Author: Naito, T.
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MOPMB008 Modeling and Experimental Studies of Beam Halo at ATF2 88
SUPSS074   use link to see paper's listing under its alternate paper code  
 
  • R.J. Yang, P. Bambade, V. Kubytskyi
    LAL, Orsay, France
  • A. Faus-Golfe, N. Fuster-Martínez
    IFIC, Valencia, Spain
  • T. Naito
    KEK, Ibaraki, Japan
 
  The Accelerator Test Facility 2 (ATF2) at KEK is a prototype of the final focus system for the next generation of Future Linear Colliders(FCL). It aims to focus the beams to tens of nanometer transverse sizes and to provide stability at the few nm level. Achieving these goals requires modelling, measuring and suppressing of the transverse beam halo before the interaction point (IP). This paper presents a beam tail/halo generator based on realistic model and the investigation of vertical and horizontal beam tail/halo distribution at ATF2.  
DOI • reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-MOPMB008  
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WEPOR005 Ground Motion Compensation using Feed-forward Control at ATF2 2670
 
  • D.R. Bett, C. Charrondière, M. Patecki, J. Pfingstner, D. Schulte, R. Tomás
    CERN, Geneva, Switzerland
  • A. Jeremie
    IN2P3-LAPP, Annecy-le-Vieux, France
  • K. Kubo, S. Kuroda, T. Naito, T. Okugi, T. Tauchi, N. Terunuma
    KEK, Ibaraki, Japan
 
  Ground motion compensation using feed-forward control is a novel technique being developed to combat beam imperfections resulting from the vibration-induced misalignment of beamline components. The method is being evaluated experimentally at the KEK Accelerator Test Facility 2 (ATF2). It has already been demonstrated that the beam position correlates with the readings from a set of seismometers located along the beamline. To compensate for this contribution to the beam jitter, the fully operational system will use realtime measurement and processing in order to calculate and apply the feed-forward correction on a useful time scale. The progress towards a working system is presented in this paper.  
DOI • reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-WEPOR005  
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THPMB043 Progress in Ultra-Low β* Study at ATF2 3335
 
  • M. Patecki, D.R. Bett, F. Plassard, R. Tomás
    CERN, Geneva, Switzerland
  • K. Kubo, S. Kuroda, T. Naito, T. Okugi, T. Tauchi, N. Terunuma
    KEK, Ibaraki, Japan
  • M. Patecki
    Warsaw University of Technology, Warsaw, Poland
  • T. Tauchi, N. Terunuma
    Sokendai, Ibaraki, Japan
 
  A nanometer beam size in the interaction point (IP) is required in case of future linear colliders for achieving the desired rate of particle collisions. KEK Accelerator Test Facility (ATF2), a scaled down implementation of the beam delivery system (BDS), serves for investigating the limits of electron beam focusing at the interaction point. The goal of the ultra-low beta∗ study is to lower the IP vertical beam size by lowering the betay∗ value while keeping the betax∗ value unchanged. Good control over the beam optics is therefore required. The first experience with low beta∗ optics revealed a mismatch between the optics designed in the model with respect to the beam parameters observed in the experiment. Additionally, existing methods of beam parameters characterization at the IP were biased with high uncertainties making it difficult to set the desired optics. In this paper we report on the new method introduced in ATF2 for IP beam parameters characterization which gives a good control over the applied optics and makes the ultra-low beta∗ study possible to conduct. It can be also used for verifying the performance of some of the existing beam instrumentation devices.  
DOI • reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-THPMB043  
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THPOR045 Analytical Estimation of ATF Beam Halo Distribution 3888
 
  • D. Wang, J. Gao
    IHEP, Beijing, People's Republic of China
  • P. Bambade
    LAL, Orsay, France
  • T. Naito
    KEK, Ibaraki, Japan
 
  Funding: Work supported by the National Foundation of Natural Sciences (11505198 and 11575218)
Halo distribution is a key topic for background study. This paper has developed an analytical method to give an estimation of ATF beam halo distribution. The equilibrium particle distribution of the beam tail in the ATF damping ring is calculated analytically with different emittance and different vacuum degree. The analytical results agree the measurements very well. This is a general method which can be applied to any electron rings.
 
DOI • reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-THPOR045  
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