Physics of the Hydrogen Maser

摘要: Publisher Summary The hydrogen maser is a very powerful spectrometer for examining frequency deviations or level variations arising in the interaction of atoms with fields atomic particles introduced into bulb. pressure source regulated by means servo system acting upon hydrogen-leak rate through its temperature. Before entering microwave active region, must be separated according to their energy states. This generally realized hexapole magnets that produce high-beam intensity given emittance because focusing properties. state-selected are storage bulb and stored there about 1 s central region resonant cavity. Magnetic shields reduce earth's magnetic field fluctuations region. Several layers mu-metal most commonly used, providing residual as low few microgauss tenths microgauss.