Experimental Facilities
at the J-PARC 50-GeV PS
J. Imazato
J-PARC Nuclear and Particle Physics Group
1.
2.
3.
4.
5.

Nuclear and particle physics facilities
Construction schedule
Shift from the 12-GeV PS
Development of beamline elements
Physics program and secondary lines50-GeV PS facilities
HadronExperimental Hall
Fast extraction

NeutronMuon

Neutrino
Experimental Facility

Slow extraction

Hadron Experimental facility (Phase 1)
A-Line50-GeV PS

NP-HALL
56m(L) 60m(W)Switch Yard

MatchingSection
 180 m long switch yard no test experiment facilityT1 target(30% loss)

2.9m
80m

Beam Dump(750kW)

Slow-extraction beamE(GeV) Harm.# Bunch Period (s)I (µA)P (kW)

Spill(s)D.F.

Elin(MeV)

30*

983.539270> 0.7> 20 %181

30*

18154.08

14.4

432> 0.7> 17 %181

<for comparison>30

983.5315450> 0.7> 20 %

400

40

983.53

15600

0.7

20 %

400

50

983.53157500.7

20 %

400

* The ratio of per bunch intensity between 181 MeV and 400 MeV of 0.6 is assumed.

 Beam energy is limited to 30 GeV due to electricity andcooling water capacities in Phase 1

Experimental Hall (Phase 1)
 Hall size :60m (W) x 56 m (L) Floor level :-6.4 m from ground level Beam height : 2.0 m above floor
 Primary line : A- line (straight line) T1 target : T1 length :rotating Ni disks watercooled
30 % beam loss equiv.

 T1 heat load: 9.3 kW
 Beam dump: Cu blocks
with tapered beam inlet
 Dump power: 750 kW maximum

Phase-2 Hall Hall size = 60m (W) x 100 m (L) More than 2 target stations
 Beam dump will be rolled down
 Test beam facility

Neutrino facility
ン型
サスペンショ x 2)クレーン(20tPQ2A

PH3PC4PQ4PV2PC3PQ3PC1PV1PD2

PD1
1.92 deg. bend

引き出し基準点x=49615028.58, y=69561283.94

PQ1PH2PH1

1.92 deg. bend

13978.6

PQ5

PC26164.5

ニュートリノ・ビームライン

16300

14186.5

8571

5300

33800

2080021x16.5=346.5m2
17000

R107R106

R1R10400

7040

43

15800

034x16=544m2
20800

040
R9 09600

アーク中心x=49650.877m, y=69450.356

Proton line with SC
combined-function magnets

Ｔ１7000

FH1

ロス・ポイント(最大で250W)

179.92FV1 FQ16363.4

20tクレーン2基サブトンネルDEFQ2

アラインメント用穴

サブトンネルDＴ２FQ3
FH27550

FVD1FQ434.0

FVD232.8

ニュートリノ標的

9.725800

19.2

ビーム振り下げ21x12=252m2

3.5

遮蔽扉, 気密扉 (気密は地上開口部で取ってもよい)

アラインメント用穴

11800

21x5.5=115.5m2

Fast-extraction beam

E (GeV)

Harm.# Bunch

Period (s)I(µA)

P (kW)Elin(MeV)

40*

983.53

9360

181

40*

18153.38

17.4700

181<for comparison>
40983.53

15600

400

50

983.5315750400* The ratio of per bunch intensity between 181 MeV and 400 MeV of 0.6 is assumed.

 Beam energy is limited to 40 GeV due to the lack of a flywheel.

Expected Beam PowerEquipment transferred from 12-GeV PS
Item

Quantity

From

To

Bending magnet

18

ν line etc.

hadron SY primary line

Quadrupoles21ν line etc.

hadron SY primary line

Magnet power supply >69

E-, and N-Hall hadron hall and neutrino

Secondary magnets

K6, K5 etc.

