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Polarized electrons from penning ionization in a flowing helium afterglow
An experimental apparatus is described which provides a spatial decay of the excited species from a helium discharge. This "flowing afterglow" has been constructed and the helium metastable atoms He(23S1) are seen to decay ...
3.4 centimeter cyrogenic parametric amplifier system for radio astronomy
A low-noise microwave receiver was designed and fabricated to provide the necessary sensitivity to detect the helium 3 line. In order to achieve ultra-low noise amplification in the input states of this receiver, cascaded ...