Pressure rise in medical cyclotron liquid targets: Transient analysis

Transient behavior of proton-beam bombarded liquid-targets are studied at various initial conditions at the TR13 cyclotron at TRIUMF. Depending on the initial condition, experiments show a range of different responses from steady-state to self-sustained oscillations. To address this, a system of equ...

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Bibliographic Details
Published in:Applied radiation and isotopes 2018-06, Vol.136, p.87-100
Main Authors: Jahangiri, Pouyan, Martinez, D. Mark, Hoehr, Cornelia
Format: Article
Language:English
Subjects:
Beam-fluid interaction
Liquid target
Medical cyclotron
PET isotopes
Radiolysis
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Summary:Transient behavior of proton-beam bombarded liquid-targets are studied at various initial conditions at the TR13 cyclotron at TRIUMF. Depending on the initial condition, experiments show a range of different responses from steady-state to self-sustained oscillations. To address this, a system of equations based on the conservation of mass and energy is proposed. Coupling between the beam and fluid-density and chemical reactions driven by the beam (radiolysis) are identified as the main reasons to describe this behavior. Excellent qualitative agreements are achieved. •A model based on conservation of mass and energy is developed to address the transient behavior of liquid targets.•The initial condition defines the final response ranging from steady-state to self-sustained oscillations.•Two hypotheses are tested to address the oscillations: (a) Beam-fluid density coupling (b) Radiolysis and flow circulation.
ISSN:0969-8043
1872-9800
DOI:10.1016/j.apradiso.2018.01.034