CERN Accelerating science

R&D and Studies

Requirements and constraints of EIR design option on WP2, WP4, WP5: Milestone M3.3 / Seryi, Andrei (University of Oxford (GB))
In this document we will review the design task of the WP3 (EIR), namely EIR optics (task 1), Machine Detector Interface (task 2), and Beam-Beam effects (task 3) and map the related challenges into the constraints and requirements for the other work packages – arc design (WP2), cryogenic beam vacuum (WP4) and magnet design (WP5). We will also include a section on how the EIR WP3 constraints and design optimization issues may affect the design of the Experimental Detector (this is outside the scope of EuroCirCol, but is one of the key activity area of FCC-hh community design efforts) [...]
CERN-ACC-2017-0022.- Geneva : CERN, 2017 Fulltext: PDF;

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Future Circular Collider Study FCC-he Baseline Parameters / Bruning, Oliver (CERN) ; Jowett, John (CERN) ; Klein, Max (University of Liverpool (GB)) ; Pellegrini, Dario (CERN) ; Schulte, Daniel (CERN) ; Zimmermann, Frank (CERN)
Initial considerations are presented on the FCC-he, the electron-hadron collider con guration within the Future Circular Collider study. This note considers arguments for the choice of the electron beam energy based on physics, ep scattering kinematics and cost. [...]
CERN-ACC-2017-0019.- Geneva : CERN, 2017 Fulltext: PDF;

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The crystal structure of (Nb0.75Cu0.25)Sn2 in the Cu-Nb-Sn system / Martin, Stefan (TU Bergakademie Freiberg) ; Walnsch, Alexander (TU Bergakademie Freiberg) ; Nolze, Gert (Federal Institute for Materials Research and Testing (BAM), Berlin) ; Leineweber, Andreas (TU Bergakademie Freiberg) ; Leaux, Floriane (CERN) ; Scheuerlein, Christian (CERN)
During the processing of superconducting Nb3Sn wire, several intermediate intermetallic phases including a previously encountered Cu-Nb-Sn phase show up. The yet unknown crystal structure of this phase is now identified by a combination of different experimental techniques and database search to be of the hexagonal NiMg2 type with a proposed composition of about (Nb0.75Cu0.25)Sn2. [...]
CERN-ACC-2017-0017.- Geneva : CERN, 2017 - Published in : : 80 (2017) , pp. 16-21 Fulltext: PDF;

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Hadron collective effects studies for the LHC and FCC-hh project / Amorim, David
High intensity particle beams circulating in accelerators can be perturbed by the electromagnetic field created by the beam itself and the interaction with the surrounding environment [...]
CERN-THESIS-2016-258 - 39 p.

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Availability modeling approach for future circular colliders based on the LHC operation experience / Niemi, Arto (Tampere University of Technology (FI)) ; Apollonio, Andrea (CERN) ; Gutleber, Johannes (CERN) ; Sollander, Peter (CERN) ; Penttinen, Jussi-Pekka ; Virtanen, Seppo Johannes
Reaching the challenging integrated luminosity production goals of a future circular hadron collider (FCC-hh) and high luminosity LHC (HL-LHC) requires a thorough understanding of today’s most powerful high energy physics research infrastructure, the LHC accelerator complex at CERN. FCC-hh, a 4 times larger collider ring aims at delivering 10–20 ab−1 of integrated luminosity at 7 times higher collision energy. [...]
CERN-ACC-2017-0002.- Geneva : CERN, 2016 - Published in : Phys. Rev. Accel. Beams 19 (2016) 121003 Fulltext: PDF;

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FCC-hh turn-around cycle / Alemany Fernandez, Reyes (CERN) ; Apollonio, Andrea (CERN) ; Bartmann, Wolfgang (CERN) ; Buffat, Xavier (CERN) ; Niemi, Arto (Tampere University of Technology (FI)) ; Schulte, Daniel (CERN) ; Solfaroli Camillocci, Matteo (CERN) ; Stoel, Linda (Vienna University of Technology (AT))
The turn-around cycle time of a collider is defined as the time spent between the end of stable beams and the start of the next stable beams period, and its calculation is of fundamental importance. On one side it is a crucial ingredient for the computation of the optimal time spent in luminosity production, which defines the integrated luminosity per fill or store. [...]
CERN-ACC-2016-0341.- Geneva : CERN, 2016 Fulltext: PDF;

