1 / 20

Reactor Q 13 in the USA

Reactor Q 13 in the USA. Will discuss Physics case for a “medium” sin 2 2 q 13 ≤ 0.01 reactor experiment. Status of “Midwest” q 13 project at Braidwood, Illinois. Will not discuss Highly advanced, but regrettably suspended Diablo Canyon project.

Download Presentation

Reactor Q 13 in the USA

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript


  1. Reactor Q13 in the USA • Will discuss • Physics case for a “medium” sin22q13≤0.01 reactor experiment. • Status of “Midwest” q13 project at Braidwood, Illinois. • Will not discuss • Highly advanced, but regrettably suspended Diablo Canyon project. • American involvement in Double-Chooz, Daya Bay, KASKA, and other international efforts beyond US borders. • US political situation, reactor or otherwise. Tim Bolton NUFACT 2004-- OSAKA

  2. Physics Case for sin22q13≤0.01 • Reactor-only: • Uniquely clean and precise measurement of q13. • Medium Braidwood style experiment exploits both rate and shape. • Reactor+T2K/Nona (M. Shaevitz) • Medium experiment resolves (45±Dq23)° degeneracy for q23. • Small D-Chooz type experiment may leave ambiguity. • But for T2K/Nona with n+n running: • Minimal impact on mass hierarchy from reactors. • Modest impact on CP violation from reactors. • Caveat: A D-Chooz null result would make this physics tough for everybody. Huber et al. hep-ph/0303232 Tim Bolton NUFACT 2004-- OSAKA

  3. M. Shaevitz Study:  Reactors get q13! • sin22q13(true)=0 • sin22q13(true)=0.05 Tim Bolton NUFACT 2004-- OSAKA

  4. Medium Braidwood-like reactor + n/n off-axis resolves ambiguity. • Result holds even without high precision q23. • D-Chooz may leave degenerate solutions, even with precise q23. q23 45 deg. reflection degeneracy 1.5% dsin22q23 Tim Bolton NUFACT 2004-- OSAKA

  5. Precision MeV n Physics • Robust observable, first order flux cancellation. • Addresses “NuTeV anomaly” at NuTeV precision. • Interesting EW tests (ST plane) at Q2=0. • Challenging singles measurement, needs: • Depth to suppress m spallation. • Borexino-level radioactivity. • Use of low background energy window. • ≤ 1% systematics (calibrations). Tim Bolton NUFACT 2004-- OSAKA

  6. Braidwood Experiment Details • People. • Location. • Layout. • Detectors. • R&D. • Schedule. Tim Bolton NUFACT 2004-- OSAKA

  7. Midwest Q13 Collaboration • ANL: M. Goodman, V. Guarino, D. Reyna • Chicago: E. Abouzaid, K. Anderson, E. Blucher, J. Pilcher, M. Worcester • Columbia: J. Conrad, J. Link, M. Shaevitz • FNAL: L. Bartoszek, D. Finley, H. Jostlein, C. Laughton, R. Stefanski • Kansas State: T. Bolton, J. Foster, G. Horton-Smith, D. Onoprienko, N. Stanton • Michigan: B. Roe • Oxford: S. Biller, N. Jelley • Pittsburgh: D. Naples, V. Paolone • Texas: J. Klein Tim Bolton NUFACT 2004-- OSAKA

  8. Location • <50 km from two US national labs: Fermilab + Argonne National Lab. • ANL has ~50 years of reactor expertise. Tim Bolton NUFACT 2004-- OSAKA

  9. Reactor Complex • But: • Cost risk associated with “green field” site. • Reactor managment presently encouraging, but tough decisions lie ahead. Tim Bolton NUFACT 2004-- OSAKA

  10. Basic Scheme • One near detector at ~270m; at least two far detectors at ~1700m. • Near and far detectors at 450 mwe depth (if bore hole samples confirm). • Identical 6.5m diameter 3-zone (a la D-Chooz) spheres. • Gd-loaded LS fiducial in 25-50 ton range, depending on buffer optimization. • LS g-catcher + non-scintillating buffer. • Passive and active external shielding. • Detectors fully constructed at surface sites. • Detectors lowered down shafts (a la KASKA). • Detectors movable via surface transport for cross calibration. Tim Bolton NUFACT 2004-- OSAKA

  11. Layout Schematic Note: reactor management has agreed to shorten near access tunnel length from 300m to 50m ($$$!). Tim Bolton NUFACT 2004-- OSAKA

  12. Aerial View Tim Bolton NUFACT 2004-- OSAKA

  13. Mechanical Conceptual Design • Lifting points allow full assembly at surface. • Permits far detectors to move to near site for cross calibration. Tim Bolton NUFACT 2004-- OSAKA

  14. “Hoist and Roll” Scheme Left: 750 ton test lift by crawler crane. Right: 200 ton drilling equipment on gantry + self-propelled platform trailer. (ALE Lastra). • “Common” procedure in industry. • Considerably cheaper than tunneling. • Favorable terrain at Braidwood site using truck on gravel road or rails, depending on load stresses. • Clearly requires careful design/implementation studies (underway). Tim Bolton NUFACT 2004-- OSAKA

  15. Hall Layout Tim Bolton NUFACT 2004-- OSAKA

  16. Tim Bolton NUFACT 2004-- OSAKA

  17. Acrylic Sphere Support • Multiple <2.5 cm dia. Spacers. • Assumes simultaneous filling for neutral buoyancy. • Ongoing work at ANL, U. Chicago. Tim Bolton NUFACT 2004-- OSAKA

  18. Software • Parametric and full G4 hit-level simulations (D. Onoprienko). • Good agreement with Chooz measurements (after some pain). • Optimizing geometry (RFID vs. Rg-C vs. RBUF). Tim Bolton NUFACT 2004-- OSAKA

  19. Cost/Schedule • Detailed estimate prepared for underground construction at Braidwood site prepared by independent consultants (Hilton and Associates, Inc.). • Included civil construction; outfitting with pumps; elevators, ventilation, etc.; and decommissioning costs at experiment end. • Permanent surface structures, detectors not yet included. • Detail level sufficient for re-scaling to optimized layouts. • First iteration: two 300 mwe shafts, different detector hall designs, 300m tunnel for near site access: • $35M cost, 39 month construction schedule. • Revised layout: considerably shortened near access tunnel, 450 mwe depth (160m rock+20m soil). • Cost in $25-35M range, <24 month construction schedule. • Detector cost (from MiniBoone scaling) ~ $8M/detector. Tim Bolton NUFACT 2004-- OSAKA

  20. Summary • Compelling physics case for a sin22q13≤0.01 experiment. • Medium scale reactor best short-term choice. • Importantly extends Double-Chooz capabilities (provide ~3×better sin22q13sensitivity; with LBL, resolve q23 45 degree reflection degeneracy; open new field of precision MeV n physics.) • Braidwood site an attractive choice: • High power modern reactor complex with cooperative management. • Simple layout with deep near site and possibility of movable detectors. • Access to national lab infrastructure. • Current status: • Active lab + university-based R&D. • Bore hole study at Braidwood soon that follows up detailed costing studies. • Preparing R&D proposal this Fall towards full proposal in 2005. Tim Bolton NUFACT 2004-- OSAKA

More Related