| Paper | Title | Page |
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| MOPME058 | The Magnet Power Supply for PAL-XFEL | 504 |
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| A magnet power supply (MPS) for PAL-XFEL was developed, which is the bipolar type with the power capacity of 3.6KW. The MPS has been implemented by the digital signal processing technology using the DSP, FPGA, ADCs and so on. An embedded module was adapted for the Ethernet connection for EPCIS. The output current stability of the MPS showed about 10 ppm peak-to-peak in long term experiment. The measured accuracy was less than 10ppm in full range. The other experimental results such as repeatability and zero-cross response were given in this paper. | ||
| DOI • | reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-MOPME058 | |
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| TUPRO098 | Design and Test of Dipole and Quadrupole Magnets for PAL-XFEL | 1271 |
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| PAL-XFEL, currently under construction in Pohang, Korea, will consist of a 10 GeV linac, three hard X-ray branches and two soft X-ray branches. As the first phase of this project, one hard X-ray (HX1) and one soft X-ray (SX1) branches will be constructed. This facility requires 6 different families of dipole magnets, and 11 families of quadrupole magnets included steering functions. We are designing these magnets with the water cooling or the heat sink system now. In this presentation, we describe the modified design of the magnets for efficient manufacturing, and the magnetic and thermal analysis with the test results. | ||
| DOI • | reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-TUPRO098 | |
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| WEPRO040 | Field Measurement Facility for PAL-XFEL Undulators | 2032 |
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| Pohang Accelerator Laboratory (PAL) is developing the SASE based FEL for X-ray coherent photon sources. The PAL developed the prototype undulator that was 5.0 m magnetic length. The PAL has constructed the undulator field measurement facility to confirm the field qualities of the XFEL undulators in the assembly building. The temperature stability of the measurement rooms was controlled within ±0.1°C. Two field measurement benches that included Hall probe scan, flip coil and stretched wire system were installed and evaluated their performances. The field profile of the prototype undulator was characterized and shimmed using the installed measurement system. This paper described the field measurement facility with the performance test results of the two benches. | ||
| DOI • | reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-WEPRO040 | |
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| THPRO019 | Current Status of PAL-XFEL Project | 2897 |
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| The PAL-XFEL, a 0.1-nm hard X-ray FEL facility consisting of a 10-GeV S-band linac, is being constructed in Pohang, South Korea. The installation of linac, undulator, and beam line will be completed by 2015. Its building construction is at its peak moment to be completed by December 2014. The major procurement contract was made in 2013 for the critical components of S-band linac modules and hard X-ray undulators. The commissioning will start in January 2016. We hope the first lasing will be achieved in early 2016. | ||
| DOI • | reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-THPRO019 | |
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| THPRO020 | Linac Lattice Optimization for PAL-XFEL Hard X-ray FEL Line | 2900 |
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Funding: This work is supported by MSIP, Korea. PAL-XFEL is designed to generate 1 – 0.06-nm FEL in hard x-ray FEL line. The linac for hard x-ray generates 10-GeV, 200-pC, and 3-kA electron beam. It consists of accelerating columns, three bunch compressors, an X-band linearizer, and dog-leg line. We conduct ELEGANT simulations to obtain the optimized lattice for hard x-ray line. The candidates of the optimized lattice are obtained by Multi-Objective Genetic Algorithm (MOGA) whose objectives are the FEL saturation power and length. These are evaluated with their error tolerances. Error tolerances are obtained by two methods of error simulations. First, the linear interpolation method is conducted in order to determine the machine tolerance. Also, we find out the dominant machine parameters to increase the beam jitter by this method. Second, the error simulations with random errors of machine parameters are conducted to verify the results of the linear interpolation method and calculate beam jittering levels. In this paper, we present the details of the optimized linac lattice for hard x-ray FEL. Also, we present the procedure of the linac lattice optimization. |
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| DOI • | reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-THPRO020 | |
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| WEPRO039 | Status of PAL-XFEL Undulator Program | 2029 |
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| Pohang Accelerator Laboratory (PAL) is developing 10 GeV, 0.1 nm SASE based FEL for high power, short pulse X-ray coherent photon sources named PAL-XFEL. At the first stage PAL-XFEL needs two undulator lines for photon source. PAL is developing undulator magnetic structure based on EU-XFEL design. Recently, the hard X-ray undulator changed its minimum magnetic gap to 8.3 mm from the previous 7.2 mm to alleviate the wake field impact, and to increase the allowances for the re alignment. Accordingly, the period is also changed from 24.4 mm to 26.0 mm to generate 0.1 nm at 10 GeV electron energy. In this report, the modification efforts and the progress on the prototyping of hard x-ray undulator system will be presented. | ||
| DOI • | reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-WEPRO039 | |
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