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  

Doebert, S.

Paper Title Page
WEPMN070 High Power Test of an X-band Slotted-Iris Accelerator Structure at NLCTA 2191
  • S. Doebert, R. Fandos, A. Grudiev, S. T. Heikkinen, J. A. Rodriguez, M. Taborelli, W. Wuensch
    CERN, Geneva
  • C. Adolphsen, L. Laurent
    SLAC, Menlo Park, California
  The CLIC study group at CERN has built two X-band HDS (Hybrid Damped Structure) accelerating structures for high-power testing in NLCTA at SLAC. These accelerating structures are novel with respect to their rf-design and their fabrication technique. The eleven-cell constant impedance structures, one made out of copper and one out of molybdenum, are assembled from clamped high-speed milled quadrants. They feature the same heavy higher-order-mode damping as nominal CLIC structures achieved by slotted irises and radial damping waveguides for each cell. The X-band accelerators are exactly scaled versions of structures tested at 30 GHz in the CLIC test facility, CTF3. The results of the X-band tests are presented and compared to those at 30 GHz to determine frequency scaling, and are compared to the extensive copper data from the NLC structure development program to determine material dependence and make a basic validation of the HDS design.  
THPMN063 CTF3 Combiner Ring Commissioning 2850
  • F. Tecker, R. Corsini, S. Doebert, P. K. Skowronski, P. Urschutz
    CERN, Geneva
  • C. Biscari, A. Ghigo
    INFN/LNF, Frascati (Roma)
  • E. Bressi
    CNAO Foundation, Milan
  • A. Ferrari
    UU/ISV, Uppsala
  CLIC Test Facility 3 (CTF3) has the objective to demonstrate the remaining feasibility issues of the CLIC two-beam technology for a future multi-TeV linear collider. One key issue is the efficient generation of a very high current 'drive beam' that serves as the power source for the acceleration of the main beam to high energy. This large current beam is produced by interleaving bunches in a combiner ring using transverse deflecting RF cavities. The 84 m long CTF3 combiner ring and the connecting transfer line have been recently installed and put into operation. The latest commissioning results will be presented.  
FROBC01 30 GHz High-Gradient Accelerating Structure Test Results 3818
  • J. A. Rodriguez, G. Arnau-Izquierdo, R. Corsini, S. Doebert, R. Fandos, A. Grudiev, I. Syratchev, M. Taborelli, F. Tecker, P. Urschutz, W. Wuensch
    CERN, Geneva
  • H. Aksakal, Z. Nergiz
    Ankara University, Faculty of Sciences, Tandogan/Ankara
  • M. Johnson
    UU/ISV, Uppsala
  • O. M. Mete
    Ankara University, Faculty of Engineering, Tandogan, Ankara
  The CLIC study is high power testing accelerating structures in a number of different materials and accelerating structure designs to understand the physics of breakdown, determine the appropriate scaling of performance and in particular to find ways to increase achievable accelerating gradient. The most recent 30 GHz structures which have been tested include damped structures in copper, molybdenum, titanium and aluminum. The results from these new structures are presented and compared to previous ones to determine dependencies of quantities such as achievable accelerating gradient, pulse length, power flow, conditioning rate and breakdown rate.  
slides icon Slides  
FRPMS045 Non-Destructive Single Shot Bunch Length Measurements for the CLIC Test Facility 3 4069
  • A. E. Dabrowski, M. Velasco
    NU, Evanston
  • H.-H. Braun, R. Corsini, S. Doebert, T. Lefevre, F. Tecker, P. Urschutz
    CERN, Geneva
  Funding: DOE

A non-destructive bunch length detector has been installed in the CLIC Test Facility (CTF3). Using a series of down-converting mixing stages and filters, the detector analyzes the power spectrum of the electromagnetic field picked-up by a single waveguide. This detector evolved from an earlier system which was regularly used for bunch length measurements in CTF2. Major improvements are increase of frequency reach from 90 GHz to 170 GHz, allowing for sub-pico second sensitivity, and single shot measurement capability using FFT analysis from large bandwidth waveform digitisers. The results of the commissioning of the detector in 2006 are presented.