Measurement of the ionization yield of low energy atomic particles in gases

Date
1955-06-01
Authors
Lowry, Ralph
Miller, Glenn
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Ames Laboratory
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Abstract

The purpose of this investigation was to study the total ionization yield of charged atomic particles in gases for energies in the range of a few to 250 kev. A large cylindrical ionization chamber was used for this study. The charged particles were selected from the kevatron beam by a magnetic and an electrostatic analyzer and entered the chamber by means of a 0.004 inch diameter open window. A differential pumping system permitted pressures up to 10 mm Hg to be maintained in the chamber. The chamber was alternately operated as a proportional counter and an ionization chamber to measure the rate with which the primary items entered the chamber and the ionization produced by them, respectively. A detailed description of the apparatus and measuring technique are given.

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Ames Laboratory
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