Author: Boine-Frankenheim, O.
Paper Title Page
WEAM2X01
 PIC Solvers for Intense Beams: Status and Future Prospects  
 
  • O. Boine-Frankenheim
    GSI, Darmstadt, Germany
  
  Particle tracking codes employing Particle-In-Cell (PIC) techniques for the space charge forces are the standard tool for studies of incoherent and coherent effects in intense beams. The numerical noise inherent to the PIC scheme is a concern for accurate predictions of emittance growth and beam loss in synchrotrons and accumulator rings for high intensity. The predictions require long-term simulation including space charge forces obtained self-consistently. Besides the noise reduction, for long-term accuracy particle tracking schemes should also be symplectic. A novel class of multi-symplectic PIC integrators, originally developed for applications in plasma physics, promises bounded phase space motion together with noise reduction. For illustration a 2d symplectic space charge algorithm will be introduced and applied to a beam in a simple periodic focusing structure. The obtained noise characteristic, numerical emittance growth and performance will be compared to standard PIC schemes. Possible directions for future developments will be outlined.  
slides icon Slides WEAM2X01 [1.950 MB]  
Export • reference for this paper to ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)  
 
WEPM6X01
 Beam Halo Collimation Over Wide Range Charge-to-Mass Ratio  
 
  • I. Strašík, O. Boine-Frankenheim
    GSI, Darmstadt, Germany
  • O. Boine-Frankenheim
    TEMF, TU Darmstadt, Darmstadt, Germany
  
  We present a study of the halo collimation of ion beams from proton up to uranium in the projected FAIR heavy ion synchrotron SIS100. The design concepts are separated into fully stripped and partially stripped ion collimation. An application of the two stage betatron collimation system is intended for fully stripped ions and protons. Interaction of the particles with the primary collimator material was simulated using FLUKA. Particle tracking simulations and beam loss maps were obtained using MAD-X. The concept for the collimation of partially stripped ions is based on a stripping foil in order to change their charge state. These ions are subsequently deflected towards collimators using a quadrupole magnetic field. The charge state distribution of the stripped ions was calculated using GLOBAL. The particle tracking simulations downstream of the foil were performed using MAD-X. Inelastic nuclear interaction and consequently hadronic fragmentation and electromagnetic dissociation of heavy ions were simulated using FLUKA. The fragments with a significant abundance were tracked through the accelerator lattice and their contribution to the overall beam loss distribution was estimated.  
slides icon Slides WEPM6X01 [1.271 MB]  
Export • reference for this paper to ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)  
 
THPM3X01
 Head-Tail Instability and Landau Damping in Bunches with Space Charge  
 
  • V. Kornilov, O. Boine-Frankenheim
    GSI, Darmstadt, Germany
  
  Landau damping of the head-tail modes defines the impedance budget and the intensity limits for ring machine performance. The long-known source of the damping has been the octupole nonlinearity. So far, only the damping of the rigid mode k=0 has been modeled using a 2D dispersion relation. Recently, the transverse space-charge field has been identified as an important damping component. Quantitive estimations of the resulting Landau damping is still an open question, especially for the higher order modes. There is also a long-standing debate how to describe the head-tail frequency shifts due to coherent and due to incoherent effect in the stability calculations. We present a model for the Landau damping in bunches based on the concept of the collective mode positioning with respect to the incoherent spectrum. Secondly, we discuss an accurate description for the head-tail eigenfrequency shifts. The predictions and the physical understanding are verified using particle tracking simulations, and in particular by the experimental results.  
slides icon Slides THPM3X01 [1.745 MB]  
Export • reference for this paper to ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)  
 
THPM5X01 Using an Electron Cooler for Space Charge Compensation in the GSI Synchrotron SIS18 496
 
  • W.D. Stem, O. Boine-Frankenheim
    TEMF, TU Darmstadt, Darmstadt, Germany
  • O. Boine-Frankenheim
    GSI, Darmstadt, Germany
  
