Author: Duperrex, P.-A.
Paper Title Page
WEPGW083 Quadrated Dielectric-Filled Reentrant Cavity Resonator as a Proton Beam Position Diagnostic 2676
SUSPFO108   use link to see paper's listing under its alternate paper code  
  • S. Srinivasan, P.-A. Duperrex, J.M. Schippers
    PSI, Villigen PSI, Switzerland
  Funding: This project has received funding from the European Union’s Horizon 2020 research and innovation programme under the Marie Sk³odowska-Curie grant agreement No 675265
Low proton beam intensities (0.1-40 nA) are used for medical treatment of tumours at the PROSCAN facility in Paul Scherrer Institut (PSI). A cavity resonator using four quadrants operating in a dipole mode resonance has been developed to measure beam positions at these low intensities. The TM110 resonance frequency of 145.7 MHz is matched to the second harmonic of the beam pulse repetition rate (i.e.72.85 MHz). HFSS (High Frequency Structural Simulator) provides the BPM geometry and important parameters such as pickup position; dielectric dimensions etc. Comparison of test bench measurement and simulation provides good agreement. The measured position and signal sensitivity are limited by the noise, so that a position signal can be derived at beam intensities of at least 10 nA . We will discuss potential methods to increase the sensitivity. The dipole cavity resonator can be a promising candidate as a non-invasive position di-agnostic at the low proton beam intensities used in pro-ton therapy
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About • paper received ※ 14 May 2019       paper accepted ※ 21 May 2019       issue date ※ 21 June 2019  
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