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Absorbed dose and fluence measurements and simulations at EuXFEL undulator systems

Falowska-Pietrzak, Olga, 1995- (författare)
Stockholms universitet,Fysikum
Hellberg, Fredrik (preses)
Stockholms universitet,Fysikum
Hedqvist, Anders (preses)
Stockholms universitet,Fysikum
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Silverstein, Samuel (preses)
Stockholms universitet,Fysikum
Bassler, Niels (preses)
1: Department of Clinical Medicine, Aarhus University, Aarhus, Denmark 2: Danish Centre for Particle Therapy, Aarhus University Hospital, Aarhus, Denmark
Perakis, Foivos (opponent)
Stockholms universitet,Fysikum
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 (creator_code:org_t)
Stockholm : Department of Physics, Stockholm University, 2023
Engelska.
  • Licentiatavhandling (övrigt vetenskapligt/konstnärligt)
Abstract Ämnesord
Stäng  
  • The European X-Ray Free Electron Laser generates X-ray pulsesas GeV electrons progress in the beam pipe through periodic arrangements of magnets called undulators. An undesired scattered radiation (stray radiation) is also present outside the beam pipe. It may damage not only undulator magnets, but also diagnostic and correction equipment located near undulators. It results in decreased performance of the EuXFEL. As the severity of magnet damage differs for different particles and energies, it is of great importance to properly characterize the stray radiation field in the vicinity of the undulators. In this thesis, results of Gafchromic film dose measurements near EuXFEL undulators are presented. Films were placed at the entrance of the undulator segments, along the undulator permanent magnets and at the front of phase shifters located in the intersections separating two undulator segments. In addition, Monte Carlo simulations of absorbed dose and fluence were performed with Geant4 toolkit to characterize the composition and energy spectra of the radiation field near undulators. Comparison of film measurements and simulations show that theradiation field near the upstream undulator cells may be a result of high-energy electrons interactions with the beam pipe. Almost 99 % of the dose absorbed to the permanent magnets comes from electrons and positrons created through photon interactions with matter. However, the majority of particles are photons. In addition,simulations show that neutrons are also presented within the magnets. Significant doses were measured further away from thepermanent magnets, close to phase shifters installed in the intersections.

Ämnesord

NATURVETENSKAP  -- Fysik (hsv//swe)
NATURAL SCIENCES  -- Physical Sciences (hsv//eng)

Nyckelord

Physics
fysik

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vet (ämneskategori)
lic (ämneskategori)

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