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High frequency cavity radio frequency breakdown protection device

A technology of breakdown protection and high-frequency cavity, which is applied in the field of nuclear technology and electronic information, can solve the problems of reducing the average beam current intensity and affecting the operation effect of the accelerator, and achieves the effect of compact structure, low price and protection of the accelerator

Active Publication Date: 2018-03-20
四川玖谊源粒子科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For PET cyclotrons, which require high average beam current intensity, such an approach will reduce the average beam current intensity and affect the operation effect of the accelerator.

Method used

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  • High frequency cavity radio frequency breakdown protection device
  • High frequency cavity radio frequency breakdown protection device
  • High frequency cavity radio frequency breakdown protection device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] like Figure 1-3 As shown, the present invention includes an analog comparator, a two-way detection sample-and-hold circuit, a linear amplifier and a waveform discrimination unit, and the two-way detection sample-and-hold circuit includes a detection sample-and-hold circuit A and a detection sample-and-hold circuit B, wherein the detection sample-and-hold circuit The input terminal of the circuit A is connected to the incident signal terminal, the output terminal of the detection sampling and holding circuit A is connected to the linear amplifier, the output terminal of the linear amplifier is connected to the inverting input terminal of the analog comparator, and the input terminal of the detection sampling and holding circuit B is connected to the reflected signal terminal , the output end of the detection sample-and-hold circuit B is connected to the same input end of the analog comparator; the output end of the analog comparator is connected to the waveform discrimin...

Embodiment 2

[0021] This embodiment is preferably as follows on the basis of Embodiment 1: the radio frequency breakdown protection unit includes a counter, a self-locking timer A for counting time, a self-locking timer B for delay time and a digital comparator, the counter and the trigger terminal of the self-locking timer A are connected to the output signal of the analog comparator, the reset terminal of the self-locking timer A, the timing completion terminal of the self-locking timer A and the clearing terminal of the counter are connected at the same time; The counting output terminal of the counter is connected to the same input terminal of the digital comparator, the output terminal of the digital comparator is connected to the trigger terminal of the self-locking timer B, and the timing completion terminal of the self-locking timer B is connected to the reset terminal of the self-locking timer B. The self-locking timer B is also provided with a protection signal output terminal, an...

Embodiment 3

[0024] This embodiment is preferably as follows on the basis of any one of the above-mentioned embodiments: the radio frequency breakdown type identification unit is a digital signal processor, and the digital signal processor is provided with an incident signal envelope input terminal, an analog comparator output signal receiving terminal, and a clock signal input terminal. Terminal, pulse sequence number output terminal and analog comparator output signal pulse width terminal.

[0025] Both the incident signal end and the reflected signal end are connected to the power transmission line at the front end of the high frequency cavity of the accelerator. The digital signal processor analyzes and processes the incident signal and the output signal of the comparator to obtain the sequence number of the pulse (how many pulses) and the moment when the radio frequency breakdown occurs in the pulse when the radio frequency breakdown occurs. The radio frequency breakdown type identifi...

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Abstract

The invention discloses a high-frequency cavity radio-frequency breakdown protection device comprising an analog comparator, two detecting, sampling and holding circuits, a linear amplifier, and a waveform identification unit. The two detecting, sampling and holding circuits are respectively a detecting, sampling and holding circuit A and a detecting, sampling and holding circuit B, wherein the input end of the detecting, sampling and holding circuit A is connected with an incident signal end, the output end of the detecting, sampling and holding circuit A is connected with the linear amplifier, the output end of the linear amplifier is connected with the inverse-phase input end of the analog comparator, the input end of the detecting, sampling and holding circuit B is connected with a reflected signal end, and the output end of the detecting, sampling and holding circuit B is connected with the in-phase input end of the analog comparator. The output end of the analog comparator is connected with the waveform identification unit. The waveform identification unit includes a radio-frequency breakdown type identification unit and a radio-frequency breakdown protection unit. Based on the principle, high-frequency cavity radio-frequency breakdown signals can be collected and analyzed, the number of times of high-frequency cavity radio-frequency breakdown can be controlled, and reduction of average beam current intensity is avoided.

Description

technical field [0001] The invention relates to the fields of nuclear technology and electronic information, in particular to a radio frequency breakdown protection device for a high frequency cavity. Background technique [0002] During the operation of the accelerator's high-frequency cavity, radio frequency breakdown often occurs, which is manifested by a sudden drop in the peak value of the electromagnetic field inside the high-frequency cavity, an increase in the reflected signal, and accompanied by internal luminescence in the cavity. If the radio frequency breakdown occurs repeatedly, it may cause irreversible damage to the high frequency cavity and reduce the electric field tolerance of the surface of the high frequency cavity. For radio frequency breakdown, the usual method is shutdown recovery, that is, wait for a certain period of time and then reduce the input power, and then slowly increase the input power to the normal operating level. For the PET cyclotron, w...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H03K5/22H03K5/125
Inventor 何小中庞健赵良超马超凡
Owner 四川玖谊源粒子科技有限公司
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