Paper 
Title 
Page 
THBP46 
Simulation of the ESS Proton Beam Window Scattering 
591 

 E.D. Fackelman, E. Adli, H.E. Gjersdal, K.N. Sjobak
University of Oslo, Oslo, Norway
 Y. Levinsen, A. Takibayev, C.A. Thomas
ESS, Lund, Sweden



The European Spallation Source produces neutrons used for science by delivering a 5MW proton beam to a tungsten target. The proton beam parameters must remain within a welldefined range during all phases of facility exploitation. The proton beam parameters are measured and monitored by an instrumentation suite, among which are two beam imaging systems. Parameters such as position and beam current density can be calculated from the images, supporting beam tuning and operation. However, one of the two systems may be affected by beam scattering. In this paper, we will focus on modelling the impact of the scattering on the beam on target distribution. The modelling process, involving simulation codes such as Geant4 and twodimensional convolution in Matlab, is described. Initially, Geant4 simulates a scattered pencil beam. The resulting distribution is fitted and can be used similarly to an instrument response in image processing to model any possible beam distribution. Finally, we discuss the results of the scattered beam imaging model, showing the range of applications of the model and the impact of scattering on the beam parameters.


DOI • 
reference for this paper
※ doi:10.18429/JACoWHB2023THBP46


About • 
Received ※ 01 October 2023 — Revised ※ 09 October 2023 — Accepted ※ 14 October 2023 — Issued ※ 21 October 2023 
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