Recent Progress of the PAL-XFEL after User Service Start

2021 ◽  
Vol 30 (5) ◽  
pp. 15-18
Author(s):  
Changbum KIM ◽  
Chi Hyun SHIM ◽  
Inhyuk NAM ◽  
Haeryong YANG ◽  
Chang-Ki MIN ◽  
...  
Keyword(s):  
Pulse Energy ◽  
Free Electron ◽  
Present Status ◽  
Free Electron Laser ◽  
Recent Progress ◽  
Beam Quality ◽  
X Ray ◽  
The Public ◽  
Pohang Accelerator Laboratory ◽  
Pal Xfel

The X-ray Free Electron Laser of the Pohang Accelerator Laboratory (PAL-XFEL) was open to the public in 2017 and started user service. Even after the user service had started, improvement of beam quality was continuously attempted, and several meaningful results were achieved. In this paper, we present recent progress in the PAL-XFEL, including the present status of its operation. The increase in the FEL pulse energy is explained, and the generation of a self-seeding FEL is described. In addition, the generation of a two-color FEL is mentioned.

scholarly journals Laser systems for time-resolved experiments at the Pohang Accelerator Laboratory X-ray Free-Electron Laser beamlines

2019 ◽  
Vol 26 (3) ◽  
pp. 868-873 ◽  
Author(s):  
Minseok Kim ◽  
Chang-Ki Min ◽  
Intae Eom
Keyword(s):  
Free Electron ◽  
Free Electron Laser ◽  
Near Infrared ◽  
Fundamental Wave ◽  
Regenerative Amplifier ◽  
X Ray ◽  
Laser Systems ◽  
Pohang Accelerator Laboratory ◽  
Optical Laser ◽  
Pal Xfel

Optical laser systems for ultrafast X-ray sciences have been established at the Pohang Accelerator Laboratory X-ray Free-Electron Laser (PAL-XFEL) beamlines. Three Ti:sapphire regenerative amplifier systems are synchronized to the XFEL with femtosecond precision, and the low temporal jitter of the PAL-XFEL results in an experimental time resolution below 150 fs (full width at half-maximum). A fundamental wave and its harmonics are currently provided for all beamlines, and tunable sources from ultraviolet to near-infrared are available for one beamline. The position stability of the optical laser extracted from the intensity-based center of mass at the sample position is less than 3% (r.m.s.) of the spot size.

scholarly journals Nanofocusing Optics for an X-Ray Free-Electron Laser Generating an Extreme Intensity of 100 EW/cm2 Using Total Reflection Mirrors

2020 ◽  
Vol 10 (7) ◽  
pp. 2611
Author(s):  
Hirokatsu Yumoto ◽  
Yuichi Inubushi ◽  
Taito Osaka ◽  
Ichiro Inoue ◽  
Takahisa Koyama ◽  
...  
Keyword(s):  
Photon Energy ◽  
Pulse Energy ◽  
Free Electron ◽  
Free Electron Laser ◽  
Total Reflection ◽  
Experimental Chamber ◽  
X Rays ◽  
X Ray ◽  
Set Up ◽  
Focused Beam

A nanofocusing optical system—referred to as 100 exa—for an X-ray free-electron laser (XFEL) was developed to generate an extremely high intensity of 100 EW/cm2 (1020 W/cm2) using total reflection mirrors. The system is based on Kirkpatrick-Baez geometry, with 250-mm-long elliptically figured mirrors optimized for the SPring-8 Angstrom Compact Free-Electron Laser (SACLA) XFEL facility. The nano-precision surface employed is coated with rhodium and offers a high reflectivity of 80%, with a photon energy of up to 12 keV, under total reflection conditions. Incident X-rays on the optics are reflected with a large spatial acceptance of over 900 μm. The focused beam is 210 nm × 120 nm (full width at half maximum) and was evaluated at a photon energy of 10 keV. The optics developed for 100 exa efficiently achieved an intensity of 1 × 1020 W/cm2 with a pulse duration of 7 fs and a pulse energy of 150 μJ (25% of the pulse energy generated at the light source). The experimental chamber, which can provide different stage arrangements and sample conditions, including vacuum environments and atmospheric-pressure helium, was set up with the focusing optics to meet the experimental requirements.

