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