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arXiv 2007.14894physics.plasm-phphysics.acc-ph
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密度梯度等离子体中的质子束团自调制

Proton Bunch Self-Modulation in Plasma with Density Gradient

F. Braunmüller, T. Nechaeva, AWAKE Collboration

摘要:

实验研究了线性等离子体密度梯度对40 0 GeV质子束团自调制的影响.结果表明,当等离子体厚度为10 μ m时,微束团的数量和微束团的相对电荷随着等离子体厚度的增加而减少.测量的调制频率也在/减小。对于最大的正梯度,我们观察到调制功率谱中的两个频率。结果与线性理论预测的在自调制生长过程中,由于等离子体密度梯度增加到慢尾流场的相速度而引起的尾流场相速度的变化是一致的。

英文摘要:

We study experimentally the effect of linear plasma density gradients on the self-modulation of a 400\,GeV proton bunch. Results show that a positive/negative gradient in/decreases the number of micro-bunches and the relative charge per micro-bunch observed after 10\,m of plasma. The measured modulation frequency also in/decreases. With the largest positive gradient we observe two frequencies in the modulation power spectrum. Results are consistent with changes in wakefields' phase velocity due to plasma density gradient adding to the slow wakefields' phase velocity during self-modulation growth predicted by linear theory.

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