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A pair of superconducting transverse deflecting RF cavities has been studiedin the QBA low emittance lattices of the 3 GeV TPS for generating ultra shortX-ray pulses. Three configurations with different locations for the twocavities in a super-period of the TPS ring are investigated. During numerousturns of the electron tracking, the nonlinear effects between the cavities, theenergy spread, the momentum compaction factor, and the synchrotron radiationeffects are taken into account. The configuration with positioning the RFdeflectors between the QBA cells in each super-period as an optimum arrangementgives rise to better quality electron bunches and radiated photon pulses. TheFWHM of the radiated photon pulses of about 540 fs with an acceptable intensityis attained by optimizing the compression optical elements of the TPS photonbeam line. Furthermore, the effects of the electron bunch length are studied byalternatively employing an accelerating RF cavity operating with 1.1 MV and 3.0MV, respectively. The operation of the accelerating RF cavity at 3.0 MVimproved the intensity of the photon pulses up to 30% and reduced theequilibrium vertical emittance down to 70 pm-rad. The error tolerance for thedeflecting cavities, QBA lattice and injection process are also evaluated.

Utilization of the Transverse Deflecting RF Cavities in the Designed QBA Lattice of the 3 GeV Taiwan Photon Source