High magnetic field, large-volume magnetic multipole ion source producing hydrogen ion beams with high proton ratio
High magnetic field, large-volume magnetic multipole ion source producing hydrogen ion beams with high proton ratio
复制标题
高磁场、大体积磁性多极离子源，产生高质子比氢离子束
DOI：
10.1063/1.1137577
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发表时间：
1984
影响因子：
1.6
通讯作者：
K. Mizuhashi
中科院分区：
文献类型：
--
作者：
Y. Okumura;H. Horiike;K. Mizuhashi
为了提高氢离子束中的质子比例，一种高磁场、大体积的磁多极离子源已被设计并测试。等离子体源由一个水冷矩形铜室构成，该铜室被一组低碳钢带和钐 - 钴磁体环绕，这些磁体呈连续的线会切几何形状排列。内壁表面的磁场强度为2.7千高斯。这种强磁场使我们能够在不增加离子损失面积的情况下增大室体积。大的等离子体体积和小的离子损失面积增加了离子约束时间并提高了质子产额。通过磁动量质量分析仪和光学光谱仪测量，在离子束电流为28安（电流密度\(j = 250\)毫安/平方厘米）时，束中的质子比例超过90%。通过用铝镍钴磁体替换钐 - 钴磁体，该离子源也能在弱磁场（约0.6千高斯）下运行，在这种情况下质子比例降低到80%。这些实验值……
In order to enhance the proton fraction in hydrogen ion beams, a high magnetic field, large‐volume magnetic multipole ion source has been designed and tested. The plasma source is made of a water‐cooled rectangular copper chamber, which is surrounded by a set of mild steel strips and samarium–cobalt magnets arranged in a continuous line‐cusp geometry. The magnetic field at the inner wall surface is 2.7 kG. This strong magnetic field enables us to enlarge the chamber volume without increasing the ion loss area. Large plasma volume and small ion loss area increase the ion confinement time and enhance the proton yield. The proton fraction in the beams, as measured by both a magnetic momentum mass analyzer and a optical spectrometer, is found to be more than 90% at an ion beam current of 28 A ( j=250 mA/cm2). This source is also operated with a weak magnetic field (∼0.6 kG) by replacing the samarium–cobalt magnets with AlNiCo magnet, in which case the proton fraction decreases to 80%. These experimental value...