1

Status of Neutrino Beamline Construction

K. Nishikawa

IPNS, KEK

2006 ． 12 ． 4

2

Preparation SectionPreparation Section

SCFM at ARC SectionSCFM at ARC Section

Target-Horn SystemTarget-Horn System

Target StationTarget Station

Decay VolumeDecay VolumeBeam DumpBeam Dump

Final Final FocusingFocusingSectionSection

Muon Muon Monitoring PitMonitoring Pit

Near Neutrino DetectorNear Neutrino Detector

295km to 295km to Super-KamiokandeSuper-Kamiokande

The Neutrino Beam-LineThe Neutrino Beam-Line

100m100m

3

decay volume

Near detector

TargetStation

Beam dump/-pit280m

Neutrino Beam Line for T2K ExperimentNeutrino Beam Line for T2K ExperimentComponentsComponents Primary proton beam line

Normal conducting magnets

Superconducting arc

Proton beam monitors

Target/Horn system

Decay pipe

Beam dump

muon monitors

Near neutrino detector

Special FeaturesSpecial Features

Superconducting Superconducting combined combined

functionfunction magnets magnets

Off-axis beam (2~2.5deg)Off-axis beam (2~2.5deg)

Construction: Apr.2004~Mar.2009

To Super-Kamiokande

4

Primary beam linePrimary beam line

• Preparation section– NC magnet,2D(H),5Q,4str– 750W loss

• Arc section– 28 superconducting combined

function magnets – D2.6T,Q18.6T/m, L=3.3m– 1W/m loss

• FF section– NC, 2D(V), 4Q, 4str– 250W loss

• Bending– H: 84.5o

– V: 3.1~3.6o downward in FF sect. (OA angle 2~2.5o)

• Proton beam monitors– Intensity, Profile, Position, Loss

5

Tunnel for Primary Beam-lineTunnel for Primary Beam-line

50GeV

Preparation Section

Preparation Section

Arc SectionFinal Focus Section

Extraction area

6

Primary line componentsPrimary line components

• Normal-conducting magnets

- Installation in coming July for preparation section

- Fabrication of FF magnets in progress,

and to be installed in FY2008.• Power supply

- Spec. examination for assignment to magnets be done

• Vacuum

- Beam pipe installed in magnets for prep.

- Intra-magnet beam pipe being designed.• Beam plug

- ready for installation in coming summer• Collimator

- re-examining aperture due to optics change.

7

Superconducting magnets and cryogenicsSuperconducting magnets and cryogenics

• SC magnets– R&D since 2001– Successfully developed and tested– Mass production started in FY2005– 17 magnets completed– 6 “doublet” (2mag in 1 cryostat)

completed– Installation in FY2008

• Cryogenics– Design completed– Contract made– Manufacturing started

Cryo. Sci. C. and Cryo. G., IPNS

8

Beam MonitorsBeam Monitors• Configuration - Position : Electro-static monitor (ESM)

- Profile : Segmented Secondary Emission Monitor (SSEM), OTR

- Intensity : CT - Loss monitors (BLM): Ion. chamber • Status- ESM :

ESM#0 and ESM #1 successfully made and tested

Bidding for all Prep ESM in progress

- SSEM

Chamber bidding be placed soon

Moving mechanisms of SSEM for super-conducting part tested and moved smoothly at liquid-nitrogen temperature.

Moving mechanism for normal-conducting part also tested.

To be adopted with several minor modifications.

Beam loss monitor will be placed along the beam line.

FFTS-Beam

PS

I,C,P

C,P

I,C,P

C,P

C

CC,P

TGT

C,PC,P

C,P

C,P

C,P,C,I I,C,P

C,P

Arc

C,P

C,P

C,P C,PC,P

FFTS-Beam

PS

I,C,PI,C,P

C,PC,P

I,C,PI,C,P

C,PC,P

CC

CCC,PC,P

TGT

C,PC,PC,PC,P

C,PC,P

C,PC,P

C,P,C,I I,C,PI,C,P

C,PC,P

Arc

C,PC,P

C,PC,P

C,PC,P C,PC,PC,PC,P

Intensity(CT)

Center(ESM)

Profile(SSEM)

2 9 9

0 5 3

2 6 5

Prep. Sect.

Arc sect.

FF sect.

Intensity(CT)

Center(ESM)

Profile(SSEM)

2 9 9

0 5 3

2 6 5

Prep. Sect.

