Article
Physics, Fluids & Plasmas
Ocean Zhou, Hai-En Tsai, Tobias M. Ostermayr, Liona Fan-Chiang, Jeroen van Tilborg, Carl B. Schroeder, Eric Esarey, Cameron G. R. Geddes
Summary: The study demonstrates that the curvature of the nozzle diverging section significantly impacts shock formation and gas jet density field, showing its importance in LPA gas jet design. Bell nozzles are capable of producing focused regions of high-density gas, while trumpet nozzles can produce flat-top profiles with correct optimization and slightly wider edges. Curvature is a crucial parameter for nozzle design and plays a key role in the formation of shock waves and density profiles.
PHYSICS OF PLASMAS
(2021)
Article
Nuclear Science & Technology
Qiu-Shi Liu, Ming-Jiang Ma, Bao-Zhen Zhao, Xiao-Hua Zhang, Chong Lv, Xiang-Hao Meng, Ji Zhang, Xiao-Na Ban, Zhao Wang, Xiao-Feng Xi, Bao-Xian Tian, Chuang-Ye He, Bing Guo
Summary: The study utilized a modified Nomarski interference diagnosis system to obtain interference images and density profiles of different supersonic gas-jet targets, investigating the relationships between gas density and back pressure, nozzle structure, and other key parameters to facilitate meeting various LWFA requirements.
NUCLEAR SCIENCE AND TECHNIQUES
(2021)
Article
Multidisciplinary Sciences
Sanghoo Park, Wonho Choe, Hyungyu Lee, Joo Young Park, Jinwoo Kim, Se Youn Moon, Uros Cvelbar
Summary: This study investigates the impact of gas jets on a water surface and the stabilizing effect of weakly ionized gas on cavities. Experimental results demonstrate that plasma bullets generated by weakly ionized gas can exert more force on the water surface through electrohydrodynamic flow, leading to cavity expansion without destabilization.
Article
Physics, Fluids & Plasmas
H. Bohlin, F-E Brack, M. Cervenak, T. Chodukowski, J. Cikhardt, J. Dostal, R. Dudzak, J. Hubner, W. Huo, S. Jelinek, D. Klir, F. Kroll, M. Krupka, M. Krus, T. Pisarczyk, Z. Rusiniak, U. Schramm, T-H Nguyen-Bui, S. Weber, A. Zaras-Szydlowska, K. Zeil, D. Kumar, T. Schlegel, V Tikhonchuk
Summary: This experiment studied the interaction of supersonic laser-generated plasma jets with a secondary gas target, characterizing the plasma parameters of the jets and resulting shock through various diagnostic techniques. It was found that the topology of the ambient plasma density significantly affected the formation and radiation characteristics of the jets and shock. Comparisons with radiation hydrodynamic simulations provided further insights into the physical processes underlying the formation and evolution of the jets and shock.
PLASMA PHYSICS AND CONTROLLED FUSION
(2021)
Article
Physics, Multidisciplinary
A. F. A. Bott, L. Chen, G. Boutoux, T. Caillaud, A. Duval, M. Koenig, B. Khiar, I Lantuejoul, L. Le-Deroff, B. Reville, R. Rosch, D. Ryu, C. Spindloe, B. Vauzour, B. Villette, A. A. Schekochihin, D. Q. Lamb, P. Tzeferacos, G. Gregori, A. Casner
Summary: Our experiment at the LMJ-PETAL facility achieved the first magnetized, turbulent, supersonic plasma with a large magnetic Reynolds number (Rm 45) in the laboratory. However, the amplification of initial seed magnetic fields was only moderate and not dynamically significant, with a notable absence of magnetic energy at scales smaller than the outer scale of the turbulent cascade. Our results suggest that moderately supersonic, low-magnetic-Prandtl-number plasma turbulence is less efficient at amplifying magnetic fields compared to its subsonic, incompressible counterpart.
PHYSICAL REVIEW LETTERS
(2021)
Article
Multidisciplinary Sciences
Omri Seemann, Yang Wan, Sheroy Tata, Eyal Kroupp, Victor Malka
Summary: The high intensities reached by powerful lasers today allow us to explore the interaction with matter in the relativistic regime, pushing the frontiers of plasma physics. Refractive-plasma optics are being used in laser plasma accelerators, but their use for spatial phase control of the laser beam has not been successful due to manufacturing complications. However, this concept has now been successfully demonstrated, enabling phase manipulation near the focus position, where the intensity is already relativistic, and offering flexible control for high-intensity high-density interactions.
NATURE COMMUNICATIONS
(2023)
Article
Physics, Fluids & Plasmas
H. Bohlin, F-E Brack, M. Cervenak, T. Chodukowski, J. Cikhardt, J. Dostal, R. Dudzak, J. Hubner, W. Huo, S. Jelinek, D. Klir, F. Kroll, M. Krupka, M. Krus, T. Pisarczyk, Z. Rusiniak, U. Schramm, T-H Nguyen-Bui, S. Weber, A. Zaras-Szydlowska, K. Zeil, D. Kumar, T. Schlegel, V Tikhonchuk
Summary: The influence of a transverse magnetic field on the formation and evolution of supersonic plasma jets and shocks was experimentally studied and compared with 3D numerical simulations. The magnetic field was found to improve jet collimation by restricting radial expansion of the plasma, as well as affecting shock structures through modified jet geometry and field line compression in the shock region. The interaction characteristics depended on the relative contribution of magnetic and plasma pressure in balancing the ram pressure of the jet.
