1T.Kobayashi (KEK)

Status of JStatus of J--PARC Neutrino ProjectPARC Neutrino ProjectT2K (TokaiT2K (Tokai--toto--KamiokaKamioka))

Takashi Kobayashi(KEK)

NBI05@FNALJul. 7, 2005

Contents1.T2K experiment2.Facility and Status3.Summary

2T.Kobayashi (KEK)

~1GeV νμ beam(×100 of K2K)

Tokai

T2K experimentT2K experiment

Physics goalsDiscovery of νμ→νe appearance

Precise meas. of disappearance νμ→νx

Kamioka

J-PARC0.75MW 50GeV PS

Super-K: 50 ktonWater Cherenkov

Phase2:4 MW

Phase2:Hyper-K

Long baseline neutrino oscillation experiment from Tokai to Kamioka.

12 countries~60 institutions

~180 collaboratorsDiscovery of CP violation (Phase2)

3T.Kobayashi (KEK)

θTargetHorns Decay Pipe

Super-K.

π decay Kinematics

OA3°

OA0°OA2°

OA2.5°

Statistics at SK(OAB 2.5 deg, 1 yr, 22.5 kt)~ 2200 νμ tot ~ 1600 νμ CC νe ~0.4% at νμ peak

Quasi Monochromatic Beamx 2~3 intense than NBB

Tuned at oscillation maximum

Narrow intense beam: OffNarrow intense beam: Off--axis beamaxis beam振動確率＠Δm2=3x10-3eV2

ν μflu

x

0°

2°

2.5°3°

Eν

(GeV

)

1

0 0 2 8pπ (GeV/c)

5

First Application(ref.: BNL-E889 Proposal)

4T.Kobayashi (KEK)

Eνrec(GeV)

Signal+BGSignal+BG

BGBG

0 1 2 30

10

20

30

40

Sensitivity: Sensitivity: ννee appearanceappearance

( )νμ θθ ELmP e /27.1sin2sinsin 213

213

223

2 Δ⋅⋅≈→

Discovery of νe appearance (θ13,Δm13)

(Pe, θe)

Eν

1010--11

CHOOZCHOOZexcludedexcluded

Δm

13

2(e

V2)

1010--44

1010--33

1010--22

sin22θ131010--221010--33 1010--11 11

~20~20

W/ 10% error for BG subtraction

sin22θ13 >0.006(90%)

νe

p

e

4

OA2o 5years

7

Δm2 = 3x10-3eV2

sin22θ13 = 0.1

Assuming sin2θ23=0.5, δ=0, no matter

5T.Kobayashi (KEK)

δδ(sin(sin22 22θθ))

δδ((ΔΔmm22))

Sensitivity:Sensitivity: ννμμ→→ννμμ disappearancedisappearance

norm (+5%)NQE (+5%)ESK (+1%)beam shape (±20%)beam width (5%)

Stat. error

Stat. only

--68%CL (Δln L=0.5)--90%CL (Δln L=1.36)--99%CL (Δln L=3.32)

Effect of systematic erroron param meas.

Goalδ(sin22θ23)~0.01δ(Δm23

2)~<1×10-4

(OA2.5(OA2.5°°))

Expected precision

6T.Kobayashi (KEK)

Materials and Life ScienceExperimental Facility

Hadron Beam Facility

Nuclear Transmutation

JJ--PARC FacilityPARC Facility

J-PARC = Japan Proton Accelerator Research ComplexJoint Project between KEK and JAERI

3 GeV Synchrotron(25 Hz, 1MW)

Linac

(350m)

50 GeV Synchrotron

(0.75 MW)

500 m

Neutrino to Kamiokande

7T.Kobayashi (KEK)

Location of JAERI at TokaiLocation of JAERI at Tokai--village village

TOKYO

KEK

JAERI

NARITA

KAMIOKA

Tokai-village

Tsukuba

JAERI=Japan Atomic Energy Research Institute

60km

Narita

Kamioka

Tokyo

KEK

8T.Kobayashi (KEK)

