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Li, Z.

Paper Title Page
MOP028 Creation of Peaks in the Energy Spectrum of Laser-Produced Ions by Phase Rotation 97
 
  • A. Noda, H. Itoh, Y. Iwashita, S. Nakamura, T. Shirai, H. Souda, M. Tanabe, H. Tongu, A. Yamazaki
    Kyoto ICR, Uji, Kyoto
  • S. Bulanov, T. Kimura, A. Nagashima
    JAEA, Ibaraki-ken
  • H. Daido, Y. Hayashi, M. Kado, M. Mori, M. Nishiuchi, K. Ogura, S. Orimo, A. Sagisaka, A. Yogo
    JAEA/Kansai, Kizu-machi Souraku-gun Kyoto-fu
  • A. Fukumi, Z. Li, S. Yamada
    NIRS, Chiba-shi
  • T. Tajima
    JAEA/FEL, Ibaraki-ken
  
  Efficient acceleration of ions with use of very high electromagnetic field created by a high power laser has been paid attention because of its attainable very high acceleration gradient. Its intensity, however, has exponentially decreases according to the increase of its energy, which causes essential difficulty for its real application. For the quality improvement of laser-produced ions in their energy spreads, a scheme to apply an additional RF electric field synchronous to the pulse laser, called “Phase Rotation”,* has been applied to the ions produced from the thin foil target 3 and 5 mm, in thickness by irradiation of focused Ti:Sapphire laser with the wave length of 800 nm after optimization of the ion production process with use of real time observation of ion energy by TOF measurement.** Energy peaks with the spread of 7 % have been created in the energy spectrum at the positions depending on the relative phase between the pulse laser and the RF electric field. Possible application of “Phase Rotated” laser-produced ion beam is also to be discussed.

* A. Noda et al., Laser Physics, Vol. 16, No.4, pp.647-653(2006).
** S. Nakamura et al., to be submitted to Jpn. J. Appl. Phys.

 
TUP082 Development of a Parallel Finite Element Particle-In-Cell Code 450
 
  • A. E. Candel, A. C. Kabel, K. Ko, Z. Li, C. Limborg-Deprey, C.-K. Ng, G. L. Schussman, R. Uplenchwar
    SLAC, Menlo Park, California
  
  While electromagnetic field solvers have long progressed from structured to unstructured grids for superior resolution of geometric surfaces, almost all existing Particle-In-Cell (PIC) codes still employ the finite difference (FD) method based on structured grids. More recently, parallel implementations have allowed FD PIC codes to further reduce the mesh size for improved field accuracy, albeit at great computational cost. Under the DOE SciDAC program, SLAC has embarked on the development of a parallel PIC code that is formulated self consistently on the finite element (FE) grid. It uses higher-order basis functions for field representation and quadratic approximation of the boundaries. We will report on the progress of a 2D implementation, the comparison with FD PIC codes in efficiency and accuracy, and its application to the LCLS RF gun for which the effects of space charge and wakefields can be accurately computed for the first time. Parallelization strategies and the extension to the fully 3D case will be discussed.