Atomic velocity distributions out of hydrogen-maser dissociators. Technical report
Velocity distributions are determined for atoms effusing out of radio frequency discharge hydrogen dissociators, of the type used in hydrogen masers. This work was motivated by long-term reliability issues related to the possible use of masers as freqency standards for satellites. A primary issue is the maser's hydrogen budget, because many of the common failure modes of a maser involve either the hydrogen source or sink. Because the focusing properties of the state-selecting magnets are velocity dependent, the overall hydrogen budget will depend not only on the dissociation efficiency but also on the velocity distribution of the hydrogen atoms leaving the dissociation. Many times, that distribution has been tacitly assumed to be Maxwellian at wall temperature, but pressure in the dissociator increases. Operating the dissociator to yield a matched to that distribution may significantly improve the efficiency hydrogen use by the maser.
- Publication Date:
- OSTI Identifier:
- Report Number(s):
- AD-A-219500/6/XAB; TR--0090(5945-05)-1
- Resource Type:
- Technical Report
- Research Org:
- Aerospace Corp., El Segundo, CA (USA). Chemistry and Physics Lab.
- Country of Publication:
- United States
- 42 ENGINEERING; 74 ATOMIC AND MOLECULAR PHYSICS; ATOMIC CLOCKS; DESIGN; HYDROGEN; DISSOCIATION; MASERS; EFFICIENCY; ATOMS; DISTRIBUTION; FAILURES; PROGRESS REPORT; RADIOWAVE RADIATION; SATELLITES; STANDARDS; USES; VELOCITY; AMPLIFIERS; DOCUMENT TYPES; ELECTROMAGNETIC RADIATION; ELECTRONIC EQUIPMENT; ELEMENTS; EQUIPMENT; MICROWAVE AMPLIFIERS; MICROWAVE EQUIPMENT; NONMETALS; RADIATIONS 426002* -- Engineering-- Lasers & Masers-- (1990-); 640302 -- Atomic, Molecular & Chemical Physics-- Atomic & Molecular Properties & Theory