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Instruments 2018, 2(4), 24; https://doi.org/10.3390/instruments2040024

Dielectric-Filled Reentrant Cavity Resonator as a Low-Intensity Proton Beam Diagnostic

Paul Scherrer Institut, Forschungsstrasse 111, PSI 5232 Villigen, Switzerland
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Received: 23 September 2018 / Revised: 2 November 2018 / Accepted: 5 November 2018 / Published: 7 November 2018
(This article belongs to the Special Issue Diagnostics for Beam and Patient Monitoring)
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Abstract

Measurement of the proton beam current (0.1–40 nA) at the medical treatment facility PROSCAN at the Paul Scherrer Institut (PSI) is performed with ionization chambers. To mitigate the scattering issues and to preserve the quality of the beam delivered to the patients, a non-interceptive monitor based on the principle of a reentrant cavity resonator has been built. The resonator with a fundamental resonance frequency of 145.7 MHz was matched to the second harmonic of the pulse repetition rate (72.85 MHz) of the beam extracted from the cyclotron. This was realized with the help of ANSYS HFSS (High Frequency Structural Simulator) for network analysis. Both, the pickup position and dielectric thickness were optimized. The prototype was characterized with a stand-alone test bench. There is good agreement between the simulated and measured parameters. The observed deviation in the resonance frequency is attributed to the frequency dependent dielectric loss tangent. Hence, the dielectric had to be resized to tune the resonator to the design resonance frequency. The measured sensitivity performances were in agreement with the expectations. We conclude that the dielectric reentrant cavity resonator is a promising candidate for measuring low proton beam currents in a non-destructive manner. View Full-Text
Keywords: beam diagnostics; ANSYS HFSS; network analysis; scattering parameters; resonance frequency; Q factor beam diagnostics; ANSYS HFSS; network analysis; scattering parameters; resonance frequency; Q factor
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Srinivasan, S.; Duperrex, P.-A. Dielectric-Filled Reentrant Cavity Resonator as a Low-Intensity Proton Beam Diagnostic. Instruments 2018, 2, 24.

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