
Hani H. NegmAssiut University
Hani H. Negm
Ph.D. (Nuclear Physics)
About
64
Publications
12,830
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361
Citations
Introduction
Applied Nuclear & Radiation Physics. Nuclear Security in Homeland Security. Radiation Detection & Measurement, Monte Carlo Particle Transport Simulation (GEANT4)
Additional affiliations
Jouf University
Position
- Ass. Prof.
January 2015 - June 2022
January 2018 - July 2018
Publications
Publications (64)
The dependence of the nuclear resonance fluorescence (NRF) yield on the target thickness was studied.
To this end, an NRF experiment was performed on 238U using a laser Compton back-scattering (LCS)
γ -ray beam at the High Intensity γ -ray Source facility at Duke University. Various thicknesses of depleted
uranium targets were irradiated by an LCS...
An innovative nanocomposite material, denoted as AT40CdXNi60-X, has been developed by incorporating attapulgite (APL) clay with two different nanometal oxides, CdO and NiO, at varying proportions to serve as
promising alternatives for shielding against γ-rays. The composition of the material is represented as 40%APL +
X%(CdO)+(60–X)%(NiO), with X...
Barium titanium borate glasses doped with ytterbium with the chemical composition of B2O3-TiO2-BaO-Yb2O3 are described as shields exhibiting excellent performance for β and γ applications. This study used the Phy-X and XCOM codes and the GEANT4 toolkit to calculate and simulate the gamma attenuation factors in a 0.02-MeV to 15-MeV range. From the l...
The study investigated new nanocomposites’ γ-ray and neutron shielding properties based on raw attapulgite, a clay matrix intercalated with different weight percentages of mixed nano metal oxides CdO and PbO. The various percentages were as follows: (100–2x)% Attapulgite + x%CdO + x%PbO, abbreviated as (AT100–2x CdxPb x ), where x = 5, 10, 15%. The...
In the present investigation, we examined the efficacy of lithium calcium silicate glasses doped with nickel for various radiation shielding applications. Specifically, we estimated the mass attenuation coefficients (μm) for samples with the composition (11.5–x)CaO-23.5Li2O-(x)NiO-65SiO2 (x = 0, 2.87, 5.75, 8.63, 11.5 mol.%) using Monte Carlo simul...
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This study explores the use of a PPy/CuO nanocomposite film for photocatalytic hydrogen production from wastewater, which is a significant avenue for solar energy applications. The photocatalyst is prepared using a simple in-situ polymerization method on a glass substrate, and is found to exhibit high photocatalytic H2 evolution activity without th...
PPy/GO composite materials formed of graphene oxide nanosheets and polypyrrole (PPy) were effectively prepared by polymerization fabrication method for optical energy applications. The measurements of TEM, XRD, SEM, FT-IR, and XPS showed that PPy/GO composites were successfully synthesized. The nanosheets GO were homogeneously joined into PPy as re...
This work highlights testing the polymer nanocomposite for hydrogen gas production from wastewater (sewage water). The in‐situ polymerization technique is used to prepare polypyrrole (PPy) and PPy/NiOx nanocomposite films on a glass substrate. The film's ability to generate hydrogen from sewage water is then evaluated. The XRD and XPS confirmed the...
An artificial neural network (ANN) code is carried out to estimate the radiological concentration of environmental samples, clay, and sand. The ANN modeling has been calibrated and validated with the measuring data acquired from an HPGe detector. Radioactivity was determined using a gamma spectrometric detector (HPGe) for the collection of clay and...
The isotope imaging technique based on Nuclear Resonance Fluorescence and Computed Tomography (NRF-CT) has been studied in experiments at the UVSOR-III facility besides comprehensive simulations. The laser Compton scattering γ-ray beam, whose maximum energy was 5.56 MeV, in UVSOR-III using the natural lead as a tested CT-target is utilized to demon...
Objective:
This study is to validate the utilization of Monte Carlo (MC) simulation to model the head of Primus linear accelerator, thereafter, using it to estimate the energy fluence distribution (EFD), the percentage depth dose (PDD), and beam profiles.
Materials and methods:
The BEAMNRC code that is based on the EGSNRC code has been used for...
Radioactive pollution comes on the top of pollution types that affect human life directly through damaging the human genome or indirectly via his food web. The current study focused on the evaluation of radiation effects of Assiut Thermal Power Plant (ATPP) ashes on two crop plants, potato and squash, in terms of morphological and molecular levels....
