Ionization Induced Trapping in a Laser Wakefield Accelerator
Ionization Induced Trapping in a Laser Wakefield Accelerator
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DOI：
10.1103/physrevlett.104.025004
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发表时间：
2010-01-15
影响因子：
8.6
通讯作者：
Karpeev, A. V.
中科院分区：
文献类型：
--
作者：
McGuffey, C.;Thomas, A. G. R.;Karpeev, A. V.
对激光韦克菲尔德加速器中产生的电子的实验研究表明，俘获是由靶气体原子的电离引发的。由氦和受控量的各种气体组成的靶被发现在相同的电子密度下与纯氦相比将束电荷增加多达一个数量级，并将束发散度从5：1 +/- 1：0降低到2：9 +/- 0：8 mrad。包括电离在内的粒子细胞模型支持测量。这种机制应允许产生的电子束具有较低的发射度和较高的电荷比在预电离气体。
Experimental studies of electrons produced in a laser wakefield accelerator indicate trapping initiated by ionization of target gas atoms. Targets composed of helium and controlled amounts of various gases were found to increase the beam charge by as much as an order of magnitude compared to pure helium at the same electron density and decrease the beam divergence from 5: 1 +/- 1: 0 to 2: 9 +/- 0: 8 mrad. The measurements are supported by particle-in-cell modeling including ionization. This mechanism should allow generation of electron beams with lower emittance and higher charge than in preionized gas.