The impact of divertor configuration on the structure of the radial electric field has been simulated by the B2SOLPS5.0 transport fluid code. It is shown that the change in the parallel flows in the scrape-off layer, which are transported through the separatrix due to turbulent viscosity and diffusivity, should result in variation of the radial electric field and toroidal rotation in the separatrix vicinity. The modelling predictions are compared with the measurements of the radial electric field for the low field side equatorial mid-plane of ASDEX Upgrade in lower, upper and double-null (DN) divertor configurations. The parallel (toroidal) flows in the scrape-off layer and mechanisms for their formation are analysed for different geometries. It is demonstrated that a spike in the electric field exists at the high field side equatorial mid-plane in the connected DN divertor configuration. Its origin is connected with different potential drops between the separatrix vicinity and divertor plates in the two disconnected scrape-off layers, while the separatrix should be at almost the same potential. The spike might be important for additional turbulent suppression.
偏滤器位形对径向电场结构的影响已通过B2SOLPS5.0输运流体代码进行了模拟。研究表明，由于湍流粘性和扩散性，刮削层中平行流穿过分离面的输运变化应导致分离面附近径向电场及环向旋转的改变。模拟预测与低场侧赤道面上ASDEX Upgrade在下偏滤器、上偏滤器及双零（DN）偏滤器位形下的径向电场测量结果进行了比较。针对不同几何位形，分析了刮削层中的平行（环向）流及其形成机制。结果表明，在连通的双零偏滤器位形中，高场侧赤道面处存在电场尖峰。该尖峰的起源与两个非连通刮削层中分离面附近和偏滤器靶板之间的电位降差异有关，而分离面本身应近似等电位。该尖峰可能对额外的湍流抑制具有重要意义。