The travelling wave （TW） disk-loaded accelerating structure is one of the key components in normal conducting （NC） linear accelerators, and has been studied for many years. In the design process, usually after the...The travelling wave （TW） disk-loaded accelerating structure is one of the key components in normal conducting （NC） linear accelerators, and has been studied for many years. In the design process, usually after the dimensions of each cell and the two couplers are finalized, the structure is fabricated and tuned, and then the whole structure RF characteristics are measured by using a vector network analyzer. Before fabrication, the whole structure characteristics （including RF, thermal and structural ones） are less simulated due to the limited capability of currently available computers. In this paper, we described a method for performing RF-thermal-structural-RF coupled analysis on a TW disk-loaded structure using only one PC. In order to validate our method, we first analyzed and compared our RF simulation results on the 3 m long BEPC Ⅱ structure with the corresponding experimental results, which shows very good consistency. Finally, the RF-thermal-structure-RF coupled analysis results on the 1.35 m long NSC KIPT linac accelerating structure are presented.展开更多
利用质量分数电导率法研究了克拉玛依常压渣油悬浮床加氢裂化在不同反应时间和反应温度下的胶体稳定性,并验证Yen T F渣油胶体结构模型。结果表明,克拉玛依常压渣油悬浮床加氢裂化体系的胶体稳定性在生焦诱导期内下降迅速,在生焦诱导期...利用质量分数电导率法研究了克拉玛依常压渣油悬浮床加氢裂化在不同反应时间和反应温度下的胶体稳定性,并验证Yen T F渣油胶体结构模型。结果表明,克拉玛依常压渣油悬浮床加氢裂化体系的胶体稳定性在生焦诱导期内下降迅速,在生焦诱导期后下降趋于缓慢;反应温度的升高使体系胶体稳定性下降。从反应后产物的族组成及其数均相对分子质量探讨了体系胶体稳定性变化的原因。研究表明,随着反应的进行,克拉玛依常压渣油体系中作为分散介质的饱和烃和轻芳烃含量逐渐上升,作为胶溶剂的胶质含量显著下降,其可溶质相对分子质量均呈下降趋势;而作为分散相的沥青质质量分数及数均相对分子质量在生焦诱导期内上升,在生焦后开始下降。胶体体系族组成及数均相对分子质量的变化破坏了该体系原有的稳定结构,导致了体系胶体稳定性的下降。展开更多
The present investigation was to understand the electrical properties of 27.5 Li2O-（72.5–x） B2O（3-x）Nd2O3 with x=0.5, 1, 1.5 and 2 glasses. We analyzed the impedance data for a wide frequency range to get inside ...The present investigation was to understand the electrical properties of 27.5 Li2O-（72.5–x） B2O（3-x）Nd2O3 with x=0.5, 1, 1.5 and 2 glasses. We analyzed the impedance data for a wide frequency range to get inside the conduction phenomenon. The conductivity of the glasses decreased due to the decrease in the mobility of mobile Li~＋ ions. This decrease was due to polymerization of glass network caused by the Nd^3＋ ions. Modulus formalism confirmed that the Li~＋ ions overcame the same barrier no matter whether it took part in the conduction process or relaxation process. Scaling of the electrochemical data showed that conduction process in the ion conducting glasses was composition dependent and not the temperature dependent.展开更多
To study the new RF control methods, a mathematic model of the RF system for the normal conducting linac is built and implemented with the software of Matlab. The model contains some typical units of the RF system, su...To study the new RF control methods, a mathematic model of the RF system for the normal conducting linac is built and implemented with the software of Matlab. The model contains some typical units of the RF system, such as the klystron, the SLED and the traveling wave accelerating tube. Finally, the model is used to study the working point of the SLED and the adaptive feed forward algorithm for the RF control system. Simulation shows that the model works well as expected.展开更多
文摘The travelling wave （TW） disk-loaded accelerating structure is one of the key components in normal conducting （NC） linear accelerators, and has been studied for many years. In the design process, usually after the dimensions of each cell and the two couplers are finalized, the structure is fabricated and tuned, and then the whole structure RF characteristics are measured by using a vector network analyzer. Before fabrication, the whole structure characteristics （including RF, thermal and structural ones） are less simulated due to the limited capability of currently available computers. In this paper, we described a method for performing RF-thermal-structural-RF coupled analysis on a TW disk-loaded structure using only one PC. In order to validate our method, we first analyzed and compared our RF simulation results on the 3 m long BEPC Ⅱ structure with the corresponding experimental results, which shows very good consistency. Finally, the RF-thermal-structure-RF coupled analysis results on the 1.35 m long NSC KIPT linac accelerating structure are presented.
文摘利用质量分数电导率法研究了克拉玛依常压渣油悬浮床加氢裂化在不同反应时间和反应温度下的胶体稳定性,并验证Yen T F渣油胶体结构模型。结果表明,克拉玛依常压渣油悬浮床加氢裂化体系的胶体稳定性在生焦诱导期内下降迅速,在生焦诱导期后下降趋于缓慢;反应温度的升高使体系胶体稳定性下降。从反应后产物的族组成及其数均相对分子质量探讨了体系胶体稳定性变化的原因。研究表明,随着反应的进行,克拉玛依常压渣油体系中作为分散介质的饱和烃和轻芳烃含量逐渐上升,作为胶溶剂的胶质含量显著下降,其可溶质相对分子质量均呈下降趋势;而作为分散相的沥青质质量分数及数均相对分子质量在生焦诱导期内上升,在生焦后开始下降。胶体体系族组成及数均相对分子质量的变化破坏了该体系原有的稳定结构,导致了体系胶体稳定性的下降。
文摘The present investigation was to understand the electrical properties of 27.5 Li2O-（72.5–x） B2O（3-x）Nd2O3 with x=0.5, 1, 1.5 and 2 glasses. We analyzed the impedance data for a wide frequency range to get inside the conduction phenomenon. The conductivity of the glasses decreased due to the decrease in the mobility of mobile Li~＋ ions. This decrease was due to polymerization of glass network caused by the Nd^3＋ ions. Modulus formalism confirmed that the Li~＋ ions overcame the same barrier no matter whether it took part in the conduction process or relaxation process. Scaling of the electrochemical data showed that conduction process in the ion conducting glasses was composition dependent and not the temperature dependent.
文摘To study the new RF control methods, a mathematic model of the RF system for the normal conducting linac is built and implemented with the software of Matlab. The model contains some typical units of the RF system, such as the klystron, the SLED and the traveling wave accelerating tube. Finally, the model is used to study the working point of the SLED and the adaptive feed forward algorithm for the RF control system. Simulation shows that the model works well as expected.
