超相对论正电子束通过米级等离子体的传输。
Ultrarelativistic-positron-beam transport through meter-scale plasmas.
作者信息
Hogan M J, Clayton C E, Huang C, Muggli P, Wang S, Blue B E, Walz D, Marsh K A, O'Connell C L, Lee S, Iverson R, Decker F-J, Raimondi P, Mori W B, Katsouleas T C, Joshi C, Siemann R H
机构信息
Stanford Linear Accelerator Center, Stanford, California 94309, USA.
出版信息
Phys Rev Lett. 2003 May 23;90(20):205002. doi: 10.1103/PhysRevLett.90.205002. Epub 2003 May 21.
We report on the first study of the dynamic transverse forces imparted to an ultrarelativistic positron beam by a long plasma in the underdense regime. Focusing of the 28.5 GeV beam is observed from time-resolved beam profiles after the 1.4 m plasma. The strength of the imparted force varies along the approximately 12 ps full length of the bunch as well as with plasma density. Computer simulations substantiate the longitudinal aberration seen in the data and reveal mechanisms for emittance degradation.
我们报告了关于欠稠密状态下长等离子体赋予超相对论正电子束动态横向力的首次研究。在经过1.4米长的等离子体后，通过时间分辨束流剖面观察到了28.5 GeV束流的聚焦情况。所施加力的强度沿束团约12皮秒的全长以及随等离子体密度而变化。计算机模拟证实了数据中所见的纵向像差，并揭示了发射度退化的机制。
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