Impedance description of coherent synchrotron radiation with account of bunch deformation
We are concerned with coherent longitudinal motion in a storage ring, especially with situations in which coherent synchrotron radiation (CSR) can influence stability of the beam. The collective force from CSR is usually described by an impedance or a wake function in such a way that the force depen...
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American Physical Society
2005-01-01
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Series: | Physical Review Special Topics. Accelerators and Beams |
Online Access: | http://doi.org/10.1103/PhysRevSTAB.8.014402 |
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doaj-b0a75d4e93144a77870d786b69f15bb62020-11-25T00:50:38ZengAmerican Physical SocietyPhysical Review Special Topics. Accelerators and Beams1098-44022005-01-018101440210.1103/PhysRevSTAB.8.014402Impedance description of coherent synchrotron radiation with account of bunch deformationRobert WarnockRonald RuthMarco VenturiniJames A. EllisonWe are concerned with coherent longitudinal motion in a storage ring, especially with situations in which coherent synchrotron radiation (CSR) can influence stability of the beam. The collective force from CSR is usually described by an impedance or a wake function in such a way that the force depends only on the charge distribution at the present time. This description is exact only for a rigid bunch, since causality demands that the force depend on the prior history of the bunch. We show how to treat a deforming bunch by applying the “complete impedance” Z(n,ω), a function of wave number and frequency. We derive this impedance and study its analytic properties for a special model: radiation from circular orbits shielded by parallel plates representing the metallic vacuum chamber. We analyze the corresponding collective force, obtaining the usual formula as a first approximation, plus easily computed corrections that depend on present and prior values of the time derivative of the charge density. In related papers we have applied these results in numerical simulations of instabilities induced by CSR.http://doi.org/10.1103/PhysRevSTAB.8.014402 |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Robert Warnock Ronald Ruth Marco Venturini James A. Ellison |
spellingShingle |
Robert Warnock Ronald Ruth Marco Venturini James A. Ellison Impedance description of coherent synchrotron radiation with account of bunch deformation Physical Review Special Topics. Accelerators and Beams |
author_facet |
Robert Warnock Ronald Ruth Marco Venturini James A. Ellison |
author_sort |
Robert Warnock |
title |
Impedance description of coherent synchrotron radiation with account of bunch deformation |
title_short |
Impedance description of coherent synchrotron radiation with account of bunch deformation |
title_full |
Impedance description of coherent synchrotron radiation with account of bunch deformation |
title_fullStr |
Impedance description of coherent synchrotron radiation with account of bunch deformation |
title_full_unstemmed |
Impedance description of coherent synchrotron radiation with account of bunch deformation |
title_sort |
impedance description of coherent synchrotron radiation with account of bunch deformation |
publisher |
American Physical Society |
series |
Physical Review Special Topics. Accelerators and Beams |
issn |
1098-4402 |
publishDate |
2005-01-01 |
description |
We are concerned with coherent longitudinal motion in a storage ring, especially with situations in which coherent synchrotron radiation (CSR) can influence stability of the beam. The collective force from CSR is usually described by an impedance or a wake function in such a way that the force depends only on the charge distribution at the present time. This description is exact only for a rigid bunch, since causality demands that the force depend on the prior history of the bunch. We show how to treat a deforming bunch by applying the “complete impedance” Z(n,ω), a function of wave number and frequency. We derive this impedance and study its analytic properties for a special model: radiation from circular orbits shielded by parallel plates representing the metallic vacuum chamber. We analyze the corresponding collective force, obtaining the usual formula as a first approximation, plus easily computed corrections that depend on present and prior values of the time derivative of the charge density. In related papers we have applied these results in numerical simulations of instabilities induced by CSR. |
url |
http://doi.org/10.1103/PhysRevSTAB.8.014402 |
work_keys_str_mv |
AT robertwarnock impedancedescriptionofcoherentsynchrotronradiationwithaccountofbunchdeformation AT ronaldruth impedancedescriptionofcoherentsynchrotronradiationwithaccountofbunchdeformation AT marcoventurini impedancedescriptionofcoherentsynchrotronradiationwithaccountofbunchdeformation AT jamesaellison impedancedescriptionofcoherentsynchrotronradiationwithaccountofbunchdeformation |
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