Yakovlev, V P | Search NASA

DOE OSTI2013

Role of transient processes in resonance line spectroscopy of caesium atoms in cells with antirelaxation coating

We study the peculiarities of the absorption spectra in D{sub 1,2}-lines of Cs, caused by optical pumping in cells with antirelaxation coating. In these cells the internal state of the atom, which arose under optical pumping by a monochromatic laser field, is preserved with a high probability in a collision with the wall. As a result, the optical pumping action extends to the entire volume of the cell and to all the velocities of the atoms. This leads to the speed-dependent scanning distortions of the absorption line profile. The detected features should be considered when using laserpumped quantum magnetometers with antirelaxation-coated cells. (laser spectroscopy)

74 ATOMIC AND MOLECULAR PHYSICS↗

DOE OSTI2012

Multi-harmonic RF test stand for RF breakdown studies

A multi-harmonic RF test stand is under construction at Yale Beam Physics Laboratory. It includes a frequency multiplier which can generate high power harmonics efficiently that are phase locked to the fundamental drive frequency. In a bi-modal asymmetric cavity powered by this RF source, the cavity may experience reduced exposure time to peak fields and sweeping of peak fields across their surfaces, and strong asymmetry between surfaces that may experience cathode-and anode-like fields; these phenomena are to be assessed for their influence on RF breakdown probabilities.

43 PARTICLE ACCELERATORS↗