Title :
Recent investigations with the Harvard-Smithsonian cryogenic hydrogen maser
Author :
Walsworth, R.L. ; Mattison, E.M. ; Vessot, R.F.C. ; Silvera, I.F.
Author_Institution :
Harvard-Smithsonian Center for Astrophys., Cambridge, MA, USA
Abstract :
A hydrogen maser that operates near 0.5 K using a high-cooling-power 3He refrigerator is discussed. This cryogenic hydrogen maser is used to study low temperature atomic hydrogen spin-exchange collisions and hydrogen-helium interactions, and to investigate the performance of cryogenic hydrogen masers as possibly improved frequency standards. Recent measurements on these topics are reported
Keywords :
atomic clocks; cryogenics; frequency measurement; masers; measurement standards; 0.5 K; H-He interactions; Harvard-Smithsonian cryogenic H maser; cryogenic H spin exchange collisions; frequency standards; high-cooling-power 3He refrigerator; Atomic measurements; Cryogenics; Frequency measurement; Helium; Hydrogen; Laboratories; Masers; Refrigeration; Stability; Temperature;
Conference_Titel :
Frequency Control Symposium, 1993. 47th., Proceedings of the 1993 IEEE International
Conference_Location :
Salt Lake City, UT
Print_ISBN :
0-7803-0905-7
DOI :
10.1109/FREQ.1993.367387