Determination of the full-energy peak efficiency of a detection system is significant in the activity calculation of the measured radioactive samples. In this work, we present an experimental method to determine the absolute efficiency calibration of a NaI(Tl) detector, considering that a standard source of interest is unavailable and by using the...
A quarter-wavelength coaxial cavity with a longitudinal radio-frequency power supply was fabricated and tested. The cavity was designed as a pre-buncher for a thermionic triode-type radio-frequency gun of a mid-infrared free electron laser facility. The triode structure was formed to ensure the reduction of the back-bombarding effect, which usually...
Background: The quality assurance of 3D treatment planning system (TPS) will be investigated by different things such as beam configuration, dose calculation and plane evaluation which uses dose volume histogram analyzes. Material and method: the study was performed by XIO TPS (version 4.3.3) available at South Egypt Cancer Institute (SECI). This T...
An active non-destructive detection system for special nuclear materials (SNMs) such as 235U has been developed for container inspection at sea ports. The SNMs can be detected by using nuclear resonance fluorescence (NRF) with a quasimonochromatic gamma-ray beam provided from a laser Compton Scattering (LCS) source. We have studied the optimum geom...
We have been developing an active, non-destructive detection system based on nuclear resonance fluorescence (NRF) for inspecting special nuclear materials (SNMs) such as 235U in a container at a seaport. The study of the NRF yield dependence on the target thickness of SNMs is required to evaluate the performance of the inspection system. To this en...
A non-destructive inspection system for special nuclear materials (SNMs) hidden in a sea cargo has been developed. The system consists of a fast screening system using neutron generated by inertial electrostatic confinement (IEC) device and an isotope identification system using nuclear resonance fluorescence (NRF) measurements with laser Compton b...
Stable electron beam position and energy are crucial for stable operation of Free Electron Laser (FEL) both in single-pass and oscillator configurations. In order to increase stability of FEL output power and wavelength, three feedback control loops based on beam position measurements have been introduced to an S-band linac driving the mid-infrared...
Studies on the Optimum Geometry for a Nuclear Resonance Fluorescence Detection System for Nuclear Security Applications
We have developed a laser Compton scattered (LCS) gamma-ray source based on a 150-MeV racetrack microtron at Japan Atomic Energy Agency. The microtron equipped with a photocathode RF gun accelerates a single bunch of electrons to collide with a laser pulse from a Nd: YAG laser. Such gamma-ray source realizes industrial application of nuclear materi...
The magnetic field of a staggered-array undulator using a bulk high-temperature superconductor is calculated by analytical and numerical methods. Analytical formulas for the undulator field and the solenoid field required to generate the undulator field are derived from a simple two-dimensional model. The analytical calculation shows the degree of...
Active interrogation in U-235 was demonstrated with LaBr3:Ce scintillation detectors using the nuclear resonance fluorescence (NRF) technique. An NRF experiment was performed at the High using Intensity gamma-ray Source (HI gamma S) facility using quasi-monochromatic circularly or linearly polarized gamma-ray beams. Photons scattered at 90 degrees...
Simple, compact, and powerful seeded terahertz-free electron laser (THz-FEL) which consists of a photocathode radio-frequency gun, a focusing solenoid, an undulator and a THz wave parametric generator has been designed. A start-to-end calculation has been performed by using the particle tracking code PARMELA and the FEL gain simulation code GENESIS...
SiC is attractive as a high power nonlinear optical device [1]. For verifying the possibility of a high harmonic generation from a SiC irradiated by MIR-FEL, we observed the emission from a SiC irradiated by MIR-FEL whose center wavelength was 12 μm. Two measurements observing the second harmonic generation (SHG) and high harmonic generation (HHG)...
A LaBr3(Ce) detector array has been constructed for the non-destructive inspection of special nuclear materials (SNMs) using the nuclear resonance fluorescence (NRF) technique. The fundamental performance of the LaBr3(Ce) detector array, the proper data acquisition system and the analysis system are demonstrated. The developed LaBr3(Ce) array is sh...
A vacuum duct was newly designed and manufactured to make the undulator gap narrower in order to increase the KU-FEL performance. The width of the undulator duct is 15 mm, but the minimum undulator gap is limited to 16.5 mm due to the small flexure of the duct. After replacing the old undulator duct whose minimum width was around 19.5 mm with new o...
