Title :
Amplifier operation of the NRL ubitron
Author :
Jackson, R.H. ; Pershing, D.E. ; Bluem, H.
Author_Institution :
US Naval Res. Lab., Washington, DC, USA
Abstract :
The operation of a ubitron/FEL amplifier is reported. The experiment has been operated using the fundamental wiggler harmonic interaction with the TE/sub 11/ circular waveguide mode. Small-signal gains as high as 12 dB have been observed at a voltage 15% below design level with a minimum instantaneous bandwidth exceeding 25%. A gain per free-space wavelength approaching 0.9 dB/ lambda has been achieved. Experimental results are compared with small-signal calculations, and future plans are discussed. Reasonable agreement has been obtained between measurements and theory concerning gain, bandwidth, and general performance characteristics. In particular, higher values of gain per free-space wavelength have been achieved due to the combination of helical wiggler and circularly polarized waveguide mode.<>
Keywords :
free electron lasers; microwave amplifiers; microwave tubes; 12 dB; FEL amplifiers; Naval Research Laboratories; TE/sub 11/ circular waveguide mode; characteristics; circularly polarized waveguide mode; fundamental wiggler harmonic interaction; future plans; gain; gain per free-space wavelength; helical wiggler; instantaneous bandwidth; microwave tubes; operation; small signal gain; small-signal calculations; ubitron; Bandwidth; Gain measurement; Operational amplifiers; Performance gain; Polarization; Tellurium; Undulators; Voltage; Waveguide components; Wavelength measurement;
Conference_Titel :
Electron Devices Meeting, 1988. IEDM '88. Technical Digest., International
Conference_Location :
San Francisco, CA, USA
DOI :
10.1109/IEDM.1988.32873
