Author: Holzer, B.J.
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TUPMW019 First Evaluation of Dynamic Aperture at Injection for FCC-hh 1466
 
  • B. Dalena, D. Boutin, A. Chancé, J. Payet
    CEA/IRFU, Gif-sur-Yvette, France
  • B.J. Holzer, R. Martin, D. Schulte
    CERN, Geneva, Switzerland
 
  Funding: This Research and Innovation Action project submitted to call H2020-INFRADEV-1-2014-1 receives funding from the European Union's H2020 Framework Programme under grant agreement no. 654305.
In the hadron machine option, proposed in the context of the Future Circular Colliders (FCC) study, the dipole field quality is expected to play an important role, as in the LHC. A preliminary evaluation of the field quality of dipoles, based on the Nb3Sn technology, has been provided by the magnet group. The effect of these field imperfections on the dynamic aperture, using the present lattice design, is presented and first tolerances on the main multipole components are evaluated.
 
DOI • reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-TUPMW019  
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TUPMW020 Status of the Beam Optics of the Future Hadron-Hadron Collider FCC-hh 1470
 
  • A. Chancé
    CEA/DSM/IRFU, France
  • D. Boutin, B. Dalena, J. Payet
    CEA/IRFU, Gif-sur-Yvette, France
  • B.J. Holzer, R. Martin, D. Schulte
    CERN, Geneva, Switzerland
 
  Funding: This work was supported by the HORIZON 2020 project EuroCirCol, grant agreement 654305.
Following the recommendations of the European Strategy Group for High Energy Physics, CERN launched a design study for possible future circular collider projects, FCC, to investigate their feasibility for high energy physics research. The study covers three options, a proton-proton collider, a circular e+/e collider and a scenario for e-p collisions to study deep inelastic scattering. The present paper describes the beam optics and the lattice design of the Future Hadron-Hadron Collider (FCC-hh). The status of the first order and second order optics of the ring will be shown for collisions at the required centre-of-mass energy of 100 TeV cm.
 
DOI • reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-TUPMW020  
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THPMB042 Residual Orbit Correction Studies for the FCC-hh 3332
 
  • D. Boutin, B. Dalena
    CEA/IRFU, Gif-sur-Yvette, France
  • A. Chancé, J. Payet
    CEA/DSM/IRFU, France
  • B.J. Holzer, R. Martin, D. Schulte
    CERN, Geneva, Switzerland
 
  The FCC-hh (Future Hadron-Hadron Circular Collider) is one of the three options considered for the next genera-tion accelerator in high-energy physics as recommended by the European Strategy Group [*]. Preliminary studies have started to estimate the design parameters of FCC-hh. One of these studies is the calculation of the residual orbit in the arcs of the collider. This is very important for the evaluation of the alignment tolerances of the quadru-poles used in the arcs, the dimensioning of the correctors and of the beam screen. Moreover it has an impact on the dynamic aperture of the ring and the field tolerances of the arc multipoles. To perform the simulations, the beam transport code MADX has been used. Systematic studies of the residual orbit and of the correctors' strength de-pendence on the magnets misalignment or field errors are presented and discussed.
[*] A. Ball et al., EDMS-0134202.
 
DOI • reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-THPMB042  
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THPOR001 Tolerance Studies and Dispersion Free Steering for Extreme Low Emittance in the FCC-ee Project 3759
 
  • S. Aumon, A. Doblhammer, B. Härer, B.J. Holzer
    CERN, Geneva, Switzerland
  • B. Härer
    KIT, Karlsruhe, Germany
  • K. Oide
    KEK, Ibaraki, Japan
 
  The FCC-ee study is investigating the design of a 100 km e+/e circular collider for precision measurements and rare decay observations in the range of 90 to 350 GeV center of mass energy with luminosities in the order of 1035 cm-2s-1. In order to reach such performances, an extreme focusing of the beam is required in the interaction regions with a low vertical beta function of 2 mm at the IP. Moreover, the FCC-ee physics program requires very low emittances never achieved in a collider with 2 nm for εx and 2 pm for εy, reducing the coupling ratio to 1/1000. With such requirements, any field errors and sources of coupling will introduce spurious vertical dispersion which degrades emittances, limiting the luminosity of the machine. This paper describes the tolerance study and the impact of errors will affect the vertical emittance. In order to preserve the FCC-ee performances, in particular εy, a challenging correction scheme is proposed to keep the coupling and the vertical emittance as low as possible.  
DOI • reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-THPOR001  
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THPOR002 Chromaticity Compensation Schemes for the Arc Lattice of the FCC-ee Collider 3763
SUPSS048   use link to see paper's listing under its alternate paper code  
 
  • B. Härer
    KIT, Karlsruhe, Germany
  • A. Doblhammer, B.J. Holzer
    CERN, Geneva, Switzerland
 
