| Paper | Title | Page |
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| MOPB007 | Design of the Superconducting Quarter Wave Resonators for HIAF | 59 |
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| A heavy ion accelerator facility (HIAF) is under development in the Institute of Modern Physics. For the low energy superconducting accelerating section, two types of quarter wave resonators with frequency of 81.25 MHz and β of 0.05 and 0.10 have been proposed. The electro-magnetic design has been optimized in order to reach the high accelerating voltage, and the optimization also included the drift tube face tilting to compensate for the beam steering caused by the asymmetry in the quarter wave resonator geometry. | ||
| DOI • | reference for this paper ※ https://doi.org/10.18429/JACoW-SRF2017-MOPB007 | |
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| MOPB072 | The Development of the LLRF Control System for the New High Power Test Stand of Couplers | 227 |
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| RF power conditioning is an effective way to suppress multipacting in fundamental mode power couplers. Room temperature test-stand conditioning is an essential step that can be hardly circumvented before couplers are installed on SC cavities. Based on our original one, a new test-stand has been designed and being assembled at IMP. It can work as a multi-task platform conditioning different couplers, including couplers for HWR010 cavities and HWR015 cavities. It is also featured with the capacity to flexibly change β according to different specifications. A variety of conditioning modes have been incorporated into the LLRF system, including frequency sweeping mode, amplitude sweeping mode, arbitrary-duty-cycle mode and triangle-wave mode. In addition, smartly-conditioning has been achieved because of the accomplishment of smart interlocks and automatic reset in the system. | ||
| DOI • | reference for this paper ※ https://doi.org/10.18429/JACoW-SRF2017-MOPB072 | |
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| MOPB074 | Analysis of Higher Order Modes of the Superconducting Cavities for the China-ADS Injector-II in IMP | 231 |
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Funding: funded by Natural Science Foundation of China， No.11505253 The influence of the higher order modes on the beam dynamics and the cryogenic losses has been studied for the superconducting section of the CIADS project in this paper. In addition, the necessity of HOM dampers in the Superconducting (SC) cavities is discussed. |
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| DOI • | reference for this paper ※ https://doi.org/10.18429/JACoW-SRF2017-MOPB074 | |
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| TUPB040 | Design and Optimization of Medium and High Beta Superconducting Elliptical Cavities for the CW Linac in CIADS | 478 |
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| Superconducting technology is adopted in the main accelerating section of the CW Linac in China Initiative Accelerator Driven System (CIADS) to accelerate the 10 mA proton beam from 2.1 MeV up to 1.5 GeV. The high energy section of the superconducting linac is composed of two families of SC elliptical cavities with optimum beta 0.62 and 0.82 for the acceleration of proton beam from 178 MeV to 1.5 GeV. In this paper, the design and optimization of the 650 MHz medium and high beta elliptical cavities are discussed, including the RF design, multipacting analysis, high order modes (HOMs) analysis, generator RF power calculation, and the mechanical design. | ||
| DOI • | reference for this paper ※ https://doi.org/10.18429/JACoW-SRF2017-TUPB040 | |
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| THPB024 | Investigation on Depth Profiling of Niobium Surface Composition and Work Function of SRF Cavities | 779 |
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| The niobium samples were prepared by different surface treatments that commonly applied for the superconducting RF cavities preparation, as the following of electrochemical polishing, the buffered chemical polishing and high temperature annealing. In order to understand the property of niobium surface, especially the relationship between the composition and the work function value, the X-ray and ultraviolet photoelectron spectra depth profiling has been studied. The intensity photoelectrons signals of O1s, C1s and the Nb3d were identified for composition of the niobium oxide and the hydrocarbon contamination. And the work function of sample surface was measured via the means of the ultraviolet photoelectron spectra band width. To make a depth profiling, the sputtering of Argon ions was used to remove surface material gradually under by control the sputtering times. The results shown that the value of work function strongly depends on the chemical composition. | ||
| DOI • | reference for this paper ※ https://doi.org/10.18429/JACoW-SRF2017-THPB024 | |
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