| Paper | Title | Page |
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| MOPD40 | Simulation for New Injector Test Facility of PAL-XFEL | 117 |
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| As a part of the preparation plan of PAL-XFEL, Injector Test Facility (ITF) has been constructed and now required beamline components are being installed for the test of injector system. ITF components includes RF gun, two accelerating columes, solenoids and basic diagnostic components such as spectrometers, quad scan system, BPMs, wire scanner, etc. Main diagnostics will be installed until October this year and deflecting cavity and laser heater will be installed next year. This facility will generate 135 MeV electron beam with the emittance under 0.5 mm-mrad. Simulation for the optimized operation of the ITF has been carried out with ASTRA code and its results are given in this paper. | ||
| MOPD41 | Low Emittance Injector Development for the PAL-XFEL Project | 121 |
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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. |
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| MOPD42 | Microbunching Instability Study for the PAL-XFEL Linac | 125 |
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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. |
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| MOPD43 | New RF-Gun Design for The PAL-XFEL | 129 |
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| 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. | ||
| TUPD03 | Preliminary FEL Simulation Study for PAL XFEL | 229 |
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| Pohang Accelerator Laboratory X-ray Free Electron Laser (PAL XFEL) will provide X-ray FEL radiation in a range of 0.1 and 10nm with five undulator beamlines. A undulator section for hard X-ray is designed for 0.1nm SASE FEL. The wakefield effect and its cure by tapering are investigated by tracking simulation. We present FEL simulation study by using GENESIS | ||
| TUPD34 | Beam Optics Design for PAL-XFEL | 309 |
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| 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. | ||