  FCC-ee is an 100 km e+/e collider that is being designed within the Future Circular Collider Study organised by CERN. It's layout is optimised for precision studies and rare decay observations in the range of 90 to 350 GeV center of mass energy with luminosities in the order of 1035 cm-2s-1. Extremely small vertical beta functions of 1 - 2 mm are required at the two interaction points to reach this goal. The strong focusing required in the final doublet quadrupoles drives the chromaticity to more than -2000 units, far beyond the values that had been achieved in previous storage rings. As a consequence a pure linear chromaticity compensation scheme will not be sufficient to obtain the required ± 2 % energy acceptance. A state of the art multi-family sextupole scheme will have to be combined with a local chromaticity correction. This paper presents the design of the arc lattice, optimised for highest momentum acceptance and the results of systematic studies of the sextupole scheme in the arcs in order to gain highest chromaticity performance.  
DOI • reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-THPOR002  
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THPOR003 Tapering Options and Emittance Fine Tuning for the FCC-ee Collider 3767
 
  • B. Härer, A. Doblhammer, B.J. Holzer
    CERN, Geneva, Switzerland
 
  The lepton collider version of the FCC study describes a future electron-positron collider with a circumference in the order of 100 km, optimised for operation with collision energies in the range of 90 GeV to 350 GeV (FCC- ee). This paper presents the layout of the machine and the constraints on the design of the arc lattice in the context of the four different beam energies that are foreseen for beam operation. Special emphasis is put on the compensation of the effect of the strong synchrotron radiation losses. The beam orbit as well as the optics have to be re-optimised for a given operation energy in order to achieve the foreseen emittance of ε = 1 nm in the horizontal and 1 pm in the vertical plane. Counter measures of the so-called saw-tooth effect of the design orbit are needed as well as a compensation of the energy loss on the beam optics. The paper summarizes different scenarios of how to achieve this goal as well as the need for additional emittance fine tuning using wiggler magnets.  
DOI • reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-THPOR003  
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THPOR022 Design of Beam Optics for the FCC-ee Collider Ring 3821
 
  • K. Oide, K. Ohmi, D. Zhou
    KEK, Ibaraki, Japan
  • M. Aiba
    PSI, Villigen PSI, Switzerland
  • S. Aumon, M. Benedikt, H. Burkhardt, A. Doblhammer, B. Härer, B.J. Holzer, J.M. Jowett, M. Koratzinos, L.E. Medina Medrano, Y. Papaphilippou, J. Wenninger, F. Zimmermann
    CERN, Geneva, Switzerland
  • A.P. Blondel
    DPNC, Genève, Switzerland
  • A.V. Bogomyagkov, I. Koop, E.B. Levichev, P.A. Piminov, D.N. Shatilov, D.B. Shwartz, S.V. Sinyatkin
    BINP SB RAS, Novosibirsk, Russia
  • M. Boscolo
    INFN/LNF, Frascati (Roma), Italy
  • Y. Cai, M.K. Sullivan, U. Wienands
    SLAC, Menlo Park, California, USA
 
  A design of beam optics will be presented for the FCC-ee double-ring collider. The main characteristics are 45 to 175 GeV beam energy, 100 km circumference with two IPs/ring, 30 mrad crossing angle at the IP, crab-waist scheme with local chromaticity correction system, and "tapering" of the magnets along with the local beam energy. An asymmetric layout near the interaction region suppresses the critical energy of synchrotron radiation toward the detector at the IP less than 100 keV, while keeping the geometry as close as to the FCC-hh beam line. A sufficient transverse/longitudinal dynamic aperture is obtained to assure the lifetime with beamstrahlung and top-up injection. The synchrotron radiation in all magnets, the IP solenoid and its compensation, nonlinearity of the final quadrupoles are taken into account.  
DOI • reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-THPOR022  
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THPOR023 The FCC-ee Interaction Region Magnet Design 3824
 
  • M. Koratzinos, A.P. Blondel
    DPNC, Genève, Switzerland
  • M. Benedikt, B.J. Holzer, F. Zimmermann, J. van Nugteren
    CERN, Geneva, Switzerland
  • A.V. Bogomyagkov, S.V. Sinyatkin
    BINP SB RAS, Novosibirsk, Russia
  • K. Oide
    KEK, Ibaraki, Japan
 
  The design of the region close to the interaction point of the FCC-ee experiments is especially challenging. The beams collide at an angle (±15 mrad) in the high-field region of the detector solenoid. Moreover, the very low vertical β* of the machine necessitates that the final focusing quadrupoles have a distance from the IP (L*) of around 2 m and therefore are inside the main detector solenoid. The beams should be screened from the effect of the detector magnetic field, and the emittance blow-up due to vertical dispersion in the interaction region should be minimized, while leaving enough space for detector components. Crosstalk between the two final focus quadrupoles, only about 6 cm apart at the tip, should also be minimized.  
DOI • reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-THPOR023  
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