27

Iron shielding blocks 5,000 t

K1.8, K1.1 in hadron hallE-, and N-Hall hadron hall, neutrino line

Concrete blocks

12,000 t E-, and N-Hall hadron hall, neutrino line

DC separator

2K5 and K6

K1.1 in hadron hallHorn power supply

1

ν lineν lineTransfer of 12-GeV equipment
Ｈ１６ (2004)
4-6月

7-9月

10-12月Ｈ１７ (2005)
1-3月

4-6月

7-9月

10-12月Ｈ１８ (2006)
1-3月

4-6月

7-9月

10-12月Ｈ１９ (2007)
1-3月

4-6月

7-9月

10-12月H２０ (2008)
1-3月

4-6月

7-9月

10-12月

1/1: Start of installation at SY
Magnet modification+ transfer⇧4/1? : Start of ν-line disassembling
Magnet modification + transfer

ν−line magnet

Other primary magnet

4/1: Transfer and start of isntallation in Hall

Secondary magnet

Magnet modification
PS modification

6/1 : Start of installation

Power supply
ShieldingDisassembling

Transfer(Iron blocks and concrete blocks)

DC separator

Disassembling

SKS spectrometer

RepairSKS He refrigerator

Transfer
Transfer

Experimental area
Manpower

Transfer

Repair and tuning

Transfer

12 GeV PS operation ( difficult time)

J-PARC operation
J-PARC construction

1-3月

R&D in the facility construction group
ItemMethod

T1 target

rotating disks

ν targetA-line beam dumpν hornRad-hard magnet
ν line arc magnet
Beam monitor

JunctionsPower feedthroughR&D• drive mechanism• water cooling characteristics• maintenance processgraphite rod• cooling characteristics• thermal shock• irradiation effects
Cu block• water-cooling characteristics• attachment of cooling channel
Al 3 horn system• welding of Al, etc.
inorganic magnet• MIC conductor with high capacity• water cooling peripherals
combined-function SCM • windings, color, etc.
• cryostatSSEM• prototype
RGBPM• prototype
Loss monitor• prototype
quick disconnect system • water, power, vacuum, crane-hookinorganic bus-bar• insulation, thermal stressTest of T1 target prototype
 Water cooling Rotating Ni disks Remote maintenance

East Hall mock-up5m

Letters of IntentAnnounce of LoI call : July 2002
Thirty LoI’s were submitted by early 2003
– Strangeness nuclear physics : 6– Hadron physics :7– Kaon decay :5– Neutrino oscillation :1– Muon decay :3– Facility :8
NPFC Committee meetings:– March 22, 2003
– June 26-28, 2003
– February 16, 2004

Review by June 2003 meeting– Day-1 experiments ：２＋ test line
– Phase1 experiment ：16

Nuclear/Particle Facility LOI Authors
Total #= 478

EuropeJapanNorth AmericaAsia

 Call for full proposals:
sometime this year Formation of PAC:
sometime next year ?

Possible secondary lines in Phase 1

 Plan made by the beamline working group Presented to 3rd NPFC in Feb.2004

Strangeness nuclear physics

K1.8ライン(K-,K+)

K1.1ライン(K,π)(π,K) etc.

L06: New Generation Spectroscopy of Hadron Many-Body Systems with Strageness S=-2 and -1
L07: Hyperon-Proton Scattering Experiments at the 50-GeV PS
L08: High-Resolution Reaction Spectroscopy of S=-1 Hypernuclei
L09: Neutron-rich Λ hypernuclei by the double-charge exchange reaction
L10: Study of Dense K Nuclear Systems K Nuclear Systems
L21: Precise Measurement of the Nonmesonic Weak Decay of A =4, 5 Λ Hypernuclei

K1.8 and K1.1 lines
LengthMaximum momentum
Acceptance

K- Intensity
50GeV, 15µAp
30GeV, 9µAp

Separation
K−/π−
Momentum resolution
RequestK1.8
45.7 m
2.0 GeV/c
2.9 msr %@MS1=±2mm,MS2=±2mm
13K1.125.8 m1.1 GeV/c
4.4 msr %@MS1= ±1mm,
MS2= ±1mm

