1,721,026 research outputs found
Review of Coupled Bunch Instabilities in the LHC
No full textIn order to reach the required luminosity, the LHC will have a large number of high intensity bunches. Coupled bunch instabilities can therefore be excited by the higher order modes (HOMs)of the RF cavities, by parasitic cavities and by the transverse resistive wall effect. This report summarises the growth times of the coupled bunch instabilities taking into account the HOMs (damped or undamped)relevant for the 200 MHz normal conducting cavities, the 400 MHz superconducting cavities, as well as other parasitic cavities. It is shown that, with the damped HOMs of the RF cavities, the coupled bunch instabilities remain within control for the LHC operation.As far as the transverse resistive wall effect at injection disconcerned,it is demonstrated that the corresponding growth times can be safely compensated by the proposed transverse feedback system [1]
Comparison of computer codes for estimates of the symmetric coupled bunch instabilities growth times
No full textThe standard computer codes used for estimating the growth times of the symmetric coupled bunch instabilities are ZAP and BBI.The code Vlasov was earlier used for the LHC for the estimates of the coupled bunch instabilities growth time[1]. The results obtained by these three codes have been compared and the options under which their results can be compared are discussed. The differences in the input and the output for these three codes are given for a typical case
Coupled Bunch Instabilities in the LHC
No full textIn the LHC, the coupled bunch instabilities will be mainly driven by the RF cavities and the resistive wall effect. The growth times of these instabilities have been estimated taking into consideration the undamped and damped higher order modes of these cavities. These estimates show that the rise times of the longitudinal coupled bunch instabilities are under control. The proposed transverse feed-back system allows the same conclusion to be drawn for the transverse resistive wall instability
Datasets and figures exploring VHEE on CLARA for manuscript titled: "Potential of CLARA Test Facility for VHEE"
No full textData and scripts used for the figures and analysis performed in the paper "Potential of CLARA Test Facility for VHEE". Input file for BDSIM and the elegant tracking code are included, along with a Mathematica notebook to recreate some of the plots used in the paper.ST/V001612/
Intermediate Review of Single Bunch Collective Effects in the LHC
No full textThis paper presents an intermediate review of the single bunch collective effects in the LHC. It first reviews the LHC impedance budget including all elements for which a design is presently available. Then, based on this updated budget, the corresponding rise times and thresholds for single bunch instabilities are evaluated and discussed
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