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首页> 外文期刊>Nuclear instruments and methods in physics research >Positron remoderation by gas cooling within an electric drift field
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Positron remoderation by gas cooling within an electric drift field

机译：在电漂移场中通过气体冷却进行正电子减速

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摘要

A variety of low energy positron experiments need an improved brilliance of the beam by means of a remoderator. Conventionally, a tungsten foil or single crystal is used as a remoderator in transmission or reflection geometry. We have developed a novel remoderation unit that is based on inelastic positron scattering and a focusing drift motion of the slowed-down positrons in nitrogen gas. In first measurements at the intense slow positron beam NEPOMUC at the FRM II we succeeded in detecting moderated positrons at the exit of the remoderator stage. The losses were monitored by detection of the annihilation radiation. Possible improvements and applications of the method are discussed.
机译：各种低能正电子实验都需要借助调节器来提高光束的亮度。常规地，钨箔或单晶被用作透射或反射几何形状中的减慢剂。我们已经开发了一种新型的减速单元，该单元基于非弹性正电子散射和氮气中减速的正电子的聚焦漂移运动。在FRM II上的强慢正电子束NEPOMUC的首次测量中，我们成功地在了再调节器阶段出口处检测到了中度的正电子。通过检测the灭辐射来监测损失。讨论了该方法的可能改进和应用。

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    Benjamin Loewe; Klaus Schreckenbach; Christoph Hugenschmidt;

  • 作者单位

    Universitaet der Bundeswehr Muenchen, Instituet fuer Angewandte Physik und Messtechnik (LRT2), Werner-Heisenberg-Weg 39, 85577 Neubiberg, Germany TU Muenchen, FRM II, Lichtenbergstr. 1, 85747 Garching, Germany TU Muenchen, Physik Department E21, James Franck Str., 85748 Garching, Germany;

    TU Muenchen, FRM II, Lichtenbergstr. 1, 85747 Garching, Germany TU Muenchen, Physik Department E21, James Franck Str., 85748 Garching, Germany;

    TU Muenchen, FRM II, Lichtenbergstr. 1, 85747 Garching, Germany TU Muenchen, Physik Department E21, James Franck Str., 85748 Garching, Germany;

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  • 正文语种 eng
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  • 关键词

    moderation efficiency; positron drift; positron nitrogen scattering; remoderation;

    机译：调节效率;正电子漂移正电子氮散射重审;

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