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Status of Neutrino Beamline Construction

Status of Neutrino Beamline Construction. K. Nishikawa IPNS, KEK 2006 ． 12 ． 4. The Neutrino Beam-Line. Target-Horn System. Target Station. Muon Monitoring Pit. Final Focusing Section. 295km to Super-Kamiokande. Preparation Section. 100m. SCFM at ARC Section. Beam Dump.

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Status of Neutrino Beamline Construction

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  1. Status of Neutrino Beamline Construction K. Nishikawa IPNS, KEK 2006．12．4

  2. The Neutrino Beam-Line Target-Horn System Target Station Muon Monitoring Pit Final Focusing Section 295km to Super-Kamiokande Preparation Section 100m SCFM at ARC Section Beam Dump Decay Volume Near Neutrino Detector

  3. Components 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 Features Superconducting combined function magnets Off-axis beam (2~2.5deg) Construction: Apr.2004~Mar.2009 Neutrino Beam Line for T2K Experiment Target Station decay volume 280m Beam dump/m-pit Near detector To Super-Kamiokande

  4. Primary 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-line Preparation Section 50GeV Preparation Section Extraction area Arc Section Final Focus Section

  6. Primary 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 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 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 parttested and moved smoothly at liquid-nitrogentemperature. Moving mechanism for normal-conducting part also tested. To be adopted with several minor modifications. OTR

  9. Secondary Beam Line Beam Dump(BD) •graphite core in helium vessel TS BD DV Target station (TS) •Target & horns in helium vessel Decay Volume (DV) •94m long helium vessel •6m thick concrete shield Muon monitor in muon pit • Civil construction of underground part will finish soon. • (10cm thick iron) • Helium vessel being manufactured • 50m part already constructed • Civil construction of downstream part just started Spill-by-spill monitor of muon intensity/profile

  10. Target Station Top part Bottom part Cooling channels • Civil construction of • underground part will finish soon. • He vessel will be installed • from Aug. 2007. • Helium vessel is being manufactured • at the factory.

  11. Target Graphite 26mm(D)x900mm(L) Heat load: 58kJ/spill (~20kW) Thermal shock (DT~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 Prototype

  12. Electromagnetic horns target Beam Horn1 Horn2 Horn3 • 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. 3rd Horn 1st Horn • The support module for the 3rd horn was produced. • This 12tons iron box hangs the 3rd horn.

  13. Decay 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 Middle part (50m-L) Feb. 2005 Most upstream part

  14. Beam Dump / Muon Monitor Beam 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 • Fabricationof He vessel plates: FY2007 • Assemble/installation: FY2008 Graphite blocks First module • Two Independent System • Semiconductor detector array • Ionization chamber array • Spill –by-spill monitor for the muon profile center • Prototype being tested w/ beam

  15. Neutrino Detector: ND280 10m • 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 17.5m Off-axis 0.2T B1 23m On-axis 29m B2 Beam 33m B3 • Civil construction • will start soon.

  16. Schedule of n beam line • Beam dump & • half of Decay vol. • const.: ’07~’08 • Install: ’08 • Target station • const.: ’06~’08 • Install: ’08 • Near detector • const.: ’07~’08 • Install: ’08 • Proton beam line • const.: ’05~’06 • Install: 07, ’08 2004.4-2006.3 2005.4-2007.3 • half of Decay volume • const.: ’04~’05 • Install: ’04 2006.4-2008.3 2007.4-2009.3 • Buildings • Const.: ’07

  17. Summary • 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

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