 104 /s @5kW W = 5.0 msr %dp/p @ HFOC = ±20 mm; IK+ = 8.2 x 104 /s @5kW (with Pt target)
@ 1.0 GeV/c
L = 21.5 m
ESSBeamAnalyzer
D3 Q7 Q8
Measured K+ Yield & Separation @ 0.8GeV/c
• 4.5x1012 ppp (3.6kW)• Normal Vertical Slit Opening Narrow H.S.Wide H.S. @250 kV @300 kV
Narrow 1,253 3,629 1.4DIFY=+/ - 0.5mmDMS=+/ - 0.75mm
Standard 2,541 ≥58,443 9.8 1.1DIFY=+/ - 1.5mmDMS=+/ - 2.0mm
Wide 3,493 ≥80,338 25.2DIFY=+/ - 2.0mmDMS=+/ - 2.5mm
Widest 3,811 ≥87,653 26.8 6DIFY=+/ - 2.5mmDMS=+/ - 2.5mm
K+/ spill @ 3.6 kWVertical slits pi / K ratio
Test beamline for test exp. (for a while)TREK (Time-reversal Exp.) (future)
Other (Approved) Experiments Meson in nuclei, In-medium modification of mesons
E16 Chiral symmetry of QCD (f in nuclei)@ High-P beamline
E29 f-meson bound state via the A(pbar,f)X@ K1.1 beamline
(deferred status) P04 High-mass dimuon production
@ Primary (High-P) beamline
Beam lines in Hadron Hall
K1.8
K1.8BRKL
K1.1
K1.1BR
High-P
E16: In-medium mass modification of vector meson
R.Muto et al,PRL98(07)042501
KEK-E325 electron-pair spectrometer
• collect 104 ~105 f ee for each target• 10~100 times as large as the previous E325 data• velocity dependence• target (size) dependence
f (1020)
Location of E16 : High-p beam line
SM1: branched by 5° 2% beam loss is allowed
3.9° 5.8°x3
beam dump
Experimental Area
Vertical Bend
Beam dump and shields are for 1010 protons/s
Already the spectrometer magnet has been moved to Hadron Hall.
Budget being requested.
R&D for the actual beam line is underway.
Summary J-PARC has started its operational era! 4 beam lines, K1.8, K1.8BR, KL, and K1.1BR, are
completed. K1.8 & SKS: Hypernuclear Physics Experiments
E19 has finished the step-1 data-taking. K1.8BR: E17/E15 are being started. KL: K rare decay experiment (KL->p0nnbar) started its
engineering run. K1.1BR: Commissioning and some test exp. started.
We are requesting to construct K1.1 and High-p lines
People at J-PARC Hadron Experimental HallGraduate Students, Professors, Researchers, Engineers…, all over
the world2009.1.27 First Beam to Hd Hall2009.10.22 First beam to K1.8KOTO (E15) Experimental Team(K L Rare Decay Search)
Start up of K1.8 Counting Hat
Front end circuits at K1.8BR
New comers and a senior
Line marking at K1.8 area
Our TOF wall is ready!
Midnight in KL Counting Hat
Background survey before construction of
KL!
My beautiful TOF counters!