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  1. 020 学位論文
  2. 高エネルギー加速器科学研究科
  3. 12 加速器科学専攻

NUMERICAL ANALYSIS OF THE MEASUREMENT OF NEAR BEAM ELECTRON CLOUD DENSITY AT KEKB LOW ENERGY RING

https://ir.soken.ac.jp/records/2164
https://ir.soken.ac.jp/records/2164
82e4f850-17fd-4664-94c6-ff71c2100441
名前 / ファイル ライセンス アクション
甲1379_要旨.pdf 要旨・審査要旨 (224.7 kB)
甲1379_本文.pdf 本文 (6.0 MB)
Item type 学位論文 / Thesis or Dissertation(1)
公開日 2011-06-03
タイトル
タイトル NUMERICAL ANALYSIS OF THE MEASUREMENT OF NEAR BEAM ELECTRON CLOUD DENSITY AT KEKB LOW ENERGY RING
タイトル
タイトル NUMERICAL ANALYSIS OF THE MEASUREMENT OF NEAR BEAM ELECTRON CLOUD DENSITY AT KEKB LOW ENERGY RING
言語 en
言語
言語 jpn
資源タイプ
資源タイプ識別子 http://purl.org/coar/resource_type/c_46ec
資源タイプ thesis
著者名 JAIN, PUNEET

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JAIN, PUNEET

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フリガナ ジェイン, プニート

× ジェイン, プニート

ジェイン, プニート

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著者 JAIN, Puneet

× JAIN, Puneet

en JAIN, Puneet

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学位授与機関
学位授与機関名 総合研究大学院大学
学位名
学位名 博士(理学)
学位記番号
内容記述タイプ Other
内容記述 総研大甲第1379号
研究科
値 高エネルギー加速器科学研究科
専攻
値 12 加速器科学専攻
学位授与年月日
学位授与年月日 2010-09-30
学位授与年度
値 2010
要旨
内容記述タイプ Other
内容記述 A large number of electrons called an electron cloud are accumulated in beam
chambers in positron storage rings. These electrons interact with the beam and can
make it unstable. The density information of the electron cloud near the beam is
therefore fundamental for studying the beam instabilities and mitigation techniques
related to the electron cloud. Recently Kanazawa et al. proposed a method to measure
the density of the electron cloud near the beam. The method measures high-energy
electrons selectively by a retarding field analyzer located on a chamber wall, noting
that the electrons near the beam get 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 by 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 due to the horizontal
velocity of the electrons and nevertheless the observed volume calculated assuming
the stationary electrons can still be used for calculating the density of the electron
cloud in their measurement conditions. The modeling of electron cloud generation in
a field-free region of KEK B-Factory (KEKB) LER (Low Energy Ring), analysis of
the measurement, comparison of the measured density with simulations and a
possible improvement in the design of electron monitor are presented in details.
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