Title: Steven Manly
1Possibilities for an Off-Axis Near Detectorat
NUMI
- Steven Manly
- University of Rochester
- NuInt 02, Irvine, CA
- 15 December 2002
2Precision P(nm?ne)
Life is not so simple
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4Goals 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
5Goals 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
6Physics 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
7Goals 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)
8Beam and location
- Off-axis beam exploits kinematics of meson
decay to produce narrow band beam - Beam spectrum determined by meson count and
angle
9Off-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
10NUMI 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.
11Off-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)
12Alternate Sites
- K2K SciBar Detector
- Similar detector
- Lower rates by about an order of magnitude
- ltEngt1.2 GeV
13NUMI vs. other locations/expts
- BooNE
- Running now!
- ltEn gt0.9 GeV
- Rates comparable
- No hall
- CERN to GS
- No hall
- high energy beam
14Possible Sites
- Possible locations within the NUMI TBM drifts.
No new tunneling required - Thanks to Rob Plunkett for navigational
assistance!
15Site 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
16Site 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
17Site 1 Interaction Rates
LE, 10m
LE, 5m
ME, 5m
ME, 10m
18Site 2 15 meters Off-Axis
- Located just upstream of shaft
- Wide. Sloped floor (9).
- Close to shaft and utility source
- ltEngt1.5 GeV
19Site 2 Interaction Rates
LE, 15m
ME, 15m
20Kinematic region
21Site 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
22Site 3 Interaction Rates
LE, 11m
LE, 15m
ME, 15m
ME, 11m
LE, 13m
LE, 9m
ME, 13m
ME, 9m
23Site 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
24Conceptual 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
25Conceptual NUMI Near Detector
Conceptual
Active scintillator strip target
26Conceptual NUMI Near Detector
Conceptual
Active scintillator strip target
27Conceptual NUMI Near Detector
Conceptual
Active scintillator strip target
28Conceptual NUMI Near Detector
Conceptual
Active scintillator strip target
29Conceptual 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
30Conceptual NUMI Near Detector
Active/passive frame around target
Active/passive frame around target
31Conceptual NUMI Near Detector
32Conceptual NUMI Near Detector
33Conceptual 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
34Detector 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
35Summary
- 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.)
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37Those 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
38Site 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