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Ultrafastlight-2020 Book of Abstracts Book of Abstracts IV International Conference on Ultrafast Optical Science UltrafastLight-2020 September 28 – October 2, 2020 Lebedev Physical Institute, Moscow IV International Conference on Ultrafast Optical Science (UltrafastLight-2020), is the broad-scope, annual international symposium dedicated to the most im- portant aspects of ultrafast phenomena in different fields of natural sciences and engineering. The Conference topics: 1. Extreme light 2. Ultrafast phenomena in condensed matter and ionized gases 3. Ultrafast laser nanofabrication and nanophotonics 4. Femtosecond non-linear optics. Filamentation. High field THz generation. 5. Femtosecond radiation in spectroscopy and optical frequency metrology. 6. Physics and technology of ultrafast lasers and ultrashort laser pulses. Website: www.ultrafastlight.ru E-mail: [email protected] [email protected] Chair - Nikolay Kolachevsky (Lebedev Physical Institute), Vice-chair - Andrey Ionin (Lebedev Physical Institute), Vice-chair - Sergey Kudryashov (ITMO University / LPI) 1 2 Contents 3 4 Section 1: Extreme light Section Chair: Andrei Savel’ev , e-mail: [email protected] (Lomonosov Moscow State University, Russia) Program committee: Valery Bychenkov (LPI RAS, Moscow, Russia) Igor Kostuykov (IAP RAS, Nizhny Novgorod, Russi) Scope Laser plasma sources of ionizing radiation Nuclear photonics Extreme fields physics Ultra high intensity facilities 5 Oral Investigation of pre-pulse influence on high-Z plasma formation in experiments with high intense up to 1022 W/cm2 femtosecond laser pulses by means of X-ray spectroscopy M. A. Alkhimova1, A. Ya. Faenov1,2, T. A. Pikuz1,2, I. Yu. Skobelev1,3, 4 4 4 S. A. Pikuz1,3, A. S. Pirozhkov , M. Nishiuchi , N. P. Dover , H. Sakaki4, A. Sagisaka4, Ko. Kondo4, K. Ogura4, M. Ishino4, Y. Fukuda4, H. Kiriyama4, E. A. Vishnyakov6, A. O. Kolesnikov6, E. N. Ragozin6, A. N. Shatokhin6, M. Kando4, R. Kodama2,5 and K. Kondo4 1 Joint Institute for High Temperatures, Russian Academy of Sciences, Moscow, Russia; 2 Institute for Open and Transdisciplinary Research Initiatives, Osaka University, Osaka, Japan; 3 National Research Nuclear University “MEPhI”, Moscow, Russia 4 Kansai Photon Science Institute, QST, Kizugawa, Kyoto, Japan; 5 Institute of Laser Engineering, Osaka University, Osaka, Japan; 6 P. N. Lebedev Physical Institute of the Russian Academy of Sciences, Moscow, Russia e-mail: [email protected] 21 2 In experiments with laser fluxes on target reached Ilaser ≥ 5 × 10 W/cm the becomes very designed to control the pre-plasma [1]. Since pre-plasma plays an important role at these intensities and directly effects to physical processes in plasma and following experimental aims as consequence. In this work we demonstrate that x-ray spectroscopy diagnostic can be used for estimation tar- get integrity at the time of main laser pulse coming. That becomes possible because appeared spectral features may indicate the interaction of main laser pulses as with pre-plasma or solid target. We report about x-ray spectroscopy measurements that were done at recent experiments on the J-KAREN-P laser facility. First experiment was aimed to achieve efficient coherent soft x-ray gen- eration via high-order harmonics [2] and second was aimed to the investigation of proton acceleration mechanisms in ultra-relativistic laser plasmas [3]. In both cases, we measured x-ray emission from stainless steel plasma generated at the rather different experimental conditions and observed the high sensitivity of x- ray emission spectra to laser pulse contrast. As a result, we have been able to distinguish the existence or absence of pre-plasma in interaction of laser pulse with target. We found that x-ray emission intensity increases by power low with laser intensity on target as of ∼ I4:5 when the laser contrast K ≥ 1010 and as of ∼ I2 for K ∼ 106. We also shown the strong influence of plasma states formation on the laser focusing. The reported study was funded by RFBR according to the research project N 20-02-00790. references [1] Nakamura et al., PRL 108, 195001 (2012). [2] Teubner and Gibbon, Rev. Mod. Phys. 81, 445 (2009). [3] Dover N. P. et al., PRL 124 (8), 084802 (2020). 