FEL2012 - List of Authors (Kang, H.-S.)

Paper	Title	Page
MOPD41	Low Emittance Injector Development for the PAL-XFEL Project	121
	J.H. Han, J.H. Hong, I. Hwang, H.-S. Kang, I.S. Ko, S.J. Park PAL, Pohang, Kyungbuk, Republic of Korea M.S. Chae POSTECH, Pohang, Kyungbuk, Republic of Korea
	Funding: The Ministry of Education, Science and Technology of the Korean Government An injector designed for low emittance beam generation as well we high repetition rate and more reliable operation is under development at PAL. By adopting a coaxial high power RF coupler at the gun exit, the gun solenoid can be positioned at an optimum location for low emittance and the cooling water channels can fully surround the gun cavity cylinder for high cooling capacity. With an exchangeable photocathode plug, high quantum efficiency cathode can be used for reducing the drive-laser power requirement and a damaged cathode can be easily replaced with a fresh one. Injector beam dynamics optimization with this gun is presented.

MOPD42	Microbunching Instability Study for the PAL-XFEL Linac	125
	J.H. Han, I. Hwang, H.-S. Kang PAL, Pohang, Kyungbuk, Republic of Korea
	Funding: The Ministry of Education, Science and Technology of the Korean Government PAL-XFEL is designed to generate X-ray FEL radiation in a range of 0.1 and 10 nm for users. The machine consists of a 10 GeV linear accelerator and five undulator beamlines. An electron beam is generated at a low emittance S-band photocathode RF gun and accelerated through an S-band normal conducting linac. Microbunching instability may occur when the beam goes through magnetic bunch compressors and beam spreaders. We discuss microbunching instability issues at PAL-XFEL.

MOPD43	New RF-Gun Design for The PAL-XFEL	129
	J.H. Hong, K.H. Gil, J.H. Han, H.-S. Kang, S.J. Park PAL, Pohang, Kyungbuk, Republic of Korea M.S. Chae, I.S. Ko POSTECH, Pohang, Kyungbuk, Republic of Korea
	We are developing an S-band photocathode RF-gun for the X-ray free electron laser (XFEL) at the Pohang Accelerator Laboratory (PAL). This RF-gun is a 1.6-cell RF-gun with dual-feed waveguide ports and two pumping ports. We have done the complete RF and thermal analysis of a new gun. The new RF-gun is designed to operate at a maximum field gradient of 130MV/m with a RF pulse width of 3 μs, a repetition rate of 120Hz. In this paper we present features and RF simulation results and thermal analysis results.

MOPD44	Design of Magnets for PAL-XFEL	133
	H.S. Suh, M.-H. Cho, H.S. Han, J.Y. Huang, S.T. Jung, Y.-G. Jung, H.-S. Kang, D.E. Kim, I.S. Ko, H.-G. Lee, T.-Y. Lee, K.-H. Park PAL, Pohang, Kyungbuk, Republic of Korea
	Pohang Accelerator Laboratory (PAL) is starting the X-ray Free Electron Laser of 10 GeV. PAL-XFEL has the hard X-ray and soft X-ray branches. The linac contains dipole magnets, quadrupole magnets and corrector magnets. The kicker magnet followed by the septum magnet is needed to extract the beam from the linac to the soft X-ray undulator line. In this presentation, we describe the design and analysis of the magnets.

TUPD34	Beam Optics Design for PAL-XFEL	309
	H.-S. Kang, J.H. Han, T.-H. Kang, I.S. Ko PAL, Pohang, Kyungbuk, Republic of Korea
	The PAL XFEL lattice is a three bunch compressor lattice (3-BC lattice) with a hard x-ray FEL line at the end of 10-GeV linac and a switch line at 3-GeV point for soft X-ray FEL line. The 3-BC lattice is chosen to minimize emittance growth due to CSR. Robustness of beam optics is verified with initial conditions far from ideal like asymmetric current profile, optics mismatch, nonlinear energy chirp.

THPD28	Beam Diagnostic Systems for PAL-XFEL	598
	C. Kim, H. J. Choi, J.Y. Choi, J.Y. Huang, H.-S. Kang, D.T. Kim, B.-J. Lee, C.-K. Min PAL, Pohang, Kyungbuk, Republic of Korea
	Funding: Korean Ministry of Education, Science and Technology The XFEL project in Pohang Accelerator Laboratory (PAL) requires low beam-emittance (< 1 μm·rad), ultra-short bunch length (25 μm ~80 fs), high peak current(~3.5 kA), high stability of beam energy (< 0.01%), and measurement and steering of beam trajectory within micrometers (< 2 μm). Therefore, beam diagnostics for SASE XFEL should be, focused on attaining femto-second precision in the measurement of temporal beam parameters, and sub-micrometer precision in beam position measurement. Charge measurement and energy measurement are important as well. In this work, technical concepts regarding the diagnostic monitors will be summarized and present status of them will be described.

