Nuclear Science and Techniques ›› 2019, Vol. 42 ›› Issue (3): 30203-030203.doi: 10.11889/j.0253-3219.2019.hjs.42.030203

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Analysis of the over-loaded reflection of solid state power amplifier module

Kean JIN1,2,Liepeng SUN1(),Longbo SHI1,Zheng GAO1,Zhenglong ZHU1,Zongheng XUE1,Jinying MA1,2,Fanjian ZENG1,Qi CHEN1,2,Zheng GONG1,2,Shenghu ZHANG1   

  1. 1. HUANG Guirong1 HE Yuan1
    2. Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, China
  • Received:2018-12-19 Revised:2019-01-17 Online:2019-03-10 Published:2019-03-14
  • Contact: Liepeng SUN E-mail:sunlp@impcas.ac.cn
  • About author:<named-content content-type="corresp-name">JIN Kean</named-content>, male, born in 1993, graduated from Beijing University of Chemical Technology in 2016, master student, major in nuclear energy and nuclear technology engineering|<named-content content-type="corresp-name">JIN Kean</named-content>, male, born in 1993, graduated from Beijing University of Chemical Technology in 2016, master student, major in nuclear energy and nuclear technology engineering|SUN Liepeng, E-mail:<email>sunlp@impcas.ac.cn</email>
  • Supported by:
    Supported by National Natural Science Foundation of China(No.91426303);Supported by National Natural Science Foundation of China (No.91426303)

Abstract: Background

C-ADS (Chinese Accelerator Driven Sub-critical System) injector II superconducting linac uses solid state amplifier (SSA) to drive normal temperature acceleration structure and superconducting cavity. During operation, some power amplifier modules of SSA were damaged due to overload of reflected power.

Purpose

This study aims to analyze the reasons that caused over loading of SSA.

Methods

The relationship between the distribution of reflected power among the amplifier modules, the S parameters of power combination network, and various output states of amplifier module is derived and analyzed.

Results

The results showed that the failure of amplifier module would cause the unbalanced of reflected power distribution among modules. Some modules would undertake the reflection above normal level.

Conclusions

For the SSA with one-stage combined net, only failure module probably undertakes over loading reflected power; for the SSA of the multi-stage combined net, any module in the combined branch where the faulty module was located may have an overload reflection.

Key words: SSA, Power combining net, S parameter, Reflection power

CLC Number: 

  • TN957