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Possibilities for an Off-Axis Near Detector at NUMI

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Presentation on theme: "Possibilities for an Off-Axis Near Detector at NUMI"— Presentation transcript:

1 Possibilities for an Off-Axis Near Detector at 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 15 December 2002
Steven Manly

3 15 December 2002 Steven Manly

4 Goals of this experiment
Understand neutrino and anti-neutrino cross-sections (both inclusive and exclusive - differential) for E = 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 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! 15 December 2002 Steven Manly

5 Goals of this experiment
Understand neutrino and anti-neutrino cross-sections (both inclusive and exclusive - differential) for E = 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 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) 15 December 2002 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 15 December 2002 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) 15 December 2002 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 15 December 2002 Steven Manly

9 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… 5m On Axis 10m NUMI LE Configuration 20m On Axis 5m NUMI ME 10m 20m 15 December 2002 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. 15 December 2002 Steven Manly

11 Off-Axis vs On-Axis Near Flux
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 OA Near (LE) Far 0.7° OA Near (LE) Near (ME) Beam Far off-axis Near off-axis Near on-axis Unit ev/kton-yr ev/kg-yr  (no osc.) 69.5 68.9 34.6 e+e 0.34 0.57 NC 9.9 11.7 115.5 15 December 2002 Steven Manly

12 Alternate Sites K2K “SciBar” Detector Similar detector
K2K SciBar Event Rates ~20K Events/10 tons fid. (courtesy C. McGrew) K2K “SciBar” Detector Similar detector Lower rates by about an order of magnitude <En>~1.2 GeV NUMI Near Off-Axis Event Rates/ton 15 December 2002 Steven Manly

13 NUMI vs. other locations/expts
BooNE Running now! <En >~0.9 GeV Rates comparable No hall CERN to GS high energy beam 15 December 2002 Steven Manly

14 Possible Sites Possible locations within the NUMI TBM drifts No new tunneling required… Thanks to Rob Plunkett for navigational assistance! 15 December 2002 Steven Manly

15 Site 1: 5-10 meters Off-Axis
Shaft Near Hall Absorber 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 10m 5m Ditch 6m 4.5m 15 December 2002 Steven Manly

16 Site 1: 5-10 meters Off-Axis
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 Shaft Near Hall Absorber Site 1: 5-10 meters Off-Axis 15 December 2002 Steven Manly

17 Site 1: Interaction Rates
Shaft Near Hall Absorber LE+, 10m LE+, 5m ME+, 5m ME+, 10m 15 December 2002 Steven Manly

18 Site 2: 15 meters Off-Axis Located just upstream of shaft
Near Hall Absorber Located just upstream of shaft Wide. Sloped floor (9%). Close to shaft and utility source <En>~1.5 GeV Near (LE) 15 December 2002 Steven Manly

19 Site 2: Interaction Rates
Shaft Near Hall Absorber LE+, 15m ME+, 15m 15 December 2002 Steven Manly

20 Kinematic region 15 December 2002 Steven Manly

21 Site 3: 5-15 meters Off-Axis
Shaft Near Hall Absorber 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>~ GeV 15m 15 December 2002 Steven Manly

22 Site 3: Interaction Rates
Shaft Near Hall Absorber LE+, 11m LE+, 15m ME+, 15m ME+, 11m LE+, 13m LE+, 9m ME+, 13m 15 December 2002 Steven Manly ME+, 9m

23 Site Summary Appropriate sites exist in the NUMI TBM tunnels
Energy Range <En>~ 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 15 December 2002 Steven Manly

24 Conceptual NUMI Near Detector
Modular design Construct above ground piecewise Can add detector or target material as another layer n Active/passive frame around target Active scintillator strip target Active scintillator strip target 15 December 2002 Steven Manly

25 Conceptual NUMI Near Detector
Active scintillator strip target Active scintillator strip target Fully active Plastic scintillator (2x2 cm strips) 2 ton fiducial volume 15 December 2002 Steven Manly

26 Conceptual NUMI Near Detector
Active scintillator strip target Active scintillator strip target Several interaction lengths for / separation Several radiation lengths for photon conversion and electron id 15 December 2002 Steven Manly

27 Conceptual NUMI Near Detector
Active scintillator strip target Active scintillator strip target Investigating the possibility of introducing layers of water-based scintillator with fiber readout 15 December 2002 Steven Manly

28 Conceptual NUMI Near Detector
Active scintillator strip target Active scintillator strip target Can introduce other materials or detectors in layers 15 December 2002 Steven Manly

29 Conceptual NUMI Near Detector
Modular design Construct above ground piecewise Can add detector or target material as another layer n Active/passive frame around target Active/passive frame around target Active scintillator strip target 15 December 2002 Steven Manly

30 Conceptual NUMI Near Detector
Active/passive frame ~contains the events and can act as a veto Active/passive frame around target Active/passive frame around target 15 December 2002 Steven Manly

31 Conceptual NUMI Near Detector
Active/passive veto in front of target Adds some material dependence 15 December 2002 Steven Manly

32 Conceptual NUMI Near Detector
Active/passive absorber behind target for /hadron discrimination plus magnet for  charge determination 15 December 2002 Steven Manly

33 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 n Active/passive frame around target Active scintillator strip target 15 December 2002 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 15 December 2002 Steven Manly

35 Summary Off-Axis Near Detector for Narrow band beam
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.) 15 December 2002 Steven Manly

36 15 December 2002 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 15 December 2002 Steven Manly

38 Site 1: 5-10 meters Off-Axis
Shaft Near Hall Absorber 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 Far 0.7° OA Near (LE) 10m Far 0.7° OA Near (LE) 5m 15 December 2002 Steven Manly

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