Free and stored atomic beams as internal polarized targets

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Abstract
The use of a gas target of spin‐polarized hydrogen or deuterium atoms as an internal polarized target for a storage ring is discussed. It is shown that a gas target of polarized atomic hydrogen or deuterium has significant advantages over a conventional polarized target. Production of polarized atomic beams is reviewed and the limitations on target density are device can be built which offers a target thickness of polarized atoms of about 101 2cm− 2 to the circulating beam in routine operation. Work is in progress to increase the available density by producing an atomic beam of reduced average velocity and reduced velocity spread. It is shown that the target density can be increased by injecting the atomic beam into a vessel which has openings for entry and exit of the circulating beam. A volume density of nearly 101 3 cm− 3 may be expected, corresponding to a target thickness of 101 4 cm− 2 if one allows 10 cm target length. The resulting luminosity of 103 0 s− 1 cm− 2 is adequate for many experiments since the relatively open geometry allows detectors covering a large solid angle.

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