Helicon wave physics for the development of a helicon plasma cell for particle-driven wakefield accelerators

直线粒子加速器通过电场中的梯度来加速粒子。等离子体尾波场加速器提供的梯度比传统的线性粒子加速器高几个数量级，从而显著减小了所需的尺寸，从而为各种应用提供了负担得起的紧凑型加速器。高电场要求高等离子体密度。众所周知，螺旋管放电在线性几何中提供最高的密度。在格雷夫斯瓦尔德开发的普罗米修斯-A原型实验已经证明了所需的高密度。在这种特殊的高密度下，螺旋管放电的物理特性不同于传统的螺旋管放电。基于斯图加特的程序开发，我们将开发一个程序来了解波的传播和耗散，与梯度的相互作用和等离子体边界的影响。首先，该代码将通过与常规等离子体密度下的实验(格雷夫斯瓦尔德的Vineta装置)以及后来的高密度下的实验(现已在欧洲核子研究中心的普罗米修斯-A)进行比较来开发。最后，该代码可用于针对粒子驱动的尾场密度要求来优化螺旋管放电。

Linear particle accelerators accelerate particles by gradients in the electric field. Plasma wakefield accelerators provide gradients several orders of magnitude higher than conventional linear particle accelerators significantly reducing the required size, thereby promising affordable and compact accelerators for various applications. The high electric fields require high plasma density. Helicon discharges are known to provide the highest densities in linear geometry. The prototype experiment PROMETHEUS-A developed in Greifswald has demonstrated the required high density. The physics of helicon discharges at this particular high density is different from those in conventional helicon discharges. Based on code developments in Stuttgart, we will develop a code to understand the wave propagation and dissipation, the interplay with the gradients and the impact of the plasma boundaries. First, the code will be developed with the help of comparisons with experiments at conventional plasma densities (the VINETA device in Greifswald), later to experiments at high densities (PROMETHEUS-A now at CERN). Finally, the code can be used to optimize helicon discharges towards particle-driven wakefield density requirements.