Theoretical and experimental research on a high efficiency X-band klystron-like RBWO

Theoretical and experimental research on a high efficiency X-band klystron-like RBWO

In this paper, we study an X-band klystron-like relativistic backward wave oscillator (RBWO) with a pre-modulation cavity, modulation ridge, drift tube in the slow wave structure (SWS) and extraction cavity in both theoretical and experiment. PIC simulations show that the conversion efficiency can b...

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Main Authors: Dewen Yang, Yanchao Shi, Renzhen Xiao, Yan Teng, Jun Sun, Changhua Chen
Format: Article
Language:English
Published: AIP Publishing LLC 2018-09-01
Series:AIP Advances
Online Access:http://dx.doi.org/10.1063/1.5040075
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spelling doaj-8abe9a9fc70b4e98adbb4f14c51e06d62020-11-25T02:30:07ZengAIP Publishing LLCAIP Advances2158-32262018-09-0189095229095229-1010.1063/1.5040075088808ADVTheoretical and experimental research on a high efficiency X-band klystron-like RBWODewen Yang0Yanchao Shi1Renzhen Xiao2Yan Teng3Jun Sun4Changhua Chen5Science and Technology on High Power Microwave Laboratory, Northwest Institute of Nuclear Technology, Xi’an 710024, ChinaScience and Technology on High Power Microwave Laboratory, Northwest Institute of Nuclear Technology, Xi’an 710024, ChinaScience and Technology on High Power Microwave Laboratory, Northwest Institute of Nuclear Technology, Xi’an 710024, ChinaScience and Technology on High Power Microwave Laboratory, Northwest Institute of Nuclear Technology, Xi’an 710024, ChinaScience and Technology on High Power Microwave Laboratory, Northwest Institute of Nuclear Technology, Xi’an 710024, ChinaScience and Technology on High Power Microwave Laboratory, Northwest Institute of Nuclear Technology, Xi’an 710024, ChinaIn this paper, we study an X-band klystron-like relativistic backward wave oscillator (RBWO) with a pre-modulation cavity, modulation ridge, drift tube in the slow wave structure (SWS) and extraction cavity in both theoretical and experiment. PIC simulations show that the conversion efficiency can be up to 62% with output power of 3.0 GW. In experiment, when the diode voltage is 660 kV, and the diode current is 6.4 kA, the output power is 1.9 GW, and the conversion efficiency is 45%(±5%). And we find that the conversion efficiency mainly suffers from the breakdown in the extraction cavity and the plasma from the cylindrical collector. To suppress the breakdown and plasma effect, the breakdown electric field threshold in RF structures(especially in the extraction cavity) had better be larger than 700 kV/cm. Moreover, the distance between the position where the electrons are collected and the end of extraction cavity should be larger than 20 mm in case of the cylindrical collector.http://dx.doi.org/10.1063/1.5040075
collection DOAJ
language English
format Article
sources DOAJ
author Dewen Yang
Yanchao Shi
Renzhen Xiao
Yan Teng
Jun Sun
Changhua Chen
spellingShingle Dewen Yang
Yanchao Shi
Renzhen Xiao
Yan Teng
Jun Sun
Changhua Chen
Theoretical and experimental research on a high efficiency X-band klystron-like RBWO
AIP Advances
author_facet Dewen Yang
Yanchao Shi
Renzhen Xiao
Yan Teng
Jun Sun
Changhua Chen
author_sort Dewen Yang
title Theoretical and experimental research on a high efficiency X-band klystron-like RBWO
title_short Theoretical and experimental research on a high efficiency X-band klystron-like RBWO
title_full Theoretical and experimental research on a high efficiency X-band klystron-like RBWO
title_fullStr Theoretical and experimental research on a high efficiency X-band klystron-like RBWO
title_full_unstemmed Theoretical and experimental research on a high efficiency X-band klystron-like RBWO
title_sort theoretical and experimental research on a high efficiency x-band klystron-like rbwo
publisher AIP Publishing LLC
series AIP Advances
issn 2158-3226
publishDate 2018-09-01
description In this paper, we study an X-band klystron-like relativistic backward wave oscillator (RBWO) with a pre-modulation cavity, modulation ridge, drift tube in the slow wave structure (SWS) and extraction cavity in both theoretical and experiment. PIC simulations show that the conversion efficiency can be up to 62% with output power of 3.0 GW. In experiment, when the diode voltage is 660 kV, and the diode current is 6.4 kA, the output power is 1.9 GW, and the conversion efficiency is 45%(±5%). And we find that the conversion efficiency mainly suffers from the breakdown in the extraction cavity and the plasma from the cylindrical collector. To suppress the breakdown and plasma effect, the breakdown electric field threshold in RF structures(especially in the extraction cavity) had better be larger than 700 kV/cm. Moreover, the distance between the position where the electrons are collected and the end of extraction cavity should be larger than 20 mm in case of the cylindrical collector.
url http://dx.doi.org/10.1063/1.5040075
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AT renzhenxiao theoreticalandexperimentalresearchonahighefficiencyxbandklystronlikerbwo
AT yanteng theoreticalandexperimentalresearchonahighefficiencyxbandklystronlikerbwo
AT junsun theoreticalandexperimentalresearchonahighefficiencyxbandklystronlikerbwo
AT changhuachen theoreticalandexperimentalresearchonahighefficiencyxbandklystronlikerbwo
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