Coherent static tune shift due to electron cloud (Draft 3)
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منابع مشابه
Study of Coherent Tune Shift Caused by Electron Cloud in Positron Storage Rings
We discuss the transverse betatron tune shift of the coherent dipole motion of a beam interacting with an electron cloud. A positron beam which passes through a frozen charge distribution experiences an electric field, which shifts its tune in the positive direction. The electrons in the actual cloud are not frozen, but move during the bunch passage. Thus, the electron distribution varies due t...
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Measurements of the electron cloud effects in KEKB have been done since ECLOUD02 workshop. The results are summarized as 1) strength of the solenoid field in the present solenoid system is not enough to suppress the blow-up of the vertical beam size at high bunch currents and/or narrow bunch spacing, 2) solenoids in straight sections as well as arc sections contribute to suppress the electron c...
متن کاملMeasurement of Wakefield Effects Caused by Electron Cloud at Kekb
In order to study the wakefield effects of an electron cloud, a test bunch was placed behind a bunch train, where the cloud density rapidly varied. A currentdependent tune shift and the tune spread of the test bunch were measured as a function of the bunch current while varying the bucket position of the test bunch. The vertical tune shift indicated a strong defocusing force together with a wid...
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We have measured the coherent beam-beam tune shift at KEKB, an asymmetric double-ring electron/positron collider. The relationship between the tune shift and the beam-beam parameter is nonlinear, because the tunes are very close to a half integer. The estimated horizontal emittance is much larger than the calculated value, which is evidence of a dynamic effect due to the beam-beam interaction. ...
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The interference of stray electrons (also called ‘‘electron clouds’’) with accelerator beams is important in modern intense-beam accelerators, especially those with beams of positive charge. In magnetic wigglers, used, for instance, for transverse emittance damping, the intense synchrotron radiation produced by the beam can generate an electron cloud of relatively high density. In this paper th...
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تاریخ انتشار 2008