Multiple Coulomb Scattering in Lithium Hydride Absorbers¶
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.
Published in: Forthcoming
RAL Preprint: Forthcoming
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)
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)