scholarly journals TOMOGRAPHY OF A SEEDED FREE-ELECTRON LASER FOCAL SPOT: QUALITATIVE AND QUANTITATIVE COMPARISON OF TWO RECONSTRUCTION METHODS FOR SPOT SIZE CHARACTERIZATION

2021 ◽  
Author(s):  
Alberto Simoncig ◽  
Michele Manfredda ◽  
Benedikt Rösner ◽  
Nicola Mahne ◽  
Lorenzo Raimondi ◽  
...  
Keyword(s):  
Free Electron ◽  
Free Electron Laser ◽  
Focal Spot ◽  
Spot Size ◽  
Quantitative Comparison ◽  
Qualitative And Quantitative ◽  
Reconstruction Methods ◽  
Size Characterization ◽  
Laser Focal Spot

scholarly journals Dependence of laser accelerated protons on laser energy following the interaction of defocused, intense laser pulses with ultra-thin targets

2011 ◽  
Vol 29 (3) ◽  
pp. 345-351 ◽  
Author(s):  
C.M. Brenner ◽  
J.S. Green ◽  
A.P.L. Robinson ◽  
D.C. Carroll ◽  
B. Dromey ◽  
...  
Keyword(s):  
Laser Pulse ◽  
Focal Spot ◽  
Laser Pulse Energy ◽  
Laser Energy ◽  
Spot Size ◽  
Proton Flux ◽  
Focal Spot Size ◽  
Order Of Magnitude ◽  
Laser Focal Spot ◽  
Accelerated Protons

AbstractThe scaling of the flux and maximum energy of laser-driven sheath-accelerated protons has been investigated as a function of laser pulse energy in the range of 15–380 mJ at intensities of 1016–1018 W/cm2. The pulse duration and target thickness were fixed at 40 fs and 25 nm, respectively, while the laser focal spot size and drive energy were varied. Our results indicate that while the maximum proton energy is dependent on the laser energy and laser spot diameter, the proton flux is primarily related to the laser pulse energy under the conditions studied here. Our measurements show that increasing the laser energy by an order of magnitude results in a more than 500-fold increase in the observed proton flux. Whereas, an order of magnitude increase in the laser intensity generated by decreasing the laser focal spot size, at constant laser energy, gives rise to less than a tenfold increase in observed proton flux.

scholarly journals Bremsstrahlung emission profile from intense laser-solid interactions as a function of laser focal spot size

2019 ◽  
Vol 61 (3) ◽  
pp. 034001 ◽  
Author(s):  
C D Armstrong ◽  
C M Brenner ◽  
E Zemaityte ◽  
G G Scott ◽  
D R Rusby ◽  
...  
Keyword(s):  
Focal Spot ◽  
Spot Size ◽  
Intense Laser ◽  
Focal Spot Size ◽  
Emission Profile ◽  
Bremsstrahlung Emission ◽  
Laser Focal Spot ◽  
Laser Solid Interactions

Optimizing laser focal spot size using self-focusing in a cone-guided fast-ignition ICF target

2021 ◽  
Vol 136 (5) ◽  
Author(s):  
Oriza Kamboj ◽  
Harjit Singh Ghotra ◽  
Vishal Thakur ◽  
John Pasley ◽  
Niti Kant
Keyword(s):  
Focal Spot ◽  
Spot Size ◽  
Fast Ignition ◽  
Focal Spot Size ◽  
Self Focusing ◽  
Laser Focal Spot ◽  
Icf Target

scholarly journals A novel approach in the free-electron laser diagnosis based on a pixelated phosphor detector

2016 ◽  
Vol 23 (1) ◽  
pp. 29-34 ◽  
Author(s):  
Alessia Matruglio ◽  
Simone Dal Zilio ◽  
Rudi Sergo ◽  
Riccardo Mincigrucci ◽  
Cristian Svetina ◽  
...  
Keyword(s):  
High Resolution ◽  
Silicon Substrate ◽  
Free Electron ◽  
Free Electron Laser ◽  
High Performance ◽  
Spot Size ◽  
The Novel ◽  
Etching Technique ◽  
Novel Approach ◽  
Focused Beam

