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arXiv 1809.01191physics.acc-ph
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质子束团种子自调制驱动等离子体尾场增长的实验观察

Experimental observation of plasma wakefield growth driven by the seeded self-modulation of a proton bunch

M. Turner, the AWAKE Collaboration

摘要:

本文测量了相对论质子束团在等离子体中驱动的横向尾场效应,等离子体密度分别为$2.1\times10^{14}$和\unit [ $7.7\times10^{14}$ ]{electrons/cm $^3$ }。我们发现,这些尾场周期性散焦质子束本身,一致的种子自调制过程的发展。我们表明,散焦增加沿束和沿等离子体通过使用时间分辨和时间积分测量的质子束横向分布。我们评估了横向尾场振幅,结果表明它们超过了其种子值(\unit [ $<$ 15]{MV/m}),并达到了\unit [300]{MV/m}以上。所有这些结果证实了种子自调制过程的发展,外部注入的低能量和加速的电子多GeV的能级的必要条件。

英文摘要:

We measure the effects of transverse wakefields driven by a relativistic proton bunch in plasma with densities of $2.1\times10^{14}$ and \unit[$7.7\times10^{14}$]{electrons/cm$^3$}. We show that these wakefields periodically defocus the proton bunch itself, consistently with the development of the seeded self-modulation process. We show that the defocusing increases both along the bunch and along the plasma by using time resolved and time-integrated measurements of the proton bunch transverse distribution. We evaluate the transverse wakefield amplitudes and show that they exceed their seed value (\unit[$<$15]{MV/m}) and reach over \unit[300]{MV/m}. All these results confirm the development of the seeded self-modulation process, a necessary condition for external injection of low energy and acceleration of electrons to multi-GeV energy levels.

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