›› 2017, Vol. 37 ›› Issue (2): 103-107.doi: 10.16708/j.cnki.1000-758X.2017.0035

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Studyonlife-testofM-typeimpregnatedcathodeforspaceTWT

 SHAO  Wen-Sheng*, LI  Ji, YU  Zhi-Qiang, CHENG  Cheng, ZHANG  Ke, WANG  Hui, WANG  Li-Shan   

  1. BeijingVacuumElectronicsResearchInstitute,Beijing100015,China
  • Received:2016-08-31 Revised:2017-01-18 Online:2017-04-25 Published:2017-03-17

Abstract: Spacetravellingwavetube(STWT)withlonglifeplaysanimportantroleonthepoweramplifierforsatellitecommunicationsystem.ThelifeoftheSTWTismainlyrestrictedbythecathodelife.InordertoensurethattheSTWTcanhavealonginorbitoperatingtime,itisnecessarytocarryoutplentyexperimentalresearchesonthelifeofSTWTcathode,andtopredictthelifeoftheSTWTcathode.Theaccumulatinglifetesttimeis1823080hoursfor50electronguns,thelongestlifetesttimeisover65411hours.Thelifepredictionmodelwasbuiltonthebasisofthechangeoftheworkfunctionduringthelifetime.Thepredictinglifeismorethan43yearswhenthecathodeisdrawnacurrentdensityof1A/cm2at960℃b (℃b: brightnesstemperature),itismorethan22yearsat980℃b,  anditismorethan15yearsat1000℃b.ThepredictinglifeshowsthatthelonglifeSTWTcathodecanmeettherequirementsofthesatellitecommunicationsystem.

Key words: spaceTWT, cathode, workfunction;emissioncurrentdensity, lifetest, lifepredictionmodel