强流重离子束驱动的高能量密度物理研究进展

强流高能离子束可以准等容加热任何高密度样品,制备出尺度大、状态均匀、内部无冲击波的高能量密度物质,为实验室研究高能量密度物理提供了一种独特的新手段。介绍了国内外典型的强流重离子加速器装置及其与高能量密度物理相关的关键参数设计和研究规划;展示了基于粒子和流体模拟的离子束驱动高能量密度物质产生和状态演化规律进展;介绍了一套兼具高时空分辨和高穿透力的高能电子成像诊断技术;分析了中低能区离子束与等离子体相互作用过程中的碰撞和电荷交换微观机制,以及激光加速超短超强离子束在等离子体中的非线性输运和欧姆能损机制。

4-15 Energy Deposition and Excitation of Wake eld in Case of 100 keV/u Ion Beam Passing through a Plasma Target

Recently our team investigated the energy deposition and excitation of wakefield in case of hundreds keV proton/helium ion beams passing a gas-discharged plasma target. The plasma target was produced by igniting an electric discharge of hydrogen gas in two-collinear quartz tubes, each of 5 mm in diameter and 78 mm in length, the electrical current even up to kA will flow in two opposite directions in either of the two quartz tubes.

4-21 Numerical Simulation of Intense Heavy Ion-target Interaction

High power laser facility has been widely used for the high energy density physics (HEDP) research for years. Recently, the development of intense heavy ion beam accelerators opened a new way for heavy ion-driven HEDP research. Due to the special energy deposition mechanism of heavy ion beams, large volume of uniform high energy density matter could be obtained for fundamental physical research such as equation of state study.

4-16 High Energy Density Research at the Future Project HIAF in China

A large scale scienti c research platform, named the High Intensity heavy-ion Accelerator Facility (HIAF), was proposed in light of the trend and development in nuclear physics and the associated high energy heavy ion research elds. HIAF is one of the 16 approved national projects for basic sciences and technologies as the 12th ve-year-plan in China; it will be a laboratory open to the outside world, similar to CSR which was built as the 9th ve-year-plan in China[1].

4-19 X-ray Emission for 424 MeV/u C Ions Impact Selected Targets

In inertial Confinement Fusion (ICF), X-ray radiation drives the implosion requiring not only sufficient conversion efficiency of the drive energy to the X-ray but also the highly spatial symmetry. Consequently, it is important to investigate the X-ray radiation in the interaction of high energy heavy ions beam with solid target. In this work,we investigate the X-ray emission induced by high energy heavy ions.

4-17 Investigations on Interaction between Low Energy Heavy Ion Beams and Hydrogen Plasma

The interaction between ion beam and matter is one of the most important topics in atomic physics and nuclear physics. It is indeed a requirement for a deeper understanding of the interaction processes. Especially the energy deposition by an intense heavy ion beam with the low energy impinging into a degenerate matter, which is related to the topics of warm dense matter, fast ignition process and helium ions self-heating in the fusion process.

4-22 Development and Test of an Ultrafast eight-channel Pyrometer for Temperature Diagnostics of High-energy-density Matter

A study of the fundamental properties of high-energy-density (HED) matter is of considerable important as it has wide application to various branches of the basic and applied science. The study will enable one to probe the validity of existing theories on stellar formation and evolution, compressibility of inertial fusion targets and check the correctness of existing models for strongly coupled high density plasma[1;2].

4-24 Ionization of Ar11+ Ions during the Ion-surface Collisions

X-ray emission analysis provides us an effective method to investigate the inner-shell process of ion-atom collisions.Near the Bohr velocity, the projectile, having enough kinetic energy, interacts with the target atoms at a closedistance below the surface. Except for neutralization, it may be ionized. Not only the inner-shell ionization, butalso the outer-shell may be multiple ionized. This results in the X-ray energy shift and the change of fluorescenceyield[1??3]. Here, we would like to present the evolvement of the Ar11+ ions in collisions near the Bohr velocity.

离子在等离子体中的电荷态分布与尾场调制效应研究

Plasma,called the fourth form of matter,not only plays an important role in astrophysics,but also becomes the new interest in atomic physics,material science and other aspects.Ion beam–plasma interaction can be a new solution to understand the plasma properties.For instance the collision of ion and free electrons dominate in plasma,which can induce the higher energy loss and the change of charge state,as well as the wake-field can modify the ion beam from a continues mode to a pulsed mode with a focused/unfocused spot.