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Evaluation of critical current density and residual resistance ratio limits in powder in tube Nb3Sn conductors / Segal, Christopher (Applied Superconductivity Center) ; Tarantini, Chiara (Applied Superconductivity Center) ; Sung, Zu Hawn (Applied Superconductivity Center) ; Lee, Peter J (Applied Superconductivity Center) ; Sailer, Bernd (Bruker EAS GmbH) ; Thoener, Manfred (Bruker EAS GmbH) ; Schlenga, Klaud (Bruker EAS GmbH) ; Ballarino, Amalia (CERN) ; Bottura, Luca (CERN) ; Bordini, Bernardo (CERN) et al.
High critical current density ( Jc) Nb3Sn A15 multifilamentary wires require a large volume fraction of small grain (SG), superconducting A15 phase, as well as Cu stabilizer with high Residual Resistance Ratio (RRR) to provide electromagnetic stabilization and protection. In powder-in-tube (PIT) wires the unreacted Nb7.5 wt%Ta outer layer of the tubular filaments acts as a diffusion barrier and protects the interfilamentary Cu stabilizer from Sn contamination. [...]
CERN-ACC-2016-0340.- Geneva : CERN, 2016 - Published in : : 29 (2016) , no. 8 Fulltext: PDF;

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Iron-free detector magnet options for the future circular collider / Mentink, Matthias (CERN) ; Dudarev, Alexey (CERN) ; Pais Da Silva, Helder Filipe (CERN) ; Rolando, Gabriella (CERN) ; Cure, Benoit (CERN) ; Gaddi, Andrea (CERN) ; Klyukhin, Slava (Lomonosov Moscow State U.) ; Gerwig, Hubert (CERN) ; Wagner, Udo (CERN) ; Ten Kate, Herman (CERN)
In this paper, several iron-free solenoid-based designs of a detector magnet for the future circular collider for hadron-hadron collisions (FCC-hh) are presented. The detector magnet designs for FCC-hh aim to provide bending power for particles over a wide pseudorapidity range (0 ≤ jηj ≤ 4). [...]
CERN-ACC-2016-0335.- Geneva : CERN, 2016 - 10 p. - Published in : Phys. Rev. Accel. Beams 19 (2016) 111001 APS Open Access article: PDF;
In : 2nd Annual Meeting of the Future Circular Collider study 2016, Rome, Italy, 11 - 15 Apr 2016

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Higgs Factory Concepts / Zimmermann, Frank (CERN)
Designs for future high-energy circular electron-positron colliders are based on both established and novel concepts. An appropriate design will enable these facilities to serve not only as “Higgs factories”, but also as Z, W and top factories, and, in addition, to become a possible first step to a higher-energy hadron collider..
CERN-ACC-2016-0333.- Geneva : CERN, 2016 Fulltext: PDF;
In : 58th ICFA Advanced Beam Dynamics Workshop on High Luminosity Circular e+e-Colliders , Daresbury, United Kingdom, 24 - 27 Oct 2016

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Summary of impedance issues and beam instabilities / Zimmermann, Frank (CERN)
This paper summarizes the session on impedance issues and beam instabilities at the ICFA workshop on future circular electron-positron factories “eeFACT2016” [1] held at the Cockcroft Institute, Daresbury, from 24 to 27 October 2016. This session also covered active beam stabilization by feedback systems. [...]
CERN-ACC-2016-0332.- Geneva : CERN, 2016 Fulltext: PDF;
In : 58th ICFA Advanced Beam Dynamics Workshop on High Luminosity Circular e+e-Colliders , Daresbury, United Kingdom, 24 - 27 Oct 2016

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Future Circular Collider Documents (86)