Bonggi Oh
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View article: New beam dynamics code for cyclotron analysis
New beam dynamics code for cyclotron analysis Open
This paper describes the beam dynamic simulation with transfer matrix method for four sector cyclotron. Starting from a description on the equation of motion in the cyclotron, lattice functions were determined from transfer matrix method a…
View article: Benchmark study and thermal-load analysis for soft X-ray beamline of Korea fourth-generation storage ring
Benchmark study and thermal-load analysis for soft X-ray beamline of Korea fourth-generation storage ring Open
The Korea fourth-generation storage ring (Korea-4GSR) has a low electron beam emittance of 60 p.m.-rad, and provides a photon beam that is 100 times brighter and 100 times more coherent than the third-generation Pohang Light Source (PLS-II…
View article: Concurrent operation of round beam and flat beam in a low-emittance storage ring
Concurrent operation of round beam and flat beam in a low-emittance storage ring Open
In 4th-generation storage rings, whether to operate the beam as round or flat is a critical question. A round beam has equal horizontal and vertical emittances, and is an efficient solution to reduce strong intra-beam scattering effects an…
View article: Concurrent Operation of Round Beam and Flat Beam in a Low- Emittance Storage Ring
Concurrent Operation of Round Beam and Flat Beam in a Low- Emittance Storage Ring Open
In 4th-generation storage rings, whether to operate the beam as round or flat is a critical question. A round beam has equal horizontal and vertical emittances, and is an efficient solution to reduce strong intra-beam scattering effects an…
View article: Investigation of the damping wiggler effect and application on the PAL fourth-generation storage ring
Investigation of the damping wiggler effect and application on the PAL fourth-generation storage ring Open
An investigation of the damping wiggler effect to reduce the emittance in the Pohang Accelerator Laboratory (PAL), a fourth-generation storage ring (4GSR) that uses a multi-bend achromat, is presented. A 4GSR lattice which has reduced emit…
View article: High-Brightness Self-seeded X-ray Free Electron Laser to Precisely Map Macromolecular Structure
High-Brightness Self-seeded X-ray Free Electron Laser to Precisely Map Macromolecular Structure Open
We demonstrate a hard-X-ray self-seeded (HXRSS) free-electron laser (FEL) at Pohang Accelerator Laboratory with an unprecedented peak brightness (3.2 × 1035 photons/(s·mm2·mrad2·0.1%BW)). The self-seeded FEL generates hard X-ray pulses wit…
View article: Demonstration of a ring-FEL as an EUV lithography tool
Demonstration of a ring-FEL as an EUV lithography tool Open
This paper presents the required structure and function of a ring-FEL as a radiation source for extreme ultraviolet radiation lithography (EUVL). A 100 m-long straight section that conducts an extremely low emittance beam from a fourth-gen…
View article: Hard X-ray self-seeding commissioning at PAL-XFEL
Hard X-ray self-seeding commissioning at PAL-XFEL Open
A wake monochromator based on a large-area diamond single crystal for hard X-ray self-seeding has been successfully installed and commissioned in the hard X-ray free-electron laser (FEL) at the Pohang Accelerator Laboratory with internatio…
View article: Mechanical Design of a Diamond Crystal Hard X-Ray Self-Seeding Monochromator for PAL-XFEL
Mechanical Design of a Diamond Crystal Hard X-Ray Self-Seeding Monochromator for PAL-XFEL Open
As a part of the Argonne Strategic Partnership Project (SPP) 85H21, a collaboration between Advanced Photon Source (APS), Argonne National Laboratory (ANL) and Pohang Accelerator Laboratory (PAL), we have designed, constructed, and tested …
View article: Adjusting Mechanism of Inter-Undulator Section for PAL XFEL
