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4月21日外宾学术报告：Fundamental and Applied Research Opportunities using Laser Wakefield Accelerators

来源： 发布时间：2025-04-17【字体：大 中 小】

报告人：Nasr A. M. Hafz, The Extreme Light Infrastructure ERIC, ALPS Facility, ELI-HU Non-Profit Ltd.

会议时间：2025年04月21日（周一） 上午9:30

会议地点：清河路390号 王大珩厅

报告内容：

At ELI ALPS we have two beamlines for laser wakefield acceleration (LWFA), eSYLOS, and ePW. SYLOS laser systems generate approximately 40-100mJ laser pulses at 1kHz with a pulse duration of 9~13 fs at the central wavelength of 850 nm with a bandwidth of about 300 nm. The eSYLOS beamline was commissioned and has been available for external users since 2024 via regular ELI ERIC user calls. Electron beams from eSYLOS are up to 50 MeV 1pC per shot (~1nC/s) 10 mrad divergence angle and operating at 1kHz repetition rate. The eSYLOS beams are highly stabilized in terms of beam parameters especially, the beam pointing angle and average energy spectrum allowing for some applications. User applications of the 1kHz operation of eSYLOS are currently in the areas of radiobiology and positron beam generation for industrial benefits.

On the other hand, ePW beamline is the high-energy LWFA beamline at ELI ALPS; it is currently under commissioning and is expected to be announced for external users in 2026. The ePW accelerator is driven by the Ti: Sapphire High-Field PW laser system which is planned to be operating at 30 J output energy at 10 Hz repetition rate in its final phase of operation (2026-2027), allowing for applications such as fast- betatron X-ray computerized tomography for basic and applied research. Currently, the HF-PW laser system delivers 7-10 J laser pulse energy after compression ~21 fs pulse duration at a 2.5 Hz repetition rate. The ePW focusing OAP is an f/50 focusing with an available 25 fs plasma probing beam for online interferometry and shadowgraphy. The design of the ePW LWFA system provides a wide range of fundamental and applied research areas, including 2.5~10 Hz microcomputed tomography of objects using 10s keV betatron X-rays expected to be produced with the ePW's GeV-class electron beams. The ePW beamline also allows for multi-beam LWFA experiments as well as the inverse-Compton Scattering/collision of TW laser pulses with GeV electron beams for QED investigations and other areas of LWFAs of multi-GeV electron beams.

In this seminar the speaker will discuss the above topics.

Keywords: laser wakfield accelerator, SYLOS lasers, HF PW laser, eSYLOS, ePW

报告人简介:

Nasr教授2001年博士毕业于日本东京大学，2002年至2011年分别在韩国电器研究院和光州科学技术研究所开展利用太瓦至百太瓦激光器进行激光-等离子体加速器的研发工作。之后于2011年3月至2018年12月就职于上海交通大学物理与天文学院，被聘为特别研究员，开展了强场激光与物质相互作用的研究工作。目前Nasr教授为欧盟极端光学基础设施阿秒光脉冲源研究所（Extreme Light Infrastructure, ELI-ALPS Research Institute）的首席科学家，电子加速组组长。他的研究方向主要包括：激光等离子体电子加速及X射线产生；强场物理条件下基于激光等离子体相互作用的相对论电动力学（同步辐射和汤姆孙散射）；基于激光与物质相互作用的伽马射线和正电子束产生；超快激光等离子体、粒子束及辐射源的诊断与标定等。

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