Stripline beam position monitor for X-ray free electron laser of Pohang Accelerator Laboratory

2019 ◽  
Vol 90 (9) ◽  
pp. 093306
Author(s):  
Changbum Kim ◽  
Sojeong Lee ◽  
Juho Hong ◽  
Dongchul Shin ◽  
Heung-Sik Kang ◽  
...  
Keyword(s):  
Free Electron ◽  
Free Electron Laser ◽  
Beam Position Monitor ◽  
Beam Position ◽  
X Ray ◽  
Pohang Accelerator Laboratory

scholarly journals Focusing X-ray free-electron laser pulses using Kirkpatrick–Baez mirrors at the NCI hutch of the PAL-XFEL

2018 ◽  
Vol 25 (1) ◽  
pp. 289-292 ◽  
Author(s):  
Jangwoo Kim ◽  
Hyo-Yun Kim ◽  
Jaehyun Park ◽  
Sangsoo Kim ◽  
Sunam Kim ◽  
...  
Keyword(s):  
Free Electron ◽  
Free Electron Laser ◽  
Laser Pulses ◽  
Mirror System ◽  
X Rays ◽  
X Ray ◽  
Fixed Sample ◽  
Scattering Geometry ◽  
Diffraction Imaging ◽  
Pal Xfel

The Pohang Accelerator Laboratory X-ray Free-Electron Laser (PAL-XFEL) is a recently commissioned X-ray free-electron laser (XFEL) facility that provides intense ultrashort X-ray pulses based on the self-amplified spontaneous emission process. The nano-crystallography and coherent imaging (NCI) hutch with forward-scattering geometry is located at the hard X-ray beamline of the PAL-XFEL and provides opportunities to perform serial femtosecond crystallography and coherent X-ray diffraction imaging. To produce intense high-density XFEL pulses at the interaction positions between the X-rays and various samples, a microfocusing Kirkpatrick–Baez (KB) mirror system that includes an ultra-precision manipulator has been developed. In this paper, the design of a KB mirror system that focuses the hard XFEL beam onto a fixed sample point of the NCI hutch, which is positioned along the hard XFEL beamline, is described. The focusing system produces a two-dimensional focusing beam at approximately 2 µm scale across the 2–11 keV photon energy range. XFEL pulses of 9.7 keV energy were successfully focused onto an area of size 1.94 µm × 2.08 µm FWHM.

scholarly journals For the generation of an intense isolated pulse in hard X-ray region using X-ray free electron laser

2012 ◽  
Vol 30 (3) ◽  
pp. 397-406 ◽  
Author(s):  
Sandeep Kumar ◽  
Heung-Sik Kang ◽  
Dong-Eon Kim
Keyword(s):  
Free Electron ◽  
Free Electron Laser ◽  
Electron Bunch ◽  
Attosecond Pulse ◽  
Current Profile ◽  
Distribution Profile ◽  
X Ray ◽  
Isolated Attosecond Pulse ◽  
Pump Probe Experiment ◽  
Pal Xfel

AbstractFor a real, meaningful pump-probe experiment with attosecond temporal resolution, an intense isolated attosecond pulse is in demand. For that purpose we report the generation of an intense isolated attosecond pulse, especially in X-ray region using a current-enhanced self-amplified spontaneous emission in a free electron laser (FEL). We use a few cycle laser pulse to manipulate the electron-bunch inside a two-period planar wiggler. In our study, we employ the electron beam parameters of Pohang Accelerator Laboratory (PAL)-XFEL. The RF phase effect of accelerator columns on the longitudinal energy distribution profile and current profile of electron-bunch is also studied, aiming that these results can be experimentally realized in PAL-XFEL. We show indeed that the manipulation of electron-energy bunch profile may lead to the generation of an isolated attosecond hard X-ray pulse: 150 attosecond radiation pulse at 0.1 nm wavelength can be generated.

