Superconductive cavity tuning control system and method based on PLC and touch screen

Abstract

The invention discloses a superconductive cavity tuning control system and method based on a PLC and a touch screen. The system comprises a PLC substrate. A PLC power module, a CPU module, a position control module, a first simulation input module, a second simulation input module, a simulation output module and a TTL input module are arranged on the PLC substrate. An incident power radio frequency signal lead out end of a superconductive cavity and a radio frequency signal lead out end coupled in the superconductive cavity are connected with two input ends of a phase discriminator. The output end of the phase discriminator is connected with the first simulation input module and the input end of the TTL input module. The second simulation input module and the output end of a displacement sensor are connected with a simulation voltage input end of a piezoelectric ceramic high-voltage power supply. The position control module is connected with a pulse input end of the stepper motor driver. The simulation output module is connected with a simulation input end of the piezoelectric ceramic high-voltage power supply. The CPU module is connected with the touch screen unit. According to the invention, frequency of the superconductive cavity can be automatically searched, captured and locked.

Description

technical field [0001] The invention relates to a superconducting cavity tuning control system and method based on a PLC and a touch screen, and belongs to the technical fields of particle accelerators and low-temperature superconductivity. Background technique [0002] In order to continuously accelerate the beam passing through the superconducting cavity, it is necessary to lock the resonant frequency of the superconducting cavity at the working frequency, and each cavity must be equipped with a set of tuners and tuning control systems that can continuously adjust the cavity frequency. Only in this way can high-frequency power be fed into the superconducting cavity to accelerate the beam. Among them, the main purpose of the tuning control system is to compensate or damp the frequency change of the superconducting cavity caused by factors such as helium pressure fluctuations, beam load effects, Lorentz detuning and microphone effects during the operation of the superconduct...

AI Technical Summary

Problems solved by technology

[0008] (3) Stepper motor variable speed area: only the stepper motor controller generates pulse signals to drive the motor to rotate, and the motor rotation speed (unit: Hz) is proportional to the absolute value of the phase difference. At this time, there is only a certain Bias high voltage, no ability to adjust cavity frequency;

[0012] 1. Disadvantages of analog electronic technology

[0013] (1) For complex analog circuits, once the design and processing are completed, if there is a need to change the device or add functions, it needs to be reprocessed, which takes a long time and costs a lot;

[0014] (2) The wiring of analog devices is complicated, it is not easy to debug, and requires rich debugging experience and long debugging time;

[0015] (3) Analog devices cannot execute more complex algorithms, and the control precision is low;

[0016] (4) Poor anti-interference ability, susceptible to noise interference

[0017] 2. Disadvantages of DSP and FPGA technology

[0018] (1) The cost is high. For the same tuning control system, the cost is several times that of the PLC controller;

[0019] (2) In order to save the development cycle, generally all DSP and FPGA chip companies have basic boards, but the boards have fewer input and output ports, which are not suitable for the control of multiple tuners

[0020] (3) The tuning control system is characterized by the need for multi-axis stepper motor control and multiple digital-to-analog converters (DACs) for piezoelectric ceramic control, requiring a single resource and a large number of the same interface, while DSP There are abundant supporting resources with FPGA boards, but the quantity is small, which will cause waste of resources

[0021] In addition, the communication between analog electronic devices, DSP and FPGA boards and the user interface requires the use of bus design and a more complex input and output controller IOC (Input / Output Controller) to achieve complex communication and anti-interference capabilities Difference

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