A new high-performance method for the free-electron laser (FEL) focused beam diagnosis has been successfully tested at the FERMI FEL in Trieste, Italy. The novel pixelated phosphor detector (PPD) consists of micrometric pixels produced by classical UV lithography and dry etching technique, fabricated on a silicon substrate, arranged in a hexagonal geometry and filled with suitable phosphors. It has been demonstrated that the overall resolution of the system has increased by reducing the diffusion of the light in the phosphors. Various types of PPD have been produced and tested, demonstrating a high resolution in the beam profile and the ability to measure the actual spot size shot-to-shot with an unprecedented resolution. For these reasons, the proposed detector could become a reference technique in the FEL diagnosis field.

scholarly journals Focal Spot and Wavefront Sensing of an X-Ray Free Electron laser using Ronchi shearing interferometry

2017 ◽  
Vol 7 (1) ◽  
Author(s):  
Bob Nagler ◽  
Andrew Aquila ◽  
Sébastien Boutet ◽  
Eric C. Galtier ◽  
Akel Hashim ◽  
...  
Keyword(s):  
Free Electron ◽  
Free Electron Laser ◽  
Focal Spot ◽  
Wavefront Sensing ◽  
Shearing Interferometry ◽  
X Ray

scholarly journals Interplay of wavelength, fluence and spot-size in free-electron laser ablation of cornea

2009 ◽  
Vol 17 (12) ◽  
pp. 9840 ◽  
Author(s):  
M. Shane Hutson ◽  
Borislav Ivanov ◽  
Aroshan Jayasinghe ◽  
Gilma Adunas ◽  
Yaowu Xiao ◽  
...  
Keyword(s):  
Laser Ablation ◽  
Free Electron ◽  
Free Electron Laser ◽  
Spot Size

scholarly journals Method based on atomic photoionization for spot-size measurement on focused soft x-ray free-electron laser beams

2006 ◽  
Vol 89 (22) ◽  
pp. 221114 ◽  
Author(s):  
A. A. Sorokin ◽  
A. Gottwald ◽  
A. Hoehl ◽  
U. Kroth ◽  
H. Schöppe ◽  
...  
Keyword(s):  
Free Electron ◽  
Free Electron Laser ◽  
Spot Size ◽  
Laser Beams ◽  
Size Measurement ◽  
X Ray

scholarly journals xcalib: a focal spot calibrator for intense X-ray free-electron laser pulses based on the charge state distributions of light atoms

2019 ◽  
Vol 26 (4) ◽  
pp. 1017-1030 ◽  
Author(s):  
Koudai Toyota ◽  
Zoltan Jurek ◽  
Sang-Kil Son ◽  
Hironobu Fukuzawa ◽  
Kiyoshi Ueda ◽  
...  
Keyword(s):  
Charge State ◽  
Free Electron ◽  
Free Electron Laser ◽  
Focal Spot ◽  
Experimental Results ◽  
Experimental Conditions ◽  
X Ray ◽  
Wide Range ◽  
Light Atoms ◽  
Charge State Distributions

The xcalib toolkit has been developed to calibrate the beam profile of an X-ray free-electron laser (XFEL) at the focal spot based on the experimental charge state distributions (CSDs) of light atoms. Characterization of the fluence distribution at the focal spot is essential to perform the volume integrations of physical quantities for a quantitative comparison between theoretical and experimental results, especially for fluence-dependent quantities. The use of the CSDs of light atoms is advantageous because CSDs directly reflect experimental conditions at the focal spot, and the properties of light atoms have been well established in both theory and experiment. Theoretical CSDs are obtained using xatom, a toolkit to calculate atomic electronic structure and to simulate ionization dynamics of atoms exposed to intense XFEL pulses, which involves highly excited multiple core-hole states. Employing a simple function with a few parameters, the spatial profile of an XFEL beam is determined by minimizing the difference between theoretical and experimental results. The optimization procedure employing the reinforcement learning technique can automatize and organize calibration procedures which, before, had been performed manually. xcalib has high flexibility, simultaneously combining different optimization methods, sets of charge states, and a wide range of parameter space. Hence, in combination with xatom, xcalib serves as a comprehensive tool to calibrate the fluence profile of a tightly focused XFEL beam in the interaction region.

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