Accession Number : ADD014348

Title :   Electron Paramagnetic Resonance Instrument with Superconductive Cavity.

Descriptive Note : Patent Application, Filed 16 Nov 89,

Corporate Author : DEPARTMENT OF THE ARMY WASHINGTON DC

Personal Author(s) : Jasper, Louis J , Jr

Report Date : 16 Nov 1989

Pagination or Media Count : 16

Abstract : The EPR instrument includes an X band klystron used to generate microwave power that is transmitted to a superconductive waveguide cavity resonator. The cavity is placed between the pole pieces of a large d-c magnet and small a-c magnetic coils energized by a modulation signal source. A microwave crystal detector detects RF energy outputted from the cavity. The detector output is amplified, rectified and filtered in a phase sensitive filter that uses the modulation signal source as a reference. The resultant signal is recorded by an amplitude vs. time recorder. The superconductive cavity includes an inner wall of high-temperature superconductive material, a liquid coolant and an insulating sleeve that passes through the cavity. The specimen to be analyzed is placed in the sleeve. Patents application. (JHD)

Descriptors :   *ELECTRON PARAMAGNETIC RESONANCE, *PATENT APPLICATIONS, ALTERNATING CURRENT, CAVITIES, CAVITY RESONATORS, CRYSTALS, DIRECT CURRENT, RADIOFREQUENCY FILTERS, HIGH TEMPERATURE, INSULATION, KLYSTRONS, LIQUID COOLING, MAGNET COILS, MAGNETS, MATERIALS, MICROWAVE EQUIPMENT, MICROWAVES, MODULATION, RADIOFREQUENCY POWER, RECORDING SYSTEMS, SENSITIVITY, SIGNALS, SLEEVES, SOURCES, SUPERCONDUCTORS, TIME SIGNALS, WAVEGUIDES, X BAND

Subject Categories : Test Facilities, Equipment and Methods

Distribution Statement : APPROVED FOR PUBLIC RELEASE