Papers by vincent bagnoud
Physics of Plasmas, 2020
The Facility for Antiproton and Ion Research (FAIR) will employ the World's highest intensity... more The Facility for Antiproton and Ion Research (FAIR) will employ the World's highest intensity relativistic beams of heavy nuclei to uniquely create and investigate macroscopic (millimeter-sized) quantities of highly energetic and dense states of matter. Four principal themes of research have been identified: properties of materials driven to extreme conditions of pressure and temperature, shocked matter and material equation of state, basic properties of strongly coupled plasma and warm dense matter, and nuclear photonics with a focus on the excitation of nuclear processes in plasmas, laser-driven particle acceleration, and neutron production. The research program, principally driven by an international collaboration of scientists, called the HED@FAIR collaboration, will evolve over the next decade as the FAIR project completes and experimental capabilities develop. The first programmatic research element, called “FAIR Phase 0, officially began in 2018 to test components, detect...
Journal of the Optical Society of America B, 1999
We use a spectral interferometric method to characterize a 150-nm-bandwidth stretcher. We analyze... more We use a spectral interferometric method to characterize a 150-nm-bandwidth stretcher. We analyze the phase distortion that is due to the system and show the influence of the quality of the mirrors on the pulse duration.
Journal of the Optical Society of America A, 1999
ABSTRACT We present a solution based on the Rayleigh hypothesis. The calculation leads to a matri... more ABSTRACT We present a solution based on the Rayleigh hypothesis. The calculation leads to a matrix system that can be computed to yield the efficiencies of a two-dimensional dielectric grating. The results are compared with previously reported numerical results obtained both with exact theories and with perturbation methods. We show that our method can treat rougher surfaces than can classic perturbation methods.
Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 2014
The generation of intense ion beams from high-intensity laser-generated plasmas has been the focu... more The generation of intense ion beams from high-intensity laser-generated plasmas has been the focus of research for the last decade. In the LIGHT collaboration the expertise of heavy ion accelerator scientists and laser and plasma physicists has been combined to investigate the prospect of merging these ion beams with conventional accelerator technology and exploring the possibilities of future applications. We report about the goals and first results of the LIGHT collaboration to generate, handle and transport laser driven ion beams. This effort constitutes an important step in research for next generation accelerator technologies.
Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 2011
LASERIX is a high-power laser facility leading to High-repetition-rate XUV laser pumped by Titani... more LASERIX is a high-power laser facility leading to High-repetition-rate XUV laser pumped by Titanium:Sapphire laser. The aim of this laser facility is to offer Soft XRLs in the 30–7nm range and auxiliary IR beam, which could also be used to produce synchronized XUV sources. In this contribution, the main results concerning both the development of XUV sources and their use
Nature Physics, 2010
Continuing professional development is the process of life-long learning in practice. It helps th... more Continuing professional development is the process of life-long learning in practice. It helps the medical professionals to keep them up-to-date to meet the needs of the patient and health care services and to improve their knowledge, skill and attitude. Enam Medical College arranges CPD program regularly. From July 2011 to December 2011, total 22 seminars were held. Around 350 students, doctors and teachers attended each of these seminars.
Laser and Particle Beams, 2003
The high precision X-ray spectroscopy studies of plasma created from the CO2 clusters in gas jet ... more The high precision X-ray spectroscopy studies of plasma created from the CO2 clusters in gas jet targets by the ultrashort laser pulses (35 and 60 fs duration) were performed at the intensities IL ∼ 1017–1018 W cm−2. The spectral line shape of the H-like and He-like oxygen ions gains an asymmetry with increasing the laser pulse intensity. Theoretical modeling of the line shape shows that the asymmetry can be explained by absorption of the Doppler-shifted line radiation from the essential fraction of ions (over 10−3) with energies above 1 MeV due to photoionization of inner shells of carbon ions. The results obtained demonstrate measurement capabilities of the X-ray spectral measurements of multicharged ions accelerated during the interaction with a laser radiation.
Journal of Physics: Conference Series, 2010
A pulsed high field solenoid was used in a laser-proton acceleration experiment to collimate and ... more A pulsed high field solenoid was used in a laser-proton acceleration experiment to collimate and transport the proton beam that was generated at the irradiation of a flat foil by a high intensity laser pulse. 1012 particles at an energy of 2.3 MeV could be caught and transported over a distance of more than 240 mm. Strong space charge effects occur, induced by the high field of the solenoid that forces all co-moving electrons down the the solenoid's axis, building up a strong negative space charge that interacts with the proton beam. This leads to an aggregation of the proton beam around the solenoid's axis and therefore to a stronger focusing effect. The collimation and transport of laser-accelerated protons is the first step to provide these unique beams for further applications like post-acceleration by conventional accelerator structures.
