WECL —  Machine Parameters Measurements II   (14-Sep-16   14:30—16:00)
Chair: Y.B. Leng, SSRF, Shanghai, People's Republic of China
Paper Title Page
WECL01 Longitudinal Phase Space Diagnostics for Ultrashort Bunches With a Plasma Deflector 597
  • I. Dornmair, A.R. Maier
    CFEL, Hamburg, Germany
  • I. Dornmair
    University of Hamburg, Hamburg, Germany
  • K. Flöttmann, B. Marchetti
    DESY, Hamburg, Germany
  • A.R. Maier
    University of Hamburg, Institut für Experimentalphysik, Hamburg, Germany
  • C.B. Schroeder
    LBNL, Berkeley, California, USA
  We present with simulations a new method to diagnose the longitudinal phase space of ultrashort electron bunches. It harnesses the strong transverse fields of laser-driven wakefields to streak an electron bunch that is injected off-axis with respect to the driver laser. Owed to the short plasma wavelength and the high field amplitude present in a plasma wakefield, a temporal resolution around or below the femtosecond can be achieved with a plasma length of a few millimeters. We will explore the limitations on the time resolution, the calibration, and the influence of error sources such as beam loading and jitters. Amongst the possible applications are experiments aiming at external injection into laser-driven wakefields, or the diagnostics of laser-plasma accelerated beams.  
slides icon Slides WECL01 [5.430 MB]  
DOI • reference for this paper ※ DOI:10.18429/JACoW-IBIC2016-WECL01  
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WECL02 Accurate Measurement of the MLS Electron Storage Ring Parameters 600
  • R. Klein, G. Brandt, T. Reichel, R. Thornagel
    PTB, Berlin, Germany
  • J. Feikes, M. Ries, I. Seiler
    HZB, Berlin, Germany
  The use of the Metrology Light Source (MLS), the electron storage ring of the Physikalisch-Technische Bundesanstalt (PTB, the German national metrology institute) as a primary radiation source standard requires the accurate measurement of all storage ring parameters needed for the calculation of the spectral radiant intensity of the synchrotron radiation. Therefore, instrumentation has been installed in the MLS for the measurement of, e.g., the electron beam energy, the electron beam current or the electron beam size that outperforms that usually installed in electron storage rings used as a common synchrotron radiation source. We report on the status and improvements in the storage ring parameter measurement.  
slides icon Slides WECL02 [6.998 MB]  
DOI • reference for this paper ※ DOI:10.18429/JACoW-IBIC2016-WECL02  
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WECL03 Measurement of the Beam Response to Quadrupole Kick by Using Stripline Pickup Monitor at J-PARC Main Ring 604
  • Y. Nakanishi, A. Ichikawa, A. Ichikawa, A. Minamino, K.G. Nakamura, T. Nakaya
    Kyoto University, Kyoto, Japan
  • T. Koseki, H. Kuboki, M. Okada, T. Toyama
    KEK, Tokai, Ibaraki, Japan
  Funding: Work supported by MEXT KAKENHI, GA 25105002, Grant-in-Aid for Scientific Research on Innovative Areas titled "Unification and Development of the Neutrino Science Frontier"
In high intensity proton synchrotrons, linear and nonlinear betatron resonances cause beam loss. When the betatron tune spreads over a resonance line, the oscillation amplitude will get larger, causing a large beam loss. Our study aims for a direct measurement of the betatron tune spread by using a quadrupole kicker and a 4-electrode monitor. The monochromatic rf signal is inputted to the kicker and we induce an oscillation by kicking the beam. The amplitude of the quadrupole oscillation will depend on the number of particles having a certain tune. In the beam test at J-PARC MR, the dipole kicker was used as a quadrupole kicker by exciting the two facing electrodes in-phase. We measured the response to the kick at several frequencies. We observed that the amplitude depends on the kicker frequency and the number of particles per bunch. This demonstrates that the quadrupole oscillation can be induced by a kicker and the possibility of measuring the number of a particular tune particle from the response. We will present the result of the beam test and our prospect and the comparison between the experimental result and a numerical calculation.
slides icon Slides WECL03 [2.054 MB]  
DOI • reference for this paper ※ DOI:10.18429/JACoW-IBIC2016-WECL03  
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