1 of 12 Stephen Brooks JAI Advisory Board, February 2006 Neutrino Factory Muon Beam Production...
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![Page 1: 1 of 12 Stephen Brooks JAI Advisory Board, February 2006 Neutrino Factory Muon Beam Production Studies.](https://reader036.fdocuments.in/reader036/viewer/2022081603/56649f1d5503460f94c34e6f/html5/thumbnails/1.jpg)
Stephen BrooksJAI Advisory Board, February 2006
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Neutrino Factory Muon Beam Production Studies
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Stephen BrooksJAI Advisory Board, February 2006
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Confusing Acronyms• I am a DPhil student1 with Oxford Particle
Physics and part of the JAI• I actually work at RAL (a site of CCLRC) in the
ASTeC Intense Beams Group• Nationally, my research contributes to the UKNF
project2 (funded by PPARC)– Specifically, WP1: Conceptual Design3
• Internationally, this year it contributes to the NF Scoping Study (ISS)4
– Specifically, the accelerator study group5
[1] Supervisor: John Cobb, Oxford PP[2] Project leader: Ken Long, Imperial College[3] WP manager: Chris Prior, ASTeC IB Group, RAL[4] Project leader: Peter Dornan, Imperial College[5] Group coordinator: Mike Zisman, LBNL
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Stephen BrooksJAI Advisory Board, February 2006
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Thesis Title
• “Muon Capture and Cooling Schemes for the Neutrino Factory”
• So far I’ve concentrated on muon capture
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Stephen BrooksJAI Advisory Board, February 2006
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Problem
• The neutrino factory is (at least) a tertiary beam facility:
p+ » on target ± ± » ,e,
• Efficient capture of the pions as they decay to muons is a critical step
• Resultant beam must obey constraints longitudinally (E, bunch length) and transversely (emittance < acceptance)
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Stephen BrooksJAI Advisory Board, February 2006
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Research Activity (so far)
• Simulations of pion production in target– Optimal proton energy (or energies)– Target material choice
• Tracking of particles up to cooling– Finding the most efficient capture system
• Comparison, optimisation of schemes
– Also defining what we want from the target
• Cooling modelling preparation
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Stephen BrooksJAI Advisory Board, February 2006
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UKNF Muon “Front End”
Solenoidal decay channelRF phase rotation(reduces energy spread)
Target: difficult engineering challenge in itself, covered by UKNF WP2
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Stephen BrooksJAI Advisory Board, February 2006
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Target Simulations
• Particle production setup:
• Used MARS15 code• Scanned possible proton energies• Four materials studied so far
– Ta (solid), Hg (liquid jet), C (granular?), Cu
NF International Scoping Study (ISS); also GEANT4 benchmarking by K. Walaron
20cm for Ta … 66cm for C
1cmCylinder of material
Protons
Pions
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Stephen BrooksJAI Advisory Board, February 2006
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Target Results"PR2.2" Probability Grid Yield (MARS15)
0
0.005
0.01
0.015
0.02
0.025
0.1 1 10 100 1000
Proton Energy (GeV)
Par
ticl
es p
er p
.GeV
Tantalum piplus
Tantalum piminus
Mercury piplus
Mercury piminus
Carbon piplus
Carbon piminus
Copper piplus
Copper piminus
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Stephen BrooksJAI Advisory Board, February 2006
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Particle Tracking Features
• Starts with MARS15 output
• Cannot use paraxial approximation, so 3D– Nonlinear dynamics e.g. spherical aberration– (Somewhat) realistic geometry, obstructions
• Includes ± ± and muon, kaon decays
• Supports lattice optimisation ranges– Novel multi-parameter approach– Genetic algorithm
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Stephen BrooksJAI Advisory Board, February 2006
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Simulation
• Challenge: high emittance of target pions– Here they come from a 20cm tantalum rod
Evolution of pions from 2.2GeV proton beam on tantalum rod target
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Stephen BrooksJAI Advisory Board, February 2006
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Optimisation Network
• Internet-based computer grid being used– 20 million simulations run, 100s of users– Several lattice-ranges submitted
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Stephen BrooksJAI Advisory Board, February 2006
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Muon Cooling
G.H. Rees at RAL conceptually designed a “cooling dogbone” lattice– Future use for tracking/optimising code– Will compare with John Cobb using ICOOL
• Must include ‘energy absorbers’ (material)• At Oxford, the ELMS study has computed
the real muon cross-sections needed– I’ve studied how to integrate this with my code– Wade Allison, Simon Holmes’ speciality (next!)
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Stephen BrooksJAI Advisory Board, February 2006
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Stephen BrooksJAI Advisory Board, February 2006
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Alternative Design
Over 80% caught in linac bucket
Chicane phase rotation decreases the bunch length