Author: Burkhardt, H.
Paper Title Page
MOPPC006 90m Optics Studies and Operation in the LHC 130
 
  • H. Burkhardt, G.J. Müller, S. Redaelli, R. Tomás, G. Vanbavinckhove, J. Wenninger
    CERN, Geneva, Switzerland
  • S. Cavalier
    LAL, Orsay, France
 
  A high β* = 90 m optics was commissioned and used for first very forward physics operation in the LHC in 2011. The experience gained from working with this optics in 5 studies and operation periods in 2011 was very positive. The target β* = 90 m was reached by a de-squeeze from the standard 11 m injection and ramp optics on the first attempt and collisions and first physics results obtained in the second study. The optics was measured and corrected with good precision. The running conditions were very clean and allowed for measurements with roman pots very close to the beam.  
 
MOPPC007 Plans for High Beta Optics in the LHC 133
 
  • H. Burkhardt, A. Macpherson
    CERN, Geneva, Switzerland
  • S. Cavalier, P.M. Puzo
    LAL, Orsay, France
 
  Based on what has been learned with the first high β* = 90 m operation in 2011, we describe the potential and practical scenarios for reaching very high β* in the LHC in 2012 and beyond. Very high β* optics require dedicated running time and conditions in the LHC. We describe a plan which is optimized to maximize the physics potential in a minimum of dedicated running time.  
 
MOPPC008 LHC Optics Determination with Proton Tracks Measured in the Roman Pots Detectors of the TOTEM Experiment 136
 
  • H. Niewiadomski, H. Burkhardt
    CERN, Geneva, Switzerland
  • F.J. Nemes
    KFKI, Budapest, Hungary
 
  The TOTEM experiment at the LHC is equipped with near beam movable devices – called Roman Pots (RP) – which detect protons scattered at the interaction point (IP) arrived to the detectors through the magnet lattice of the LHC. Proton kinematics at IP is reconstructed from positions and angles measured by the RP detectors, on the basis of the optical functions between IP and the RP locations. The precision of optics determination is therefore of the key importance for the experiment. TOTEM developed a novel method of machine optics determination making use of angle-position distributions of elastically scattered protons observed in the RP detectors. The method has been successfully applied to the data samples registered in 2010 and 2011. The studies have shown that the transport matrix could be estimated with a precision better than 1%.  
 
TUPPC036 Integration with the LHC of Electron Interaction Region Optics for a Ring-ring LHeC 1239
 
  • L.N.S. Thompson
    Cockcroft Institute, Warrington, Cheshire, United Kingdom
  • R. Appleby
    UMAN, Manchester, United Kingdom
  • N.R. Bernard
    ETH, Zurich, Switzerland
  • H. Burkhardt, B.J. Holzer
    CERN, Geneva, Switzerland
  • M. Fitterer
    KIT, Karlsruhe, Germany
  • M. Klein
    The University of Liverpool, Liverpool, United Kingdom
  • P. Kostka
    DESY Zeuthen, Zeuthen, Germany
 
  The Large Hadron Electron Collider (LHeC) project is a proposal to study e-p and e-A interactions at the LHC. One design uses an electron synchrotron to collide a 60GeV e± beam with the 7TeV proton beam. Designing a new accelerator around the existing LHC machine poses unique challenges, particularly in the interaction region (IR). The electron beam must be quickly separated from the proton beam after the interaction point (IP) to avoid beam-beam effects, while not significantly reducing luminosity or producing large amounts of synchrotron radiation. The proton beam must pass through the electron optics, while the electron beam must avoid the proton optics. The long straight section requires bending in both planes to counteract the IP crossing angle and to displace the beam vertically from the electron machine to the proton IP. An achromatic bending scheme is used in the vertical plane to eliminate dispersion at the IP and provide an optics which is well matched to the LHeC ring lattice. The interaction region and long straight section design is presented and detailed, and the design process and principles discussed.  
 
TUPPC037 Update on LHeC Ring-Ring Optics 1242
 
  • M. Fitterer
    KIT, Karlsruhe, Germany
  • O.S. Brüning, H. Burkhardt, B.J. Holzer, J.M. Jowett
    CERN, Geneva, Switzerland
  • M. Klein
    The University of Liverpool, Liverpool, United Kingdom
 
  An update of the LHeC Ring-Ring optics is presented which accounts for chromatic corrections and more flexibility in the tune adjustment.  
 
TUPPC079 Tracking LHC Models with Thick Lens Quadrupoles: Results and Comparisons with the Standard Thin Lens Tracking 1356
 
  • M. Giovannozzi, H. Burkhardt, T. Risselada
    CERN, Geneva, Switzerland
 
  So far, the massive numerical simulation studies of the LHC dynamic aperture were performed using thin lens models of the machine. This approach has the clear advantage of speed, but it has also the disadvantage of requiring re-matching of the optics from the real thick configuration to the thin one. Furthermore, as the figure-of-merit for the re-matching is the agreement between the beta-functions for the two model, while the quadrupole gradients are left free parameters, the effect of the magnetic multipoles might be affected by this approach and in turn the dynamic aperture computation. In this paper the new approach is described and the results for the dynamic aperture are compared with the old approach, including detailed considerations on the CPU-time requirements.