# R&D and Studies

2021-09-23
17:25
 Focus Point on A Future Higgs & Electroweak Factory (FCC): Challenges towards Discovery : Part III: Theoretical Challenges Springer, 2021.

2021-09-19
15:49
 FCC-ee: the synthesis of a long history of e+e- circular colliders / Oide, K (KEK, Tsukuba) ; Wenninger, J (CERN) The design of FCC-ee is relying on the accumulated experience of $\mathrm {e^{+}e^{-}}$ colliders that have been designed, constructed and operated in the past 40 years. FCC-ee will surpass the 26.7 km long Large Electron Positron collider LEP by a factor 4 in size. [...] 2021 - 7 p. - Published in : Eur. Phys. J. Plus 136 (2021) 924 Fulltext: PDF; In : Focus Point on A Future Higgs & Electroweak Factory (FCC): Challenges towards Discovery, pp.924

2021-08-21
10:19
 Phase Evolution During Heat Treatment of Nb$_3$Sn Wires Under Development for the FCC Study / Hopkins, Simon C (CERN) ; Baskys, Algirdas (CERN) ; Ballarino, Amalia (CERN) ; Lachmann, Jonas (TU Bergakademie Freiberg) ; Leineweber, Andreas (TU Bergakademie Freiberg) In recent years, the phase formation sequence during heat treatment of Nb$_3$Sn wires, and the influence of the microstructure and compositional homogeneity of Nb$_3$Sn on in-field critical current ($I_c$), have received increasing attention. For RRP wires, the importance of understanding and managing the formation of the ternary phase nausite has been demonstrated. [...] 2021 - 6 p. - Published in : IEEE Trans. Appl. Supercond. 31 (2021) 1-6 Fulltext: PDF;

2021-08-19
10:41
 Focus Point on A Future Higgs & Electroweak Factory (FCC): Challenges towards Discovery : Part II: Physics Opportunities and Challenges Springer, 2021.

2021-07-25
23:14
 Accelerating cavity and higher order mode coupler design for the Future Circular Collider / Gorgi Zadeh, Shahnam CERN-THESIS-2020-358 - http://purl.uni-rostock.de/rosdok/id00003023 : Universität Rostock , 2021-05-11.

2021-07-22
17:44
 High-Temperature Superconductor Coatings for Beam Impedance Reduction in Particle Colliders: Nonlinear Effects / Calatroni, Sergio (CERN) ; Vaglio, Ruggero (CNR-SPIN, Naples ; INFN, Naples) Coating of surfaces facing particle beams with hightemperature superconductors (HTS) for reducing the beam coupling impedance is being considered for the next generation of hadron colliders, such as the FCC-hh at CERN, where HTS would be exposed to the high-frequency wakefields generated by the particle bunches and to the strong field of the steering magnets. In this frame, we present a simple model for the calculation of the microwave response of HTS exposed to a strong external magnetic field, which takes into account the nonlinearity of the pinning potential of the vortex lattice. [...] 2021 - 8 p. - Published in : IEEE Trans. Appl. Supercond. 31 (2021) 3500208 Fulltext: PDF;

2021-07-20
09:50
 Self-Modulation Development of a Proton Bunch in Plasma / Bachmann, Anna-Maria CERN-THESIS-2021-094 - http://mediatum.ub.tum.de/?id=1595621 : mediaTUM, 2021-07-16.

2021-07-19
16:57
 Considerations Towards a High Field Accelerator Magnets Programme Part I: Motivation, Goals, Challenges and Program Drivers / Bottura, Luca (CERN) The Large Hadron Collider (LHC) at CERN can be regarded as the ultimate collider built with Nb-Ti magnets. [...] CERN-ACC-NOTE-2021-0016. - 2021. - 21 p.

2021-06-18
06:16
 First demonstration of the use of crab cavities on hadron beams / Calaga, R (CERN) ; Alekou, A (Manchester U.) ; Antoniou, F (CERN) ; Appleby, R B (Manchester U.) ; Arnaudon, L (CERN) ; Artoos, K (CERN) ; Arduini, G (CERN) ; Baglin, V (CERN) ; Barriere, S (CERN) ; Bartosik, H (CERN) et al. Many future particle colliders require beam crabbing to recover geometric luminosity loss from the nonzero crossing angle at the interaction point (IP). A first demonstration experiment of crabbing with hadron beams was successfully carried out with high energy protons. [...] 2021 - 6 p. - Published in : Phys. Rev. Accel. Beams 24 (2021) 062001 Fulltext: PDF;

2021-06-18
06:16
 Optimized injector schemes for FCC-ee positron production / Bai, B (Beijing, Inst. High Energy Phys. ; IJCLab, Orsay ; Beijing, GUCAS) ; Faus-Golfe, A (IJCLab, Orsay) ; Han, Y (IJCLab, Orsay) ; Chaikovska, I (IJCLab, Orsay) ; Zhou, Z (Beijing, Inst. High Energy Phys.) ; Chi, Y (Beijing, Inst. High Energy Phys.) ; Oide, K (CERN ; KEK, Tsukuba) ; Zimmermann, F (CERN) Injectors and in particular the positron production systems are a crucial element in linear and circular colliders. The proposed FCC-ee injector linac accelerates both electrons and positrons up to 6 GeV in order to be injected into the Pre-Booster Ring (PBR) with a high intensity of 3.5 nC per bunch for the Z running mode. [...] 2021 - 14 p. - Published in : Nucl. Instrum. Methods Phys. Res., A 1009 (2021) 165463

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