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Possibilities for an Off-Axis Near Detector at NUMI

Possibilities for an Off-Axis Near Detector at NUMI. Steven Manly University of Rochester NuInt ‘02, Irvine, CA 15 December 2002. DIS. QE. Precision P( n m  n e ). Life is not so simple.

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Possibilities for an Off-Axis Near Detector at NUMI

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  1. Possibilities for an Off-Axis Near Detectorat NUMI Steven Manly University of Rochester NuInt ‘02, Irvine, CA 15 December 2002

  2. DIS QE Precision P(nmne) Life is not so simple Steven Manly

  3. Steven Manly

  4. Useful for the JHF, MINOS programs as well! Valuable service for next generation  oscillation expts. Physics is compelling! Gives FNAL relevance in the post-LHC, lingering ILC indecisiveness or German ILC world! Goals of this experiment • Understand neutrino and anti-neutrino cross-sections (both inclusive and exclusive - differential) for E = 1.5-3.0 GeV • Look at nuclear dependence of same • Possibly a useful near experiment for a NUMI far off axis experiment to do  oscillations and maybe  CP violation Steven Manly

  5. Physics of this is interesting too! Quark-hadron duality (Bodek, Jeschonnek, session 3) measure s (Horowitz, session I) Compare e and  scattering (Wood, session 5) Goals of this experiment • Understand neutrino and anti-neutrino cross-sections (both inclusive and exclusive - differential) for E = 1.5-3.0 GeV • Look at nuclear dependence of same • Possibly a useful near experiment for a NUMI far off axis experiment to do  oscillations and maybe  CP violation Steven Manly

  6. Physics Goals of Detector Require… • Identification and separation of exclusive final states • Quasi-elastic mn–p, ene–p • Single 0, ±final states • Muon and electron energy measurement • Detection of NC and CC reactions • NC reconstruction from beam En constraint • Different Nuclei in Target • Nuclear physics and cross-section studies benefit • Iron, Water, Hydrocarbons all far detector candidates Steven Manly

  7. Goals + practicality  define experiment • NUMI off-axis beam - (beam exists, can tune energy, energy is appropriate for cross-section studies of interest) • Near detector (high statistics per ton) • Fully active medium (want to see recoil p) Steven Manly

  8. Beam and location • Off-axis beam exploits kinematics of meson decay to produce narrow band beam • Beam spectrum determined by meson count and angle Steven Manly

  9. Off-Axis Beams NUMI Near On and Off-Axis Beams (beam sim. courtesy M. Messier) • Illustration at NUMI near detector site • Peak energy shifts lower • Width decreases • High energy tail suppressed • Rate significantly decreased • Mimics far detector flux at some angle… On Axis 5m 10m NUMI LE Configuration 20m On Axis 5m NUMI ME 10m 20m Steven Manly

  10. NUMI vs. other locations/expts • NUMI Near On-Axis • Flux comparison (see next slide). • Pros and cons of wideband beam. • High E tail feed-down into NC. • JHFnu • Will run 2008 at earliest. Designed flux is comparable. • 280m fine-grained near detector for this physics is planned. • Overlap between NUMI and JHF proponents. Steven Manly

  11. e+e 0.34 0.34 0.57 Beam Far off-axis Near off-axis Near on-axis Unit ev/kton-yr ev/kg-yr ev/kg-yr  (no osc.) 69.5 68.9 34.6 NC 9.9 11.7 115.5 Off-Axis vs On-Axis Near Flux OA Near (LE) • Advantages on-axis • Higher rate. Access to broadband beam. • Better measurements of CC processes • Advantages off-axis • Narrowband beam • Reconstruction of NC processes • Small corrections to measurement of backgrounds off-axis Far 0.7° OA Near (ME) Near (LE) Steven Manly

  12. K2K SciBar Event Rates ~20K Events/10 tons fid. NUMI Near Off-Axis Event Rates/ton (courtesy C. McGrew) Alternate Sites • K2K “SciBar” Detector • Similar detector • Lower rates by about an order of magnitude • <En>~1.2 GeV Steven Manly

  13. NUMI vs. other locations/expts • BooNE • Running now! • <En >~0.9 GeV • Rates comparable • No hall • CERN to GS • No hall • high energy beam Steven Manly

  14. Possible Sites • Possible locations within the NUMI TBM drifts. No new tunneling required… • Thanks to Rob Plunkett for navigational assistance! Steven Manly

  15. Shaft Absorber Near Hall Ditch 10m 5m Site 1: 5-10 meters Off-Axis • Located in near hall access tunnel • Wide, with personnel access to near hall • Flat floor, easy access to shaft • Relatively easy to bring utilities to site 6m 4.5m Steven Manly

  16. Shaft Absorber Near Hall Site 1: 5-10 meters Off-Axis 5 m 10 m • Can move detector. <En>~2-3+ GeV • 5m gives <En>~2.8 GeV; can go higher but spectrum is broad • Ditch at upstream end makes getting 15m off-axis (1.5 GeV) more difficult Steven Manly

