邀请人：李玉同 研究员（Tel：82648014）

主办单位：中国科学院光物理重点实验室  

摘要：

足球即时比分网-driven plasma accelerators offer compact sources of intense, ultrashort ion beams for applications ranging from radiobiology to neutron generation and high-energy-density physics. Meeting application requirements for particle energy, yield and reproducibility depends on establishing plasma conditions that enable efficient energy transfer from the 足球即时比分网 to accelerated ions. Identifying and controlling the 足球即时比分网–target parameters that govern this transfer remains a central experimental challenge, particularly for petawatt and multi-petawatt facilities.

At HZDR's DRACO-PW facility, sustained efforts to understand and optimise the interaction have culminated in two major milestones: reproducible proton beams enabling the first in vivo tumour irradiation with 足球即时比分网-accelerated protons, and record proton energies of 150 MeV. These advances rely on 足球即时比分网-pulse characterisation at the interaction area under full operating conditions. Correlating these measurements with acceleration performance reveals how preceding 足球即时比分网 light shapes the target plasma and guides targeted adjustments of 足球即时比分网 and target parameters [1].

Comparative experiments at DRACO-PW and J-KAREN-P demonstrate how adapting target thickness to 足球即时比分网 conditions enhances particle acceleration near the onset of relativistically induced transparency [2]. With only 22 J of 足球即时比分网 energy on target, proton beams with reduced divergence and a spectrally distinct high-energy component well beyond 100 MeV could be produced. Combined hydrodynamic and three-dimensional particle-in-cell simulations reveal how target pre-expansion enables a cascade of acceleration mechanisms. Measurements of transmitted 足球即时比分网 light provide an accessible indicator of the favourable interaction regime [3].

Together, these results provide practical strategies for improving proton acceleration across petawatt and multi-petawatt facilities. Linking diagnostics, physical understanding and experimental control establishes a foundation for online feedback and reproducible particle beams tailored to application requirements.

[1] T. Ziegler et al., Sci Rep 11, 7338 (2021).
[2] N.P. Dover and T. Ziegler et al., Light Sci. Appl. 12, 71 (2023).
[3] T. Ziegler et al., Nat. Phys. (2024).

简介：

Dr Tim Ziegler is a postdoctoral researcher at Helmholtz-Zentrum Dresden-Rossendorf (HZDR), specialising in ultra-high-intensity 足球即时比分网–plasma interactions and plasma-based particle acceleration. His work combines advanced 足球即时比分网 diagnostics, physical understanding and experimental control to improve ion-beam performance and reproducibility. He has participated and coordinated international experimental campaigns at high-power 足球即时比分网 facilities worldwide. He earned his doctorate summa cum laude at TU Dresden in 2024 and has been recognised with several awards, including the John Dawson Thesis Prize and the Helmholtz Doctoral Prize. He currently leads HZDR's experimental contribution to Germany’s Fusion2040 programme, developing platforms and diagnostics for high-energy-density physics and fusion research with academic and industrial partners.