The FILTEX/HERMES polarized hydrogen atomic beam source

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Abstract

The FILTEX/HERMES atomic beam source (ABS) for polarized hydrogen is described. Recent improvements concern mainly the optimization of the beam forming system and a new design of the sextupole magnet system. For a precise measurement (error 5%) of the output flow a calibrated compression tube was installed. The output flow of 0.81×1017 H atoms per second in two hyperfine substates was constant within 2% in a long-term measurement over 16 h. At the FILTEX test experiment, the target density in the storage cell fed by the ABS was constant within the experimental error of 4% over a period of four months.

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    Supported partly under various contracts by the Bundesministerium für Forschung und Technologie, Bonn.

    1

    Permanent address: Institute for Nuclear Physics, 630090 Novisibirsk, Russia.

    2

    Now at DESY, D 22603 Hamburg, Germany.

    3

    Now at California Institute of Technology, Pasadena, CA 91125, USA.

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