Gyrotron experiments employing a field emission array cathode

M Garven, S N Spark, A W Cross, S J Cooke, A D R Phelps

Research output: Contribution to journalArticlepeer-review

22 Citations (Scopus)
136 Downloads (Pure)


The design and operation of a field emission array (FEA) cathode and the subsequent demonstration of the first FEA gyrotron are presented. Up to 10 mA from 30 000 tips was achieved reproducibly from each of ten chips in a gyrotron environment, namely, a vacuum 1 x 10(-8) mbar, -50 kV potential with multiple chip operation, The design parameters of the FEA gun were similar to those of a magnetron injection gun with an achievable electron beam current of 50-100 mA and measured power 720 W cw. Coherent microwave radiation was detected in both TE(02) at 30.1 GHz and TE(03) at 43.6 GHz, with a starting current of 1 mA.

Original languageEnglish
Pages (from-to)2320-2323
Number of pages4
JournalPhysical Review Letters
Issue number11
Publication statusPublished - 9 Sep 1996


  • vacuum microelectronics
  • field emission array cathode
  • gyrotrons


Dive into the research topics of 'Gyrotron experiments employing a field emission array cathode'. Together they form a unique fingerprint.

Cite this