  Funding: Work is supported by BMBF contract FKZ:05P15RDRBA
For the future operation of the SIS18 as a booster synchrotron for the FAIR SIS100, space charge and beam lifetime are expected to be the main intensity limitations. Intensity is limited in part by the space-charge-induced incoherent tune shift in bunched beams. A co-propagating, low energy electron lens can compensate for this tune shift by applying opposing space-charge fields in the ion beam. In this paper, we study the effect of using the existing electron cooler at the SIS18 as a space charge compensation device. We anticipate beta beating may arise due to the singular localized focusing error, and explore the possibility of adding additional lenses to reduce this error. We also study the effect of electron lenses on the coherent (collective) and incoherent (single-particle) stopbands. Furthermore, we estimate the lifetime of partially stripped heavy-ions due to charge exchange process in the lens. 		 
slides icon Slides THPM5X01 [4.731 MB]  
Export • reference for this paper to ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)  
 
WEAM5X01 Beam-Dynamics Issues in the FCC 373
 
  • F. Zimmermann, W. Bartmann, M. Benedikt, M.I. Besana, R. Bruce, O.S. Brüning, X. Buffat, F. Burkart, H. Burkhardt, S. Calatroni, F. Cerutti, S.D. Fartoukh, M. Fiascaris, C. Garion, B. Goddard, B.J. Holzer, W. Höfle, J.M. Jowett, R. Kersevan, R. Martin, L. Mether, A. Milanese, T. Pieloni, S. Redaelli, G. Rumolo, B. Salvant, M. Schaumann, D. Schulte, E.N. Shaposhnikova, L.S. Stoel, C. Tambasco, R. Tomás, D. Tommasini
    CERN, Geneva, Switzerland
  • J.L. Abelleira, E. Cruz Alaniz, A. Seryi
    JAI, Oxford, United Kingdom
  • R.B. Appleby
    UMAN, Manchester, United Kingdom
  • P. Bambade, A. Faus-Golfe, J. Molson
    LAL, Orsay, France
  • J. Barranco
    EPFL, Lausanne, Switzerland
  • J.-L. Biarrotte, A. Lachaize
    IPN, Orsay, France
  • O. Boine-Frankenheim, U. Niedermayer
    TEMF, TU Darmstadt, Darmstadt, Germany
  • M. Boscolo, F. Collamati, A. Drago
    INFN/LNF, Frascati (Roma), Italy
  • A. Chancé
    CEA, Gif-sur-Yvette, France
  • B. Dalena, J. Payet
    CEA/IRFU, Gif-sur-Yvette, France
  • J.D. Fox, G. Stupakov
    SLAC, Menlo Park, California, USA
  • G. Guillermo Cantón
    CINVESTAV, Mérida, Mexico
  • S. Khan, B. Riemann
    DELTA, Dortmund, Germany
  • V. Kornilov
    GSI, Darmstadt, Germany
  • T.M. Mitsuhashi, K. Ohmi
    KEK, Ibaraki, Japan
  
  Funding: European Commission under the Capacities 7th Framework Programme project EuCARD-2, grant agreement 312453, and the HORIZON 2020 project EuroCirCol, grant agreement 654305. Also by the German BMBF.
The international Future Circular Collider (FCC) study is designing hadron, lepton and lepton-hadron colliders based on a new 100 km tunnel in the Geneva region. The main focus and ultimate goal of the study are high-luminosity proton-proton collisions at a centre-of-mass energy of 100 TeV, using 16 T Nb3Sn dipole magnets. Specific FCC beam dynamics issues are related to the large circumference, the high brightness - made available by radiation damping -, the small geometric emittance, unprecedented collision energy and luminosity, the huge amount of energy stored in the beam, large synchrotron radiation power, plus the injection scenarios. In addition to the FCC-hh proper, also a High-Energy LHC (HE-LHC) is being explored, using the FCC-hh magnet technology in the existing LHC tunnel, which can yield a centre-of-mass energy around 25 TeV. 		 
slides icon Slides WEAM5X01 [10.402 MB]  
Export • reference for this paper to ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)