the analysis of timing measurements at the muon ionization cooling experiment
DESCRIPTION
AMDG. The analysis of timing measurements at the Muon Ionization Cooling Experiment. Mark Rayner The University of Oxford IOP 2010, 31 st March, University College London. Why do we want high quality muon beams?. q 13 , d CP. n B /n g =6.1x10 –10 ¹ 10 –18 *. Neutrino Factory. - PowerPoint PPT PresentationTRANSCRIPT
Timing measurements at the MICE experiment – 1
The analysis of timing measurements at the Muon Ionization Cooling Experiment
Mark RaynerThe University of Oxford
IOP 2010, 31st March, University College London
AMDG
Timing measurements at the MICE experiment – 2
Why do we want high quality muon beams?
IonizationCooling
Muon Cooling Channel
NeutrinoFactory
MuonCollider
13, CP
direct CP violation searches
s-channel (e.g. Higgs) cross-section enhanced by
(m /me)2 ~ 40,000
Multi TeV 2-body interactions
negligible synchrotron radiation, small footprint
nB/n
=6.1x10–10
10–18 *
MICE
* W. Buchmuller. R. Peccei. T. Yanagida. Annu. Rev. Nucl. Part. Sci. (2005)
The Universe contains 1.64 billion photons for every proton or neutron.* Why are there so few? Could neutrinos reveal the answer?
How do you turn a grapefruit into a ping pong ball in a microsecond?
Timing measurements at the MICE experiment – 3
The MICE cooling channel lattice elementFeasibility Study-II of a Muon-Based Neutrino Source, ed., S. Ozaki, R. Palmer, M. Zisman, and J. Gallardo, BNL-52623 (2001).
15 MV/m40 degrees
pz0 = 200 MeV/c
pz = 14 MeV/c
Timing measurements at the MICE experiment – 4
SFOFO focussing – minimize absorber
G. Penn, MuCool note 71 Beam Envelope Equations in a Solenoidal Field
Timing measurements at the MICE experiment – 5
The elements of an ideal cooling demonstration
1 Build one lattice element and treat it as a black box2 Spectrometers – measure (x, px, y, py, t, pz)
3 A Neutrino Factory beam
Timing measurements at the MICE experiment – 6
Difficulties with the demonstration
15 MV/m40 degrees
10 MV/m90 degrees
ScatteringLandau E
Timing measurements at the MICE experiment – 7
Reconstruction procedure
Estimate the momentum
p/E = S/t
Calculate the transfer matrix
Deduce (x’, y’) at TOF1 from (x, y) at TOF0
Deduce (x’, y’) at TOF0 from (x, y) at TOF1
Assume the path length S zTOF1 – zTOF0
s leff + F + D
Track through through each quad,
and calculate
Add up the total pathS = s7 + s8 + s9 + drifts
Q6 Q7 Q8 Q9
TOF1TOF0
zTOF1 – zTOF0 = 8 m
Timing measurements at the MICE experiment – 8
Characterization of the ISIS muon beam line at RAL
3359
-610.0 205.8
18.99 -17.68 3600
1.17 -1.61 82.3 17.43
-107.6 -5.0 -5.84 11.81 602
Cov(x, px, y, py, pz) =
UNITS: mm and MeV/c
Timing measurements at the MICE experiment – 9
Comparison of matched and measured simulated input beams N
(m
m)
Timing measurements at the MICE experiment – 10
Conclusion
Timing measurements are surprisingly important at MICE• Longitudinal phase space must be phased correctly with the RF
• Phase space measurements by the TOFs aid tracking before the lead degrader• …and the phase space measurement of low amplitude muons
The TOF detectors have already been used to characterize the beam line• First muons identified last January
• Beam line magnet optical designs have been experimentally verified• Cooling will possible even without transverse re-weighting of the beam
The TOFs’ capability for measuring longitudinal phase space can also investigate:• The non-conservation of emittance for large pz
• Emittance exchange between longitudinal and transverse phase space • 6D cooling with LiH wedge absorbers
LDS