106 /spill

12106 /spill

106 /spill2.9106 /spill@ 1.8 GeV/c,

3.1@ 1.8 GeV/c,double stage>> 10.03% in σ
106 - 107 /sec K(LoI-10)@ 1.1 GeV/c,@ 1.1 GeV/c,double stage
1.7
106 - 107 /sec K(LoI-06,10)

Kaon decay physics

K0 ライン（KL beam）
E391a detector

K0.8 ライン（stopped K±)
LoI-04 Study of the Rare Decay K＋→π＋νν with Stopped Kaon Beam at J-PARC
LoI-05 Measurement of the K0L→π 0νν Branching RatioLoI-16 Study the Kaon Decay physics at JHF
LoI-19 Search for Tviolation in K＋ decays
LoI-20 Precise Measurement of the K＋→π0e＋ν (Ke3) Branching Ratio

High momentum beam physics
 Beam stealer or Thin target (2%)
at SM1Primary C-line
High-p beam

LoI-01: Measurements of the spin rotation parameters A and R in the resonance region of πN elastic
scattering
LoI-11: Electron pair spectrometer at the JHF 50 GeV PS to explore the chiral symmetry in QCD
LoI-13: Hadron Spectroscopy at J-PARC
LoI-15: Physics of High Mass Dimuon Production at the 50GeV Proton Synchrotron
LoI-18: Energy Dependence of Intermediate Mass Fragment Angular Distribution
LoI-23: Lefetime Measurement of π＋π−and π±Κ± atoms to test low energy QCD

Transferred spectrometers

SpectrometerExperiments

Proposal (LoI)SKS*

hyper-nuclear spectroscopy

L06, L09, L10, L21

Toroidalkaon decay with stoppoed K

L16, (L19), L20

E391a

KL-> π0νν rare decay

L05

SPES-II

hyper-nuclear spectroscopy etc.

KURAMAhyperon scattering* SKS spectrometer is for Day-1 experiments.

L07

Test beam request
LoI-02: Test beam facilities at J-PARC;
Request by High Energy Physics Committee
Must/
Indispensable

Should/requireddesiredmomentum

0.5~2GeV/ceasy tunable

Up to 10GeV/cmom. biteLess than 1%

AnalyzingmagnetIntensity [/sec]

Electrons: 1~10
Inclusive: 1~100
Easily tunable

Up to ~100
Up to ~1000

Particle
species

Unseparated e, mu, pi,K, p, p-bar

DC separator

Time structure

Flat-topPreferred/
optional

e-enriched tertiary

ChopperTest beam options

 Option-3 : 230 π-/s of 2 GeV/c through a 3cmφ hole at 30 GeV x 9µA Realistic proposal will be made by fall this year No budgetary measures at the moment

Preparation for future extension
Phase 1
Extension port withconcrete shielding toavoid soil activation
Future plan
 Muon source (PRISM)
 Anti-proton facility

Table 20High-brightness muon beam facility

Proton beam
Muon monochromatization
Muon beam intensity
Beam energy
Energy spread(PRISM)

100-1000 Hz extraction from 90 bunch operation
phase rotation by FFAG synchrotron
1011-1012 /s for 1014 protons /s
20 MeV (68 MeV/c)+/- (0.5 ~ 1.0 ) MeV

Summary remarks
 The construction of J-PARC 50-GeV experimental facilities is goingon aiming for the completion in 2007 and 2008 for the hadron hall andneutrino facility, respectively.
 We would like that the activity of the hadron beam science shifts
from the 12-GeV PS to J-PARC as soon as possible in view of its twoorders of magnitude higher potentiality.
 We are going to move nearly all valuable resources at the12-GeV PS such as beamline magnets and radiation shielding.
Therefore, the schedule coordination between the 12-GeV
operation and the 50-GeV facility construction is extremelyimportant.
 To start the experimental program at J-PARC, an operation scheme
including experiment funding has to be settled as soon as possible.
Also, the transfer of the 12-GeV PS equipment has to be funded bysome means.