Multiple Coulomb Scattering in Lithium Hydride Absorbers¶

Abstract¶

Multiple coulomb scattering is a well known electromagnetic phenomenon experienced by charged particles traversing materials. However, from recent measurements by the MuScat experiment it is known that the available simulation codes, specifically GEANT4, overestimate the scattering of muons in low Z materials. This is of particular interest to the Muon Ionization Cooling Experiment (MICE) which has the goal of measuring the reduction of a muon beam emittance induced by energy loss in low Z absorbers. Multiple scattering induces positive changes in the emittance in contrast to the reduction due to ionization energy loss. It therefore is essential that MICE measures multiple scattering for its absorber materials; lithium hydride and liquid hydrogen; and validate known simulations against multiple scattering in the data. MICE took data with magnetic fields off suitable for multiple scattering measurements in the spring of 2016.

Paper¶

Published in: Forthcoming
arXiv: Forthcoming
RAL Preprint: Forthcoming
DOI: Forthcoming

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References
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Track positions at upstream tracker station 1 for all particles collected for the 200 MeV/c muon beams during March 2016 with the lithium hydride absorber mounted in the absorber focus coil. (PDF, JPEG)

Track gradients at upstream tracker station 1 for the all particles collected for the 200 MeV/c muon beams during March 2016 with the lithium hydride absorber mounted in the absorber focus coil. (PDF, JPEG)

Number of tracks selected by the analysis for the 172 MeV/c, 200 MeV/c, and 240 MeV/c data sets. (PDF, JPEG)

Time of flight distributions for the 172 MeV/c, 200 MeV/c, and 240 MeV/c data sets. (PDF, JPEG)

Figures showing the agreement between the momentum calculated by the correction upstream and the momentum determined from MC truth.(PDF, JPEG)

Figures showing the agreement between the momentum calculated by the correction downstream and the momentum determined from MC truth.(PDF, JPEG)

Figures showing the residual between the momentum before and after correction upstream and the momentum determined from MC truth.(PDF, JPEG)

Figures showing the residual between the momentum before and after correction downstream and the momentum determined from MC truth.(PDF, JPEG":http://micewww.pp.rl.ac.uk/attachments/download/9233/residual12p6.jpg)

Figures showing the acceptance for downstream tracks when measuring the angle projected in the YZ plane(PDF, JPEG)

Figures showing the acceptance for downstream tracks when measuring the angle projected in the XZ plane(PDF, JPEG)

The results of the scattering analysis projected in the YZ plane using data from all three nominal beam settings. Scattering widths are reported after application of deconvolution. (PDF, JPEG)

The results of the scattering analysis projected in the XZ plane using data from all three nominal beam settings. Scattering widths are reported after application of deconvolution. (PDF, JPEG)

The scattering analysis is repeated at each of the momentum bins scanning across the full range of MICE data. Results are for the X projection. (PDF, JPEG)

The scattering analysis is repeated at each of the momentum bins scanning across the full range of MICE data. Results are for the Y projection. (PDF, JPEG)