1. nuSTORM at Fermilab D Adey
2013 Workshop on Neutrino Factories, Super-beams and Beta-beams
Working Group 3 – Accelerator Topics
Institute of High Energy Physics Beijing
21st August 2013

2. Contents Concept Motivations/Benefits Accelerator complex Detectors
Implementation

3. NeUtrinos from STORed Muons
GeV POT
Pion capture
Transport line and injection
π → μ decays in ring
μ storage for ~ 70 turns
Nμ = (POT) X (π/POT) X εcollection X εinj X (μ/π) X Adynamic X Ω
1021 POT in 5 years of 120 GeV in Fermilab PIP era
0.1 π/POT
μ/POT = 8x10-3 at end of first straight
Adynamic = 0.6 (FODO)
Ω = Straight/circumference ratio (0.39) (FODO)
1.9 X 1018 useful μ decays
Precise flux with known flavour content
Note: nuSTORM will be limied to 1020 POT/yr

4. ν physics motivations Sterile neutrinos Cross sections
Giunti arXiv:
Cross sections in few GeV range not as well known as low or high energies
One of the largest systematic errors for oscillation experiments
No realistic standard candle
Old data is proving difficult to interpret
Gallium: 2.7σ evidence for νe disappearance
LSND: 3.8σ evidence for νe appearance
MiniBooNE: 3.8σ evidence for νe and νe appearance
Reactor: 3.0σ evidence for νe disappearance
LEP limits to 3 light, interacting neutrinos
Short baseline experiment

5. Sterile neutrino search
1.5 cm steel plates
2 view 0.75cm scintillator bars with WLS fibres and SiPM readout
~13m 1.3kton fiducial mass
SCTL generates magnetic field
νe → νμ CC Signal (LSND CPT)
νe → νe CC Background (range)
νμ → νμ CC Background (curvature)
νe → νe NC Background (range)
νμ → νμ NC Background (range)
Inject only one sign π
Cut π decay neutrinos by timing
μ CC penetrates much further than e CC and NC
Toroidal field discriminates signal (focussed) from background (defocussed) muons

6. Simple cuts-based approach Improved by MVA approach
kNN and neural nets are also considered
Signal efficiency
Backgrounds
Sterile neutrino exclusion at LSND best fits remains strong against systematic assumptions and magnetic field reduction
νe analysis in progress

7. Additional detector concepts
Software framework for characterisation of performance of generic detector types within NuStorm context
Ar TPC and TASD in front of MIND-like detector for muon ranging
Slot for cross-section target (H)
TASD prototypes underway with MVA analyses
Straw-tube tracker

8. Implementation at Fermilab

9. Implementation at Fermilab
Use Main injector main abort line extracting at 120GeV
Target station, pion transfer line and injection into storage ring
Pion decay in first straight
Near detector at 20m
Far detector ~ 2000m

10. Proton Beamline Elements
Majority of magnets standard design
Main injector abort spare line

11. MI Abort line Reconfiguration
3/27/2013
Michael Geelhoed Fermilab AD EBD 11
MI Abort line Reconfiguration
Q001 Q002 Q Bermpipe

12. Target 100KW (prepare for 400KW) 120GeV from main injector
Graphite target within NuMI-like horn
Li lens would be beyond state of art
MARS studies suggest 0.1 pions / POT
Significant irradiation of first quadrupoles in transport line

13. Target hall Decay straight Proton extraction
Possible muon extraction for low momentum use
Target hall
Decay straight
Proton extraction

14. Pions injecting into muon storage ring requires dual optics solution

15. Near detector hall at 20m
Facility for both near detector for oscillation studies (200T magnetised iron scintillator) and other near detectors (cross section studies, neutrino detector test area)

16. Far Detector Hall D0 assembly building at a good baseline
Placement of 1.3kT Magnetised Iron Scintillator detector (SuperBIND)

17. Instrumentation of the stored muon beam allows for the precise measurement of the neutrino flux

18. Costing Sub System Cost M$ Primary Beam Line 28.5 Target Station 37.9
Transport Line
16.5
Decay Ring
135.2
Near Hall
23.51
SuperBIND
27.12
Site work 27
Other
2.5
Sub Total
298.2
Management
37.13
Total
335.3

19. Summary Work on sterile search and cross section physics potential
Proton source, target, capture, injection and decay ring work
Far detector reconstruction and analysis
Near detector concepts
Implementation at sites at Fermilab
Proposal submitted to Fermilab PAC has received approval
Thanks to nuStorm colleagues for slides, in particular A. Bross, M. Geelhoed, R. Bayes, C. Tunnel, D. Neuffer, A. Liu

20. Questions?

21. Backups

22. Implementation at CERN
Use SPS at 60GeV
10μs pulse (compared to 2μs at FNAL)
Use North area
Proportion of preparatory work not site specific

23. Rates

25. Radiation hard magnets (Cozzolino - BNL)
High temperature and radiation tolerant quadrupoles under investigation at Brookhaven