Abstract
ABSTRACT There is current interest within the Navy to develop high average power gyroklystron amplifiers to generate millimeter wave electromagnetic radiation for enhanced performance W‐band (94 GHz) radar applications. These applications include high resolution imaging, precision tracking, and cloud physics studies. Notwithstanding the relatively high atmospheric absorption in the high frequency millimeter wave bands, the development of radars in these frequency bands can solve many pressing problems, provided sufficient power levels can be obtained. Gyroklystron amplifiers are vacuum electronic amplifiers which are capable of providing more than an order of magnitude increase in power over conventional coupled‐cavity TWTs in these bands. One current frequency of interest is in the 94 GHz range which requires an external magnetic field of ˜3.4 Tesla in order for the gyroklystron to operate. The most efficient means for generating this magnetic field level is through the use of superconducting magnets. With the continued development of high temperature superconductors (HTS) and a corresponding progress in cryo‐cooler technology, it is now possible to consider utilizing cryo‐cooled HTS in this application. Operating in the 10 K to 25 K range with a cryo‐cooler, we are currently developing a prototype cryogen free HTS magnet system for this radar application.
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