Bessy Vsr 1.5 Ghz Cavity Design and Considerations on Waveguide Damping
نویسندگان
چکیده
The BESSY VSR upgrade of the BESSY II light source [1] represents a novel approach to simultaneously store long (ca. 15ps) and short (ca. 1.5ps) bunches in the storage ring with the “standard” user optics. To this end, new high-voltage L-Band superconducting multi-cell cavities must be installed in one of the straights of the ring. These 1.5 GHz and 1.75 GHz cavities are based on 1.3 GHz systems being developed for the bERLinPro energy-recovery linac. This paper describes the baseline electromagnetic design of the first 5-cell cavity operating at 1.5 GHz as well different design approaches to ensure reliable operation.
منابع مشابه
Bessy Vsr: a Novel Application of Srf for Synchrotron Light Sources
CW SRF Cavities have been used very successfully in the past in synchrotron light sources to provide high power acceleration. Here we present a novel application of higher harmonic systems of two different frequencies (1.5 GHz and 1.75 GHz) to generate a beating of accelerating voltage. With such a system it is possible to store "standard" (some 10 ps long) and "short" (ps and sub-ps long) puls...
متن کاملA Superconducting Landau Accelerator Module for Bessy Ii
The installation of a 3rd harmonic Landau accelerator module is planned at BESSY II to improve the beam lifetime. The passive cavity shall provide an accelerating voltage up to 500 kV for beam currents from 10 to 500 mA. A CESR Phase-III cavity [1], scaled to 1.5 GHz, will be used. The cavity design provides strong damping of higher-order modes by ferrite loads on the beam tubes. A new module, ...
متن کاملFirst Cavity Design Studies for the Bessy-vsr Upgrade Proposal
Recently HZB proposed an upgrade of the 3 generation synchrotron light source BESSY II allowing simultaneous long and short pulse operation [1]. For this scheme superconducting higher harmonic cavities of the fundamental 500MHz at two frequencies need to be installed in the BESSY II storage ring. Given an appropriate choice of the higher harmonics the resulting gradient leads to a beating effec...
متن کاملAnalysis of Coupled Bunch Instabilities in Bessy-vsr
BESSY-VSR, a scheme where 1.5 ps and 15 ps long bunches (rms) can be stored simultaneously in the BESSY II storage ring has recently been proposed [1]. The strong longitudinal bunch focusing is achieved by superconducting high gradient RF cavities. This paper presents investigations of coupled bunch instabilities driven by HOMs of superconducting multi-cell cavities in BESSY-VSR. Analytical cal...
متن کاملThe Variable pulse length Storage Ring (BESSY VSR) upgrade to BESSY II at Helmholtz-Zentrum Berlin (HZB)
The Variable pulse length Storage Ring (BESSY VSR) upgrade to BESSY II at Helmholtz-Zentrum Berlin (HZB) requires an upgrade on the RF systems in the form of highvoltage longitudinally focusing super conducting RF cavities of 1.5GHz and 1.75GHz. Coaxial RF power couplers capable of handling 13 kW peak power at standing wave operation, are required to provide an average power of 1.5 kW for both ...
متن کامل