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  

Skowronski, P.K.

Paper Title Page
MOP087 Status of Longitudinal Beam Dynamics Studies in CTF3 278
 
  • H. Shaker
    IPM, Tehran
  • E. Adli
    University of Oslo, Oslo
  • R. Corsini, A.E. Dabrowski, A. Latina, T. Lefèvre, H. Shaker, P.K. Skowronski, F. Tecker, P. Urschütz
    CERN, Geneva
 
 

The aim of the CLIC Test Facility CTF3, built at CERN by an international collaboration, is to address the main feasibility issues of the CLIC electron-positron linear collider technology by 2010. One key-issue studied in CTF3 is the generation of the very high current drive beam, used in CLIC as the rf power source. It is particularly important to simulate and control the drive beam longitudinal dynamics in the drive beam generation complex, since it directly affects the efficiency and stability of the rf power production process. In this paper we describe the ongoing effort in modelling the longitudinal evolution of the CTF3 drive beam and compare the simulations with experimental results.

 
TUP016 Status of an Automatic Beam Steering for the CLIC Test Facility 3 422
 
  • E. Adli, R. Corsini, A.E. Dabrowski, D. Schulte, H. Shaker, P.K. Skowronski, F. Tecker, R. Tomás
    CERN, Geneva
 
 

An automatic beam steering application for CTF 3 is being designed in order to automatize operation of the machine, as well as providing a test-bed for advanced steering algorithms for CLIC. Beam-based correction including dispersion free steering have been investigated. An approach based on a PLACET on-line model has been tested. This paper gives an overview of the current status and the achieved results of the CTF3 automatic steering.

 
TUP056 Beam Optics Studies and Commissioning Status of CTF3 530
 
  • P.K. Skowronski, S. Bettoni, R. Corsini, S. Döbert, F. Tecker
    CERN, Geneva
  • D. Alesini, C. Biscari
    INFN/LNF, Frascati (Roma)
  • Y.-C. Chao
    TRIUMF, Vancouver
 
 

The objective of the CLIC Test Facility CTF3 is to demonstrate the feasibility issues of the CLIC two-beam technology. CTF3 consists of an electron linac followed by a delay loop, a combiner ring and a two-beam test area. One issue studied in CTF3 is the efficient generation of a very high current drive beam, used in CLIC as the power source to accelerate the main beam to multi-TeV energies. The beam current is first doubled in the delay loop and then multiplied by a factor four in the combiner ring by interleaving bunches using transverse deflecting rf cavities. The combiner ring and the connecting transfer line have been put into operation in 2007. In this paper we give the status of the commissioning, present the results of the combination tests and illustrate in some detail the beam optics measurements, including response matrix analysis, dispersion measurement and applied orbit correction algorithms. We discuss as well the observation of a vertical beam break-up instability which is due to the vertical transverse mode in the horizontal rf deflectors used for beam injection and combination. We outline the attempted methods to mitigate the instability and their effectiveness.

 
TUP081 Transient Beam Loading Compensation in CTF3 585
 
  • A.E. Dabrowski, S. Bettoni, H.-H. Braun, E. Bravin, R. Corsini, S. Döbert, C. Dutriat, T. Lefèvre, M. Olvegård, P.K. Skowronski, F. Tecker
    CERN, Geneva
 
 

In the CLIC Test Facility 3 (CTF3), the strong coupling between the beam and the accelerating cavities (full beam loading) induces transient effects such that the head of the pulse is accelerated almost twice as much as the steady-state part of the pulse. The beam optics in the machine is tailored for the steady-state and not for the higher energy electrons, which are gradually lost. This can lead to inefficiency and contributes to the activation of the machine. A beam loading compensation scheme has been proposed to minimize this effect. By delaying appropriately the arrival time of rf pulse in accelerating cavities with respect to the beam, the transient energy can be brought close (to within a few percent) of the steady-state one. This paper presents the measurements done on CTF3 using time resolved energy measurements.

 
TUP082 Bunch Length Measurements in CTF3 588
 
  • A.E. Dabrowski, S. Bettoni, H.-H. Braun, R. Corsini, S. Döbert, T. Lefèvre, H. Shaker, P.K. Skowronski, F. Tecker
    CERN, Geneva
  • J.J. Jacobson, M. Velasco
    NU, Evanston
 
 

The CLIC Test Facility CTF3, being built at CERN by an international collaboration, should demonstrate the feasibility of the CLIC two-beam technology by 2010. One of the issues addressed is the control of the electron bunch length in the whole complex. A bunch length measurement system with good resolution is therefore paramount. Two different systems are presently used in CTF3, based on microwave spectroscopy and on transverse rf deflectors, respectively. In the paper we describe the two systems, we discuss the different experimental methods used and present the results of the latest measurement campaigns.