Steven Manly - PowerPoint PPT Presentation

About This Presentation
Title:

Steven Manly

Description:

Steven Manly. University of Rochester. NuInt 02, Irvine, CA. 15 December 2002. Possibilities for an ... Steven Manly. 5. Goals of this experiment ... – PowerPoint PPT presentation

Number of Views:55
Avg rating:3.0/5.0
Slides: 39
Provided by: pasRoc
Category:
Tags: manly | steven

less

Transcript and Presenter's Notes

Title: Steven Manly


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

2
Precision P(nm?ne)
Life is not so simple
3
(No Transcript)
4
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

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

6
Physics Goals of Detector Require
  • Identification and separation of exclusive final
    states
  • Quasi-elastic ?mn??p, ?en?ep
  • 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

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)

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

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
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.

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 (ME)
Near (LE)
12
Alternate Sites
  • K2K SciBar Detector
  • Similar detector
  • Lower rates by about an order of magnitude
  • ltEngt1.2 GeV

13
NUMI vs. other locations/expts
  • BooNE
  • Running now!
  • ltEn gt0.9 GeV
  • Rates comparable
  • No hall
  • CERN to GS
  • No hall
  • high energy beam

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

15
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
16
Site 1 5-10 meters Off-Axis
5 m
10 m
  • Can move detector. ltEngt2-3 GeV
  • 5m gives ltEngt2.8 GeV can go higher but spectrum
    is broad
  • Ditch at upstream end makes getting 15m off-axis
    (1.5 GeV) more difficult

17
Site 1 Interaction Rates
LE, 10m
LE, 5m
ME, 5m
ME, 10m
18
Site 2 15 meters Off-Axis
  • Located just upstream of shaft
  • Wide. Sloped floor (9).
  • Close to shaft and utility source
  • ltEngt1.5 GeV

19
Site 2 Interaction Rates
LE, 15m
ME, 15m
20
Kinematic region
21
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?
  • ltEngt1.5-3 GeV

15m
22
Site 3 Interaction Rates
LE, 11m
LE, 15m
ME, 15m
ME, 11m
LE, 13m
LE, 9m
ME, 13m
ME, 9m
23
Site Summary
  • Appropriate sites exist in the NUMI TBM tunnels
  • Energy Range ltEngt1.5-3 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

24
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
25
Conceptual NUMI Near Detector
Conceptual
Active scintillator strip target
26
Conceptual NUMI Near Detector
Conceptual
Active scintillator strip target
27
Conceptual NUMI Near Detector
Conceptual
Active scintillator strip target
28
Conceptual NUMI Near Detector
Conceptual
Active scintillator strip target
29
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
30
Conceptual NUMI Near Detector
Active/passive frame around target
Active/passive frame around target
31
Conceptual NUMI Near Detector
32
Conceptual NUMI Near Detector
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

Active/passive frame around target
Active scintillator strip target
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. RD 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 RD
    tests

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.)

36
(No Transcript)
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

38
Site 1 5-10 meters Off-Axis
  • Simple More simple to move detector. ltEngt2-3
    GeV
  • 5m gives ltEngt2.8 GeV can go higher but spectrum
    is broad
  • Ditch at upstream end makes getting 15m off-axis
    (1.5 GeV) more difficult
Write a Comment
User Comments (0)
About PowerShow.com