PLASMA PHYSICS AND CONTROLLED FUSION
(2022)
Article
Physics, Multidisciplinary
Qiang Chen, Dominika Maslarova, Junzhi Wang, Shao Xian Lee, Vojtech Horny, Donald Umstadter
Summary: This study presents the first experiment of transverse laser interference for electron injection into laser plasma accelerators. Simulation results show that this injection method, different from previous methods, traps electrons into later acceleration buckets. With optimal plasma tapering, the dephasing limit of these unprecedented electron beams could be potentially increased. The simulations and experiments confirm the acceleration of spatially dual electron beams induced by the interference.
PHYSICAL REVIEW LETTERS
(2022)
Article
Physics, Fluids & Plasmas
V Khudiakov, A. Pukhov
Summary: This research presents an electron injection scheme for plasma wakefield acceleration, which utilizes fast electron generation via laser-solid interaction and trapping by a quasilinear wakefield. The study demonstrates the capability of producing high-quality electron bunches and accelerating them to high energies.
Article
Engineering, Electrical & Electronic
V. A. Flegentov, K. Safronov, S. A. Gorokhov, A. S. Tishchenko, S. F. Kovaleva, A. Potapov, A. Pavlenko
Summary: Experimental generation of relativistic electron beams in helium gas jets using a femtosecond Ti:sapphire laser was successful, with resulting X-rays measured at an emitting region size of about 650 micrometers. The experiments also recorded electron beams with significant characteristics such as a total charge of 0.2 - 0.5 nC, a maximum electron energy of up to 60 MeV, and a divergence of up to 300 mrad.
QUANTUM ELECTRONICS
(2021)
Article
Physics, Fluids & Plasmas
A. Biagioni, M. P. Anania, S. Arjmand, E. Behar, G. Costa, A. Del Dotto, M. Ferrario, M. Galletti, V Lollo, D. Pellegrini, G. Di Pirro, R. Pompili, Y. Raz, G. Russo, A. Zigler
Summary: The development of compact accelerator machines is moving towards plasma-based devices capable of high acceleration gradients. A gas-filled discharge-capillary stabilized by external laser pulse ignition shows noticeable improvements in plasma density stability, allowing for the development of longer capillaries and required acceleration lengths.
PLASMA PHYSICS AND CONTROLLED FUSION
(2021)
Article
Nanoscience & Nanotechnology
Tong Ye, Leichao Yang, Bin An, Jianfeng Zhang, Meng Ding
Summary: Compared with single-point laser-induced plasma, multi-point laser-induced plasma has advantages in ignition and flameholding, but there is little research in this area. This study conducted numerical simulations of multi-point laser-induced plasma in supersonic flow and analyzed the evolution of the velocity field, streamline, and plasma kernel position in the flow field. The results showed that the distance between adjacent focal spots is the main factor influencing the evolution.
Article
Physics, Applied
Y. Sakai, O. B. Williams, A. Fukasawa, A. Murokh, R. Kupfer, K. Kusche, M. Fedurin, I. Pogorelsky, M. Polyanskiy, M. Babzien, M. Palmer, J. B. Rosenzweig
Summary: A timing method that uses a semiconductor plasma switch is validated through an experiment on the interaction of a near-infrared laser and an ultra-relativistic electron beam. A thin Si plate is excited to generate a semiconductor plasma, which deflects counter-colliding laser light. The experiment demonstrates inverse Compton scattering using a counter-colliding electron beam and an Nd: YAG laser.
JOURNAL OF APPLIED PHYSICS
(2023)
Article
Chemistry, Analytical
Garima Arora, Jinto Thomas, H. C. Joshi
Summary: This article reports on the rather long time emission (approximately 250 microseconds) from aluminum neutrals (Al I) in a ns laser-produced plasma in the presence of ambient argon. The study investigates the effects of laser power density, background pressure, and distance from the target. In addition to the previously observed slow and fast peak components in the emission spectra, a very long delayed emission is also observed for the first time, which is found to depend on various factors including laser power density, distance from the target, ambient gas, and pressure. The emission is only observed from Al neutrals and is most likely the result of excitation and subsequent emission from Al neutrals due to energy transfer from metastables of the ambient gas.
JOURNAL OF ANALYTICAL ATOMIC SPECTROMETRY
(2022)
Article
Physics, Multidisciplinary
Qiushi Liu, Mingjiang Ma, Xiaohua Zhang, Chong Lv, Jianmin Song, Zhao Wang, Guoqing Yang, Yanlei Yang, Jiahao Wang, Qinxiang Li, Baozhen Zhao
Summary: Gas targets, especially supersonic gas targets, play a significant role in laser-matter interaction, particularly in laser wakefield acceleration (LWFA) experiments. This study focused on the temporal-spatial resolution study of supersonic gas jet targets to provide valuable data for LWFA experiments. By studying the formation process of supersonic gas jets under various conditions, it is possible to determine the optimal time and position for laser injection into the target, leading to improved quality of the obtained electron beam and radiation source.
FRONTIERS IN PHYSICS
(2023)
