# Presentation: 943718

## Neutrino Physics Opportunitiesfor Fermilab Steering Group 6/12/07

- Andy Lankford
*UC Irvine*

## NPG: Presentations

- 5/10  Gene Beier: *NuSAG Status Report to NSAC*
- 5/14  Peter Meyers:  *NuSAG*
- 5/22  Henryk Piekarz: *A Double, 480 GeV, Fast Cycling **	**Proton Accelerator for Production of Neutrino **	**Beams at Fermilab*
- 5/22  Janet Conrad: *An Ultra-High Statistics Muon **	**Neutrino Scattering Experiment at the TeVatron*
- 5/29  Mats Lindroos: *Beta-beams*
- 5/31  Bonnie Fleming: *Ideas on LArTPC Detectors*
- 5/31  Kate Scholberg: *Neutrino Physics with a Stopped **	**Pion Source*

## Long-Baseline Oscillation Experiments

- Flagship of neutrino physics
- theta_13, mass hierarchy, CP violation
- NuSAG is addressing
- Report to HEPAP expected in mid-July
- NuSAG is relying heavily on BNL-FNAL study
- Examining options for next generation:
- Off-axis Beam vs. Wide-band Beam
- Liquid argon TPC vs. Water cerenkov
- Experiments require as many neutrino interactions as possible
- Neutrino flux
- Detector mass
- Next generation would benefit more from an order of magnitude improvement than a factor of two improvement
- Possible conclusion: Need results from current generation before finalizing next generation
- NPG is to build upon NuSAG report

## Double 480 GeV Proton AcceleratorH. Piekarz

- Two super-ferric rings in TeVatron
- Designed for high beam power
- Note: current booster cannot provide current for more than 4.8 MW
- Note: power via intensity rather than energy preferred
- Produces high energy neutrinos
- Needs very long baselines
- Energies much higher than optimum for U.S.-based experiments
- High energy comes with high intrinsic neu_e bkgd.
- Not rated highly by NPG

## Neutrino Scattering using TeVatron BeamJ. Conrad

- Deep inelastic scattering
- 100x NuTeV
- 50k neu_mu + e elastic scatters
- Needs high statistics
- 3x NuTeV fiducial volume
- 20x NuTeV proton intensity (5E19 POT/yr)
- 2x NuTeV running period
- Unique precision electroweak experiment
- Complements direct BSM exploration of LHC
- NPG viewed physics opportunity favorably

## Beta-beamsM. Lindroos

- Presentation heard by FSG
- Probably for far future
- Akin to neutrino factory
- Not examined carefully for roadmap

## LArTPC DetectorsB. Fleming

- Roadmap from R&D to multi-kiloton
- Includes 50-1000 ton experiments on site
- Several options mentioned
- Cross-sections, fine-grained near-detector for NOvA
- microBooNE: 50T fiducial
- Investigate MiniBooNE low-E discrepancy
- Physics program now + LAr R&D for future program
- Using existing beams
- NPG found above synergy very enticing

## Physics with Stopped Pion SourceK. Scholberg

- Based on SNS proposal
- Stopped pion produces 3 low-energy neus
- Physics:
- Cross-sections for astrophysics (SN physics)
- Coherent elastic neu-nucleus scattering
- (ambitious)
- Sterile neutrino oscillations
- Requires ~1 MW
- NPG found interesting

## Facilities for Neutrino Beams - 1

- #2 High Intensity Proton Sources
- Should include 8 GeV beams
- Supports:
- Oscillation program
- LArTPC experiments onsite
- Stopped pion source
- #7 Proton sources by reconfiguring FNAL collider complex
- Similar to above; supports same physics
- #8 Proton sources with New Booster + 1 GeV Linac
- Similar to above; supports same physics
- #9 Double, 480 GeV, Fast Cycling Proton Accelerator
- Supports oscillation program, but not well
- Competes with other uses of TeVatron

## Facilities for Neutrino Beams - 2

- #10 1 TeV protons from TeVatron
- Supports precision deep-inelastic scattering program
- Could also measure cross-sections with LArTPC
- Competes with other uses of TeVatron
- #13 Beta-beams
- Supports future oscillation program
- In post-ILC era
- Neutrino Factories (should be on list)
- Supports future oscillation program
- In post-ILC era

## Facilities for Neutrino Beams - 3

- Summary:
- Interesting for Neutrino Physics: Mid-term
- #2 High Intensity Proton Sources
- #7 Proton sources by reconfiguring FNAL complex
- #8 Proton sources with New Booster + 1 GeV Linac
- #10 1 TeV protons from TeVatron
- Interesting for Neutrino Physics: Long-term
- #13 Beta-beams
- Neutrino Factories
- Not particularly interesting for Neutrino Physics
- #9 Double, 480 GeV, Fast Cycling Proton Accelerator
- More protons are better
- Competition with other programs (proton economics0
- No clear breakpoints in required intensities
- Could foresee using >1 MW at low energy (e.g. 8 GeV)
- For fixed neutrino flux, NuMI energy may be higher than optimum

## FY09 Opportunities

- Possible investment ideas for FY09 based on neutrino presentations
- LArTPC R&D
- E.g. towards neu_e monitor for NuMI
- Hall for near-detector in NuMI line
- TeVatron neutrino line