Transient beam loading effects in harmonic rf systems for light sources
نویسندگان
چکیده
منابع مشابه
Computed Transient Beam Loading Effects with Harmonic RF Systems
Harmonic cavities have been used in storage rings to lengthen bunches and increase beam lifetimes dominated by Touschek scattering. Transient beam loading in the harmonic cavities generated by asymmetries in the fill pattern can cause significant variation of the beam phase and bunch length along the bunch train when the longitudinal restoring force has been reduced, resulting in a significant ...
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We report on the commissioning of a higher harmonic radiofrequency system at the Advanced Light Source, designed to improve the beam lifetime. We have achieved an increase above a factor of two in our best results up to now. Transient beam loading of the harmonic cavities, due to the unequal fill patterns, creates the greatest limitations on lifetime improvement. We also describe several intere...
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Advanced Synchrotron Light Sources must perform with extremely high beam stability to maintain their source brightness characteristics, and this must be achieved with large multi-bunch beam currents. With the provision of very low emittance and use of high harmonic output from insertion devices, control of beam current instability thresholds is essential. At present no operating Light Source us...
متن کاملTransient Analysis of Rf Cavities under Beam Loading
Abstract The conventional electrical model analogy of a RF cavity is a shunt RLC circuit supplied by two current sources representing the RF amplifier and the beam. In the literature, the impedance of the cavity is often calculated in the Fourier domain. This type of cavity modelling has two drawbacks: First, it assumes a perfect matching between the cavity and the amplifier therefore it neglec...
متن کاملBeam Loading in Rf Cavities
Beam loading is the conventional term for the effect of beam passage through an RF cavity installed for the control of some beam parameters such as energy, bunch length, energy spread, etc... The fields developed in such a structure and their effect on the beam can be analyzed as for all other discontinuities of the vacuum chamber. In particular, F. Sacherer's theory of impedances and beam inst...
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ژورنال
عنوان ژورنال: Physical Review Special Topics - Accelerators and Beams
سال: 2002
ISSN: 1098-4402
DOI: 10.1103/physrevstab.5.092001