| Item type |
学位論文 / Thesis or Dissertation(1) |
| 公開日 |
2010-02-22 |
| タイトル |
|
|
タイトル |
Effects of Parasitic Collision Points |
| タイトル |
|
|
タイトル |
Effects of Parasitic Collision Points |
|
言語 |
en |
| 言語 |
|
|
言語 |
eng |
| 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 |
PARKHOMTCHOUK, Dmitri
|
| フリガナ |
パルホムチェク, ドミトリ
|
| 著者 |
PARKHOMTCHOUK, Dmitri
|
| 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367号 |
| 研究科 |
|
|
値 |
数物科学研究科 |
| 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 |
1999-03-24 |
| 学位授与年度 |
|
|
|
1998 |
| 要旨 |
|
|
内容記述タイプ |
Other |
|
内容記述 |
In multibunch circular colliders with small bunch spacing we have to deal with parasitic collision points (PCPs) when the opposite bunches interact not only at the interaction point (IP). The interactions in PCPs may change the stable orbits and influence the luminosity by dynamic effects. Here we will study some of the effects which are introduced by PCPs. The subject is not well studied yet because in the usual designs the effects of PCPs are done small. But in order to increase the luminosity in future designs it may change as the currents become large, bunch spacing smaller and the separation in PCPs decreases. As will be shown here there are unusual effects under that conditions. They are of highly non-linear nature, so the study was done mainly by computer simulations. The interaction in PCPs introduces some effects in beam dynamics. We will divide them first on weak and strong. Weak effects happen with moderat beams currents and large enough bunch separation in PCPs. They produce small stable orbit distortion which is insignificant as will be shown. In that case the longitudinal coupling is too small to have noticeable dynamic effects. When the ldcks at PCPs become large enough some interesting effects may happen. The transverse betatron oscillations then are coupled longitudinally between successive bunches. That leads to few phenomenas:<br /> Longitudinal waves of transverse oscillations, which spread from some initial distortion and then damped completely because of synchrotron damping.<br /> Reduced damping time of single excited bunch.<br /> Btmches near the gap ( missing bunches in beam ) have larger betatron amplitudes.<br /> Betatron resonances trapping occurs in more ordered way due to longitudinal coupling.<br /> Diffusion due to stochastic properties of nonlinear forces in IP combined with coupling. It leads to growth of the bunches betatron amplitude and has some general properties of random walk diffusion.<br /> It was shown that shong PCP interactions introduce some significant effects, few of them could be useful to exploit for enhancement of the beam dynamics stability. Some of the effects could be detected and would be interesting to observe on modem multibunch colliders. The subject becomes more important with growing demands on luminosity. |
| 所蔵 |
|
|
値 |
有 |
要旨・審査要旨 / Abstract, Screening Result (243.8 kB)
