MC1: Circular and Linear Colliders
A01 Hadron Colliders
Paper Title Page
MOVIR01 The Future Circular Collider Study 6
  • F. Zimmermann, M. Benedikt
    CERN, Meyrin, Switzerland
  • A.-S. Müller
    KIT, Eggenstein-Leopoldshafen, Germany
  Funding: This work was supported, in part, by the European Commission under the HORIZON2020 Research and Innovation Programme, grant agreement 951754 (FCCIS).
At the end of 2018, a large worldwide collaboration, with contributors from more than 350 institutes completed the conceptual design of the Future Circular Collider (FCC), a ~100 km accelerator infrastructure linked to the existing CERN complex, that would open up the way to the post-LHC era in particle physics. We present an overview of the two main accelerator options considered in the design study, namely the lepton collider (FCC-ee), serving as highest-luminosity Higgs and electroweak factory, and the 100-TeV energy-frontier hadron collider (FCC-hh), along with the ongoing technological R&D efforts and the planned next steps. A recently approved EU co-funded project, the FCC Innovation Study (FCCIS), will refine the design of the lepton collider and prepare the actual implementation of the FCC, in collaboration with European and global partners, and with the local authorities.
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About • paper received ※ 09 June 2020       paper accepted ※ 04 September 2020       issue date ※ 12 October 2020  
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First Demonstration of Electron Cooling in a Collider  
  • A.V. Fedotov, M. Blaskiewicz, K.A. Drees, W. Fischer, X. Gu, D. Kayran, J. Kewisch, C. Liu, A. Marusic, K. Mernick, M.G. Minty, V. Ptitsyn, G. Robert-Demolaize, V. Schoefer, S. Seletskiy, P. Thieberger, H. Zhao
    BNL, Upton, New York, USA
  Funding: Work supported by the U.S. Department of Energy.
High-energy electron cooling is being considered for several accelerator physics projects worldwide, including various designs of an Electron Ion Collider. Since accelerating dc electron beams above few MeV is technologically challenging, rf-acceleration of electron bunches becomes more practical for high-energy applications. A world’s first electron cooling of ion beams employing such rf-accelerated electron bunches was recently demonstrated at BNL using the Low Energy RHIC electron Cooler (LEReC). Many challenges associated with such an approach were successfully overcome. The cooling task becomes even more challenging when one attempts to cool ion beams in collisions, requiring careful optimization between the electron cooling process and the ion beam lifetime due to various effects, including the beam-beam interactions. In this paper, we discuss first successful application of electron cooling for colliding ion beams in RHIC, as well as requirements and challenges of electron cooling in a collider.
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