Felipe Salgado

Felipe Salgado

PostDoc at FSU Jena and Helmholtz-Institute Jena

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Beam Emittance Evaluation Using PP Permalink

GEANT4 code to simulate the emittance experiment at JETi-200 with experimental parameters obtained from measurements using a pepper pot (PP). The hits of the particles (electrons, positrons, and photons) are recorded at screens placed in different positions.

A python3 jupyter notebook is provided for post-processing the data. It relies on the python package uproot. As requirement, please install it for using this file. One can also read the root files in different ways.

CsI stack array - GEANT4 simulation Permalink

GEANT4 code simulates a CsI array and the energy deposited in its pixels by a primary particle and its secondaries.
The geometry is based on the CsI array used in experiments at the Centre for Advanced Laser Applications (CALA). The purpose of this CsI array is to diagnose the spectrum of gamma-rays produced in experiments (gamma spectrometer).

Jetito Permalink

Python package is designed for efficient post-processing of experimental data acquired from experiments at the JETi200 laser system at the Helmholtz Institute Jena (HIJ).

This package encompasses functionality to evaluate crucial electron beam characteristics such as charge, energy spectrum, and divergence for the different setups used at JETi200. Additionally, the package provides capabilities for far-field calculations of laser beams and the determination of geometric beam emittance using the pepper-pot method.

Jetito is highly configurable, enabling its adaptation to a wide variety of experimental setups, beyond the JETi200.

publications

research

Pair-Production in the Non-Perturbative Regime

Quantum Vacuum Research Unit FOR/2783 Permalink
The direct electron-positron pair creation via quantum-vacuum fluctuations is one of the most intriguing physics processes that remain untested under laboratory conditions. By applying a strong electric field above the Schwinger critical limit of 1.3$\times$10$^{18}$ V/m, the virtual pairs from the quantum fluctuations can be turned into observables. However, despite the recent advances in the peak power of high-intensity lasers, the critical limit is still far beyond achievable.

Detector Development

Particle Detectors for SF-QED Experiments
Detecting signatures of strong-field Quantum Electrodynamics (QED) processes represents a significant experimental challenge. This challenge arises from the inherent high background noise levels, primarily generated by x-rays and $\gamma$-photons, prevalent in experiments involving high-energy electron beams. Consequently, detectors used for this type of experiment need to exhibit high sensitivity to single-particle hits while effectively rejecting background noise spanning several orders of magnitude.

Laser-Driven Particle Acceleration

Optimization and characterization of energy, charge, bandwidth of laser-accelerated electron beams (LWFA)
Laser wakefield accelerators (LWFAs) represent an effective alternative to conventional accelerators, primarily to their ability to accelerate electron bunches up to GeV energies within a compact setup spanning just a few centimeters in stark contrast to the several kilometers required for linear accelerators.

Significant progress on LWFA have been made in the recent years. However, achieving beam quality comparable to that of conventional accelerators still necessitates ongoing research into critical parameters, such as beam energy and bandwidth, emittance, and stability.

talks