January, 2005

JJ--PARC statusPARC status

•Buildings for LINAC and 3GeVPS finished.•North-east part of tunnel for 50GeVPS finished.•South-west part of tunnel will finish in FY2006.•First beam on 50GeV PS

in FY2008

January, 2005

Fast ext. part

9T.Kobayashi (KEK)

decay volume

Near detector

TargetStation

Beam dump/μ-pit280m

130m

Neutrino Beam Line for T2K ExperimentNeutrino Beam Line for T2K Experiment

ComponentsComponentsPrimary proton beam lineTarget/Horn systemDecay pipe (130m)Beam dumpmuon monitorsNear neutrino detector

Special FeaturesSpecial FeaturesSuperconducting Superconducting combined functioncombined functionmagnetsmagnetsOffOff--axis beamaxis beam

To Super-Kamiokande

10T.Kobayashi (KEK)Jan.28, 2005

Fast extraction part

Fast extraction part

Ring orbit

Fast ext. beam

Decay Volume(excavated)

3NBT

11T.Kobayashi (KEK)

F H1F

Q1

PD11.92 deg. bend

PC4PQ5 PH3

PC3 PQ3PQ4

PV2PC2 PC1

1.92 deg. bend

PD2PV1

引き出し基準点x=49615028.58, y=69561283.94

ニュートリノ・ビームライン

PQ2A PQ1

PH1PH2

サスペンション型

クレーン(20t x 2)

FV2

FQ4

FV1

FQ3

FH2

FV2

FQ2

Proton beam lineProton beam line

Preparation section

Normal conducting magnets

Arc Section84.5o, R=105m,Super conductingmagnets

Final Focusing Section

Normal conducting magnets

Specifications0.75MW, 50 GeV (40GeV@t=0)Single turn fast extractionCycle: 3.5 second3.3x1014 protons/spill 8 bunches/4.2μsε=6π mm.mr, Δp/p=0.31%(ε=7.5π mm.mr,Δp/p=0.36%@40GeV)Target station

58ns598ns

4.2μs

0.12sinjection

1.96s

acce

lerati

on 0.7s

0.7sidling

12T.Kobayashi (KEK)

Normal conducting magnetsNormal conducting magnets

• 22 magnets in prep sect and FF sect.– Mineral Insulation Cable (MIC) for magnets > 1MGy/yr,

Other: Polyimide insulation– At high radiation area, quick maintenance mechanism

needed.• Status

– Development of quick maintenance system in progress as common technologies for ν and hadron facility

– Engineering design with FEM done for preparation section– Started procurement of cables and irons for prep. sect.

ビーム振り下げ

FH1F

Q1PD11.92 deg. bend

PC4PQ5 PH3

PC3 PQ3PQ4

PV2PC2 PC1

1.92 deg. b end

PD2PV1

引き出し基準点x=49615028.58, y=69561283.94

ニュートリノ・ビームライン

PQ2A PQ1

PH1PH2

サスペンション型

クレーン(20t x 2)

FV2

FQ4

FV1

FQ3FH2

FV2

FQ2

Dipole Quad. Steer. Total (MIC)12 (5)

(0?)(5?)

1022

3(H)+2(V)2(H)+2(V)

Total 4 9 9

Prep. 2(H) 5FF 2(V) 4

Preparation section

Final focusingsection

Tanaka-san’s talk

13T.Kobayashi (KEK)

Superconducting magnetsSuperconducting magnets• Combined function magnets in arc part

– Dipole Field: 2.587 T, Quad. Field: 18.62 T/m

– Reduce cost while keeping large acceptance

– Use common parts with LHC to reduce cost/risk

• First full size prototype completed– Cooled, current loaded– 7700A (ope. curr. @50GeV + 5%)

achieved w/o any spontaneous quenching

• Contract for mass production made. Start fabrication soon

T.Ogitsu, T.Nakamoto, et.al.,Cryogenic Sci. Center, KEK

Prototype coils completed by Oct. 2004

Feb.21,2005

ビーム振り下げ

FH1F

Q1

PD11.92 deg. bend

PC4PQ5 PH3

PC3 PQ3PQ4

PV2PC2 PC1

1.92 deg. b end

PD2PV1

引き出し基準点x=49615028.58, y=69561283.94

ニュートリノ・ビームライン

PQ2A PQ1

PH1PH2

サスペンション型

クレーン(20t x 2)