Adjusting Mechanism of Inter-Undulator Section for PAL XFEL Open
Pohang Accelerator Laboratory (PAL) has developed a SASE X-ray Free Electron Laser based on 10 GeV linear accelerator. The inter-Undulator (IU) support section was developed to be used in the intersections of the Undulator Systems. The IU …
View article: Construction and Commissioning of PAL-XFEL Facility
Construction and Commissioning of PAL-XFEL Facility Open
The construction of Pohang Accelerator Laboratory X-ray Free-Electron Laser (PAL-XFEL), a 0.1-nm hard X-ray free-electron laser (FEL) facility based on a 10-GeV S-band linear accelerator (LINAC), is achieved in Pohang, Korea by the end of …
View article: Diagnostic Systems for the PAL-XFEL Commissioning
Diagnostic Systems for the PAL-XFEL Commissioning Open
In 2011, an X-ray Free-Electron-Laser project was started in the Pohang Accelerator Laboratory (PAL-XFEL). The construction of the PAL-XFEL was finished at the end of 2015, and the commissioning was started from April 2016. The electron be…
View article: Technical Overview of Inter-Undulator Support System for PAL XFEL
Technical Overview of Inter-Undulator Support System for PAL XFEL Open
Pohang Accelerator Laboratory (PAL) has been developing a SASE X-ray Free Electron Laser based on 10 GeV linear accelerator. The inter-Undulator (IU) support system was developed to be used in the intersections of the Undulator Systems. Th…
View article: Diagnostic Systems of the PAL-XFEL
Diagnostic Systems of the PAL-XFEL Open
The Pohang Accelerator Laboratory (PAL) started an x-ray free electron laser project (PAL-XFEL) in 2011. The construction was finished at the end of 2015 and the commissioning is planned from the beginning of 2016. In the PAL-XFEL, an elec…
View article: PAL-XFEL Magnet Design and Magnetic Measurement
PAL-XFEL Magnet Design and Magnetic Measurement Open
We have designed and tested magnets for PAL-XFEL of 10GeV in Pohang, Korea. These magnets consist of 6 families of 52 dipole magnets, 11 families of 236 quadrupole magnets, and 4 families of 10⁸ corrector magnets. Two hall probe benches ar…
View article: Development of an X-Band Linearizer System for PAL-XFEL
Development of an X-Band Linearizer System for PAL-XFEL Open
We developed an X-band RF system for the linear bunch compression in the PAL-XFEL. We installed a SLAC X-band accelerating structure on a precise mover stage and applied RF power by using a SLAC XL-4 11.424 GHz klystron driven by an invert…
View article: Development of PAL-XFEL Undulator System
Development of PAL-XFEL Undulator System Open
Pohang Accelerator Laboratory (PAL) is developing a 0.1 nm SASE based FEL based on 10 GeV S-band linear accelerator named PAL-XFEL. At the first stage, PAL-XFEL needs two undulator lines for photon source. The hard X-ray undulator line req…
View article: Micro-mover Development and Test in the PAL-XFEL
Micro-mover Development and Test in the PAL-XFEL Open
Two micro-movers, which are able to control the horizontal, vertical and longitudinal positions as well as the yaw and pitch angles remotely, were developed and installed in the PAL-XFEL linac. The solenoid micro-mover in the gun section a…
View article: Technical Overview of Cavity BPM Mover for PAL XFEL
Technical Overview of Cavity BPM Mover for PAL XFEL Open
Pohang Accelerator Laboratory(PAL) has been developing a SASE X-ray Free Electron Laser based on 10 GeV linear accelerator. The cavity BPM mover was developed to be used in the intersections of the Undulator Systems. The main specification…
View article: Updates of the PAL-XFEL Undulator Program
Updates of the PAL-XFEL Undulator Program Open
Pohang Accelerator Laboratory (PAL) is developing a 0.1 nm SASE based FEL based on 10 GeV S-band linear accelerator named PAL-XFEL. At the first stage, PAL-XFEL needs two undulator lines for photon source. The hard X-ray undulator line req…