Fast TOF for Muon Cooling Experiments Robert Abrams Muons, inc.
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Transcript of Fast TOF for Muon Cooling Experiments Robert Abrams Muons, inc.
Fast TOF for Muon Cooling Experiments
Robert AbramsMuons, inc.
Muons, Inc. Overview• Founded by Rol Johnson to further the realization of a muon
collider• Funded mainly by DOE SBIR awards (partners include FNAL, Jlab,
NIU, U of Chicago, IIT, ODU, …)• Currently doing R&D on various aspects of muon collider
technology– Cooling channel design– Associated magnet technology– Associated RF technology– Related testing and measurements, including using fast TOF technique
to improve cooling measurements• Currently Muons, Inc. has a Phase I SBIR with Henry Frisch to use
LAPPD counters (prototypes?) in muon cooling experiments and to explore TOF spectrometer applications
12/01/2010 2Fast Timing Workshop-Crakow RJA
G4Beamline
• Developed by Muons, Inc. as a user-friendly interface to GEANT4
• Provides root-output files, visual and graphic interfaces to Open Inventor, other enhancements
• Suitable for design of beams, detectors, etc.• Can be downloaded (free) from
www.muonsinc.com, with users manual, example scripts
12/01/2010 Fast Timing Workshop-Crakow RJA 3
Schematic of Muon Collider/Neutrino Factory at Fermilab
Possible to fit a 4TeV Muon collider within FNAL site
Illustration of cooling – reduction of emittance
12/01/2010 4Fast Timing Workshop-Crakow RJA
Potential TOF Applications
• Muon cooling– Replace existing TOF counters with faster counters in
MICE experiment at RAL– Use fast TOF counters in MANX extension to MICE– Use fast TOF counters in muon cooling experiments at
FNAL (MANX and other proposed cooling channels)– Explore possibilities for spectrometer applications
• Other– Large area, fast TOF detectors for neutrino
experiments, collider experiments, nuclear physics, etc.
12/01/2010 5Fast Timing Workshop-Crakow RJA
Layout of MICE Experiment at RAL
SolenoidalSpectrometer
LH2 RF1 LH2 RF2 LH2 Cooling Channel Section
SolenoidalSpectrometer
TOF0 TOF1TOF2
Muon Beam~250 MeV/c
Current TOF counters ~ 50-60ps resolution, with ~ few cm space resolution.Used mainly for synchronizing with RF. MICE is a 4-D emittance reduction measurement.MICE channel gives ~10-15% emittance reduction.Proposing to replace with 5-10 ps TOF counters with sub mm space resolution.
AerogelCherenkov Ctr Aerogel
Cherenkov Ctr
12/01/2010 6Fast Timing Workshop-Crakow RJA
Resolution Improvement Example
Predicted Pz Resolutions for the MICE experiment, based on the MICE solenoidal spectrometer,
and for fast TOF measurements 5 ps and 10 ps resolutions, (a) as a function of Pz and (b) as a function of Pt.
12/01/2010 7Fast Timing Workshop-Crakow RJA
Emittance reduction illustration
Possible MANX Channel Test at RAL (Extension of MICE)
MANX is intended to measure the 6-D emittance reduction (without RF)
HCC is “helical cooling channel”, a helical solenoid filled with high pressure gas or liquidMANX channel gives emittance reduction of ~factor of 2.
New, fast TOF counters (TF0, TF1, TF4) as in MICE layoutWith TF2 and TF3 may replace solenoidal spectrometers and use TF1-TF2 and TF3-TF4 to measure momenta.
12/01/2010 8Fast Timing Workshop-Crakow RJA
Helical Cooling Channel (3.2m Long)
12/01/2010 Fast Timing Workshop-Crakow RJA 9
Coil Design Trajectories
Path lengths along channel Traversal time vs Momentum
∆t ~ 50psPer MeV/c
Evolution to Long Cooling Channel(Need RF to restore lost PLongit)
12/01/2010 Fast Timing Workshop-Crakow RJA 10
Helical Solenoid with RF cavitiesBetween coils
Single cavityand coils detail
Assembly model
Summary
• Fast TOF counters can improve muon cooling measurements
• Muon cooling experiments can be useful for testing several panels of LAPPD modules.
• Currently doing simulations of fast TOF for muon cooling experiments
• Overview of muon collider design and cooling section was presented
12/01/2010 Fast Timing Workshop-Crakow RJA 11