J-PARC, facility for hadron physics, the present status and future
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Transcript of J-PARC, facility for hadron physics, the present status and future
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J-PARC, facility for hadron physics,
the present status and futureT.Takahashi
KEK/J-PARC Center
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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
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J-PARC at Tokai Village
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MLF
RCS
LIN
AC
50GeV-PS (MR)
n
HdBird’s eye photo in Feb. 2008
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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
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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
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Hadron Experimental HallPhoto was taken in Oct. 2008
Hadron Experimental Hall
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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
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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
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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.
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K1.8 & SKS
SKS
K1.8 Beam Spectrometer
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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
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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
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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
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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
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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
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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..
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K1.8BR
CDS detector
3He target
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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)
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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
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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
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+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
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K1.1BR
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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 -
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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
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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)
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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
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Beam lines in Hadron Hall
K1.8
K1.8BRKL
K1.1
K1.1BR
High-P
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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)
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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.
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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
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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!