Author: Latina, A.
Paper Title Page
MOPPC073 Improvements in the PLACET Tracking Code 301
  • A. Latina, E. Adli, D. Schulte, J. Snuverink
    CERN, Geneva, Switzerland
  • B. Dalena
    CEA/IRFU, Gif-sur-Yvette, France
  The tracking code PLACET simulates beam transport and orbit corrections in linear accelerators. It incorporates single- and multi-bunch effects, static and dynamic imperfections. It has an interface based on both Tcl/Tk and Octave to provide maximum flexibility and easy programming of complex scenarios. Recently, new functionality has been added to expand its simulation and tuning capabilities, such as: tools to perform beam-based alignment of non-linear optical systems, possibility to track through the interaction region in presence of external magnetic fields (detector solenoid), higher order imperfections in magnets, better tools for integrated feedback loops. Moreover, self contained frameworks have been created to ease the simulation of CLIC Drive Beam, CLIC Main Beam, and other existing electron machines such as CTF3 and FACET.  
MOPPC074 Evolution of MAD-X in the Framework of LHC Upgrade Studies 304
  • A. Latina, L. Deniau
    CERN, Geneva, Switzerland
  The design efforts for the High Luminosity upgrade of the Large Hadron Collider (HL-LHC) will require significant extensions of the MAD-X code widely used for designing and simulating particles accelerators. For this purpose, several new capabilities have been added to the code, namely the possibility to simulate crab cavities for crossing angle compensation, with their imperfections; the selective introduction of thick quadrupole elements for particles tracking, improving the previous implementation entirely based on thin-lenses; and the upgrade of the interface to SixTrack used for distributed tracking with, e.g., LHC@home. These changes are framed into a global redesign of the MAD-X architecture meant to consolidate its structure, improve its performances, and increase its flexibility. Such improvements are described in details in the present paper.  
TUPPR022 Traditional Final Focus System for CLIC 1858
  • H. Garcia, A. Latina, R. Tomás
    CERN, Geneva, Switzerland
  • H. Garcia
    UPC, Barcelona, Spain
  Next generation linear colliders needs a very strong focalisation to reach nanometer beam size at the Interaction Point. This task and the chromatic correction generated by the strong lenses is done by the Final Focus System. A traditional Final Focus System based on dedicated chromaticity correction sections is presented as an alternative for CLIC Final Focus. The scheme of the lattice is shown and some tolerances in the Final Doublet are calculated. A systematic tuning using Simplex algorithm and sextupole knobs is performed. The complete comparison to the Local Chromaticity correction scheme is presented.  
TUPPR029 Performance of Linear Collider Beam-Based Alignment Algorithms at FACET 1879
  • A. Latina, J. Pfingstner, D. Schulte
    CERN, Geneva, Switzerland
  • E. Adli
    University of Oslo, Oslo, Norway
  The performance of future linear colliders will depend critically on beam-based alignment (BBA) and feedback systems, which will play a crucial role both in the linear and in the non-linear systems of such machines, e.g., the linac and the final-focus. Due to its characteristics, FACET is an ideal test-bench for BBA algorithms and linear collider beam-dynamics in general. We present the results of extensive computer simulations and their experimental verification.  
TUPPR030 Thermo-mechanical Analysis of the CLIC Post-Linac Energy Collimators 1882
  • J. Resta-López
    IFIC, Valencia, Spain
  • J.L. Fernández-Hernando
    STFC/DL/ASTeC, Daresbury, Warrington, Cheshire, United Kingdom
  • A. Latina
    CERN, Geneva, Switzerland
  Funding: FPA2010-21456-C02-01
The post-linac energy collimation system of the Compact Linear Collider (CLIC) has been designed for passive protection of the Beam Delivery System (BDS) against mis-steered beams due to failure modes in the main linac. In this paper, a thermo-mechanical analysis of the CLIC energy collimators is presented. This study is based on simulations using the codes FLUKA and ANSYS when an entire bunch train hit the collimators. Different failure mode scenarios in the main linac are considered. Moreover, we discuss the results for different collimator materials. The aim is to improve the collimator design in order to make a reliable and robust design so that it survives without damage from the impact of a full bunch train in case of likely events generating energy errors.
TUPPR039 Beam Dynamics Studies for the CLIC Main Linac 1903
  • I. Nesmiyan, R.M. Jones
    UMAN, Manchester, United Kingdom
  • A. Latina, D. Schulte
    CERN, Geneva, Switzerland
  Implications of the long-range wakefield on beam quality are investigated through a detailed beam dynamics study. Injection offsets are considered and the resulting emittance dilution recorded, including systematic and random sources of error. These simulations have been conducted for damped and detuned structures (DDS) and for waveguide damped structures–both for the CLIC collider.  
WEPPR066 Effects of the External Wakefield from the CLIC PETS 3078
  • A. Latina, D. Schulte
    CERN, Geneva, Switzerland
  • J. Gao, Y. Wang
    IHEP, Beijing, People's Republic of China
  The CLIC main linac accelerating structures will be powered by the Power Extraction and Transfer Structure (PETS) located in the drive beam decelerators. Misalignments of the PETS will excite dipolar modes in the couplers of the main linac structures that will kick the beam leading to beam quality degradation. In this paper, the impact of such dipolar kicks is studied, and tolerances, based on analytical estimations, are found both in the single- and the multi-bunch regimes. Numerical simulation obtained using the tracking code PLACET are shown to confirm the analytical estimates.  
WEPPR067 Study of Fundamental Mode Multipolar Kicks in Double- and Single-feed Power Couplers for the CLIC Main Linac Accelerating Structure 3081
  • A. Latina, A. Grudiev, D. Schulte
    CERN, Geneva, Switzerland
  Multipolar kicks from the fundamental mode have been calculated in the CLIC baseline accelerating structure with double–feed input and output power couplers. The influence of such multipolar kicks on the main linac beam dynamics has been investigated. Furthermore, an alternative design of the couplers with single-feed has been studied and compared with the double-feed. Such an alternative would significantly simplify the waveguide system of the main linac but potentially introduce an harmful dipolar kick from the fundamental mode. The geometry of the coupler has been optimized in order to minimize such a dipolar kick and keep it below threshold levels determined with beam dynamics simulations. Influence of the higher order multipoles has been investigated as well and acceptable levels have been determined.  
THPPR038 Failure Studies at the Compact Linear Collider: Main Linac and Beam Delivery System 4056
  • C.O. Maidana, M. Jonker, A. Latina
    CERN, Geneva, Switzerland
  The proposed Compact Linear Collider (CLIC) is based on a two-beam acceleration scheme. The energy of two high-intensity, low-energy drive beams is extracted and transferred to two low-intensity, high-energy main beams. The machine protection and electrical integrity group has the mission to protect the various machine components from damage caused by ill controlled beams. Various failure scenarios were studied and the potential damage these failures could cause to the machine structures were estimated. In this paper, first results of the beam response to correctors and/or quadrupole kick failures in the main linac and in the beam delivery system (BDS) sections are presented as well as possible collimator damage scenarios. The use of the code PLACET for machine protection analysis is described as well.