scholarly journals A soft X-ray free-electron laser beamline at SACLA: the light source, photon beamline and experimental station

2018 ◽  
Vol 25 (1) ◽  
pp. 282-288 ◽  
Author(s):  
Shigeki Owada ◽  
Kazuaki Togawa ◽  
Takahiro Inagaki ◽  
Toru Hara ◽  
Takashi Tanaka ◽  
...  
Keyword(s):  
Electron Beam ◽  
Pulse Energy ◽  
Free Electron ◽  
Free Electron Laser ◽  
Beam Energy ◽  
Electron Beam Energy ◽  
X Ray ◽  
Experimental Station ◽  
And Performance ◽  
Source Test

The design and performance of a soft X-ray free-electron laser (FEL) beamline of the SPring-8 Compact free-electron LAser (SACLA) are described. The SPring-8 Compact SASE Source test accelerator, a prototype machine of SACLA, was relocated to the SACLA undulator hall for dedicated use for the soft X-ray FEL beamline. Since the accelerator is operated independently of the SACLA main linac that drives the two hard X-ray beamlines, it is possible to produce both soft and hard X-ray FEL simultaneously. The FEL pulse energy reached 110 µJ at a wavelength of 12.4 nm (i.e.photon energy of 100 eV) with an electron beam energy of 780 MeV.

scholarly journals Inline spectrometer for shot-by-shot determination of pulse energies of a two-color X-ray free-electron laser

2016 ◽  
Vol 23 (1) ◽  
pp. 331-333 ◽  
Author(s):  
Kenji Tamasaku ◽  
Yuichi Inubushi ◽  
Ichiro Inoue ◽  
Kensuke Tono ◽  
Makina Yabashi ◽  
...  
Keyword(s):  
Thin Film ◽  
Negative Correlation ◽  
Pulse Energy ◽  
Free Electron ◽  
Free Electron Laser ◽  
X Ray ◽  
The Absolute ◽  
Pulse Energies

An inline spectrometer has been developed to monitor shot-by-shot pulse energies of a two-color X-ray beam. A thin film of diamond allows inline operation with minimum absorption. The absolute pulse energy for each color is determined by the inline spectrometer combined with a total pulse-energy monitor. A negative correlation is found between the two-color pulse energies.

Soft X-ray harmonic lasing self-seeded free electron laser at Pohang Accelerator Laboratory X-ray free electron laser

2018 ◽  
Vol 112 (21) ◽  
pp. 213506 ◽  
Author(s):  
Inhyuk Nam ◽  
Chang-Ki Min ◽  
Changbum Kim ◽  
Haeryong Yang ◽  
Gyujin Kim ◽  
...  
Keyword(s):  
Free Electron ◽  
Free Electron Laser ◽  
X Ray ◽  
Pohang Accelerator Laboratory

Multifarious injection chamber for molecular structure study (MICOSS) system: development and application for serial femtosecond crystallography at Pohang Accelerator Laboratory X-ray Free-Electron Laser

2018 ◽  
Vol 25 (2) ◽  
pp. 323-328 ◽  
Author(s):  
Jaehyun Park ◽  
Seonghan Kim ◽  
Sangsoo Kim ◽  
Ki Hyun Nam
Keyword(s):  
Molecular Structure ◽  
Free Electron ◽  
Free Electron Laser ◽  
System Development ◽  
Diagnostic System ◽  
Experimental System ◽  
Structure Study ◽  
X Ray ◽  
Pohang Accelerator Laboratory ◽  
Serial Femtosecond Crystallography

The multifarious injection chamber for molecular structure study (MICOSS) experimental system has been developed at the Pohang Accelerator Laboratory X-ray Free-Electron Laser for conducting serial femtosecond crystallography. This system comprises several instruments such as a dedicated sample chamber, sample injectors, sample environment diagnostic system and detector stage for convenient distance manipulation. Serial femtosecond crystallography experiments of lysozyme crystals have been conducted successfully. The diffraction peaks have reached to ∼1.8 Å resolution at the photon energy of 9.785 keV.

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