M. Martinez
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View article: Technical design report for the CODEX-<i>β</i> demonstrator
Technical design report for the CODEX-<i>β</i> demonstrator Open
The CODEX- β apparatus is a demonstrator for the proposed future CODEX-b experiment, a long-lived-particle detector foreseen for operation at IP8 during HL-LHC data-taking. The demonstrator project, intended to collect data in 2025, is des…
View article: Automatic Optimization of a Parallel-Plate Avalanche Counter with Optical Readout
Automatic Optimization of a Parallel-Plate Avalanche Counter with Optical Readout Open
An automatic optimization procedure is proposed for some operational parameters of a Parallel-Plate Avalanche Counter with Optical Readout, a detector designed for heavy-ion tracking and imaging. Exploiting differentiable programming and a…
View article: The response function of Fujifilm BAS-TR imaging plates to laser-accelerated titanium ions
The response function of Fujifilm BAS-TR imaging plates to laser-accelerated titanium ions Open
Calibrated diagnostics for energetic particle detection allow for the systematic study of charged particle sources. The Fujifilm BAS-TR imaging plate (IP) is a reusable phosphorescent detector for radiation applications such as x-ray and p…
View article: Improved large-energy-range magnetic electron-positron spectrometer for experiments with the Texas Petawatt Laser
Improved large-energy-range magnetic electron-positron spectrometer for experiments with the Texas Petawatt Laser Open
We present the design, construction, and first use of a magnetic electron-positron spectrometer at the Texas Petawatt Laser facility. Here, the Global Spectrometer for Positron and Electron Characterization (GSPEC) is capable of detecting …
View article: High-angle deflection of the energetic electrons by a voluminous magnetic structure in near-normal intense laser-plasma interactions
High-angle deflection of the energetic electrons by a voluminous magnetic structure in near-normal intense laser-plasma interactions Open
The physics governing electron acceleration by a relativistically intense laser is not confined to the critical density surface; it also pervades the subcritical plasma in front of the target. Here particles can gain many times the pondero…
View article: Bright 5 - 85 MeV Compton gamma-ray pulses from GeV laser-plasma accelerator and plasma mirror
Bright 5 - 85 MeV Compton gamma-ray pulses from GeV laser-plasma accelerator and plasma mirror Open
We convert a GeV laser-plasma electron accelerator into a compact femtosecond-pulsed $γ$-ray source by inserting a $100 μ$m-thick glass plate $\sim3$ cm after the accelerator exit. With near-unity reliability, and requiring only crude alig…
View article: Generation of tens-of-MeV photons by compton backscatter from laser-plasma-accelerated GeV electrons
Generation of tens-of-MeV photons by compton backscatter from laser-plasma-accelerated GeV electrons Open
Previous work has demonstrated the use of a plasma mirror (PM), after a laser-plasma accelerator (LPA), for generating Compton γ-rays by retro-reflecting the spent laser pulse into the just-accelerated electrons. Here, we investigate the u…
View article: Proton acceleration by irradiation of isolated spheres with an intense laser pulse
Proton acceleration by irradiation of isolated spheres with an intense laser pulse Open
We report on experiments irradiating isolated plastic spheres with a peak laser intensity of 2-3×10^{20}Wcm^{-2}. With a laser focal spot size of 10 μm full width half maximum (FWHM) the sphere diameter was varied between 520 nm and 19.3 μ…
View article: Improved pulse contrast on the Texas Petawatt Laser
Improved pulse contrast on the Texas Petawatt Laser Open
We have completed a pulse contrast upgrade on the Texas Petawatt Laser. This improvement enables the use of thin and reduced mass targets for ion acceleration, and reduces pre-plasma effects on all experiments. The new design starts with t…
View article: Betatron x-rays from GeV laser-plasma-accelerated electrons
Betatron x-rays from GeV laser-plasma-accelerated electrons Open
X-rays are produced when laser-wakefield accelerated electrons oscillate in the transverse electrostatic field of the accelerating structure. The measured characteristics of these betatron x-rays follow scaling laws relating them to the el…