title: Advances in the design, modelling and operation of high-performance Electron Beam Ion Sources
creator: Pahl, Hannes
subject: ddc-530
subject: 530 Physics
description: Highly charged ions see widespread use in fundamental research, medicine, and industry.  This thesis describes development work carried out to improve on the charge breeding performance of electron beam ion sources (EBIS) and to advance their modelling in computer simulations.  Established expressions for the mathematical modelling of the charge breeding of trapped ions are reviewed and the implementation of a modern software package for the simulation of charge breeding dynamics is put forward.  Simulation results are compared to experimental data containing signatures of dielectronic recombination reflected in the emerging charge state distribution.  REXEBIS, processing rare isotope beams at the ISOLDE facility, has been upgraded with a new, weakly-immersed electron gun to increase its reliability and raise the available electron current density.  Here, a passive magnetic element is used to dampen radial electron beam oscillations resulting from space charge defocusing.  The damping technique is investigated and results of extensive commissioning experiments characterising the efficiency of the upgraded EBIS are presented.  MEDeGUN, a prototype for a \SI{1}{A} Brillouin-type electron gun for medical charge breeding applications, has been characterised at the TwinEBIS test stand.  The measurement campaign reveals multiple critical performance limitations, such as a stagnation of charge breeding and large ion losses, warranting further investigations.  The design study for a dedicated ion beamline which will support future experiments is summarised.
date: 2025
type: Dissertation
type: info:eu-repo/semantics/doctoralThesis
type: NonPeerReviewed
format: application/pdf
identifier: https://archiv.ub.uni-heidelberg.de/volltextserver/35999/1/PhD_Hannes_Pahl_SubmissionVersion_PdfAcompat.pdf
identifier: DOI:10.11588/heidok.00035999
identifier: urn:nbn:de:bsz:16-heidok-359991
identifier:   Pahl, Hannes  (2025) Advances in the design, modelling and operation of high-performance Electron Beam Ion Sources.  [Dissertation]     
relation: https://archiv.ub.uni-heidelberg.de/volltextserver/35999/
rights: info:eu-repo/semantics/openAccess
rights: http://archiv.ub.uni-heidelberg.de/volltextserver/help/license_urhg.html
language: eng