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Radiological Shielding for a Ramsey Neutron-Beam Experiment at the European Spallation Source

Werselius, Lovisa LU and Blidner, Vilma LU (2025) PHYL01 20251
Particle and nuclear physics
Department of Physics
Abstract
In this thesis, the required shielding for biologically safe radiation levels during the operation of the shortHIBEAM beamline at the European Spallation Source (ESS) in Lund, Sweden, is presented. The shortHIBEAM beamline is 25 meter long, including a 10- meter magnetically shielded section, a detector and an optional shutter system inside the bunker wall. The shortHIBEAM beamline model was designed with the geometric program Comblayer, and the model was used to simulate the experiment in PHITS. Based on the simulations, the design was optimized until the dose rate was below 1.5 µSv/h outside the beamline during normal operation, and in the cave when the shutter was in place. The results include dimensions and materials for the beamline,... (More)
In this thesis, the required shielding for biologically safe radiation levels during the operation of the shortHIBEAM beamline at the European Spallation Source (ESS) in Lund, Sweden, is presented. The shortHIBEAM beamline is 25 meter long, including a 10- meter magnetically shielded section, a detector and an optional shutter system inside the bunker wall. The shortHIBEAM beamline model was designed with the geometric program Comblayer, and the model was used to simulate the experiment in PHITS. Based on the simulations, the design was optimized until the dose rate was below 1.5 µSv/h outside the beamline during normal operation, and in the cave when the shutter was in place. The results include dimensions and materials for the beamline, the experimental cave, the beamstop and the shutter system. The calculations show that the shielding design criteria have been met for the shutter system, but not fully satisfied for the beam stop and beamline shielding. Further optimization is required, necessitating some minor adjustments. This work provides an important contribution to the HIBEAM project and will be integrated into the Technical Design Report (TDR) for the shortHIBEAM beamline, which is planned for submission to ESS in February 2026. (Less)
Please use this url to cite or link to this publication:
author
Werselius, Lovisa LU and Blidner, Vilma LU
supervisor
organization
course
PHYL01 20251
year
type
M2 - Bachelor Degree
subject
language
English
id
9207429
date added to LUP
2025-08-06 09:09:03
date last changed
2025-08-06 09:09:03
@misc{9207429,
  abstract     = {{In this thesis, the required shielding for biologically safe radiation levels during the operation of the shortHIBEAM beamline at the European Spallation Source (ESS) in Lund, Sweden, is presented. The shortHIBEAM beamline is 25 meter long, including a 10- meter magnetically shielded section, a detector and an optional shutter system inside the bunker wall. The shortHIBEAM beamline model was designed with the geometric program Comblayer, and the model was used to simulate the experiment in PHITS. Based on the simulations, the design was optimized until the dose rate was below 1.5 µSv/h outside the beamline during normal operation, and in the cave when the shutter was in place. The results include dimensions and materials for the beamline, the experimental cave, the beamstop and the shutter system. The calculations show that the shielding design criteria have been met for the shutter system, but not fully satisfied for the beam stop and beamline shielding. Further optimization is required, necessitating some minor adjustments. This work provides an important contribution to the HIBEAM project and will be integrated into the Technical Design Report (TDR) for the shortHIBEAM beamline, which is planned for submission to ESS in February 2026.}},
  author       = {{Werselius, Lovisa and Blidner, Vilma}},
  language     = {{eng}},
  note         = {{Student Paper}},
  title        = {{Radiological Shielding for a Ramsey Neutron-Beam Experiment at the European Spallation Source}},
  year         = {{2025}},
}