Journal of Physics: Conference Series, 2014
Content from this work may be used under the terms of the Creative Commons Attribution 3.0 licenc... more Content from this work may be used under the terms of the Creative Commons Attribution 3.0 licence. Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI.
Journal of Physics: Conference Series, 2014
Journal of Physics: Conference Series, 2009
The PHELIX facility is available to users since 2008. Nanosecond pulses up to 500 J are utilized ... more The PHELIX facility is available to users since 2008. Nanosecond pulses up to 500 J are utilized at present for experiments combining the heavy ions accelerated at the GSI LINAC facility, while sub-picosecond 200-TW pulses are used in laser stand-alone experiments. A review of the laser performance and future developments is shown.
Hyperfine Interactions, 2010
Proposed as satellite-based weapons during the 1980s, X-ray lasing was for a long time only achie... more Proposed as satellite-based weapons during the 1980s, X-ray lasing was for a long time only achieved with enormous amounts of pump energy in either nuclear explosions or at kilojoule-class laser installations. During the last few years a tremendous development was achieved, most visible in the realisation of the FEL lasers at DESY and SLAC. As important for a wider applicability is the enormous reduction in pump energy for laser pumped plasma X-ray lasers, which now brings such devices into the range of applications for diagnostics and spectroscopy even in smaller laboratories. Main developments were the transient excitation scheme and the optimized pumping concepts. This paper concentrates on developments at the GSI Helmholtzcenter at Darmstadt aiming towards reliable X-ray laser sources in the range from 50 to several 100 eV. The main driving forces for the laser development
High Energy Density Physics, 2012
We present measurements of the changes in the microscopic structure of graphite in a laser-driven... more We present measurements of the changes in the microscopic structure of graphite in a laser-driven shock experiment with X-ray scattering. Laser radiation with intensities of w2 Â 10 13 W/cm 2 compressed the carbon samples by a factor of two reaching pressures of w90 GPa. Due to the change of the crystalline structure the scattered signals of the probe radiation were modified significantly in intensity and spectral composition compared to the scattering on cold samples. It is shown that the elastic scattering on tightly bound electrons increases strongly due to the phase transition whereas the inelastic scattering on weakly bound electrons remains nearly unchanged for the chosen geometry.
Journal de Physique IV (Proceedings), 2006
• Focal-spot diagnostics (FSD) will be used to determine the irradiance on target. -On-shot measu... more • Focal-spot diagnostics (FSD) will be used to determine the irradiance on target. -On-shot measurements are necessary to account for effects that are present only at full energy. -this is only feasible at high energies by performing calibrated nearfield measurements on a sample beam. • ultrafast temporal diagnostics (utD) will be used to -Set the pulse width safely and effectively and -Measure the on-shot pulse width, shape, and contrast. -An ultrafast streak camera plus an optically based diagnostic are needed to cover the entire pulse-width range (<1 to 100 ps). • these diagnostics, combined with a pulse energy measurement, will determine the on-shot intensity at the focal spot.
Journal de Physique IV (Proceedings), 2006
Journal de Physique IV (Proceedings), 2006
A high-performance optical parametric chirped-pulse amplifier (OPCPA) system has been demonstrate... more A high-performance optical parametric chirped-pulse amplifier (OPCPA) system has been demonstrated as a prototype for the front end of the OMEGA Extended Performance (EP) Laser System.
Applied Physics Letters, 2012
Applied Physics B, 2013
We report on the development of a preamplifier module for temporal contrast enhancement and contr... more We report on the development of a preamplifier module for temporal contrast enhancement and control at petawatt-class lasers. The module is based on an ultrafast optical parametric amplifier (uOPA), which produces temporally clean pulses at the 60 lJ level for seeding a chirped pulse amplification (CPA) system, namely the petawatt facility PHELIX. The amplifier module allows for gain reduction in the following amplifiers, resulting in an attenuation of amplified spontaneous emission (ASE) by more than 4 orders of magnitude. Since the ASE of a CPA system linearly depends on the seeding energy, we were able to demonstrate a continuous variation of the temporal contrast by tuning the gain of the uOPA.
Applied Physics B, 2009
At the Helmholtz center GSI, PHELIX (Petawatt High Energy Laser for heavy Ion eXperiments) has be... more At the Helmholtz center GSI, PHELIX (Petawatt High Energy Laser for heavy Ion eXperiments) has been commissioned for operation in stand-alone mode and, in combination with ions accelerated up to an energy of 13 MeV/u by the heavy ion accelerator UNILAC. The combination of PHELIX with the heavy-ion beams available at GSI enables a large variety of unique experiments. Novel research opportunities are spanning from the study of ionmatter interaction, through challenging new experiments in V. Bagnoud ( ) • A.
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Papers by vincent bagnoud