us participation in the t2k beamline and the 280 m near detector

Chang Kee JungNuSAG, June 05

US Participation in

The T2K Beamline and the 280 m Near Detector

First NuSAG Meeting, Washington D.C.First NuSAG Meeting, Washington D.C.June 1, 2005June 1, 2005

Chang Kee JungChang Kee JungState University of New York at Stony BrookState University of New York at Stony Brook

for the T2K US B280 Collaborationfor the T2K US B280 Collaboration


T2K (Tokai to Kamioka)T2K (Tokai to Kamioka)

0.75 MW 50 (40) GeV PS off-axis beam:

(2.5o nominal, 2o~3o coverage) ~1GeV energy

→ → ee appearance

→ → xx disappearancem2

23) ~ 104 eV2 and(sin2223 ) ~ 0.01NC measurementNeutrino interaction studies

First long baseline neutrino oscillation experiment proposed to measure Project approved by the Japanese Government in Dec. 2003 Data taking will start in Apr. 2009


T2K Experiment and Detector ComplexT2K Experiment and Detector Complex

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beam

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T2K Scope

Approved in Japan

US B280 Proposal

Not yet approved

US 2km Proposal

Two separate

US proposals


J-PARC Accelerator ComplexJ-PARC Accelerator Complex

(200 MeV)

(40 GeV)


T2K Neutrino Beamline at J-PARCT2K Neutrino Beamline at J-PARC


Offaxis Beam - Narrow Intense BeamOffaxis Beam - Narrow Intense Beam


280m Near Detector (ND280)280m Near Detector (ND280)


T2K Sensitivity on T2K Sensitivity on


Changes since LOI and Changes since LOI and Updated SensitivityUpdated Sensitivity

LOI (2003)

Current

Beam Energy

50 GeV

40 GeV

Off-axis Angle

2o 2.5o

Decay Vol Length

80 m 130 m

Horn Configuration

Re-optimized

slight reduction in the statistics

and slight increase in the ebackground

0.01 sin2213

10-3

10-2


Sensitivity to Sensitivity to ee appearance appearance


Muon-neutrino DisappearanceMuon-neutrino Disappearance


Design and Construction StatusDesign and Construction Status


Combined Function Combined Function Superconducting MagnetsSuperconducting Magnets

RHIC dipole RHIC quad

R&D Funded by U.S.-Japan CollaborationWork in JFY03 ~$150k @BNLFinal design (KEK)

Combined Function Bend and focus

Original plan20 SC dipoles + 20 SC quads

BNL and Stony Brookreevaluation

28 combined function SC magnetscost savingscoupled dipole+quad require correctors


Target and Horn SystemTarget and Horn System

Target:2.6MJ in 5msAluminum cannot withstand.Only low-Z material such as graphite or beryllium.

1st Horn 2nd Horn 3rd Horn

Targetbeam

High intensity beam Larger inner conductor diameter higher current & three horns

Beam Characteristics: 4.2 s pulses in every 3.5 s8 (58 ns) bunches/pulse3 x 1014 protons/pulse


Decay VolumeDecay Volume


Decay Pipe ConstructionDecay Pipe Construction


T2K ScheduleT2K Schedule


T2K International Collaboration T2K International Collaboration and its Organizationand its Organization

• 148 Physicists from 52 institutions from 12 countries

• Spokesperson: K. Nishikawa (Kyoto U., current K2K Spokesperson)

• International (Interim) Board of Representatives (IBR)

– Spokesperson, KEK representative, ICRR representative and 13 regional representatives

Acts as an interim executive committee

US Reps: C.K. Jung (IBR Chair), K. McFarland and H. Sobel

• Project Coordinators

• Working Groups

– Beamline, Proton beam monitors, Target&Horn, Beam line control/electronics, Muon monitor&280m detectors, 2km detectors

• New International Collaboration Agreement is being prepared by a committee chaired by Jung


Proposed US Contributions to the Proposed US Contributions to the T2K Neutrino Beamline and ND280 T2K Neutrino Beamline and ND280

“The overall philosophy adopted in selecting our contributions to the T2K experiment is to identify critical components that match our

expertise and experience”

Many of the items we proposed to contribute were requested by the Japanese T2K

leadership


T2K US B280 CollaborationT2K US B280 Collaboration

• 34 Members from 6 Institutions (as of May 2005)

• BNL

– S. Bellavia, M. Goldhaber, M. Harrison, H. Kirk, N. Simos and Peter Wanderer

• University of Colorado

– L. Bartoszek, R. Nelson and Eric Zimmerman

• Lousiana State University

– J. Goon, S. Hatakeyama, Thomas Kutter and B. Svoboda

• Stony Brook University

– Chang Kee Jung, K. Kobayashi, G. Lopez, Clark McGrew, Peter. Paul, A. Sarrat, L. P. Trung, L. Whitehead and C. Yanagisawa

