Source of polarized ions for a tandem accelerator

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Abstract

A source of polarized negative hydrogen ions for a tandem accelerator is described. It consists of a conventional source of polarized protons or deuterons producing a beam of 0.15 μA. Negative ions are formed by charge exchange in a thin carbon foil. Under suitable conditions the beam can be accelerated without depolarization. The polarization of the proton beam after acceleration is 47%. The beam intensity passing through a 0.3 cm diameter aperture into a target chamber is 108 particles per second.

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    Work supported in part by the U.S. Atomic Energy Commission.

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    Now at Department of Physics, ETH, Zürich, Switzerland.

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