11 Status of Neutrino Beamline Construction T.Kobayashi IPNS, KEK Jan.8, 2008 J-PARC PAC

2 2 Preparation Section SCFM at ARC Section Target-Horn System Target Station Decay Volume Beam Dump Final Focusing Section Muon Monitoring Pit Near Neutrino Detector 295km to Super-Kamiokande The Neutrino Beam-Line 100m Construction: Apr ~ Mar (5yrs)

T.Kobayashi (KEK) Summary of Status Conceptual Design Engineering Design Real Production Installation Proton Beam monitorFeb.~ Superconducting magnetsFeb~ CryogenicsApr~ Normal Conducting magnets Vacuum system TargetAug.~ HornAug.~ Target Station Beam WindowJul~ Decay Volume Beam DumpAug~ Muon monitor08/09 All components are in production phase Installations is starting as scheduled

44 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: 84.5 o –V: 3.1~3.6 o downward in FF sect. (OA angle 2~2.5 o ) Proton beam monitors –Intensity, Profile, Position, Loss

55 Tunnel for Primary Beam-line 50GeV Preparation Section Arc Section Final Focus Section Extraction area Completed in Dec. 2006

66 Primary line components Level-measurement for the primary tunnelbein done. Delivery of superconducting magnet (doublet) SC magnets –23 (/28) mags, 9 (/14) “doublets” completed –Up to 28 mags, 12 dblt’s in FY2007 (by Mar.2008) –Corrector mags being fabricated at BNL Normal-conducting magnets –11 mags in prep.section installed and aligned. –Fabrication of FF mags in progress, inst. In 2008 Misc. –Level meas. in progress to monitor ground sink.

7 7 Proton beam monitors Position: ESM –9 prep ESMs delivered –ARC ESMs being manufactued Profile: SSEM –Chambers and Moving mechanisms for Prep SSEMs delivered, installation in this FY. –Chambers and Moving mechanisms for SC part will be manufactured soon –SSEM sensor will be assembled/installed in the next FY Intensity: CT –Final design fixed –All parts are ordered –Prep CTs will be assembled/installed in this FY Loss: Ionization chamber –Commercially available (used by J- PARC acc group)‏ –Layout/configuration fixed –Twenty monitors are purchased in this FY

88Target Graphite outer tube. Core rod is inside this tube. Ti-alloy container Graphite 26mm(D)x900mm(L) Forced flow Helium gas cooling in Ti-alloy container Remotely exchangeable Full-spec He flow test w/ mockup succeeded Day-1 target delivered. Full-spec He-flow test w/ real target being prepared

9 Electromagnetic horns 1 st Horn 3 rd Horn Long term test at 320kA with 1 st horn prototype and 3 rd horn finished –Minor problems are indentified and being fixed before day-1. The 1 st Horn for day-1 is under production, will be delivered in Mar. The 2 nd Horn is under production in US, will be delivered in April x x st horn 3 rd horn

10 Full setup Test of Horn and Demonstration of its Remote Maintenance Scenario at Fuji, KEK In preparation now. The 320 kA operation is scheduled in February. Necessary improvements are identified and being solved. 3 rd Horn Support Module Full Setup Hung by remote sling tool

11 p beam horns pions target To decay volume Iron shield Concrete shield He vessel Target Station Overcame water food problem during excavation in early 2007 Installation of the helium vessel(~470ton, 1000m 3 ) finished, passed vacuum test in Nov as scheduled Construction of surface building starts soon and will finish in June 2008.

12 Decay Volume 94m-L iron helium vessel cooled by water Middle part was constructed in Upstream part (20cm t Iron) was installed&tested in Nov 2007 as scheduled Downstream parts will be finished by Aug Feb Middle part Upstream part Downstream part Sep Dec. 2007

13 Beam Dump 98 graphite blocks cooled by water-pipe embedded Al-casting block Layout of pipes & Al-casting method developed and established All parts are in production and will be ready by the end of Mar.2008 –Graphite blocks being machined, ~1/4 delivered –First Al-cooling module delivery in Jan (out of 14) –Helium vessel iron plates (200mm t ) Module assembly will be finished by the end of Mar.2008 Installation from Aug Beam dump Module assembly Prototype module

14 Muon Monitor Spill-by-spill monitor for the muon profile center (= beam direction) Long term test of prototype at FNAL/NuMI beamline (FNAL-T968 test exp.) Engineering design of detectors almost finished Design of the support structure ongoing Installation in fall-winter 2008 Si PIN diode array Ionization chamber array Beam T2K prototype detectors installed behind NuMI/MINOS MUMON Si signal vs NuMI intensity T968 preliminary IC signal/proton after correction with pressure 3days 1%

15 Construction schedule Beam will start in April 2009, 15month from now. Installation of almost all components in 2008 –SC magnets from Feb, Target/Horn from July, –SC/Horn in-situ ope. test from 2009, Intrlock inspection Mar Schedule is tight –Need careful coordination with civil construction/accelerator commissioning schedule but WE CAN DO (if requested budget is secured). Primary line Secondary line

16 Hadron production measurements at CERN-SPS NA61 (SHINE) experiment Thick target Thin target Measure hadron (  /K) production from Graphite target –to predict Near and far energy spectra (<2~3%) Near to far spectrum extrapolation (<2~3%)  e contami. (from K,  ) (<2~3%) First data taking successfully finished in Oct., 2007 (1month) –Beam: 30GeV proton –Thin target (2cm t 4%int ):~ 500k int. –Replica target (90cm, 80%int): ~180k int. (Goal: 1M int. for both) –Intense analysis started Measurements in 2008 planned –DAQ rate: ~1Hz  ~100Hz

17 Request for beam In the 1 st J-PARC PAC, T2K is approved with –to achieve T2K goal sin 2 2  13 =0.008 (90%CL,  =0) in ~5yrs (w/ design intensity) Highest priority in the first few years is –To reach the highest sensitivity, and –To publish the physics results We set our first goal –Sensitivity of better than current upper bound ~0.14 (90%CL, CHOOZ) To achieve this goal, we request –100kW x 10 7 s beam by around summer 2010 (Proposal)

18 Summary Many milestones achieved in 2007 –Water problem during TS excavation fixed and UG part completed on schedule –Huge Helium vessel of TS installed and passed vacuum test on schedule –Long term full-current test of 1 st and 2 nd horn done –Horn full-system support test. (Operation test soon) –Day-1 Target Delivered, etc,… Beam line construction is on schedule Installation of most components in 2008 –SC mags inst. from Feb, Tgt/Horn from July, etc. –Careful coordination and hard work necessary We can start beam in Apr –If requested budget is secured Request 100kW x 10 7 s beam by around summer 2010 –To reach world highest sensitivity, and –to publish first physics result in 2010