WEBL —  Transverse Profile Monitors   (14-Sep-16   11:00—13:00)
Chair: T.M. Mitsuhashi, KEK, Ibaraki, Japan
Paper Title Page
WEBL01 Beam Diagnostics Challenges for Beam Dynamics Studies 577
  • O.R. Jones
    CERN, Geneva, Switzerland
  This presentation will review the performance and limitations of present beam instrumentation in relation to beam dynamics studies, and give an overview of the main requirements from the accelerator physics community for new or improved measurements that need R&D effort from the beam diagnostics side.  
slides icon Slides WEBL01 [47.201 MB]  
DOI • reference for this paper ※ DOI:10.18429/JACoW-IBIC2016-WEBL01  
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WEBL02 Beam Size Measurements Using Interferometry at LHC 583
  • G. Trad, E. Bravin, A. Goldblatt, S. Mazzoni, F. Roncarolo
    CERN, Geneva, Switzerland
  • T.M. Mitsuhashi
    KEK, Ibaraki, Japan
  During the long LHC shutdown 2013-2014, both the LHC and its injector chain underwent significant upgrades. The most important changes concerned increasing the maximum LHC beam energy from 4TeV to 6.5TeV and reducing the transverse emittance of the beam from the LHC injectors. These upgrades pose challenges to the measurement of the transverse beam size via Synchrotron Radiation (SR) imaging, as the radiation parameters approach the diffraction limit. Optical SR interferometry, widely used in synchrotron light facilities, was considered as an alternative method to measure the 150 'm rms beam size at top energy as it allows measurements below the diffraction limit. A system based on this technique was therefore implemented in the LHC, for the first time on a proton machine. This paper describes the design of the LHC interferometer and its two SR sources (a superconducting undulator at low energy and a bending dipole at high energy), along with the expected performance in terms of beam size measurement as compared to the imaging system. The world's first proton beam interferogram measured at the LHC will be shown and plans to make this an operational monitor will be presented.  
slides icon Slides WEBL02 [42.662 MB]  
DOI • reference for this paper ※ DOI:10.18429/JACoW-IBIC2016-WEBL02  
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WEBL03 Beam Shape Reconstruction Using Synchrotron Radiation Interferometry 589
  • L. Torino, U. Iriso
    ALBA-CELLS Synchrotron, Cerdanyola del Vallès, Spain
  Synchrotron Radiation Interferometry (SRI) through a double-aperture system is a well known technique to measure the transverse beam size using visible light. In many machines the beam is tilted in the transverse plane, but the SRI technique only allows to directly measure the size of the projection of the beam shape along the axis connecting the two apertures. A method to fully reconstruct the beam in the transverse plane using SRI has been developed and successfully tested at the ALBA synchrotron light source. This report shows the full beam reconstruction technique and presents the results at ALBA. Moreover, we also discuss how this technique could improve the measurement of very small beam sizes, improving the resolution of standard SRI.  
slides icon Slides WEBL03 [20.443 MB]  
DOI • reference for this paper ※ DOI:10.18429/JACoW-IBIC2016-WEBL03  
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WEBL04 The New Optical Device for Turn to Turn Beam Profile Measurement 593
  • V.L. Dorokhov
    BINP, Novosibirsk, Russia
  • A.D. Khilchenko, A.I. Kotelnikov, A.N. Kvashnin, O.I. Meshkov, P.V. Zubarev
    BINP SB RAS, Novosibirsk, Russia
  • V. Korchuganov, A.I. Stirin, A.G. Valentinov
    NRC, Moscow, Russia
  The electron beam quality determines the main synchrotron radiation characteristics therefore beam diagnostics is of great importance for synchrotron radiation source performance. The real-time processing of the electron beam parameters is a necessary procedure to optimize the key characteristics of the source using feedback loops. The frequency of electron beam cycling in the synchrotron storage ring is about 1 MHz. In multi-bunch mode electrons are grouped into a series of bunches. The bunch repetition frequency depends on the total number of bunches and usually reaches hundreds of MHz. The actual problem is to study the separate bunch dimensions behavior under multi-bunch beam instabilities. To solve this problem a turn-to-turn electron beam profile monitor is developed for Siberia-2 synchrotron light source. The linear avalanche photodiodes array is applied to imaging. The apparatus is able to record a transversal profile of selected bunches and analyze the dynamics of beam during 106 turns. The recent experimental results obtained with the diagnostics are described.  
slides icon Slides WEBL04 [4.282 MB]  
DOI • reference for this paper ※ DOI:10.18429/JACoW-IBIC2016-WEBL04  
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