北京大学超小型激光加速器系统研究进展

Progress of compact laser plasma accelerator in Peking University

超强激光与等离子体相互作用可以获得高于传统加速器三个数量级以上的加速电场梯度,更加有效地加速离子,从而能够显著缩小加速器的体积和造价.鞘层加速(TNSA)和光压稳相加速(RPA)是目前研究得最多的两种主要激光加速机制.与鞘层加速相比,光压稳相加速的加速效率和离子能量更高、单能性更好.在提出光压稳相加速原理的基础上,北京大学正在建造一台基于该原理的超小型激光加速器系统.本文将介绍北京大学在激光加速研究方面的进展和激光加速器系统的研制情况,包括理论模拟、前期准备实验、自支撑纳米靶的制备以及离子输运线的初步设计.

When ultra short and intense laser interacts with plasma, the accelerating field gradient can be three order of magnitude higher than the conventional accelerator, which can accelerate the ion more efficiently. So the accelerator scale and cost can be reduced greatly. Among the various acceleration mechanisms, target normal sheath acceleration （TNSA） and radiation pressure acceleration （RPA） are the two main mechanisms widely studied. The RPA mechanism can produce energetic ion with higher energy, narrower energy spectrum and higher acceleration efficiency than TNSA. Peking University proposed RPA mechanism in phase stable regime and is building a Compact laser plasma accelerator （CLAPA） basded on this mechanism. This paper presents the progress of laser acceleration research and the development of laser accelerator including theoretical simulation, proof of principle experiments, self-supporting ultra-thin target fabrication and preliminary design of beam line.