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Ghasem, H.

Paper Title Page
WEPEA024 Bunch Lengthening Effects by Utilizing a Third Harmonic Cavity in Conjunction with Deflecting Cavities in TPS 2535
 
  • H. Ghasem
    IPM, Tehran
  • H. Hassanabadi
    Shahrood University of Technology, Shahrood
  • A. Mohammadzadeh
    NSTRI, Tehran
 
 

The effects of utilizing a third harmonic RF cavity in the lengthening mode have been investigated on quality of the electron beam and the emitted photons in the deflecting RF structures for TPS. For the obtained optimum synchronous and relative harmonic phases and harmonic voltage of 0.7 MV, the equilibrium horizontal and vertical emittances blow up as much as 13% and 97%, respectively. In addition, the intensity of the emitted X-ray pulses with 0.54 ps FWHM reduces by 30%.

 
WEPEA025 Utilization of Crab Cavities in the Designed QBA Lattice of Taiwan Photon Source 2538
 
  • H. Ghasem
    IPM, Tehran
  • G.-H. Luo
    NSRRC, Hsinchu
  • A. Mohammadzadeh
    NSTRI, Tehran
 
 

A pair of superconducting crab cavities has been studied in the QBA low emittance lattices of the 3 GeV TPS for generating ultra short X-ray pulses. Three configurations with different locations for the two cavities in a super-period of the TPS ring are investigated. The configuration with positioning the RF deflectors between the QBA cells in each super-period as an optimum arrangement gives rise to better quality electron bunches and radiated photon pulses. The FWHM of the radiated photon pulses of about 540 fs with an acceptable intensity is attained by optimizing the compression optical elements of the TPS photon beam line.