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首页> 外文期刊>Japanese journal of applied physics >Numerical Analysis of the Measurement of Near-Beam Electron Cloud Density in Field-Free Region at KEK B-Factory Low-Energy Ring
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Numerical Analysis of the Measurement of Near-Beam Electron Cloud Density in Field-Free Region at KEK B-Factory Low-Energy Ring

机译：KEK B工厂低能环在无场区近束电子云密度测量的数值分析

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摘要

A large number of electrons in the so-called electron cloud are accumulated in beam chambers in positron storage rings. These electrons interact with the beam and can make the beam unstable. The density information of the electron cloud near the beam is therefore fundamental for studying beam instability and mitigation techniques related to the electron cloud. Recently, a method to measure the density of the electron cloud near the beam has been proposed by Kanazawa et al. The method enables the measurement of high-energy electrons selectively using a retarding field analyzer located on a chamber wall, noting that the electrons near the beam receive a strong kick by the beam. They calculated the density of the electron cloud simply assuming that the electrons that receive a kick are stationary. We examined the measurement technique in detail using a new computer code developed by us. The analysis showed that the volume near the beam occupied by the detected electrons, i.e., the observed volume, was strongly deformed owing to the horizontal velocity of the electrons; nevertheless this volume calculated assuming that the stationary electrons can still be used for calculating the density of the electron cloud in their measurement conditions.
机译：所谓电子云中的大量电子聚集在正电子存储环的电子束室中。这些电子与电子束相互作用并使电子束不稳定。因此，电子束附近的电子云的密度信息对于研究与电子云有关的电子束不稳定性和缓解技术至关重要。最近，金泽等人提出了一种测量电子束在电子束附近的密度的方法。该方法能够使用位于腔室壁上的延迟场分析仪选择性地测量高能电子，并注意到光束附近的电子会受到光束的强烈反冲。他们只是假设接收到反冲的电子是静止的，才计算出电子云的密度。我们使用由我们开发的新计算机代码详细检查了测量技术。分析表明，由于电子的水平速度，被检测到的电子所占据的束附近的体积，即所观察到的体积，发生了强烈的变形。但是，该体积的计算是假设静止电子仍可用于在其测量条件下计算电子云的密度。

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  • 来源
    《Japanese journal of applied physics》 |2010年第11期|p.116403.1-116403.6|共6页
  • 作者

    Puneet Jain; Hitoshi Fukuma; Ken-ichi Kanazawa; Yusuke Suetsugu;

  • 作者单位

    The Graduate University for Advanced Studies (Sokendai), Hayama, Kanagawa 240-0193, Japan;

    High Energy Accelerator Research Organization (KEK), Tsukuba, Ibaraki 305-0801, Japan;

    High Energy Accelerator Research Organization (KEK), Tsukuba, Ibaraki 305-0801, Japan;

    The Graduate University for Advanced Studies (Sokendai), Hayama, Kanagawa 240-0193, Japan;

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