FV2

FQ4

FV1

FQ3FH2

FV2

FQ2

14T.Kobayashi (KEK)Vacuum Vessel from Spain

Shell Welding Completed (Dec21,04)Shell Welding Completed (Dec21,04) Put in vertical cryostat forcooling/current loading test (Feb.21,2005)

15T.Kobayashi (KEK)

Superconducting magnetSuperconducting magnet

2.0

(kA)

1.0

3.0

0.0

8.0

7.0

6.0

5.0

4.0

1.0 ManualShut down

Time

50GeV(7345A)

40GeV(5830A)

3.0

2.5

2.0

1.5

1.0

0.5

0.0

B1 (

T)

-4000 -3000 -2000 -1000 0

position (mm)

25

20

15

10

5

0

B2 (T

/m)

B1 B2

Position (mm)

Dip

ole

fie

ld(T

)

19.0T/m2.68T

Quad

rupole

fie

ld (

T/m

)

7700A @ 5A/s

Prototype magnet worked•as designed•without quenchAnother “proof model” worked

@7460A

16T.Kobayashi (KEK)

FFTarget Station

ν beam

Arc

PS

I,C,P

C,P

C,P

I,C,P

C,P

C,P

C,P

C,PC,PC,PC,P

PP

P

C,P

C,P

C,P

I,C,PI,P

Target

FFTarget Station

ν beam

Arc

PS

I,C,P

C,P

C,P

I,C,P

C,P

C,P

C,P

C,PC,PC,PC,P

PP

P

C,P

C,P

C,P

I,C,PI,P

Target

Beam monitorsBeam monitors

• Intensity (I)– Current Transformer (CT)

• Center Position (C) – Loop pickup monitor (LPM)

• Beam Profile (P)– Segmented Secondary Emission Monitor (SSEM)

• Loss monitor– Ionization Chamber

• Prototype made, tested with K2K fast beam• Started final engineering design

Hayato-san’s talk

17T.Kobayashi (KEK)

Target StationTarget Station• Accommodate

– Baffle: Graphite, 32mmφ hole x 1.7m long to protect 1st horn

– Target– 3 Horns

• Area filled with Helium gas– reduce Tritium, NOx

production• Highly radio-activated

– ~1Sv/h,– Need remote-controlled

maintenance system• Need cooling (Helium vessel,

radiation shield,..)

100 cm100 cm1400 2000

900

472

2500

1400

809

1st Horn 2nd Horn 3rd Horn

Target

beam

Baffle

Baffle Trg&1st horn

2nd horn3rd horn

Nakadaira-san’s talk

18T.Kobayashi (KEK)

TargetTarget• Carbon Graphite: 30mm(D)x900mm(L), 2 interaction length (70% int.)• Energy deposit: 58kJ/spill (~20kW)• Equivalent stress (ΔT~200K) ~ 7MPa (<Tensile strength of 37MPa)• Cooled at outer surfaceR&D and Design StatusR&D and Design Status• Helium cooling method designed• Prototype of Graphite target made

– Feasibility of machining proved• Radiation damage of Graphite tested

Prototype productionPrototype production

Nakadaira-san’s talk

19T.Kobayashi (KEK)

100 cm100 cm1400 2000

900

472

2500

1400

809

1st Horn 2nd Horn 3rd Horn

TargetbeamHorn systemHorn system

• Field shape optimization completed.

