![]() ![]() While maintaining sufficiently high peak current of the electron beam around 3 kA, the optimal undulator tapering configuration (19 undulators are used) is determined and the phase shifter gap scanning process is also carried out. Such a good emittance is preserved up to the undulator line when the electron beam passes t h r ough the well-matched lattice. First of all, we achieve the lowest n o r m a l i z e d e m i ttance of the electron beam at the injector, which is 0.35 um in X-direction and 0.31 um in Y-direction, by op t i m i z ing the photocathode RF gun. It can be attainable by virtue of overall optimization of our machine. Recently, we record the PAL-XFEL’s highest pulse energy of 3.18 mJ at 7.13 keV photon energy, which corresponds to 2.8x10 12 photons per pulse. New record of the PAL-XFEL’s highest pulse energy This energy scanning using a narrow spectrum of hard X-ray will extend the capability in interdisciplinary science. The test experiments such as resonant inelastic X-ray scattering (RIXS) and X-ray emission spectroscopy (XES), femtosecond time resolved X-ray absorption near edge structure (TR-XANES), and serial femtosecond crystallography (SFX) have been carried out. The energy scanning program has been successfully performed for x-ray energy spectroscopy with the help of a double crystal monochromator (DCM), which results in improved spectral impurity and a fully calibrated energy scale. Furthermore, the averaged energy of seeded FEL is operating with an energy over 1 mJ/pulse from 5 keV to 10 keV. The outstanding performance of HXRSS FEL over the photon energy range covering from 3.5keV to 14.6keV have achieved. The right upper photograph and the right bottom one are hard X-ray FEL image and soft X-ray FEL captured by YAG screens, respectively, and the left bottom photographs show the branch area inside tunnel of PAL-XFEL.Įnergy scan using hard X-ray self-seeded FELĪlmost fully coherent hard X-ray self-seeded (HXRSS) free-electron laser (FEL) pulses with an unprecedented peak-brightness and a narrow spectrum using the forward Bragg-diffraction (FBD) monochromator have been successfully provided to the user community at PAL-XFEL. Layout of the newly installed HX-SX branch line in PAL-XFEL. In a near future this simultaneous hard and soft X-ray FEL operation scheme in PAL-XFEL will be applied to the actual beam time slots in PAL-XFEL to expand the opportunity of user experiments at PAL-XFEL.įigure 1. Recently, the first beamline FEL beam tests were conducted in simultaneous operation mode without severe degrade in FEL performance in both hard X-ray and soft X-ray. As shown in figure 1, this renewal branch line can switch the beam directions in several combinations of 60 Hz beam rate. PAL-XFEL has been upgrade to operate in the both modes simultaneously since the newly designed HX-SX branch line was installed during 2020 winter shutdown. PAL-XFEL is ready for simultaneous beam service of hard X-ray and soft X-ray
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