Title :
Cryogenic hydrogen maser
Author :
Mossavati, R. ; Gallop, J.C. ; Wall, C.F.
Author_Institution :
Center for Basic Metrol., Nat. Phys. Lab., Teddington, UK
fDate :
June 27 1994-July 1 1994
Abstract :
We have begun to develop a prototype cold hydrogen maser (CHM). The main features of this CHM, which is designed to operate in the pulsed mode at 4.2 K, is the use of low loss alumina for the fabrication of the microwave cavity in order to reduce the overall size. A numerical simulation was performed to find the dimensions of the microwave cavity required for the TE/sub 011/ mode to be at 1.420 GHz, and the model has been confirmed experimentally. The CHM is intended to be used as a flywheel frequency standard at the NPL with medium-term stability of one part in 10/sup 16/ or better.<>
Keywords :
cavity resonators; digital simulation; frequency measurement; hydrogen; low-temperature techniques; masers; measurement standards; physics computing; 1.420 GHz; 4.2 K; H; NPL; TE/sub 011/ mode; cryogenic hydrogen maser; flywheel frequency standard; low loss alumina; medium-term stability; microwave cavity; numerical simulation; shielding; Cryogenics; Fabrication; Flywheels; Frequency; Hydrogen; Masers; Numerical simulation; Prototypes; Stability; Tellurium;
Conference_Titel :
Precision Electromagnetic Measurements, 1994. Digest., 1994 Conference on
Conference_Location :
Boulder, CO, USA
Print_ISBN :
0-7803-1984-2
DOI :
10.1109/CPEM.1994.333229
