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Summary of ARIES WP6 APEC & iFAST WP5.2 PAF joint Brainstorming & Strategy Workshop (BSW22) R. Assmann (DESY), C. Carli (CERN), A. Faus-Golfe (IJCLab), E. Fol (CERN), G. Franchetti (GSI & GU Frankfurt), R. Jacobsson (CERN), V. Kain (CERN), F. Kling (DESY), M.W. Krasny (LPNHE), R. Ischebeck (PSI), A. Scheinker (LANL), V. Shiltsev (FNAL), R. Tomas Garcia (CERN), F. Zimmermann (CERN) edited by the BSW2022 workshop organisers A. Faus-Golfe (IJCLab), G. Franchetti (GSI & GU Frankfurt), F. Zimmermann (CERN) The ARIES WP6 APEC & iFAST WP5.2 PAF joint Brainstorming & Strategy Workshop (BSW22) from 30 March to 1 April 2022 addressed (1) present and future AI accelerator applications, and (2) beam requirements and accelerators for the dark sector. For both themes a number of conclusions were formulated. For example, dielectric acceleration appears to be an interesting approach for dark sector searches, calling for a suitable DLA accelerator design and experimental demonstration, while Machine Learning will become a community standard, and should be used for the design optimization of future machines. An intriguing proposal was the use of the LHC based Gamma Factory for driving a subcritical reactor with integrated waste transmutation., This project has received funding from the European Union's Horizon 2020 Research and Innovation programme under Grant Agreements No. 730871 (ARIES) and 101004730 (iFAST).

International audience; The FCC-ee could measure the electron Yukawa coupling in a dedicated run at $\sim $125 GeV collision energy, provided that the center-of-mass (CM) energy spread can be reduced by means of monochromatization, e.g., through introducing nonzero horizontal dispersion of opposite sign at the interaction point (IP), for the two colliding beams. If the IP dispersion is nonzero, beamstrahlung blows up the horizontal emittance, and self-consistent IP parameters need to be determined. Two configurations are being studied. The first uses crab cavities to establish effective head-on collisions. The second configuration maintains the standard FCC-ee crossing angle, which, together with the IP dispersion, introduces a correlation between the local collision energy and the longitudinal location inside the detector, thereby allowing for an integrated scan of the Higgs resonance curve. We compare both approaches.

The FCC-ee collider baseline foresees four different energy operation modes: Z, WW, H(ZH) and ttbar. An optional fifth mode, called s-channel Higgs production mode, could allow the measurement of the electron Yukawa coupling, in dedicated runs at 125 GeV centre-of-mass energy, provided that the centre-of-mass energy spread, can be reduced by at least an order of magnitude (5-10 MeV). The use of a special collision technique: a monochromatization scheme is one way to accomplish it. There are several methods to implement a monochromatization scheme. One method, named transverse monochromatization scheme, consists of introducing a dispersion different from zero but opposite sign for the two colliding beams at the Interaction Point (IP); In this paper we will report about the first attempt to design a new optics to implement a transverse monochromatic scheme for the FCC-ee Higgs production totally compatible with the standard mode of operation without dispersion at the IP., Proceedings of the 13th International Particle Accelerator Conference, IPAC2022, Bangkok, Thailand

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

Physica medica 104, 174 - 187 (2022). doi:10.1016/j.ejmp.2022.10.026, At the Photo Injector Test facility at DESY in Zeuthen (PITZ), an R&D platform for electron FLASH and very high energy electron radiation therapy and radiation biology is being prepared FLASH$\mathrm{{\ell}ab@}$PITZ). The beam parameters available at PITZ are worldwide unique. They are based on experiences from 20 + years of developing high brightness beam sources and an ultra-intensive THz light source demonstrator for ps scale electron bunches with up to 5 nC bunch charge at MHz repetition rate in bunch trains of up to 1 ms length, currently 22 MeV (upgrade to 250 MeV planned). Individual bunches can provide peak dose rates up to 10$^{14}$ Gy/s, and 10 Gy can be delivered within picoseconds. Upon demand, each bunch of the bunch train can be guided to a different transverse location, so that either a “painting” with micro beams (comparable to pencil beam scanning in proton therapy) or a cumulative increase of absorbed dose, using a wide beam distribution, can be realized at the tumor. Full tumor treatment can hence be completed within 1 ms, mitigating organ movement issues. With extremely flexible beam manipulation capabilities, FLASHlab@PITZ will cover the current parameter range of successfully demonstrated FLASH effects and extend the parameter range towards yet unexploited short treatment times and high dose rates. A summary of the plans for FLASH$\mathrm{{\ell}ab@}$PITZ and the status of its realization will be presented., Published by Elsevier, Amsterdam