A   B   C   D   E   F   G   H   I   J   K   L   M   N   O   P   Q   R   S   T   U   V   W   X   Y   Z    

Ziemann, V.G.

Paper Title Page
MOPLS091 First Design of a Post Collision Line for CLIC at 3 TeV 765
 
  • V.G. Ziemann, T. J. C. Ekelof, A. Ferrari
    UU/ISV, Uppsala
  • P. Eliasson
    CERN, Geneva
  
  As part of the Post collision diagnostic task of the ILPS work-package of EuroTeV we discuss a design of the beam line between the interaction point and the beam dump for CLIC with a center-of-mass energy of 3 TeV. The design is driven by the requirement to transport the beam and all secondaries such as beamstrahlung and coherent pairs to the beam dump with minimal losses. Moreover, we discuss the integration of novel diagnostic methods into the post collision beam line based on the detection of coherent pairs and monitoring the beam profile of the primary beam.  
TUPCH081 Technical Aspects of the Integration of the Optical Replica Synthesizer for the Diagnostics of Ultra-short Bunches in FLASH at DESY 1199
 
  • V.G. Ziemann
    UU/ISV, Uppsala
  • N.X. Javahiraly, P. van der Meulen
    FYSIKUM, AlbaNova, Stockholm University, Stockholm
  • M. Larsson
    Stockholm University, Department of Physics, Stockholm
  • E. Saldin, H. Schlarb, E. Schneidmiller, A. Winter, M.V. Yurkov
    DESY, Hamburg
  
  In this paper we present an overview of current status of the Optical Replica synthesizer at DESY. The method is based on producing an "optical copy" of the electron bunch with its subsequent analysis with optical techniques*. To this end, a near-IR laser beam is superimposed on the electron beam in the first undulator of an optical klystron. In the following dispersive section the laser-induced energy modulation is transformed into a density modulation . The modulated electron bunch then produces a strong optical pulse in the second undulator. Analysis of this near-IR pulse (the optical copy) then provides information about the profile, the slice emittance and the slice energy spread of the electron bunch. We discuss the implementation of such a measurement set-up at the FLASH facility at DESY and investigate the influence of various parameters on the performance of the device. Topics we address include the dispersive chicane, as well as the requirements for the seed laser pulses and the detection and analysis of the near-IR pulse.

*E. Saldin, et al. "A simple method for the determination of the structure of ultrashort relativistic electron bunches," Nucl. Inst. and Methods A 539 (2005) 499.

 
TUPCH082 The EuroTeV Confocal Resonator Monitor Task 1202
 
  • V.G. Ziemann, T. J. C. Ekelof, A. Ferrari, M. A. Johnson, E. A. Ojefors, A. B. Rydberg
    UU/ISV, Uppsala
  • F. Caspers
    CERN, Geneva
  
  We describe the progress in the analysis of the confocal resonator monitor task which is part of the diagnostics workpackage of EuroTeV. The initial design was analyzed both numerically and experimentally and found limitations. We therefore digressed from strict confocality and report the numerical analysis and S-parameter measurements of a modified design. Furthermore, we discuss the mechanical design needed for planned tests with beam in CTF3 which requires integration of the monitor into the beam pipe, damping of trapped modes, and frequency tunability.  
WEPCH136 Monte Carlo Simulation Model of Internal Pellet Targets 2239
 
  • O.A. Bezshyyko, K.A. Bezshyyko, I.M. Kadenko, R.V. Yermolenko
    National Taras Shevchenko University of Kyiv, The Faculty of Physics, Kyiv
  • A. Dolinskii
    NASU/INR, Kiev
  • V.G. Ziemann
    UU/ISV, Uppsala
  
  We develop a numerical model of a pellet target and use it for Monte Carlo simulations of the interaction of a circulating beam with a pellet target. Real geometry details of the pellet beam and the beam are taken into account. We emphasize the role of tails of non-Gaussian distributions for transverse scattering and energy loss. These effects are especially important for simultaneous calculations of electron cooling, intrabeam scattering and target influence. Black-box algorithms for the generation of automatic nonuniform random variate distributions are used for the effective time averaging of scattering angle and energy loss distributions.  
WEPLS023 The Two-beam Test-stand in CTF3 2445
 
  • V.G. Ziemann, T. J. C. Ekelof, M. A. Johnson
    UU/ISV, Uppsala
  • H.-H. Braun, S. Doebert, G. Geschonke, J.P.H. Sladen, W. Wuensch
    CERN, Geneva
  
  The acceleration concept for CLIC, based on the two-beam acceleration scheme, where the 30 GHz RF power needed to accelerate the high energy beam is generated by a high-intensity but rather low energy drive beam, will be tested in the two-beam test-stand in CTF3. There RF-structures will be tested at full pulse length. The extreme power levels of up to 640 MW warrant a careful diagnostic system to analyze RF breakdown by observing the effect on both probe- and drive-beam but also the RF signals and secondary effects such as emitted light, vibrations, vacuum, temperatures. We describe the experimental setup and the diagnostic system planned to be installed in CTF3 for 2007.