• 320kA pulsed current operation • Prototype horns are made

– 1st horn inner/outer conductor– 3rd horn inner conductor

• Preparing for pulsing test

Sekiguchi-san’s talk

1st horn outer conductor1st horn inner conductor

3rd horn outer conductor

20T.Kobayashi (KEK)

Decay VolumeDecay Volume3NBT (BT bet. 3GeV&MLF)constructed in 2005

Decay Volume ~110m

OA2oOA3o

Target StationDump

6m thick concrete structure

Cross section:2.2m(W)x2.8m(H)

3.0m(W)x4.6m(H)

Cooling channels(Plate coil)

beam

ConstructionStarted in 2004

• Cover Off Axis angle : 2º~3º• Square box shape made with

water cooled iron plates (T<60ºC)• Filled by 1atm Helium gas• 50m part crossing w/ 3NBT

completed.• Remaining part in 2007&2008

21T.Kobayashi (KEK)

SKHK

3°

2°

3°

2°

DV center

)

3°

2°

1.51°0.02°

°0.784

Beam eye

SK

~8km

HK

Candidate site for HK

3.11°(OAB2° beam axis)3.64°(OAB2.5°)4.16°(OAB3°)

Best Fit 3.43°(OAB2.3° Beam Axis)

Decay pipe

Cover this region

Common decay pipe for SK/HK covering Common decay pipe for SK/HK covering 2~3 deg OA angle2~3 deg OA angle

22T.Kobayashi (KEK)

Civil construction of DVCivil construction of DV

Sep. 2, 2004

Feb. 9, 2005 May 23, 2005

Oct. 26, 2004

23T.Kobayashi (KEK)

Beam dump & Muon monitorBeam dump & Muon monitor

Top view

Beam dump•Graphite blocks

with cooling modules

•Copper blockswith cooling path

beam

Muon monitors•spill-by-spill monitor of

beam direction/intensity•Ionization chambers•Silicon or Diamond

Detectors

Ishida-san’s talk Kurosawa-san’s talk

24T.Kobayashi (KEK)

• First near detectors @280m– 2 detectors: On/Off-axes– On-axis: intensity/direction

• Grid type detectors

– Off-axis: Flux/spect./νint/νe• UA1 magnet + TPC

• Second near detector @ ~2km–– Not in the approved budgetNot in the approved budget

SKp π ν

140m0m 280m 2 km 295 km

Neutrino DetectorsNeutrino DetectorsNot in approved budget

On-axis

Off-axis

280m detectorhall (hole)

Kurimoto-san’s talk

Hiraide-san’s talk

19mφ20mφ

3°

2°

5m

FGDMRD

~14m

SK

ν beam

20mφ

37m

3°

2°

5m

~14m

SK

ν beam

25T.Kobayashi (KEK)

Far DetectorsFar Detectors

1st Phase (2009~, ≥5yrs)Super-Kamiokande(22.5kt)

2nd Phase (201x~?)Hyper-Kamiokande(~540kt)

26T.Kobayashi (KEK)

Schedule of Schedule of νν beam linebeam line

Decay Volume IPrimary Beam Tunnel1st Util. Build.(NU1)Installation Build.(NC)TS (underground)TS buildingTS instrumentation/ testoperation

14 7 10 101 7

2009H21

4 7 10 17 10 11st yr 2nd yr 3rd yr

20062004 2005

44

2008

4 7 10 1Last yr

2007

4 7 10 14th yr

2004.4-2006.32005.4-2007.32006.4-2008.32007.4-2009.3

Target station•const.: ’06~’07•Install: ’08

Proton beam line•const.: ’05~’06•Install: ’08

half of Decay volume•const.: ’04~’05•Install: ’04

Buildings•Const.: ’07

Near detector•const.: ’07~’08•Install: ’08

Beam dump &half of Decay vol.•const.: ’07~’08•Install: ’08

Sta

rtex

per

imen

t

27T.Kobayashi (KEK)

SummarySummary• T2K Experiment

– High intensity superbeam experiment– Off-axis beam– Primary goal: Discovery of νe appearance

• Neutrino beam facility– Construction started in April 2004

• Intensive R&D and design work of beam line components

• Start experiment in 2009See coming talks for technical detail of each

component