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4月10日外宾学术报告： Laser-Ion acceleration in plasmas and short bunch applications

来源： 发布时间：2024-04-05【字体：大 中 小】

报告人：Prof. Joerg Schreiber, LMU Munich

会议时间：2024年4月10日（周三）上午10:00

会议地点：溢智厅

报告内容：

Chirped pulse amplification (CPA) laser systems, exemplified by the Advanced Titanium-Sapphire Laser (ATLAS) operated in the Centre for Advanced Laser Applications (CALA) at the Ludwig-Maximilians-University (LMU) Munich, are capable of generating laser pulses with Petawatt peak power and ~30 fs duration. When focused tightly onto targets, typically (sub-)micrometer thin foils, these pulses ionize and subsequently induce relativistic electron motion which separates electrons from ions. The emerging rectified fields of order ~MV/µm results in rapid acceleration of dense ion bunches.

This presentation will explain the physical processes involved and elucidate the characteristics of ion sources, in particular the accessible energy distributions using current technology [1]. The ultrashort pulse enables acceleration within less than one picosecond, ensuring a similar precise synchronization of the bunch with the laser – a pivotal aspect for new application possibilities. Notably, this synchronization allows for time-resolved investigations of post-proton energy deposition processes within targets such as water [2]. The intense plasma fields also facilitate ionization of heavy ions into high charge states. Recent observations include the acceleration of Neon-like gold to MeV/u kinetic energies, along with initial indications of fission within the microscopic plasma [3].

At CALA, our active focus lies in pushing the boundaries of technology to leverage the potential applications of laser-plasma acceleration. Our efforts encompass the development of instrumentation capable of characterizing the spatial and energy distributions of individual, intense ion bunches using ultrasound pulses [4]. We are now working on providing fresh laser-ion converters, known as targets, with the repetition rate of 1 Hz dictated by the PW-laser. These advancements mark a significant step towards practical implementation, aiming to spark curiosity and stimulate engaging discussions.

报告人简介：

Prof. Joerg Schreiber, received his Diploma in physics on studies with high power laser pulses at the University of Jena. After completing his PhD-studies and a short post-doctoral phase on laser-driven ion acceleration at the Ludwig-Maximilians-University (LMU) and the Max-Planck-Institute for Quantumoptics (MPQ) in Garching, he investigated relativistic plasma physics as a DAAD-PostDoc-fellow at the Imperial College in London. On his return to Germany, he accepted a position at the MPQ as team leader for laser-ion acceleration, particularly to realize the first ion-cell-irradiation study. Since 2011, Joerg Schreiber is associated Professor at the chair of medical physics of the LMU. Amongst his responsibilities is the installation and the realization of laser-driven sources at the Center for Advanced Laser Applications (CALA).

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