先进Laser应用中心laser驱动离子加速束线的调试
Commissioning of the laser-driven ion acceleration beamline at the Centre for Advanced Laser Applications
摘要：
位于慕尼黑附近Garching的先进激光应用中心（CALA）采用ATLAS 3000激光系统，该系统可在20，fs的脉冲长度内提供高达3，PW的激光。它是激光驱动离子（LION）光束线的驱动器，旨在加速质子和碳的应用。对于调试，我们目前在28\，fs中以5\，J的目标运行。$20\degree$离轴抛物柱面镜将直径为28cm的激光束聚焦到微米大小的光斑，其中真空兼容的波前传感器与可变形反射镜结合使用以实现聚焦优化。纳米箔靶定位系统（nFTPS）可以以高达0.5Hz的重复率替换靶，并存储多达19种不同的靶箔。广角光谱仪配置中的偶极磁体将离子偏转到CMOS检测器上以进行在线读出。调试于2019年年中开始，使用纳米薄塑料箔作为目标进行常规质子加速。从那时起，质子截止能量超过20MeV已定期实现。从实验返回到激光器中的光量被不断地监测，并且目标上的5J被确定为电流极限，以防止激光器中的损坏。在给定的激光参数下，动能为12，MeV的质子得到了稳定的加速，并适合于用永磁体四极子向我们的应用平台输运。我们已经进行了参数扫描不同的目标厚度，以优化最高和最稳定的质子数在12\，MeV的动能，并调查拍摄到拍摄粒子数的最佳参数的稳定性。
英文摘要：
The Centre for Advanced Laser Applications (CALA) in Garching near Munich features the ATLAS 3000 laser system, which can deliver up to 3\,PW within a pulse length of 20\,fs. It is the driver for the Laser-driven ION (LION) beamline, which aims to accelerate protons and carbons for applications. For commissioning, we currently operate with 5\,J on target in 28\,fs. A $20\degree$ off-axis parabolic mirror focuses the 28\,cm diameter laser-beam down to a micrometer-sized spot, where a vacuum-compatible wave-front sensor is used in combination with a deformable mirror for focus optimization. The nano-Foil Target Positioning System (nFTPS) can replace targets with a repetition rate of up to 0.5\,Hz and store up to 19 different target foils. A dipole magnet in a wide-angle spectrometer configuration deflects ions onto a CMOS detector for an online read-out. Commissioning started mid 2019 with regular proton acceleration using nm-thin plastic foils as targets. Since then proton cut-off energies above 20\,MeV have been regularly achieved. The amount of light traveling backwards from the experiment into the laser is constantly monitored and 5\,J on target have been determined as the current limit to prevent damage in the laser. Protons with a kinetic energy of 12\,MeV are stably accelerated with the given laser parameters and are suitable for transport with permanent magnet quadrupoles towards our application platform. We have performed parameter scans varying target thicknesses to optimize for highest and most stable proton numbers at 12\,MeV kinetic energy, and investigated shot-to-shot particle number stability for the best parameters.
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