Arc sect.

FF sect.

OTR

9

DV

TS

BD

Beam Dump(BD)•graphite core in helium vessel

Decay Volume (DV)•94m long helium vessel•6m thick concrete shield

Secondary Beam LineSecondary Beam Line

Target station (TS) •Target & horns in helium vessel Muon monitor

in muon pit

Spill-by-spill monitor of muon intensity/profile

•50m part already constructed•Civil construction of downstream part just started

•Civil construction of underground part will finish soon.•(10cm thick iron)Helium vessel being manufactured

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Target StationTarget Station

•Civil construction of underground part will finish soon.•He vessel will be installed from Aug. 2007.

•Helium vessel is being manufactured at the factory.

Top part

Bottom part

Cooling channels

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TargetTarget• Graphite 26mm(D)x900mm(L)• Heat load: 58kJ/spill (~20kW)• Thermal shock (T~200K) ~

7MPa (<Tensile strength 37MPa)• Forced flow Helium gas cooling• Remote maintenance

• The target full prototype is being manufactured.

• The He circulation system achieved >200m/s flow at the (imitated) target surface.

• Installation in FY2008

PrototypePrototype

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Horn1 Horn2Horn3

target

BeamElectromagnetic hornsElectromagnetic horns

• As endurance test, 1st horn prototype have been operated with 8.5E5 pulses without serious troubles.

• The 3rd Horn was produced and connected serially with the 1st horn.

• The long term test at 320kA with this configuration just started and will continue until the end of August.

• The 320kA operation with full setup at Fuji-Hall is being prepared.

1st Horn3rd Horn

•The support module for the 3rd horn was produced.

This 12tons iron box hangs the 3rd horn.

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Decay VolumeDecay Volume• 94m-L iron helium vessel cooled by water• 6m concrete shields• ~150kW heat on iron walls and concrete• Middle part (50m-L) was already constructed.• Construction of most upstream and downstream parts just started.

Cooling channels

Feb. 2005

3NBT

6m厚コンクリート躯体

ディケイボリューム９４ｍ ビームダンプターゲットステーション

Middle part (50m-L)Most upstream part

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Beam Dump / Muon MonitorBeam Dump / Muon Monitor

• 98 graphite blocks cooled by Al modules.• Production of Graphite blocks finished.• First module was assembled.• Machining of graphite blocks: FY2007• Production of cooling modules: FY2007• Fabrication of He vessel plates: FY2007• Assemble/installation: FY2008

• Two Independent System

– Semiconductor detector array

– Ionization chamber array

• Spill –by-spill monitor for the muon profile center

• Prototype being tested w/ beam

Array of ICs

Gas flow

160

cm

160 cmGas flow

160

cm

160 cm

Beam dumpMuon monitor

Graphite blocks

First module

Off-axis Off-axis

On-axisOn-axis

B3

B2

B1

0.2T

10m

23m

29m

33mBeam

•Detectors

On-axis neutrino profile measurement

Off-axis measure neutrino on the direction to Super-Kamiokande before neutrino oscillation

Design is in progress and will be fixed soon.

• Technology

Scintillator + WLS opt. Fiber + Multipixel APD (new photo sensor)

test of samples before mass production is being performed

TPC with micromegas --> prototype is being build

Neutrino Detector: ND280Neutrino Detector: ND28017.5m

•Civil construction will start soon.

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Schedule of Schedule of beam line beam line

2004.4-2006.32005.4-2007.32006.4-2008.32007.4-2009.3

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

Proton beam line•const.: ’05~’06•Install: 07, ’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

Primary line tunnelNC mags (Prep. Sect.)SC/NC in FFCryogenics

TS civil/buildingEquipments in TSDecay volumeBeam dump

Neutrino monitor

Sec

onda

ryP

rimar

y

101 7Facility Design

7 10

20062004 2005 2009H21

4 7 10

2007

47 10 11st yr 2nd yr 3rd yr

14

2008

4 7 10 1Last yr

7 10 14th yr

44

Inst.

Inst.

Inst.Comm.

Inst./Test ope.

Civil Civil Inst.

Inst.CivilInst.Civil mag

inst

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SummarySummary

• Beam line construction is on schedule

• No fatal problem so far

• Superconducting/normal magnets are being manufactured

• Production of other components are

in progress or in preparation

• Civil constructions are on schedule.

• Almost all components will be installed in FY2008

• Beam will start in Apr. 2009