Conduction Cooling of a Traveling Wave Maser Superconducting Magnet in a Closed-Cycle Refrigerator
A major advance in microwave receiver technology was the development of the traveling wave maser (TWM) . However, in spite of its unique low noise characteristics, this device presented formidable obstacles to practical usage due to the unusual magnetic and thermal environment that is necessary for its operation. The required magnetic field (2 to 3 kG) must be uniform to one part in a thousand and directed perpendicular to the length of the maser crystal. The crystal, typically 6 in. long, must be maintained at temperatures near absolute zero. Thus, a typical TWM installation in the laboratory includes a massive electromagnet to provide this intense, uniform field over the large gap which accommodates a double-dewar liquid-helium reservoir.
KeywordsFringe Field Hall Probe Conduction Cool Copper Plating Massive Electromagnet
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