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| Type |
Poster Presentation |
| Area |
Physical Chemistry |
| Room No. |
Event Hall |
| Time |
4월 20일 (금요일) 11:00~12:30 |
| Code |
PHYS.P-180 |
| Subject |
Construction of a beamline for time-resolved x-ray research |
| Authors |
Seongheun Kim
Pohang Accelerator Laboratory, Pohang University of Science and Technology, Korea |
| Abstract |
Pohang Accelerator Laboratory (PAL) is currently starting to construct 1C beamline for time-resolved optical pump/ x-ray probe experiments. The operating radio frequency of PAL is ~ 499.9732 MHz and the synchrotron should provide 470 buckets with a revolution clock of ~ 1.0638 MHz and a bucket separation of 2.0 ns. Currently, the synchrotron is operated at full bunch mode with a nominal pulse duration of ~ 70 ps full width at half maximum that depends on the operation modes. PLS-II is typically operated in top-up mode with a current of 360 mA, which is equally distributed among all bunches for the respective filling pattern. The 1C beamline is a hard X-ray beamline covering the photon energy range from 2.3 up to 25 KeV and provides 1011 ~ 1012 photons/s depending on the operational energy. The commercial laser system is utilized to provide femtosecond pump laser pulses with ~ 35 fs pulse duration for photoexcitation of sample. The output pulse energies at a repetition rate of ~ 5 kHz are up to 3 mJ/pulse, 1 mJ/pulse, and 0.45 mJ/pulse for 800 nm, 400 nm, an 267 nm, respectively. To perform time-resolved X-ray experiment using synchrotron radiation, the synchronization of laser pulse and x-ray pulse has to be achieved. We have achieved the synchronization between the laser and synchrotron RF master clock (or synchrotron revolution clock). The 1C beamline will allow for experiments of time-resolved x-ray diffraction (XRD), time-resolved small-angle x-ray scattering (SAXS), and time-resolved x-ray absorption (XAS). Construction of the beamline will be completed at the end of 2020. |
| E-mail |
seonghkim@postech.ac.kr |
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121st General Meeting of the KCS