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- C. Kim, Y. W. Parc, J. Park
PAL, Pohang, Kyungbuk
- K. Hyun, I. S. Ko, C. Yim
POSTECH, Pohang, Kyungbuk
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A photocathode RF gun can provides a high-charge short-bunch-length electron beam, so that it can be used for an injector of the 4th generation light source. However, owing to the high-charge in short-bunch-length, generated electron beam experiences severe space-charge effect in the beginning of acceleration and the emittance becomes bad rapidly. To reduce this space-charge effect, we made a preliminary study of pulse shaping technique. First, Parmela simulations are performed to check the beam quality improvement when the plat-top profile laser is used. Given geometry of the photocathode RF gun in the Pohang Accelerator Laboratory, Parmela simulations show 40% decrease of the emittance in electron beams. Next, by stacking four Gaussian pulses to the longitudinal direction, we tried a generation of a plat-top profile laser, and its profile is checked with a cross-correlator.
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