PERFORMANCE INVESTIGATION FOR NANOCARBON MODIFIED DISPENSER CATHODE

• Published in: Известия высших учебных заведений России: Радиоэлектроника
• Main Authors: T. M. Krachkovskaya, A. V. Storublev, G. V. Sakhadji, A. N. Emelyanov
• Format: Article
• Language: Russian
• Published: Saint Petersburg Electrotechnical University "LETI" 2018-08-01
• Subjects: nanocarbon; dispenser cathode; astralen®; ugleron®; emission; durability
• Online Access: https://re.eltech.ru/jour/article/view/249

The article provides  characteristics of dispenser cathodes with admixture of nanocarbon particles,  i.e. sulfoadduct of carbon  nanoclusters (Ugleron®), into active material and polyhedral multilayer carbon  nanostructures of the fulleroid  type  and  toroidal  shape  (Astralenes®)  into  tungsten matrix.  The emitters are  considered as  electron  sources  for modern microwave devices,  in particular  travelling wave tube.  The results  of their accelerated life tests.  Emission  capacity measurement results  are provided. A comparative x-ray analysis  of modified and  typical cathode emitting  surfaces  and  respective  anodes is presented. The morphology features of DC metal  matrix  with  admixture of carbon  nanoparticles are mentioned. Moreover,  resistance of nanocarbon modified cathodes to operation under  insufficient vacuum  conditions is investigated.It is concluded that  the further  study  of nanocarbon modi-fied thermal cathode parameters, e.g. electron  work function and  active substance evaporation rate with Ugleron®, is reasonable. Recommendations on further  improvement of dispenser cathodes manufacturing technology with admixture of nanocarbonic particles.