Abstract
An omegatron, a form of cyclotron, designed for measuring the cyclotron resonance frequency of light positive ions is described. Protons, formed by the collision of electrons and residual gas molecules in the apparatus, are accelerated normal to the axis of two semicylindrical electrodes by an rf electric field. An intense uniform magnetic field, parallel to the electrode axis, causes the protons to follow spiral paths. When the frequency of the electric field is approximately 5 Mc, the magnetic field required is about 4 kgauss, uniform over a volume measuring 2.5 cm diam ×3 cm. From data obtained with this instrument, the student can compute the ratio e/m of the proton. The agreement between this computed value and the accepted modern value for e/m of the proton, is directly dependent upon the accuracy with which frequency and magnetic field strength can be measured.
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