Author: Gerbershagen, A.
Paper Title Page
MOPO017 Latest Performance Results from the FONT5 Intra-train Position and Angle Feedback System at ATF2 520
 
  • G.B. Christian, D.R. Bett, M.R. Davis, C. Perry
    JAI, Oxford, United Kingdom
  • R. Apsimon, P. Burrows
    Oxford University, Physics Department, Oxford, Oxon, United Kingdom
  • B. Constance, A. Gerbershagen
    CERN, Geneva, Switzerland
  • J. Resta-López
    IFIC, Valencia, Spain
 
  A prototype Interaction Point beam-based feedback system for future electron-positron colliders, such as the International Linear Collider, has been designed and tested on the extraction line of the KEK Accelerator Test Facility (ATF). The FONT5 intra-train feedback system aims to stabilize the beam orbit by correcting both the position and angle jitter in the vertical plane on bunch-to-bunch timescales, providing micron-level stability at the entrance to the ATF2 final-focus system. The system comprises three stripline beam position monitors (BPMs) and two stripline kickers, custom low-latency analogue front-end BPM processors, a custom FPGA-based digital processing board with fast ADCs, and custom kicker-drive amplifiers. An overview of the hardware, and the latest results from beam tests at ATF2, will be presented. A total system latency as low as approximately 140 ns has been demonstrated.  
 
TUPC013 Simulation of Phase Stability at the Flat Top of the CLIC Drive Beam 1018
 
  • A. Gerbershagen, D. Schulte
    CERN, Geneva, Switzerland
  • P. Burrows
    Oxford University, Physics Department, Oxford, Oxon, United Kingdom
 
  Funding: University of Oxford
The drive beam phase stability is one of the critical issues of the Compact Linear Collider (CLIC). In this paper the generation and propagation of drive beam phase errors is studied for effects that vary during the drive beam pulse. This includes the influence of drive beam current and phase errors as well as of drive beam accelerator RF phase and amplitude errors on the drive beam phase after the compressor chicanes and the analysis of the propagation of these errors through the drive beam combination scheme. The impact of the imperfections on the main beam is studied including the possible correction with help of a feedforward system.
 
 
TUPC157 Design and Initial Results of a Turn-by-Turn Beam Position Monitoring System for Multiple Bunch Operation of the ATF Damping Ring 1398
 
  • G.B. Christian, D.R. Bett, M.R. Davis, C. Perry
    JAI, Oxford, United Kingdom
  • R. Apsimon, P. Burrows
    Oxford University, Physics Department, Oxford, Oxon, United Kingdom
  • B. Constance, A. Gerbershagen
    CERN, Geneva, Switzerland
  • J. Resta-López
    IFIC, Valencia, Spain
 
  An FPGA-based monitoring system has been developed to study multi-bunch beam instabilities in the damping ring (DR) of the KEK Accelerator Test Facility (ATF), utilising a stripline beam position monitor (BPM) and existing BPM processor hardware. The system is designed to record the horizontal and/or vertical positions of up to three bunches in the DR in single-bunch multi-train mode or the head bunch of up to three trains in multi-bunch mode, with a bunch spacing of 5.6 ns. The FPGA firmware and data acquisition software were modified to record turn-by-turn data for up to six channels and 1–3 bunches in the DR. An overview of the system and initial results will be presented.