# Design of the offline test electronics for the nozzle system of proton therapy

## TL;DR

This paper describes the design of test electronics for proton therapy equipment that can simulate proton beam signals for commissioning without actual beams.

## Contribution

The novel contribution is the development of test electronics that accurately simulate proton beam signals for offline commissioning.

## Key findings

- The test electronics can simulate beam position with an accuracy of ±0.33 mm.
- The system simulates beam fluence with an accuracy of ±1%.
- The electronics can generate analog signals for environmental parameters.

## Abstract

A set of nozzle equipment for proton therapy is currently under development at China Institute of Atomic Energy (CIAE). To facilitate the off-line commissioning of the whole equipment, a set of ionization chamber signal generation system, known as the test electronics, was designed. The results showed that the system can simulate the beam position, beam fluence (which exhibits a positive correlation with the dose), and other related analog signals generated by the proton beam when it traverses the ionization chamber. Moreover, the accuracy of the simulated beam position is within ± 0.33 mm, and the accuracy of the simulated beam fluence signal is within ± 1%. The test electronics can output analog signals representing environmental parameters. The test electronics meets the design requirements, which can be used for the commissioning of the nozzle system as well as the treatment control system without the presence of the proton beam.