Laser-driven ion acceleration,as produced by interaction of a high-intensity laser with a target,is a growing field of interest.One of the current challenges is to enhance the acceleration process,i.e.,to increase the...Laser-driven ion acceleration,as produced by interaction of a high-intensity laser with a target,is a growing field of interest.One of the current challenges is to enhance the acceleration process,i.e.,to increase the produced ion energy and the ion number and to shape the energy distribution for future applications.In this paper,we investigate the effect of helical coil(HC)targets on the laser-matter interaction process using a 150 TW laser.We demonstrate that HC targets significantly enhance proton acceleration,improving energy bunching and beam focusing and increasing the cutoff energy.For the first time,we extend this analysis to carbon ions,revealing a marked reduction in the number of low-energy carbon ions and the potential for energy bunching and post-acceleration through an optimized HC design.Simulations using the particle-in-cell code SOPHIE confirm the experimental results,providing insights into the current propagation and ion synchronization mechanisms in HCs.Our findings suggest that HC targets can be optimized for multispecies ion acceleration.展开更多
In order to solve the problem, which may be encountered by those former schemes, such as six accelerometer, nine accelerometer configuration, under specific conditions, a ten accelerometer configuration was pre...In order to solve the problem, which may be encountered by those former schemes, such as six accelerometer, nine accelerometer configuration, under specific conditions, a ten accelerometer configuration was presented to compute the rotational and translational accelerations of a rigid body, based on well known kinematics principles. The theoretical analysis shows that the configuration can meet the requirement. The simulation results of this scheme show promise for measuring a rigid body's rotational and translational accelerations.展开更多
导航系统依赖传感器感知周围环境。当前,基于单一传感器的导航系统已难以满足各类复杂场景下的导航需求,导航系统正朝传感器多源化方向发展。在多源传感器数据融合过程中,图像数据的处理最消耗时间和资源,对系统性能影响最大。为解决这...导航系统依赖传感器感知周围环境。当前,基于单一传感器的导航系统已难以满足各类复杂场景下的导航需求,导航系统正朝传感器多源化方向发展。在多源传感器数据融合过程中,图像数据的处理最消耗时间和资源,对系统性能影响最大。为解决这些问题,设计智能导航平台的硬件控制终端,利用基于全球卫星导航系统(Global Navigation Satellite System,GNSS)秒脉冲(Pulse Per Second,PPS)的时间同步,实现多源传感器数据融合;设计用于同步定位与地图构建(Simultaneous Localization And Mapping,SLAM)前端ORB(Oriented FAST and Rotated BRIEF)特征提取加速器,加速图像处理过程,提高SLAM系统的实时性。实验结果表明,硬件平台不仅支持GNSS、惯性测量单元(Inertial Measurement Unit,IMU)、视觉和激光雷达的数据采集和融合,还能加速图像ORB特征点提取。在执行图像ORB特征提取任务时,与CPU和GPU平台上的实现相比,该加速器的帧率分别达到了它们的2.7倍和1.8倍,而功耗仅为它们的5.1%和2.9%。展开更多
基金supported by the CEA/DAM Laser Plasma Experiments Validation Project and the CEA/DAM Basic Technical and Scientific Studies Projectsupported by the National Sciences and Engineering Research Council of Canada(NSERC)(Grant Nos.RGPIN-2023-05459 and ALLRP 556340-20)+3 种基金the Digital Research Alliance of Canada(Job pve-323-ac)the Canada Foundation for Innovation(CFI)the Ministère de l’Économie,de l’Innovation et de l’Énergie(MEIE)from QuébecThis study was granted access to the HPC resources of IRENE under allocation Grant No.A0170512899 made by GENCI.We acknowledge the financial support of the IdEx University of Bordeaux/Grand Research Program“GPR LIGHT”and of the Graduate Program on Light Sciences and Technologies of the University of Bordeaux.
文摘Laser-driven ion acceleration,as produced by interaction of a high-intensity laser with a target,is a growing field of interest.One of the current challenges is to enhance the acceleration process,i.e.,to increase the produced ion energy and the ion number and to shape the energy distribution for future applications.In this paper,we investigate the effect of helical coil(HC)targets on the laser-matter interaction process using a 150 TW laser.We demonstrate that HC targets significantly enhance proton acceleration,improving energy bunching and beam focusing and increasing the cutoff energy.For the first time,we extend this analysis to carbon ions,revealing a marked reduction in the number of low-energy carbon ions and the potential for energy bunching and post-acceleration through an optimized HC design.Simulations using the particle-in-cell code SOPHIE confirm the experimental results,providing insights into the current propagation and ion synchronization mechanisms in HCs.Our findings suggest that HC targets can be optimized for multispecies ion acceleration.
文摘In order to solve the problem, which may be encountered by those former schemes, such as six accelerometer, nine accelerometer configuration, under specific conditions, a ten accelerometer configuration was presented to compute the rotational and translational accelerations of a rigid body, based on well known kinematics principles. The theoretical analysis shows that the configuration can meet the requirement. The simulation results of this scheme show promise for measuring a rigid body's rotational and translational accelerations.
文摘导航系统依赖传感器感知周围环境。当前,基于单一传感器的导航系统已难以满足各类复杂场景下的导航需求,导航系统正朝传感器多源化方向发展。在多源传感器数据融合过程中,图像数据的处理最消耗时间和资源,对系统性能影响最大。为解决这些问题,设计智能导航平台的硬件控制终端,利用基于全球卫星导航系统(Global Navigation Satellite System,GNSS)秒脉冲(Pulse Per Second,PPS)的时间同步,实现多源传感器数据融合;设计用于同步定位与地图构建(Simultaneous Localization And Mapping,SLAM)前端ORB(Oriented FAST and Rotated BRIEF)特征提取加速器,加速图像处理过程,提高SLAM系统的实时性。实验结果表明,硬件平台不仅支持GNSS、惯性测量单元(Inertial Measurement Unit,IMU)、视觉和激光雷达的数据采集和融合,还能加速图像ORB特征点提取。在执行图像ORB特征提取任务时,与CPU和GPU平台上的实现相比,该加速器的帧率分别达到了它们的2.7倍和1.8倍,而功耗仅为它们的5.1%和2.9%。
