Search

A special session at eeFACT’22 reviewed the electrical power budgets and luminosity risks for eight proposed future Higgs and electroweak factories (CCC, CEPC, CERC, CLIC, FCC-ee, HELEN, ILC, and RELIC) and, in comparison, for a lepton-hadron collider (EIC) presently under construction. We report highlights of presentations and discussions., Proceedings of the 65th ICFA Advanced Beam Dynamics Workshop on High Luminosity Circular e+e- Colliders, eeFACT2022, Frascati, Italy

Future e⁺e⁻ colliders will need positron sources that stretch present technical capabilities. The project teams for these proposed colliders are working to extend these capabilities. A positron source encompasses many elements: an electron driver, production target, lattice optics, capture section, damping ring(s), injection/extraction short-pulse kickers, an emittance preserving complex delivery system, specific injection specifications, and (perhaps) polarization. The required technical parameters need to accommodate many beam aspects including bunch intensities, final emittances, spacings, train lengths, and desired damping times. For this note, the technical requirements for positrons related to bunch charges, number of bunches, damping ring lengths and damping times for the various positron sources for the presently proposed colliders are compared, concentrating on their damping ring specifications., Proceedings of the 65th ICFA Advanced Beam Dynamics Workshop on High Luminosity Circular e+e- Colliders, eeFACT2022, Frascati, Italy

This document discusses the machine parameters and expected luminosity performance for the proposed future circular lepton collider FCC-ee. Particular emphasis is put on availability, physics run time, and efficiency. Key performance assumptions are compared with the operational experience of several past and present colliders including their injectors - LHC, LEP/LEP-2, PEP-II, KEKB, BEPCII, DAΦNE, SLC and the SPS complex., Proceedings of the 62th ICFA ABDW on High Luminosity Circular e$^+$e$^-$ Colliders, eeFACT2018, Hong Kong, China

The schemes for full-energy top-up injection into an e⁺e⁻ collider will be discussed emphasizing technical issues to be accommodated. The issues include energy stability, energy spread control, transverse emittance reduction, transverse position and angle stability, collimation, background control in the detector, detector blanking of event triggers, and bunch filling strategies. Strategies and observations from PEP-II and KEKB will be included., Proceedings of the 58th ICFA Advanced Beam Dynamics Workshop on High Luminosity Circular e^+e^- Colliders, eeFACT2016, Daresbury, UK

Future e⁺e⁻ colliders will operate with many bunches, short bunch lengths, small emittances, high currents, and small interaction point betas. The stability of the colliding beams with these characteristics will depend on detailed, high precision, and continuous measurements. The various beam measurement requirements and techniques will be discussed using PEP-II observations as a starting point., Proceedings of the 58th ICFA Advanced Beam Dynamics Workshop on High Luminosity Circular e^+e^- Colliders, eeFACT2016, Daresbury, UK

In order to maintain an optimum beam collision condition in a double ring collider such as SuperKEKB it is essential to have an orbit feedback system at the interaction point (IP). We have designed such a system based on experiences at KEKB and PEP-II. For the vertical offset and crossing angle, we will rely on the system based on the beam orbit measurement similar to that used at KEKB. For the horizontal offset, however, we will utilize the dithering system which was successfully used at PEP-II, because the horizontal beam-beam kick is very weak with the "nano-beam scheme". Some hardware devices have been already fabricated and others are in preparation. The present status of the development is reported., Proceedings of the 6th Int. Particle Accelerator Conf., IPAC2015, Richmond, VA, USA