DESIGN OF A MOLECULAR AMPLIFIER GROUP
Abstract
A traveling-wave maser (TWM) using a ruby crystal in a 1-7/8 inch long slow-wave comb structure was operated successfully. Operation is most efficient when the external magnetic field is oriented at an angle of 90 degrees with respect to the C-axis. A 0-degree C-axis crystal was used instead of the standard 60-degree C- axis crystal. This resulted in a considerable improvement in gain for the rf circuit geometry used. The final breadboard maser configuration yielded an average electronic gain of approximately 5 db per inch from 2150 to 2350 mc at a bath temperature of 1.8 K. Unidirectional loss was successfully incorporated in the maser by using polycrystalline yttrium iron arnet (YIG) disks. The t/d ratio required for coincidence of the d-c magnetic fields for ferrimagnetic resonance and for maser action was determined. Isolator reverse loss varies from 4.0 db/in. at the low-frequency end of the band to 8.5 db/in. at the high-frequency end. The figure of merit for the isolator is about 20. 9author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Jun 01, 1960
- Accession Number
- AD0255148
Entities
People
- F. Arams
- J.g. Smith
- S. Okwit