Proceedings of the ICFA mini-Workshop on Mitigation of Coherent Beam Instabilities in Particle Accelerators, Zermatt, Switzerland, 23–27 September 2019Vol. 9 (2020)
Editors: E. Métral, G. Rumolo, T. Pieloni
This ICFA Mini-Workshop on “Mitigation of Coherent Beam Instabilities in Particle Accelerators" (MCBI2019) focused on all the mitigation methods for all the coherent beam instabilities, reviewing in detail the theories (and underlying assumptions), simulations and measurements on one hand, but on the other hand trying to compare the different mitigation methods (e.g. with respect to other effects such as beam lifetime) to provide the simplest and more robust solutions for the day-to-day operation of the machines.
ISBN 978-92-9083-588-2 (paperback), ISBN 978-92-9083-589-9 (PDF)
ECLOUD’18 : Proceedings of the Joint INFN-CERN-ARIES Workshop on Electron-Cloud Effects, 3–7 June 2018, La Biodola, Isola d’Elba, ItalyVol. 7 (2020)
Editors: R. Cimino, G. Rumolo, F. Zimmermann
This report contains the proceedings of the sixth electron-cloud workshop, ECLOUD'18, held, from 3 to 7 June 2018 at La Biodola (Isola d'Elba) Italy. The ECLOUD’18 workshop reviewed many recent electron-cloud (EC) observations at existing storage rings, EC predictions for future accelerators, and various advanced electron-cloud studies. The existence of EC effects in many frontier accelerators has by now been firmly established. It is a consequence of the strong coupling between a positively charged particle beam and a cloud of electrons that almost inevitably builds up inside the vacuum chamber. The EC causes various effects limiting accelerator performance, such as beam instabilities, beam losses, emittance growth, increases in vacuum pressure, additional heat load on the vacuum chamber walls inside cold magnets, and interference with certain types of beam diagnostics.
At ECLOUD’18, recent EC studies were presented, discussed and compared: electron-cloud observations at the LHC, SuperKEKB, CESR-TA and DAFNE; electron-cloud predictions for FAIR, NICA, EIC and for the FCC and other machines; electron-cloud mitigation measures, such as clearing electrodes, graphite/carbon coatings, and chemically or laser treated surfaces; modeling of incoherent electron-cloud effects; self-consistent simulations including ionized molecules; synergies with other communities like the Valencia Space Consortium and the European Space Agency, surface science experts and specialists for conventional accelerator impedance.
ECLOUD’18 identified a number of open questions and defined future R&D needs.
Proceedings of "Tracking Collimation" ICFA WorkshopVol. 2 (2018)Beam collimation and machine protection have become essential aspects for modern high stored energy accelerators. The understanding of operating facilities and the performance extrapolations for future machines demands unprecedented accuracy in simulations of beam cleaning systems. This is critical for the Large Hadron Collider (LHC) and for its High-Luminosity (HL) upgrade project and for the Future Circular Collider (FCC) presently under study, but also for a number of other lower energy accelerators that operate with high hadron beam intensities. These simulations require precise tracking of halo particles with large betatron amplitudes and off-momentum errors as well as precise modelling for the scattering with collimator materials and aperture checks. Several tools have been developed by different teams, putting together the required competence to improve simulation accuracy on all fronts. High-efficient cleaning simulations require in addition very demanding CPU power, as high statistics is required for loss predictions at the 1e-5 level and below. In recent years, important progress was made in the context of FP7 programmes on LHC collimation studies.
Proceedings of the ICFA Mini-Workshop "Impedances and Beam Instabilities in Particle Accelerators"Vol. 1 (2018)The ICFA Mini-Workshop on Beam Coupling Impedances and Beam Instabilities in Particle Accelerators was held in Benevento (Italy) from 18 to 22 September, 2017. The workshop was intended initially to continue the tradition of dedicated conferences on beam coupling impedances in particle accelerators, initiated with the 2014 ICFA mini-Workshop on “Electromagnetic Wake Fields and Impedances in Particle Accelerators” held in Erice (organised by Vittorio Vaccaro, Maria Rosaria Masullo and Elias Métral). Therefore, the aim of the event was first of all to provide an up-to-date review of the subject of beam coupling impedances (theory & modelling, simulation tools, bench measurements, beam based measurements). Besides, it was decided to widen its scope to include recent advances on theory and simulations of beam instabilities. The workshop was hosted by the University of Sannio in Benevento (Italy). Benevento is a world heritage city in Southern Italy, with remarkable monuments and fine pieces of arts, in a unique cultural and natural environment.
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