Suppression of secondary emission of electrons from end plate in expander of open trap
Suppression of secondary emission of electrons from end plate in expander of open trap
复制标题
开式陷阱扩展器端板电子二次发射的抑制
DOI：
--
复制
发表时间：
2019
影响因子：
2.2
通讯作者：
D. Skovorodin
中科院分区：
文献类型：
--
作者：
D. Skovorodin
研究了线性等离子体装置中膨胀偏滤器端板的二次辐射对能量约束的影响。建立了一个数值模型，计算了膨胀偏滤器内电势沿磁场线的沿着分布。该模型假设弱碰撞和离子和电子的交叉场损失的情况下。给出了无二次发射和强二次发射情况下的电势分布。结果表明，即使二次发射系数大于1，偏滤器内磁场的膨胀也能有效地抑制冷电子对能量约束的影响。研究了每个离子离开反射镜的能量损失与二次发射系数的关系。讨论了冷电子部分能量回收对总能量平衡的影响。结果表明，在二次发射系数不太大的情况下，单离子能量损失对冷电子再循环不敏感，并考虑了膨胀偏滤器端板二次发射对线性等离子体装置能量约束的影响。建立了一个数值模型，计算了膨胀偏滤器内电势沿磁场线的沿着分布。该模型假设弱碰撞和离子和电子的交叉场损失的情况下。给出了无二次发射和强二次发射情况下的电势分布。结果表明，即使二次发射系数大于1，偏滤器内磁场的膨胀也能有效地抑制冷电子对能量约束的影响。研究了每个离子离开反射镜的能量损失与二次发射系数的关系。讨论了冷电子部分能量回收对总能量平衡的影响。结果表明，只要选择合适的离子束，单离子能量损失对冷电子再循环不敏感。
The influence of secondary emission from the end plate in the expander divertor on the energy confinement in linear plasma devices was considered. A numerical model was developed to calculate a distribution of the electric potential along a magnetic field line in the expander divertor. The model assumes weak collisions and the absence of cross-field losses of both ions and electrons. The potential profiles in the case of both no and strong secondary emission are presented. It was shown that expansion of the magnetic field in the divertor can effectively suppress the influence of cold electrons on energy confinement even if the secondary emission coefficient is more than unity. The dependence of energy lost per one ion leaving the mirror on the secondary emission coefficient was studied. The influence of partial energy recuperation by cold electrons on the total energy balance was discussed. It has been shown that the energy loss per one ion is not sensitive to the recirculation of cold electrons if the secondary emission coefficient is not too large.The influence of secondary emission from the end plate in the expander divertor on the energy confinement in linear plasma devices was considered. A numerical model was developed to calculate a distribution of the electric potential along a magnetic field line in the expander divertor. The model assumes weak collisions and the absence of cross-field losses of both ions and electrons. The potential profiles in the case of both no and strong secondary emission are presented. It was shown that expansion of the magnetic field in the divertor can effectively suppress the influence of cold electrons on energy confinement even if the secondary emission coefficient is more than unity. The dependence of energy lost per one ion leaving the mirror on the secondary emission coefficient was studied. The influence of partial energy recuperation by cold electrons on the total energy balance was discussed. It has been shown that the energy loss per one ion is not sensitive to the recirculation of cold electrons if the se...