Electron-cloud Simulations: an Update
نویسنده
چکیده
Recent simulation results and some analytical estimates are presented on beam-induced multipacting in SPS, PS, and LHC. In particular, we discuss modifications to the secondary emission model, electron cloud build up simulated for various filling patterns, central cloud density, electron ‘pinch’ during the bunch passage, expected tune shifts and tune spreads, memory between LHC bunch trains, heat loads in LHC arcs and straight sections, consequences of varying bunch spacing, suppression of multipacting by solenoids, ‘scrubbing’ dose estimates, energy and angular distribution of electrons lost to the wall, and a possible degradation of beam-position monitor signals due to the electron cloud. Special emphasis is placed on the effect of elastically re-scattered electrons, which, if present as modelled, may substantially increase the predicted heat loads for LHC as well as the total number of electrons in the vacuum chamber.
منابع مشابه
Progress on simulation of beam dynamics with electron cloud effects: An update
This paper provides a brief review of progress on the simulation methods associated with studying the beam response to electron cloud effects. Comparison of results obtained from the program CMAD and other similar programs are reported. An update on recent developments and future planned upgrades to CMAD are discussed.
متن کاملUpdate on Electron-cloud Simulations Using the Package Warp-posinst∗
At PAC05[1] and PAC07[2], we presented the package WARP-POSINST for the modeling of the effect of electron clouds on high-energy beams. We present here the latest developments in the package. Three new modes of operations were implemented: 1) a build-up mode where, similarly to POSINST (LBNL) or ECLOUD (CERN), the build-up of electron clouds driven by a legislated bunch train is modeled in one ...
متن کاملElectron Cloud Effects, Vacuum (sps+lhc) Summary
The session summarised here was devoted to Electron Cloud Effects and Vacuum in the SPS and LHC. Seven talks were presented, covering recent experimental observations of electron cloud effects at the KEK-B Low Energy Ring (LER), measurements of surface properties at EPA, simulations of electron cloud build-up and heat load, vacuum observations and electron scrubbing in the SPS with LHC type bea...
متن کاملSummary of Session D: Simulations of Electron Cloud Build up I
This report is a brief summary of the session D of the workshop ECLOUD04 about electron cloud build up simulations (Part I). In this session the status of some of the existing codes for the build up simulations has been reported and updates on the progress towards new powerful 3D and self-consistent codes have been presented. Simulations specifically applied to damping rings for linear collider...
متن کاملCloud Service-Aware Location Update in Mobile Cloud Computing
Mobile devices are becoming the primary platforms for many users who always roam around when accessing the cloud computing services. From this, the cloud computing is integrated into the mobile environment by introducing a new paradigm, mobile cloud computing. In the context of mobile computing, the battery life of mobile device is limited, and it is important to balance the mobility performanc...
متن کامل