Author: Pfingstner, J.
Paper Title Page
MOPOW036 Design Optimization of an X-band based FEL 793
  • A.A. Aksoy
    Ankara University, Accelerator Technologies Institute, Golbasi / Ankara, Turkey
  • A. Latina, J. Pfingstner, D. Schulte
    CERN, Geneva, Switzerland
  • Z. Nergiz
    Nigde University, Nigde, Turkey
  A design effort for a new generation of compact, cost-effective, power-efficient FEL facilities, based on X-band technology, has been launched. High-frequency X-band acceleration implies strong wakefields, tight alignment and mechanical tolerances, and challenging stability issues. In this paper a design is proposed for the injector and the linacs, including the two bunch compressors. RF gun and injector simulations have been performed, successfully meeting the stringent requirements in terms of minimum projected emittance, sliced emittance and minimum bunch length. In the design of the linac and bunch compressors wakefield effects and misalignment have been taken into account. Start-to-end tracking simulations through the optimized lattice are presented and discussed.  
DOI • reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-MOPOW036  
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WEPOR005 Ground Motion Compensation using Feed-forward Control at ATF2 2670
  • D.R. Bett, C. Charrondière, M. Patecki, J. Pfingstner, D. Schulte, R. Tomás
    CERN, Geneva, Switzerland
  • A. Jeremie
    IN2P3-LAPP, Annecy-le-Vieux, France
  • K. Kubo, S. Kuroda, T. Naito, T. Okugi, T. Tauchi, N. Terunuma
    KEK, Ibaraki, Japan
  Ground motion compensation using feed-forward control is a novel technique being developed to combat beam imperfections resulting from the vibration-induced misalignment of beamline components. The method is being evaluated experimentally at the KEK Accelerator Test Facility 2 (ATF2). It has already been demonstrated that the beam position correlates with the readings from a set of seismometers located along the beamline. To compensate for this contribution to the beam jitter, the fully operational system will use realtime measurement and processing in order to calculate and apply the feed-forward correction on a useful time scale. The progress towards a working system is presented in this paper.  
DOI • reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-WEPOR005  
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WEOBB02 Status of Wakefield Monitor Experiments at the CLIC Test Facility 2099
  • R.L. Lillestøl, E. Adli, J. Pfingstner
    University of Oslo, Oslo, Norway
  • N. Aftab, S. Javeed
    PINSTECH, Islamabad, Pakistan
  • R. Corsini, S. Döbert, W. Farabolini, A. Grudiev, W. Wuensch
    CERN, Geneva, Switzerland
  For the very low emittance beams in CLIC, it is vital to mitigate emittance growth which leads to reduced luminosity in the detectors. One factor that leads to emittance growth is transverse wakefields in the accelerating structures. In order to combat this the structures must be aligned with a precision of a few um. For achieving this tolerance, accelerating structures are equipped with wakefield monitors that measure higher-order dipole modes excited by the beam when offset from the structure axis. We report on such measurements, performed using prototype CLIC accelerating structures which are part of the module installed in the CLIC Test Facility 3 (CTF3) at CERN. Measurements with and without the drive beam that feeds rf power to the structures are compared. Improvements to the experimental setup are discussed, and finally remaining measurements that should be performed before the completion of the program are summarized.  
slides icon Slides WEOBB02 [2.928 MB]  
DOI • reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-WEOBB02  
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WEPMY009 Transverse Tolerances of a Multi-Stage Plasma Wakefield Accelerator 2561
SUPSS034   use link to see paper's listing under its alternate paper code  
  • C.A. Lindstrøm, E. Adli, J. Pfingstner
    University of Oslo, Oslo, Norway
  • E. Marín, D. Schulte
    CERN, Geneva, Switzerland
  Funding: This work is supported by the Research Council of Norway.
Plasma wakefield acceleration (PWFA) provides GeV/m-scale accelerating fields, ideal for applications such as a future linear collider. However, strong focusing fields imply that a transversely offset beam with an energy spread will experience emittance growth from the energy dependent betatron oscillation. We develop an analytic model for estimating tolerances from this effect, as well as an effective simplified simulation tool in Elegant. Estimations for a proposed 1 TeV PWFA linear collider scheme indicate tight tolerances of order 40 nm and 1 μrad in position and angle respectively.
DOI • reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-WEPMY009  
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WEPMY010 Considerations for a Drive Beam Scheme for a Plasma Wakefield Linear Collider 2565
  • J. Pfingstner, E. Adli, C.A. Lindstrøm
    University of Oslo, Oslo, Norway
  • E. Marín, D. Schulte
    CERN, Geneva, Switzerland
  The potential for high average gradients makes plasma wakefield acceleration (PWFA) an attracting option for future linear colliders. For a beam-driven PWFA collider a sequence of cells has to be supplied with synchronised drive beam bunches. This paper is concerned with the generation, transport and distribution of these drive beam bunches in a so-called drive beam complex for a 3 TeV collider. Based on earlier concepts, several modifications are suggested. The new design includes a superconducting linac and an optimised bunch delay system with a tree structure. To verify the feasibility for the overall complex, a lattice design and tracking studies for the critical bending arc subsystem are presented. Also the feasibility of a compact bunch separation system is shown. The result of these efforts is a drive beam complex that is optimised for construction cost and power efficiency that favours unified lattice solutions.  
DOI • reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-WEPMY010  
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