Tripathi S K P, Pribyl P, Gekelman W
Physics and Astronomy, University of California at Los Angeles, Los Angeles, California 90095, USA.
Rev Sci Instrum. 2011 Sep;82(9):093501. doi: 10.1063/1.3631628.
A helium ion beam source (23 kV/2.0 A) has been constructed for studying fast-ion physics in the cylindrical magnetized plasma of the large plasma device (LAPD). An inductive RF source produces a 10(19) m(-3) density plasma in a ceramic dome. A multi-aperture, rectangular (8 cm × 8 cm) three-grid system extracts the ion beam from the RF plasma. The ion beam is injected at a variety of pitch angles with Alfvénic speeds in the LAPD. The beam current is intense enough to excite magnetic perturbations in the ambient plasma. Measurements of the ion beam profile were made to achieve an optimum beam performance and a reliable source operation was demonstrated on the LAPD.
已建造了一个氦离子束源（23 kV/2.0 A），用于研究大型等离子体装置（LAPD）圆柱磁化等离子体中的快离子物理。一个感应射频源在陶瓷穹顶中产生密度为10(19) m(-3) 的等离子体。一个多孔径、矩形（8 cm×8 cm）的三栅系统从射频等离子体中引出离子束。离子束以各种俯仰角、阿尔文速度注入LAPD。束流强度足以激发周围等离子体中的磁扰动。对离子束轮廓进行了测量，以实现最佳束性能，并在LAPD上展示了可靠的源运行。
