Controllable multi-channel charge reader

Abstract

The invention relates to the technical field of multi-channel charge front-end reading circuits for beam monitoring, in particular to a controllable multi-channel charge reader. The controllable multi-channel charge reader is characterized by comprising a speed-sensitive switch, integrators with a releasing function, a multiplexer, a control logic circuit, a differential output driving circuit and a data acquisition card which are connected in sequence, the charge reader is used for reading charge (current) signals of a beam monitoring stripping ionization chamber, the measuring range is controllable, the integration duration is controllable, the working mode (continuous reading / intermittent reading) is controllable, and using is flexible; each channel contains two integrators (A and B), the two integrators can work in a time-sharing mode, and then signal processing efficiency is improved; due to the fact that a multiplexing circuit is adopted for serial output of signals, the complexity of data acquisition and the manufacturing cost of a processing system can be effectively reduced, and the accuracy of a heavy ion cancer treatment system is improved. The circuit is high in accuracy, linearity and flexibility and simple in structure.

Description

technical field [0001] The invention relates to the technical field of a multi-channel charge front-end readout circuit for beam current monitoring, in particular to a controllable multi-channel charge readout device. Background technique [0002] With the continuous development of heavy ion cancer treatment technology, in order to achieve better therapeutic effects, the treatment terminal has higher and higher requirements for beam quality. In the heavy ion cancer treatment device, the real-time monitoring and measurement of the spatial distribution of the beam is one of the key parts of the device. The beam of the heavy ion cancer treatment device outputs multi-channel weak charge (current) signals through the striped ionization chamber at the treatment terminal, and then through the multi-channel charge (current) readout circuit to realize real-time monitoring of the spatial distribution of the beam. Under normal circumstances, the charge (current) signal output by the s...

AI Technical Summary

Problems solved by technology

Under normal circumstances, the charge (current) signal output by the striped ionization chamber used for beam current monitoring in the cancer treatment terminal is relatively small, and the number of channels is large. Using the current-voltage real-time conversion circuit of the prior art will result in a large amount of data. The requirements for real-time transmission and processing of data in the latter stage are relatively high, which leads to quite expensive manufacturing costs. Secondly, environmental noise also greatly interferes with the circuit, which affects the accuracy of beam current monitoring.

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