Atmosphere Optics, Spectroscopy and Lasers Laboratory  LOA-SL

 

 

ENIAN - Enhanced ion acceleration by laser irradiation of special thin polymers layers containing nanoparticles

 

Contracting authority: INSTITUTE OF ATOMIC PHYSICS – IFA , Funding: Ministry of Education and Research , Contract no: FAIR_09 / 24.11.2020 / 2020-2023/ Budget 1.600.000 lei ( ~328.220) euro
Project Manager: Assoc. Prof. PhD. Habil. Silviu-Octavian GURLUI 

 

The goal of the ENIAN project is based on two main directions: a) to study the fundamental aspects that characterize the interaction between the laser beam and polymers targets/ nanoparticle doped polymers via experimental methods and to develop a new theoretical model that describes processes (solid state changes after irradiation, plasma generation and expansion behavior, etc.); b) to improve the properties of the designed targets by means of PLD optical diagnosis, to reduce the contamination of the plasma, to enhanced ion acceleration.   

 

ENIAN project includes one of the highest technology necessary for the doping of thin composite layers (100-1000 nm) with nanoparticles (10-100 nm) in special experimental conditions (using 100 micron thick plastic substrate) that offer a wide range of critical parameters (vacuum, geometry, temperature, optical properties, roughness, thickness, etc.). Using the prototype of the new targets designed in Romania for standard laser target holders (FAIR) and characterize them, PLD composite layers will be both the core of further advanced research on hydrodynamic expansion simulation and to improve the quality of targets for x-ray generation in laser-plasma interactions. Optical and electrical properties of the laser produced plasma and ion acceleration in the both BPA and TNSA regimes depend strongly by the laser parameters (the pulse energy, the laser fluence, the pulse width, the laser repetition rate), the irradiation conditions (size of the focal point, the presence of the pre-pulse) and the target composition and geometry (the target thickness, multilayer’s, nanostructures, etc). In order to increase the laser energy absorption in the thin foils and the transfer of the laser light energy to the plasma, advanced targets will be further developed according needed FAIR infrastructure projects (APPA/MML/Plasma Physics/PHELIX). Furthermore, optimal target thickness and embedded NPs types in the polymer target must be analyzed according to the light absorption coefficient in the wavelength range from UV to near IR. Used embedded metallic NPs and PLD thin layer deposed on the polymers films permit to increase the laser absorbance in thin targets.

 

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To enhance the efficiency of the laser-solid interactions, laser- plasma plume interactions and the atomic emission intensity, Laser Induced Breakdown Spectroscopy (LIBS) dual-pulse will be investigated: ICCD monitoring of the global dynamics of the plasma plume, velocities determination of the structures that form the generated plasma; Time and space resolved optical emission spectroscopy: element identification, determination of the velocities of the generated species, plasma contamination effect under the wall irradiation, resolved space-time excitation temperature and electron density profiles; Electrical characterization of the plasma plume: plasma potential measurements with emissive probes heated by a focused infrared laser beam; Develop a theoretical model to describe the implicated processes in plasma generation and expansion in PLD. 

 

ENIAN project is based on the use of research infrastructures and human resources in Romania and Germany, both experimental resource (FAIR & LOASL) and simulations - hydrodynamic expansion simulation (PIC codes to simulate the interaction/ at FAIR supercomputers) to achieve special goals for the development of FAIR research infrastructure, to improve the needed laser beam transport in vacuum  and for expanding of research and applications in the field of plasma and high energy particles. 

ENIAN is based on two main directions: a) to study the fundamental aspects that characterize the interaction between the high fluency laser ablation and solid state material via experimental methods and to develop a new theoretical model that describes the fundamentals (solid state changes after irradiation, plasma generation and expansion behavior, etc.); b) to improve the properties of the composited targets by means of PLD and space-time resolved transitory laser ablation plasma.

General project objectives: 

To increase the knowledge in an inter-disciplinary, up to date field, promote and characterize new materials; Raise the standards of the inter-disciplinary basic research, through the co-operation of a critical mass of researchers from FAIR and LOA-SL/UAIC and other high education institutes; Efficiently exploit the existing resources of our laboratories; Improve the performances of the research staff at a national/international level, to integrate young researchers/PhD in the project team; Provide a specialization of researchers through training stages, prestigious high education institutes; Increase the visibility at a national and international level, by disseminating the project results to the scientific and economical community, as well as to an extended public; Provide a co-operation and a long-term utilization of the obtained results much beyond the project period. 

 

Specific project objectives

n  Preparation of advanced targets to realize absorption measurements test of ion acceleration, at low energy, of ion yield emission and production of absorbent metallic nanostructures and nanoparticles; 

n  Optical properties characterization of both the bulk targets and nanoparticles coated and embedded on polymers targets; 

n  Study of the double laser pulse interacting under laser fluencies above 1010 W/cm2 with bulk and embedded metallic nanoparticle polymers (EMNP) targets in BPA regime to produce high ion emissions (below 1 MeV) and high current; 

n  Study of the advanced EMNP targets behavior under laser fluencies above 1015 W/cm2 to accelerate TNSA  ions with kinetic energies above 1MeV/charge state; 

n  Study the radiation pressure acceleration (RPA) under laser fluence above 1015 W/cm2 to obtaining very high ion acceleration above 10 MeV/charge state.  

n  Modeling of the laser - EMNP targets interactions  by means COMSOL multyphysics software 

n  Performing PIC codes (using FAIR infrastructure) to investigate the interaction & simulation hydrodynamic expansion  

n  M aking prototype targets on standard laser target holders used at FAIR and characterize them by means: space-time resolved optical emission spectroscopy, UV-VIS/FTIR spectroscopy, XRD, XPS, AFM, scanning electron microscopy SEM/ EDX/EDS  

n  Contributing to improve the vacuum technology for laser beam transport

 

 

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