Measurement and modeling of electron-cloud-induced betatron tune shifts at the Cornell Electron-Positron Storage Ring test accelerator
Measurement and modeling of electron-cloud-induced betatron tune shifts at the Cornell Electron-Positron Storage Ring test accelerator
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康奈尔电子正电子存储环测试加速器上电子云引起的电子感应加速器调谐偏移的测量和建模
DOI:
10.1103/physrevaccelbeams.22.081001
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发表时间:
2019
影响因子:
1.7
通讯作者:
San Soucie, J. E.
中科院分区:
文献类型:
--
作者:
Poprocki, S.;Buechele, S. W.;Crittenden, J. A.;Rowan, K.;Rubin, D. L.;San Soucie, J. E.
We report on extensive measurements at the Cornell Electron-Positron Storage Ring of electron-cloud-induced betatron tune shifts for trains of positron bunches at 2.1 and 5.3 GeV with bunch populations ranging betweenand. Measurements using a witness bunch with variable distance from the end of the train and variable bunch population provide information on cloud decay and cloud pinching during the bunch passage. We employ Monte Carlo simulations of the reflection and absorption of synchrotron radiation photons to determine the pattern of absorption sites around the circumference of the storage ring. TheGeant4 simulation toolkit is used to model the interactions of the photons with the beampipe wall and determine the production energy and location distributions of the photoelectrons which seed the electron cloud. An electron cloud buildup model based on fitted ring-averaged secondary-yield properties of the vacuum chamber predicts tune shifts in good agreement with the measurements.
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DOI:
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