A 57-Pin Langmuir Probe Array for Two-Dimensional Diagnosis in the Toroidal KT-5D Steady-State Plasma

In this article, the design idea of a 57-pin Langmuir probe array is presented, together with some experimental results. The manufacture technique of the probe array is discussed. Two-dimensional distributions of the plasma density, the floating potential and their fluctuations in the poloidal cross section are obtained. The blobs, which move radially and poloidally, cause great particle and energy transport. The charge neutralization by the poloidal movement of particles greatly decreases the vertical electric field in the helimak plasma. This leads to a confinement time which is two orders of magnitude larger than the theoretical prediction.     

基于NSGA-Ⅱ的晶体学光束线多目标自动优化

由光束线状态决定的光束质量很大程度上影响着生物大分子晶体学的实验结果,目前上海光源晶体学线站的调光工作是由线站工作人员手动完成,费时费力。上海光源衍射线站采用差分进化算法实现了光束线样品点处光通量的单目标自动优化,但该方案仍然存在一定的局限性。为了进一步完善光束线自动优化方案和提高实验用户的束线机时使用效率,使用Python语言设计开发了基于带精英策略的非支配排序的遗传算法(Non Dominated Sorting Genetic Algorithm-Ⅱ,NSGA-Ⅱ)的多目标优化程序,实现了线站调光自动化技术升级。将该技术应用于上海光源BL10U2线站,以其次级光源点的光束位置和光通量为优化目标,可获得Pareto最优解集,并能从解集中根据实验需要自主选取合适的解。测试结果表明:相较于上海光源已有的自动优化方案,该多目标自动优化程序保证了光束线光束位置和光通量优化在30 min以内完成,进一步提高光束线自动优化效率和水平。     

丝扫描探测器测量同步辐射X光的位置和尺寸

丝扫描探测器可用于同步辐射光束线站光束位置和光斑大小的测量,论文简述了该探测器的结构和设计中的注意事项,同时给出了不同的数据处理方法对探测器测量结果的影响效果;可指导设计不同要求的丝扫描探测器,其测量精度最高能达到10μm。论文还介绍了丝扫描探测器的拓展应用,以及此类探测器在上海光源光束线上的使用情况,所设计的丝扫描探测器全部满足了各条光束线站的测量要求;并进一步提出了开展此类探测器研究的内容及其作用。     

Upgrading of the Magnetic Confinement Plasma Device KT-5E

In this article we present ideas of providing appropriate poloidal magnetic field for helimaks to help to generate toroidal magnetic plasma torus.Placing a conductive ring in the center of the cross-section to induce a suitable current,we change the helical magnetic field lines in the helimak discharge into magnetic surface.In this kind of discharge,the plasma density is greatly increased,and the corresponding density fluctuation is significantly decreased,showing a better confinement by magnetic shear.It allows more flexible and efficient experimental investigations on the toroidal magnetic confinement plasmas to be carried on in this kind of device.     

上海光源光束线前端区XBPM探测器

XBPM探测器是同步辐射装置中测量X光位置的关键设备,主要用于测量光源点产生的X光的位置和光斑形状等。本文着重阐述了用于上海光源光束线前端区的刀片式X光位置探测器的构成及其分析,荧光靶探测器的结构,以及如何使用两种探测器在Canted光束线上进行初次调光;同时,就这两种探测器的当前现状和今后的发展做了简要的说明,并给出了上海光源一期光束线前端区XBPM探测器升级改造的初步结果。