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    CERN Super Proton Synchrotron and an alternative design as prebooster ring for the future circular collider e plus e- injector complex
    (Amer Physical Soc, 2023) Etisken, O.; Antoniou, F.; Papaphilippou, Y.; Tydecks, T.; Zimmermann, F.; Ciftci, A. K.; Oide, K.
    The Future Circular Collider (FCC) e+e- injector complex needs to produce and transport highintensity e+ and e- beams at a fast repetition rate for topping up at collision energy. Two options are considered for a preaccelerator ring, to be used for an intermediate accumulation and acceleration before the bunches are transferred to the high-energy booster. One option is a slightly modified Super Proton Synchrotron (SPS), and the other is designing a new ring. We explore the needs and parameters of the existing SPS as prebooster ring and also develop a conceptual design of an alternative accelerator ring. After establishing the basic parameters, we describe the optics design and layout and discuss the single-particle linear and nonlinear dynamics optimization, including magnetic and alignment errors. In addition, we present synchrotron radiation power studies and analytical estimates of various collective effects for both prebooster ring design options, including space charge, intrabeam scattering, longitudinal microwave instability, transverse mode coupling instability, ion effects, electron cloud, and coherent synchrotron radiation.
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    Öğe
    CERN Super Proton Synchrotron and an alternative design as prebooster ring for the future circular collider e+e- injector complex
    (American Physical Society, 2023) Etisken, O.; Antoniou, F.; Papaphilippou, Y.; Tydecks, T.; Zimmermann, F.; Ciftci, A.K.; Oide, K.
    The Future Circular Collider (FCC) e+e- injector complex needs to produce and transport high-intensity e+ and e- beams at a fast repetition rate for topping up at collision energy. Two options are considered for a preaccelerator ring, to be used for an intermediate accumulation and acceleration before the bunches are transferred to the high-energy booster. One option is a slightly modified Super Proton Synchrotron (SPS), and the other is designing a new ring. We explore the needs and parameters of the existing SPS as prebooster ring and also develop a conceptual design of an alternative accelerator ring. After establishing the basic parameters, we describe the optics design and layout and discuss the single-particle linear and nonlinear dynamics optimization, including magnetic and alignment errors. In addition, we present synchrotron radiation power studies and analytical estimates of various collective effects for both prebooster ring design options, including space charge, intrabeam scattering, longitudinal microwave instability, transverse mode coupling instability, ion effects, electron cloud, and coherent synchrotron radiation. © 2023 authors. Published by the American Physical Society. Published by the American Physical Society under the terms of the "https://creativecommons.org/licenses/by/4.0/"Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI.
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    Status of the High Energy Booster of the lepton option of the future circular collider
    (Sissa Medialab Srl, 2022) Dalena, B.; Chance, A.; Antoniou, F.; Etisken, O.; Mashal, A.; Raubenheimer, T.; Zampetakis, M.
    In the context of the FCC IS European study, which investigates the feasibility of a 100 km circular e+e- collider for the future high-energy physics research, we present the design status of the High Energy Booster (HEB) ring. In order to perform precision measurements of the Z, W and H bosons, as well as of the top quark, unprecedented luminosities are required. To reach this goal and to fill the collider, it is mandatory to continuously top-up inject some beam with emittances comparable to those in the collider, so as to maintain an intensity difference between colliding electron and positron bunches below a few %. The main challenges of the HEB design are achieving the collider equilibrium emittances with a fast cycle, and determining the minimum booster injection energy allowing for stable operation. We present the status of the optics design of the HEB, taking into account the above challenges, and the impact of magnetic field imperfections on the dynamic aperture at injection. © Copyright owned by the author(s) under the terms of the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License (CC BY-NC-ND 4.0)