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-) ~3.5@1.8GeV/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

K+@1.8GeV/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

K-@1.8GeV/c

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%

K-@0.75GeV/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!