Method for measuring voltage of compact superconductive circular accelerator high frequency resonant cavity

Abstract

The invention discloses a method for measuring voltage of a compact superconductive circular accelerator high frequency resonant cavity. Based on Bremsstrahlung principles, the method specifically comprises the following steps: Bremsstrahlung X rays sent out from detecting points in the accelerator high frequency cavity are propagated to an outer part of an accelerator via a collimating aperture, full energy peak energy spectra of the above rays can be detected via a detector, cavity peak value voltage in the accelerator high frequency cavity is in a certain corresponding relation with maximum energy of the rays, and peak value voltage of the high frequency cavity can be measured based on maximum value of the detected energy spectra of the rays. The method disclosed in the invention is simple and reliable in principles, high in feasibility and strong in operability; the peak value voltage of the high frequency cavity can be accurately obtained; compared with a conventional electronics measurement method, cavity distribution parameters can be prevented from being affected by a plurality of factors, the peak value voltage of the high frequency cavity can be accurately reflected, and physical beam tuning requirements for the accelerator can be satisfied.

Description

technical field [0001] The invention relates to a method for measuring the voltage of a high-frequency resonant cavity by using the principle of bremsstrahlung, in particular to a method for measuring the voltage of a high-frequency resonant cavity of a medical compact superconducting cyclotron. Background technique [0002] Cyclotrons are widely used in the field of nuclear medicine, especially in the fields of radiopharmaceuticals and tumor treatment. The high-frequency resonant cavity of the proton cyclotron is excited by a high-frequency transmitter, and the working peak voltage is 80kV-150kV. Its function is to form a high-frequency electric field in the gap between the cavity electrode and the ground. Whenever the ion beam passes through the gap, it is accelerated by the harmonic force of the electric field force. The energy gain ΔW obtained after acceleration is proportional to the voltage of the cavity. Therefore, the level and stability of the cavity voltage are ...

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Problems solved by technology

[0006] The purpose of the present invention is to provide a method for measuring the voltage of the high-frequency resonant cavity of a compact superconducting cyclotron. problem, it can accurately measure the peak voltage of the DEE board of the high-frequency cavity, and provide a reference for the tuning of the high-frequency cavity; it has the characteristics of simple and reliable principle, high feasibility, and strong operability

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