| Paper | Title | Page |
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| MOPMY027 | Preliminary Design of High-efficiency Klystron for Pohang Accelerator Laboratory (PAL) | 557 |
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Funding: Supported by the Ministry of Science, ICT and Future Planning of Korea. Klystrons for particle accelerators are typically designed to have narrow bandwidths with center frequencies ranging from several hundreds (e.g., 350) MHz to X-band (11.424 GHz). Output powers are from several tens of kW to ~1 MW for CW klystrons and ~100 MW for pulsed ones. The narrow-bandwidth requirement has enabled them to provide high gain (typically 40 - 50 dB) which greatly simplifies the RF drive system. Recently, especially for large-scale accelerator facilities, the klystron efficiency has become one of the most demanding issues. This is because electricity cost occupies a great portion of their operating budgets and the klystron efficiency is one of the important factors determining the electricity consumption of the whole accelerator system. In this regard, we have designed a high-efficiency klystron for use in the PLS-II and PAL XFEL at PAL. The basic scheme is to re-design the cavity system to include multi-cell output cavity. In this article, we report on our preliminary design work to determine major cavity parameters including cell frequencies, inter-cell distances, and coupling to external circuits (coupling beta). |
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| DOI • | reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-MOPMY027 | |
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| WEPOR004 | Fast Orbit Feedback System at the Pls-Ii Storage Ring | 2667 |
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Funding: This work is supported by the Ministry of science, ICT and Future Planning, Korea. The transverse position of the electron beam in the Pohang Light Source-II (PLS-II) is stabilized by the global orbit feedback system. Currently, 2 Hz slow orbit feedback (SOFB) system is operating, and 1 kHz fast orbit feedback (FOFB) system is installed recently. This FOFB system is consists of 96 electron beam position monitors (BPMs), 48 horizontal fast correctors, 48 vertical fast correctors and VME control system. We present the design and implementation of the FOFB system and its test result. Analysis through the simulation is presented and future improvement is discussed |
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| DOI • | reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-WEPOR004 | |
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| THPMB030 | Operation Improvement by Tuning of Storage Ring at PLS-II | 3297 |
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| After upgrade of the pohang light source (PLS-II), several problems reduced the quality of the top-up operation. Unbalance of the injection kicker system and it's lack of control had limited the efficiency of the injection from the linac to the storage ring. We tuned the storage ring to improve the injection efficiency and to stabilize the orbit during the injection. | ||
| DOI • | reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-THPMB030 | |
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| THPMW011 | Magnet Power Supplies Performance at the PLS-II Storage Ring | 3558 |
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Funding: This work is supported by the Ministry of science, ICT and Future Planning, Korea. Magnet power supplies(MPS) are operating unipolar(bending, main-quadrupole, sextupole and septum) and bipolar(slow corrector, fast corrector, aux-quadrupole and skew) at the PLS-II storage ring(SR). Unipolar MPSs maintain stability, and bipolar MPSs maintain stability, have best resolution performance total operation region including zero-crossing during beam operation. Slow and fast corrector MPSs for beam correction have good step response characteristics. In this paper, we present the improve activity and performance of the PLS-II SR MPS. |
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| DOI • | reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-THPMW011 | |
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