A compact low-energy and high-intensity x-ray source for radiation biology applications is presented. laser-induced plasma moves inside a 30 kV diode produces beam of 1014 electrons at the anode location. An aluminum foil converts part energy these into photons, which are characterized using filtered imaging plates. The dose that would be deposited by photons in C. elegans larvae calculated fro...

An experiment (E166) at the Stanford Linear Accelerator Center has demonstrated a scheme in which a multi-GeV electron beam passed through a helical undulator to generate multi-MeV, circularly polarized photons which were then converted in a thin target to produce positrons (and electrons) with longitudinal polarization above 80% at 6 MeV. The results are in agreement with GEANT4 simulations th...

The excellent properties of graphene, such as its high thermal conductivity, electrical and electron density, make it an ideal candidate a detector material in high-energy physics applications. In this work, we demonstrate the feasibility multi-layer graphene (MLG) environment. Geant4 software package was used to estimate energy deposited electrons within various thicknesses MLG, ranging from 3...

In this paper, we present a novel implementation of a dose calculation application, based on the GEANT4 Monte Carlo toolkit. Validation studies were performed with an homogeneous water phantom and an Alderson-Rando anthropomorphic phantom both irradiated with high-energy photon beams produced by a clinical linear accelerator. As input, this tool requires computer tomography images for automatic...

Modified structure along latent tracks and track formation process have been investigated in poly (allyl diglycol carbonate), PADC, which is well recognized as a sensitive etched detector. This knowledge essential to develop novel detectors with improved registration property. The structures of protons heavy ions (He, C, Ne, Ar, Fe, Kr Xe) examined by means FT-IR spectrometry, covering the stop...

a simple semi-phenomenological model, which accurately predicts the dependence of thresholdcurrent for temperature of resonant-phonon three well quantum cascade laser based on verticaltransitions is offered. we found that, the longitude optical phonon scattering of thermally excitedelectrons is the most important limiting factor for thermal performance of high frequency thz qcls.in low frequenc...