The effect of resonant magnetic perturbation with different poloidal mode numbers on peeling–ballooning modes

The effect of resonant magnetic perturbation (RMP) with different poloidal mode numbers on peeling– ballooning (P–B) modes is simulated with the BOUT++ code. In order to investigate the physical mechanism of edge-localized mode mitigated by RMP, a series of RMPs with different poloidal mode numbers are applied into the four-field P–B mode simulation module separately. The results indicate that RMP has a better reducing effect on the energy loss from the pedestal when the resonant position is near the bottom and top of pedestal rather than near the middle. The RMP could influence P–B modes through the following effects: on the one hand, the E × B shearing rate is significantly stronger when the RMP (resonant surface locates at the top of the pedestal) is added, which can suppress the radial propagation of the negative pressure perturbation and reduce energy loss from the pedestal. On the other hand, the coupling of toroidal modes in the nonlinear phase is enhanced when RMPs are added, which motivated the growth of multiple toroidal modes, and the turbulence fluctuation level is weaker with the RMP when the resonant surface is located at the bottom of the pedestal.     

Electron Cyclotron Harmonic Wave Heating in Tokamak Plasmas with Different Polarization Modes

Electron cyclotron heating on HL-2A has been simulated by TORAY-GA with a second harmonic extraordinary wave and a fundamental ordinary wave. The results show that the wave absorption of the second harmonic extraordinary wave is better than that of the fundamental ordinary wave. In order to understand the interaction mechanism between electrons and the two different polarization modes, the energy exchange between electrons and the two modes are theoretically analyzed, and it is found that the coupling intensity described by the Bessel function and different polarizations of the two modes are the main reasons leading to the above phenomenon. The theoretical results of this study fit well with the simulated and numerical results.     

The electromagnetic instability in electron flow with ion background

Electromagnetic (EM) behavior and instability resulting from the interaction between EM wave and plasma wave are analyzed based on linear perturbation theory. It is shown that the instability is caused by the the coupling between high frequency electromagnetic field and electron transverse oscillation derived from the deflection of electron longitudinal oscillation due to self-produced magnetic field. The influences of the self-produced magnetic field and plasma density on the instability are studied. In addition characteristics of EM wave propagation at different angles are investigated. The present results are of significance to new type plasma radiation source, ion accelerator and plasma diagnostic techniques.     

硅氢加成法合成环己基甲基二甲氧基硅烷

对环己基甲基二甲氧基硅烷 (CMMS) (合成聚丙烯的助催化剂 )的合成进行了研究。以环己烯和甲基氢二氯硅烷 (DCMS)为原料 ,在硅氧烷铂配合物催化下制得中间体环己基甲基二氯硅烷 (CMCS) ,再与甲醇反应 ,制备终产物CMMS。合成中间体最佳工艺条件为 :反应温度 80～ 90℃ ,n(环己烯 )∶n(DCMS) =1 0 0∶1 2 2 ,1mol环己烯用催化剂 0 80mL ,叔丁醇 1 0mL ,反应时间 4h ,收率 87 9%;终产物的合成条件为 :第一阶段反应室温下进行 ,n(甲醇 )∶n(CMCS) =1 2 2∶1 0 0 ;第二阶段反应温度≤ 40℃ ,n(甲醇 )∶n(CMCS) =5 0 0∶1 0 0 ,通过减压及用甲醇作为氯化氢吸收剂 ,分液操作 ,除去反应副产物氯化氢。残留产品中的氯化氢用甲醇钠溶液中和 ,得目标产物CMMS ,收率 73 5 %,w(CMMS) =99 2 5 %(GC)。用IR、GC -MS对CMMS的结构进行了表征。本工艺操作简便 ,原料价廉易得 ,成本较低 ,适于工业化生产。     

汽车涂装线余热回收系统及其应用

分析了涂装废气余热回收的可行性并介绍了其在汽车生产线中的应用,阐述了具体案例的流程,说明了注意事项并证明了余热回收的效果和推广意义。