Effect of Thermohydrogen Treatment on the Structure and Properties of Titanium Alloy Castings

Metal Science and Heat Treatment -     

Hydrogen maser as a quantum frequency standard

Conclusions The main factors limiting the frequency stability of a hydrogen maser over long periods are magnetic field drift, error in the compensation setting, and inconstancy in bulb temperature. Future researches will be directed to raising the long term stability with continuous operation. We have developed a hydrogen maser with automatic magnetic field stabilization, with an improved frequency modulator that introduces very little Q change, and with a thermostatic cavity. In six months of preliminary tests the systematic frequency drift has been zero from day to day within 10^–13. Atomic clocks of this type may be recommended as working time reference standards.Translated from Izmeritel'naya Tekhnika, No. 11, pp. 29–32, November, 1972.