• University of Rochester

– A. Bodek, R. Bradford, H. Budd, J. Chvojka, Steve Manly, Kevin McFarland, J. Park, W. Sakumoto, J. Steinman

• University of Washington

– H. Berns, R. Gran and Jeff Wilkes


US B280 Activities US B280 Activities

decay pipe

Near detector

TargetStation

-pit280m

130m

Combined function

Superconducting Magnet R&D

And Corrector Coil construction (BNL)

Neutrino Horns and Target R&D

and Horn 2 construction (Colorado)

Target Testing (BNL, Stony Brook)

GPS Time Synchronization (Washington)

ND280 Off-axis Fine Grained detector

P0D (Rochester, Stony Brook, Washington)

SMRD (LSU)

Software/Physics Simulation

CT Proton Beam Monitor (LSU)

Proton Beam Monitor Electronics (Washington)


Superconducting Corrector CoilSuperconducting Corrector Coil

Unique facility in BNL direct coil winding on the beam pipeBNL Serpentine Design automatic cancellation of the non-uniform end fields!


Completed Corrector PrototypeCompleted Corrector Prototype

Completed and successfully tested this spring now at KEK to be used as a spare propose to build 4 more


T2K Neutrino Horn 2T2K Neutrino Horn 2

U. Of Colorado

and

Bartoszek Engineering

Eric Zimmerman of U. of Colorado has experience with the MiniBooNE and NuTeV neutrino horn systems participates in the T2K target and horn system R&D, engineering and design; proposes to build Horn2 at CU w/ Bartoszek Engineering


ND 280m Detector RequirementsND 280m Detector Requirements

• On-axis (0o)– Monitor neutrino beam direction and stability

– Measure neutrino flux

– Relatively simple detector

• Off-axis (~2o)– measure and e neutrino fluxes and the spectra.

– study interaction (CC-QE, non-QE, 0, )

– candidate detector designs considered for FGD

þ Only carbon target: scintillator bar detector (K2K Scibar)

þ Active oxygen target (water+liquid scintillator+WLS fiber)

þ Thin passive oxygen (water) target with sampling cal/tracking

US Interest: experience with the D0 preshower detector (Stony Brook) and the MINERvA (Rochester)


ND280 Off-axis DetectorND280 Off-axis Detector

~ 3mUp/CentralECAL

P0D Water Rich Target

P0D Fully Active Target

~ 2.5mCharged Particle

Tracking

ECAL

SMRD in UA1 Magnet Yokes


P0D LayersP0D Layers

Water + “Carbon” Target

“Carbon” Target

white: scintillator, mesh: water, red: lead foil

Water = (Water + “Carbon”) - (“Carbon”) MCP-MAPMT


Gamma Ray ReconstructionGamma Ray Reconstruction

• High Recon. Eff.

– > 80% for Eγ > 100 MeV

– 70% at Eγ = 50 MeV

• Efficiency uniform over volume

• EM Energy Resolution

– 10% + 3%/sqrt(GeV)

Water “Carbon”

Efficiency vs Z position in P0D

200 MeV


P0D NC P0D NC ππ˚ Reconstruction˚ Reconstruction

• Require

– No μ/π track

– “Separated” Showers in P0D

– Projected vertex in Fid.

• Eff. > 50% above 200 MeV/c

• Bkgd from CC events ~ 20 %

– All BKGD events have a pizero

• Expect ~8000 reconstructed π˚ per year

440 MeV/c π˚

Activity in ECAL


Summary of the T2K US B280 Summary of the T2K US B280 CollaborationCollaboration

Proposed Contributions to T2KProposed Contributions to T2K

Item Base Cost (k$) Contingency (%) Subtotal (k$)

SC Corrector Coil 338 16 513

CT Proton Beam Monitor 104 25 132

Proton Beam Monitor Electronics 25 40 35

2nd Neutrino Horn 632 31 836

GPS System 88 21 106

ND280 P0D 1,851 49 2762

ND280 SMRD 222 44 320

Total Project Cost (TPC) 3260 39 4704


ConclusionsConclusions

• T2K Beamline and ND280 are already approved and funded (~$160M) in Japan

– Beamline construction underway

– First beam expected on target April 1, 2009

• US B280 collaboration proposes a modest contribution (<$5M) to critical components of the beamline & ND280

– Strong partnership developed between Japanese and US leadership through K2K and SuperK

Provide strong intellectual and organizational contributions

• US is well positioned to participate in the forefront science of the T2K experiment with a modest investment

• A formal proposal will be submitted to DOE in June 2005


The EndThe End


T2K Sensitivity to T2K Sensitivity to 1313 as a function of CP-phase as a function of CP-phase

((1212 contribution subtracted) contribution subtracted)

us participation in the t2k beamline and the 280 m near detector

Documents