Deng S, Barnes C D, Clayton C E, O'Connell C, Decker F J, Erdem O, Fonseca R A, Huang C, Hogan M J, Iverson R, Johnson D K, Joshi C, Katsouleas T, Krejcik P, Lu W, Marsh K A, Mori W B, Muggli P, Tsung F
University of Southern California, Los Angeles, California 90089, USA.
Phys Rev E Stat Nonlin Soft Matter Phys. 2003 Oct;68(4 Pt 2):047401. doi: 10.1103/PhysRevE.68.047401. Epub 2003 Oct 14.
Tunnel ionizing neutral gas with the self-field of a charged particle beam is explored as a possible way of creating plasma sources for a plasma wakefield accelerator [Bruhwiler et al., Phys. Plasmas (to be published)]. The optimal gas density for maximizing the plasma wakefield without preionized plasma is studied using the PIC simulation code OSIRIS [R. Hemker et al., in Proceeding of the Fifth IEEE Particle Accelerator Conference (IEEE, 1999), pp. 3672-3674]. To obtain wakefields comparable to the optimal preionized case, the gas density needs to be seven times higher than the plasma density in a typical preionized case. A physical explanation is given.
探索利用带电粒子束的自场使中性气体电离成隧道状，以此作为为等离子体尾场加速器创建等离子体源的一种可能方法[布鲁维勒等人，《物理等离子体》（待发表）]。使用粒子模拟代码OSIRIS[R. 亨姆克等人，发表于《第五届IEEE粒子加速器会议论文集》（IEEE，1999年），第3672 - 3674页]研究了在没有预电离等离子体的情况下使等离子体尾场最大化的最佳气体密度。为了获得与最佳预电离情况相当的尾场，气体密度需要比典型预电离情况下的等离子体密度高七倍。文中给出了物理解释。