  17. Shaft Absorber Near Hall Site 1: Interaction Rates LE+, 10m LE+, 5m ME+, 5m ME+, 10m Steven Manly

  18. Shaft Absorber Near Hall Near (LE) Site 2: 15 meters Off-Axis • Located just upstream of shaft • Wide. Sloped floor (9%). • Close to shaft and utility source • <En>~1.5 GeV Steven Manly

  19. Shaft Absorber Near Hall Site 2: Interaction Rates LE+, 15m ME+, 15m Steven Manly

  20. Kinematic region Steven Manly

  21. Shaft Absorber Near Hall Site 3: 5-15 meters Off-Axis • Upstream of absorber • Wide, unfinished tunnel. Sloped floor (9% grade). • Not an attractive site • Far from shaft and utility source • Interferes with absorber utitilies? Radiation? • <En>~1.5-3+ GeV 15m Steven Manly

  22. Shaft Absorber Near Hall Site 3: Interaction Rates LE+, 11m LE+, 15m ME+, 15m ME+, 11m LE+, 13m LE+, 9m ME+, 13m Steven Manly ME+, 9m

  23. Site Summary • Appropriate sites exist in the NUMI TBM tunnels • Energy Range <En>~1.5-3+ GeV • Details… • occupancy after NUMI installation (early 05?) • NUMI maintenance, operations conflicts? • utilities and outfitting • movable detector to vary angle and therefore energy • It appears possible to avoid new excavation Steven Manly

  24. Active scintillator strip target n Conceptual NUMI Near Detector Conceptual • Modular design • Construct above ground piecewise • Can add detector or target material as another layer Active/passive frame around target Active scintillator strip target Steven Manly

  25. Active scintillator strip target Fully active Plastic scintillator (2x2 cm strips) 2 ton fiducial volume Conceptual NUMI Near Detector Conceptual Active scintillator strip target Steven Manly

  26. Active scintillator strip target Several interaction lengths for / separation Several radiation lengths for photon conversion and electron id Conceptual NUMI Near Detector Conceptual Active scintillator strip target Steven Manly

  27. Active scintillator strip target Investigating the possibility of introducing layers of water-based scintillator with fiber readout Conceptual NUMI Near Detector Conceptual Active scintillator strip target Steven Manly

  28. Active scintillator strip target Can introduce other materials or detectors in layers Conceptual NUMI Near Detector Conceptual Active scintillator strip target Steven Manly

  29. n Conceptual NUMI Near Detector • Modular design • Construct above ground piecewise • Can add detector or target material as another layer Active/passive frame around target Active/passive frame around target Active scintillator strip target Steven Manly

  30. Active/passive frame ~contains the events and can act as a veto Conceptual NUMI Near Detector Active/passive frame around target Active/passive frame around target Steven Manly

  31. n Active/passive veto in front of target Adds some material dependence Conceptual NUMI Near Detector Steven Manly

  32. n Active/passive absorber behind target for /hadron discrimination plus magnet for  charge determination Conceptual NUMI Near Detector Steven Manly

  33. n Conceptual NUMI Near Detector • Modular design • Construct above ground piecewise • Can add detector or target material as another layer • Modular design • Construct above ground piecewise • Can add detector or target material as another layer Active/passive frame around target Active scintillator strip target Steven Manly

  34. Detector Capabilities • Small fiducial volume OK • 2 tons is sufficient to get 100K events at 2 GeV • Observe recoil protons • Important for n–p, n–p0, etc. • 0 , – reconstruction • Adds a lot of mass. Muon charge for nbar mode needs power. • Embedded Materials and Detectors • E.g., RPC layers in plastic. R&D initially, then backgrounds • Sampling layers of thin material for nuclear targets • Done in past: SOUDAN2, K2K SciFi • Oxygen Rich Targets: H2O-based scint? Acrylic? • Same sites could be used for other detector R&D tests Steven Manly

  35. Summary • Off-Axis Near Detector for • Neutrino Cross-section physics • Neutrino Oscillation “Engineering” • Narrow band beam • Highly active, modular detector • Based on scintillating plastic strips • Candidate sites exist without new excavation • Significant work needed before proposal • Detector Design, Cost, Site Prep., MINOS Cohabitation • Demonstration of Cross-Section Measurements under real conditions (finite beam width, resolutions, etc.) Steven Manly

  36. Steven Manly

  37. Those Expressing Interest… R. Ent, S. Wood Jefferson Lab E. Christy, C. Keppel, I. Niculescu Hampton University and Jefferson Lab A. Bodek, H. Budd, P. de Barbaro, G. Ginther, S. Manly, K. McFarland*, W. Sakumoto, P. Slattery, M. Zielinski University of Rochester *scientific contact Steven Manly

  38. Shaft Absorber Near Hall Far 0.7° OA Far 0.7° OA Near (LE) Near (LE) 10m 5m Site 1: 5-10 meters Off-Axis • Simple More simple to move detector. <En>~2-3+ GeV • 5m gives <En>~2.8 GeV; can go higher but spectrum is broad • Ditch at upstream end makes getting 15m off-axis (1.5 GeV) more difficult Steven Manly

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