| Paper | Title | Page |
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| MOPWA056 | Transverse Multi-Pass Beam Breakup Simulation for KEK ERL Light Source | 248 |
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| In this paper, the multi-pass BBU of such a high energy ERL is studied based on the simulation on a 3 GeV ERL light source proposed by KEK. | ||
| DOI • | reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2015-MOPWA056 | |
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| MOPTY013 | Control System for DC-SRF Photo-Injector at Peking University | 962 |
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| A control system has been designed and constructed to full-fill the operation requirement of the DC-SRF photo injector developed at Peking University. The system includes FPGA based low level radio frequency (LLRF) control system, PLC based machine protection system, VME based magnet power control, and PC based EPICS IOC. All these systems were integrated to support the stable operation of the DC-SRF photo injector and has shown their robustness. The LLRF system was optimized and tuned for 2K CW/Pulse operation and the stability of amplitude and phase achieves 0.1% and 0.1° respectively. | ||
| DOI • | reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2015-MOPTY013 | |
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| MOPTY014 | An Experimental Study of Higher-Order Modes Excited by High Repetition Rate Electron Beam in an SRF Cavity | 965 |
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Funding: National Natural Science Foundation of China (No. 11275014) Higher-order modes (HOMs) excited by electron beam traversing a superconducting rf (SRF) cavity contain lots of information and can be used for intra-cavity electron beam diagnostics. Unlike single bunch, multiple bunches would excite HOMs with a much complicated spectrum. In this paper, we present our recent research on HOMs excited by a high repetition rate electron beam in an SRF cavity. Especially, we focus on the integer multiple frequency peaks in the HOM spectrum, which are determined by the nearest eigen HOM peaks. The experiments were carried out on the DC-SRF photoinjector, which was operated at MHz repetition rate. The results agree well with theoretic analysis. |
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| DOI • | reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2015-MOPTY014 | |
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| WEPMN012 | Cathode Stalk Optimization for a 325 MHz Superconducting QWR Electron Gun | 2940 |
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Funding: Work supported by National Basic Research Project (No. 2011CB808302) The structure of cathode stalk is very important for the performance of a superconducting QWR (Quarter Wave Resonator) gun. With improper design, RF power dissipation on the surface of cathode stalk and its surrounding tube can lead to a serious decrease of quality factor for superconducting QWR injector. We present here an optimized design of the cathode stalk for the 325 MHz superconducting QWR gun and special considerations are taken to minimize the power dissipation. The details of microwave simulation, beam dynamic simulation of the cavity with cathode stalks in different length, diameter and position are presented in this paper. |
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| DOI • | reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2015-WEPMN012 | |
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| WEPMN013 | Development of DC-SRF Injector at Peking University | 2944 |
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| DC-SRF electron injector, which combines a DC Pierce gun and a 3.5 cell 1.3 GHz superconductor cavity in a cryomodule, has been developed at Peking University. Based on the improvements of beam line, LLRF system and 2K cryogenic system, stable operation of the DC-SRF injector has been carried out recently. Electron beams with 3.4 MeV energy and the currents of ~1mA in a macro-pulse mode was obtained. As the first application of this DC-SRF injector, THz radiation produced with a 10 period undulator was also detected. The description of the experiment process and results will be presented in this paper. | ||
| DOI • | reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2015-WEPMN013 | |
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| WEPWI013 | New Results of Development on High Efficiency High Gradient Superconducting RF Cavities | 3518 |
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| We report on the latest results of development on high efficiency high gradient superconducting radio frequency (SRF) cavities. Several 1-cell cavities made of large-grain niobium (Nb) were built, processed and tested. Two of these cavities are of the Low Surface Field (LSF) shape. Series of tests were carried out following controlled thermal cycling. Experiments toward zero-field cooling were carried out. The best experimentally achieved results are Eacc = 41 MV/m at Q0 = 6.5×1010 at 1.4 K by a 1-cell 1.3 GHz large-grain Nb TTF shape cavity and Eacc = 49 MV/m at Q0 = 1.5×1010 at 1.8 K by a 1-cell 1.5 GHz large-grain Nb CEBAF upgrade low-loss shape cavity. | ||
| DOI • | reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2015-WEPWI013 | |
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