Paper

Title

Page

Low Emittance Injector Development for the PAL-XFEL Project

121

J.H. Han, J.H. Hong, I. Hwang, H.-S. Kang, I.S. Ko, S.J. Park
PAL, Pohang, Kyungbuk, Republic of Korea
M.S. Chae
POSTECH, Pohang, Kyungbuk, Republic of Korea

Funding: The Ministry of Education, Science and Technology of the Korean Government
An injector designed for low emittance beam generation as well we high repetition rate and more reliable operation is under development at PAL. By adopting a coaxial high power RF coupler at the gun exit, the gun solenoid can be positioned at an optimum location for low emittance and the cooling water channels can fully surround the gun cavity cylinder for high cooling capacity. With an exchangeable photocathode plug, high quantum efficiency cathode can be used for reducing the drive-laser power requirement and a damaged cathode can be easily replaced with a fresh one. Injector beam dynamics optimization with this gun is presented.

MOPD42

Microbunching Instability Study for the PAL-XFEL Linac

125

J.H. Han, I. Hwang, H.-S. Kang
PAL, Pohang, Kyungbuk, Republic of Korea

Funding: The Ministry of Education, Science and Technology of the Korean Government
PAL-XFEL is designed to generate X-ray FEL radiation in a range of 0.1 and 10 nm for users. The machine consists of a 10 GeV linear accelerator and five undulator beamlines. An electron beam is generated at a low emittance S-band photocathode RF gun and accelerated through an S-band normal conducting linac. Microbunching instability may occur when the beam goes through magnetic bunch compressors and beam spreaders. We discuss microbunching instability issues at PAL-XFEL.

MOPD43

New RF-Gun Design for The PAL-XFEL

129

J.H. Hong, K.H. Gil, J.H. Han, H.-S. Kang, S.J. Park
PAL, Pohang, Kyungbuk, Republic of Korea
M.S. Chae, I.S. Ko
POSTECH, Pohang, Kyungbuk, Republic of Korea

We are developing an S-band photocathode RF-gun for the X-ray free electron laser (XFEL) at the Pohang Accelerator Laboratory (PAL). This RF-gun is a 1.6-cell RF-gun with dual-feed waveguide ports and two pumping ports. We have done the complete RF and thermal analysis of a new gun. The new RF-gun is designed to operate at a maximum field gradient of 130MV/m with a RF pulse width of 3 μs, a repetition rate of 120Hz. In this paper we present features and RF simulation results and thermal analysis results.

MOPD44

Design of Magnets for PAL-XFEL

133

H.S. Suh, M.-H. Cho, H.S. Han, J.Y. Huang, S.T. Jung, Y.-G. Jung, H.-S. Kang, D.E. Kim, I.S. Ko, H.-G. Lee, T.-Y. Lee, K.-H. Park
PAL, Pohang, Kyungbuk, Republic of Korea

Pohang Accelerator Laboratory (PAL) is starting the X-ray Free Electron Laser of 10 GeV. PAL-XFEL has the hard X-ray and soft X-ray branches. The linac contains dipole magnets, quadrupole magnets and corrector magnets. The kicker magnet followed by the septum magnet is needed to extract the beam from the linac to the soft X-ray undulator line. In this presentation, we describe the design and analysis of the magnets.

TUPD34

Beam Optics Design for PAL-XFEL

309

H.-S. Kang, J.H. Han, T.-H. Kang, I.S. Ko
PAL, Pohang, Kyungbuk, Republic of Korea

The PAL XFEL lattice is a three bunch compressor lattice (3-BC lattice) with a hard x-ray FEL line at the end of 10-GeV linac and a switch line at 3-GeV point for soft X-ray FEL line. The 3-BC lattice is chosen to minimize emittance growth due to CSR. Robustness of beam optics is verified with initial conditions far from ideal like asymmetric current profile, optics mismatch, nonlinear energy chirp.

THPD28

Beam Diagnostic Systems for PAL-XFEL

598

C. Kim, H. J. Choi, J.Y. Choi, J.Y. Huang, H.-S. Kang, D.T. Kim, B.-J. Lee, C.-K. Min
PAL, Pohang, Kyungbuk, Republic of Korea

Funding: Korean Ministry of Education, Science and Technology
The XFEL project in Pohang Accelerator Laboratory (PAL) requires low beam-emittance (< 1 μm·rad), ultra-short bunch length (25 μm ~80 fs), high peak current(~3.5 kA), high stability of beam energy (< 0.01%), and measurement and steering of beam trajectory within micrometers (< 2 μm). Therefore, beam diagnostics for SASE XFEL should be, focused on attaining femto-second precision in the measurement of temporal beam parameters, and sub-micrometer precision in beam position measurement. Charge measurement and energy measurement are important as well. In this work, technical concepts regarding the diagnostic monitors will be summarized and present status of them will be described.