Phase locking and frequency locking of a 140 GHz klystron and a 280 GHz carcinotron

Journal Article · Thu Oct 01 00:00:00 EDT 1992 · Review of Scientific Instruments; (United States)

DOI:https://doi.org/10.1063/1.1143609· OSTI ID:7009327

Sprehn, D W; Rettig, C L; Luhmann, Jr, N C ^[1]

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1. Electrical Engineering Department, University of California, Los Angeles, California 90024-1594 (United States)

A phase and frequency-locked loop to synchronize two microwave tube oscillators for a high density plasma collective scattering diagnostic has been designed, assembled, and tested. A Varian (VRT2121A16) reflex klystron was down converted by mixing with the eighth harmonic of a 17.437 GHz phase-locked Gunn oscillator, and the resulting baseband was used to lock the klystron phase to a 200 MHz crystal. The down-converted 140 GHz klystron frequency spectrum shows a linewidth {lt}50 Hz and sideband power {lt}50 dB below the carrier (dBc). Frequency locking of a Thomson CSF TH4224S 280 GHz carcinotron was performed and the klystron was then down converted by the stabilized carcinotron and phase locked to the 200 MHz crystal. The klystron would track the frequency excursions of the carcinotron when the system was perturbed by direct modulation with frequencies of up to 10 MHz and remained locked as long as modulation sidebands were kept {lt}15 dBc. The locked states of both configurations show 3 to 4 orders of magnitude improvement in short and long term stability over the unlocked states.

• DOE Contract Number: FG03-86ER53225
• OSTI ID: 7009327
• Journal Information: Review of Scientific Instruments; (United States), Journal Name: Review of Scientific Instruments; (United States) Vol. 63:10; ISSN RSINA; ISSN 0034-6748
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
700320* -- Plasma Diagnostic Techniques & Instrumentation-- (1992-)
CLOSED PLASMA DEVICES
CONTROL
ELECTRON TUBES
ELECTRONIC EQUIPMENT
EQUIPMENT
FREQUENCY CONTROL
FREQUENCY RANGE
GHZ RANGE
GHZ RANGE 100-1000
KLYSTRONS
MICROWAVE EQUIPMENT
MICROWAVE TUBES
PLASMA DIAGNOSTICS
THERMONUCLEAR DEVICES
TOKAMAK DEVICES