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首页> 外文期刊>Plasma physics and controlled fusion >Electron-loss cross sections for heavy-ion beam probe using gold beams: experiment and theory
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Electron-loss cross sections for heavy-ion beam probe using gold beams: experiment and theory

机译：使用金束的重离子束探针的电子损耗截面：实验和理论

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摘要

We present cross section experimental data required for modeling beam production, attenuation and energy loss in the heavy-ion beam probe technique, namely, electron-loss cross sections for anionic gold projectiles and Ar and N-2 targets in the energy range from 30 keV to 1 MeV. The results agree well with low-energy measured values from the literature for the Ar target. The present results are also compared with literature results for the H-projectile and the Ar target, displaying similar velocity dependences. This similarity led to the use of a simple semi-classical model to calculate the projectile-electron-loss cross sections in a wide energy range. This model employs the total scattering cross sections for free electrons and the momentum distribution of the Au-electrons. The present experimental results are in good agreement with this model, allowing a reliable estimate of the cross section values up to 100 MeV. Our results indicate that previously calculated cross sections are overestimated by at least a factor of two. This previous overestimation of electron-loss cross sections leads to significant errors in the modeling of charge-state fractions of gold beams, with consequences in the optimization of beam energy resolution and intensity for HIBP with megaelectronvolts gold beams.
机译：我们提供了在重离子束探针技术中建模束产生，衰减和能量损失所需的横截面实验数据，即，阴离子金弹丸以及Ar和N-2目标在30 keV能量范围内的电子损失横截面到1 MeV结果与文献中针对Ar目标的低能量测量值非常吻合。目前的结果也与H弹和Ar目标的文献结果进行了比较，显示出相似的速度依赖性。这种相似性导致使用简单的半经典模型来计算宽能范围内的弹丸电子损耗截面。该模型采用了自由电子的总散射截面和金电子的动量分布。目前的实验结果与该模型非常吻合，可以可靠地估算出高达100 MeV的横截面值。我们的结果表明，先前计算的横截面被高估了至少两倍。先前对电子损耗截面的高估会导致金束电荷状态分数建模的重大错误，从而导致兆电子伏特金束的HIBP的束能量分辨率和强度优化。

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