6 Invited Compact laser-plasma sources of ultra-relativistic electrons N. E. Andreev1,2 1 Joint Institute for High Temperatures of the Russian Academy of Sciences, Moscow, Russia; 2 Moscow Institute of Physics and Technology (State University), Dolgoprudny, Moscow Region, Russia e-mail: [email protected] High energy electrons and hard X-rays, produced in the interaction of rel- ativistically intense laser pulses with matter, open a new approach to creation and diagnosis of extreme states of matter. The elaboration of compact sources of ultra-relativistic electrons and hard X-rays requires the development of advanced acceleration methods based on high gradient acceleration mechanisms. In view of current and future experiments, various methods of electrons acceleration in plasma are discussed. One of the actively developing approach is based on the use of wake fields generated in rarified plasma under the action of relativistically intense femtosec- ond laser pulses. Acceleration of electrons to ultra-relativistic energies up to the TeV range with a large acceleration gradient, much higher than that available in conventional radio frequency accelerators, can be achieved in a multistage laser wakefield accelerator, operating in a moderately nonlinear mode. The properties of accelerated electron bunches are investigated on the base of analytical models and numerical simulations [1]. In the case of denser plasmas, the effective transfer of the laser energy to hot electrons was demonstrated by the use of structured targets. The direct laser acceleration mechanism in a plasma channel, created by a relativistically-intense subpicosecond laser pulse in a plasma with a near critical density, is analyzed for the laser and target parameters in recent experiments on the PHELIX laser system at GSI (Darmstadt, Germany). The efficient generation of high-energy electrons with an energy of tens of MeV demonstrated experimentally was sup- ported by numerical modeling. These collimated beams of high energy electrons reach effective temperatures, which are many times higher than those predicted by Wilks ponderomotive scaling and carry mega-ampere current with charges of hundreds of nC [2]. This work was partially supported by the Presidium of the RAS (Fundamental Research “Programm Extreme Light Fields and Their Interaction with Matter”) and RFBR (Grant No. 19-02-00908). references [1] M. E. Veysman, N. E. Andreev, Quantum Electronics 50 (4), 392–400 (2020). [2] O. N. Rosmej, N. E. Andreev, S. Zaehter et al, New J. Phys. 21, 043044 (2019). 7 Invited Tuning laser wakefield acceleration at few-mJ kHz laser by varying pulse duration and tailoring gas profile I. A. Andriyash, L. Rovige, A. Vernier, J. Huijts and J. Faure Laboratoire d’Optique Appliqu´ee,ENSTA–CNRS–Ecole Polytechnique, Palaiseau, France e-mail: [email protected] Laser wakefield acceleration or simply laser-plasma acceleration (LPA) of elec- trons is a process, in which an ultrashort laser is focused into a gas, and ionising it drives the plasma waves with strong accelerating fields. Today, we can distin- guish the LPA concepts based on the highest possible laser powers & 1 PW, and the alternative ones which involve the kHz laser systems with few-TW power. The existing multi-mJ kHz laser systems are now able to compress the pulses into almost single-cycle beamlets, and with tight focusing to reach intensities suitable to drive wakefield acceleration [1-5]. Operating in the kHz regime, such sources provide a very high average current, which makes them of a great inter- est for ultrafast electron diffraction [6-8], irradiation experiments for radiation harness studies [9] or radio-biology [10,11]. Figure 1: LPA with 4 fs (upper left) and 10 fs (lower left) laser: plasma density (gray), accelerating field (blue), electrons from self-injection (red) and ionization injection (green). Design of the nozzle with asymmetric shock (upper right), and shadowgraphic image of the plasma (lower right). Wakefield acceleration and associated electron injection in the case of a few- cycle few-mJ laser may occur in a wide range of regimes providing beams with different charge, energy spectral and angular profiles. In this contribution, we present recent experimental and modeling results obtained at Salle Noire kHz laser system of LOA. We discuss transitions between the self-modulated and matched LPA modes by tuning laser duration from 4 fs to 10 fs (Fig. ?? left), and tailoring of gas density profile for enhanced stability (Fig. ?? right). references [1] Z.-H. He, B. Hou, J. H. Easter et al, New J. Phys., 15, 053016 (2013). [2] B. Beaurepaire, A. Vernier, M. Bocoum et al, Phys. Rev. X, 5, 031012 (2015). 8 Invited [3] J Faure, D Gustas, D Gu´enotet al, PPCF, 61(1), 014012 (2019). [4] D. Gu´enot,D. Gustas, A. Vernier et al, Nat. Photon., 11, 293 (2017). [5] D. Gustas, D. Gu´enot,A. Vernier et al, Phys. Rev. AB, 21, 013401 (2018. [6] Z.-H. He, A. G. R. Thomas, B. Beaurepaire et al, APL, 102, 064104 (2013). [7] Z.-H He, B. Beaurepaire, J. A. Nees et al Sci. Rep., 6. 36224 (2016). [8] J. Faure, B. van der Geer, B. Beaurepaire et al, Phys. Rev. AB, 19, 021302 (2016). [9] B. Hidding, O. Karger, T. K¨onigsteinet al, Sci. Rep., 7, 24354 (2017). [10] O. Rigaud, N. O. Fortunel, P. Vaigot et al, Cell Death & Disease, 1(9), e73 (2010). [11] O. Lundh, C. Rechatin, J. Faure et al, Medical Physics,
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