离子束与等离子体相互作用与高能量密度物理研究新型诊断技术进展

Plasma as the fourth state of matter widely exists in universe and it is the essential state in the process of Initial Confinement Fusion sciences.Ion beam is a unique tool to understand some special properties of plasma itself form the aspect of kinetic interaction between ion and plasma surrounding.The energy loss of helium ions in a dense plasma relates to the self-heating process in a ICF capsule and the radiation protection by Van Allen Radiation Belt of Earth-self against the solar wind.It is a very interesting topic to carry out the series of experiments applying the ion beam and plasma target together in lab[1,2].

3-17 Incident Ion Charge State Dependence of the Visible Light Emission of Xe^q+Ions Bombarding Aluminum

Slow highly charged ions(HCIs)interaction with the solid also provides information such as electron configuration,multi-interaction,ionization,excitation and charge transfer for the basic research[1??3].What is more,the understanding on the heavy HCI structure and relevant collision processes has a special meaning for inertial confinement fusion(ICF)research.Up to now,many experiments or theories in ion-solid collisions focus on the investigation of secondary electrons,sputtering ion or characteristic X-rays emission by the slow projectile[4].

数字经济赋能低碳发展的研究

低碳发展是我国现代化的必由之路,数字经济作为新时代发展方向,理应为低碳发展作出贡献。基于我国2011—2021年30个省份的面板数据,从影响效应、作用机制揭示数字经济如何赋能低碳发展,并通过多种计量模型进行实证检验。研究发现,数字经济能够显著降低碳排放强度,并且在稳健性检验下依旧成立;作用机制发现,数字经济可以通过科技创新水平、产业结构合理化赋能低碳发展;异质性表明,东部、中部、西部地区数字经济的发展能够显著降低碳排放强度,数字经济发展水平相对更低的地区低碳作用更加显著。

基于HIAF装置的高能量密度物理研究

高能量密度物理的研究对象是能量密度超过1011J/m3或压强超过100 GPa极端状态的物质,这种物质广泛存在于恒星和大质量行星内部,同时也短暂存在于核弹爆炸和惯性约束聚变等高功率加载过程中.高能量密度物理研究是科技强国在国防安全、天体物理及聚变科学技术等重大领域竞相追逐的前沿热点,也是国内外大型高功率激光装置、Z箍缩装置以及重离子加速装置的重要科学目标.本文将主要介绍基于强流重离子加速器装置(High Intensity heavy-ion Accelerator Facility,HIAF)的高能量密度物理研究.HIAF装置将可以提供极高功率的强流重离子束,单脉冲能量和功率将分别达到100 kJ和TW量级.如此高功率的离子束直接加热金、铅等固体材料,可以产生密度接近原固体密度、温度约10 eV、空间尺度mm–cm量级的状态均匀的高能量密度物质(能量密度达到1013J/m^(3)量级),为实验室研究高能量密度物质的产生、物态性质及其演化规律提供先进的研究平台.基于HIAF的高能量密度物理研究主要包括:(1)强流离子束驱动高能量密度物质的产生及其发展规律;(2)离子束在稠密物质或等离子体中的能量沉积与输运性质;(3)离子束驱动高能量密度物质关键诊断技术.本文还将重点介绍上述三个关键科学技术问题的研究现状和进展.

势能助力靶原子离化激发辐射近红外光谱

用动能为1360 keV的129Xeq+(q=17,20,23,25,27)高电荷态离子分别入射到金属Al和Ti固体靶表面,测量高电荷离子与表面相互作用过程中离子俘获表面电子完成中性化所形成的激发态Xe原子和低电离态Xe离子退激辐射的近红外光谱线(800~1700 nm),以及靶原子被离化激发、退激辐射的光谱线。实验结果表明:高电荷态离子入射金属表面的过程中,携带的势能在飞秒量级的时间内沉积到靶表面,使靶原子离化激发,较强的库仑势能可使靶原子形成高离化态和复杂的电子组态、退激辐射光谱线。随着入射离子的电荷态增加,测量谱线的强度增大,该变化趋势与入射离子的势能随电荷增加的变化趋势大体一致,说明经典过垒模型在近玻尔速度能区是成立的。