Mode-selective phonon excitation by a mid-infrared laser (MIR-FEL) is demonstrated via anti-Stokes Raman scattering measurements of 6H-silicon carbide (SiC). Irradiation of SiC with MIR-FEL and a Nd-YAG laser at 14K produced a peak where the Raman shift corresponds to a photon energy of 119 meV (10.4 mu m). This phenomenon is induced by mode-select...
A nuclear resonance fluorescence (NRF) experiment was performed on a U-235 target with quasi-monochromatic gamma-rays at the High Intensity gamma-ray Source (HI gamma S) facility using a 1733 keV resonant energy. A LaBr3(Ce) detector array consisting of eight cylindrical detectors, each with a length of 7.62 cm and a diameter of 3.81 cm, was implem...
A real-time automatic energy calibration (RAEC) algorithm of a LaBr 3:Ce scintillation detector array has been developed. The energy markers for this calibration are the self-activity lines inherently existing inside the LaBr3 crystal. Five energy markers were used in this technique. Two lines are from the radioactive isotope of lanthanum, 138La, a...
Lanthanum halide scintillator LaBr3(Ce) could potentially improve the performance of spectroscopic systems because of their fine energy resolution in comparison with traditional scintillator materials and a good linearity of the energy response. Monte Carlo simulation of a detector response function presents a very challenging problem especially in...
A nuclear resonance fluorescence (NRF) experiment was performed on a 235U target with the quasi-monochromatic γ-ray at High Intensity γ-ray Source (HIγS) using the 1733 keV resonant energy. A LaBr3(Ce) detector array consisting of 8 cylindrical detectors, each has length of 7.62 cm and a diameter of 3.81 cm, in diameter was implemented in this meas...
A monochromatic gamma ray beam is attractive for isotope-specific material/medical imaging or non-destructive inspection. A laser Compton scattering (LCS) gamma ray source which is based on the backward Compton scattering of laser light on high-energy electrons can generate energy variable quasi-monochromatic gamma ray. Due to the principle of the...
To realize a short-period strong-field undulator, we proposed a high temperature superconducting bulk staggered array undulator (Bulk HTSC SAU) and proceeded proof of principle experiments and numerical studies. We have succeeded to generate periodic transverse magnetic fields whose strength was controlled by an external solenoid field. At the same...
The possibility of the post-manufacturing control of the macroscopic critical current density by the low-fluence high-energy proton irradiation was studied for cm sized bulk high temperature superconductor. The irradiations of 200 MeV protons on bulk DyBaCuO samples with the fluence of from 2.3 × 1010 to 1.2 × 1012 protons/cm2 were performed. The m...
In this paper we present the results for cold test of a coaxial cavity, which is to be installed in an existing RF gun to consist what we call-triode type RF gun. The triode type RF gun is supposed to drastically reduce the back-bombardment of electrons inherent in conventional thermionic RF guns. The coaxial cavity design was done based on tests o...
The feedback system has been developed in KU-FEL linac to stabilize the FEL power fluctuation. The system consists of six 4-button type BPMs and the signal processing system. As the first step, the beam displacement information at the RF-gun section was used for the feedback control to stabilize the electron energy and the vertical beam position at...
LaBr3:Ce scintillating detectors exhibit excellent properties for γ-ray spectroscopy such as high energy resolution and operation under room temperature as well as MHz counting rates. On the other hand, sever background radiations exist due to the internal contamination of radioactive materials that are very difficult to be avoided during the manuf...
A mid-infrared free electron laser (MIR-FEL) (target wavelength: 5 ~ 20 μm) facility named KU-FEL (Kyoto University Free Electron Laser) was constructed to aid various energy science researches at the Institute of Advanced Energy, Kyoto University. In December 2011, KU-FEL was upgraded by replacing its undulator and optical cavity mirrors. By this...
The optimum geometric configuration of the detector system for non-destructive assay (NDA) of special nuclear material (SNM) by using nuclear resonance fluorescence (NRF) measurements has been studied. A Monte Carlo radiation transport code, GEANT4, has been developed to calculate NRF interaction, as well the simulation performed for detector array...
A stable electron beam is essential for a stable FEL operation. In Kyoto University MIR-FEL facility (KU-FEL), a Beam Position Monitor (BPM) system consisting of six 4-button electrode type BPMs and signal processing unit was installed for monitoring of the electron beam position. Fluctuations of the electron beam position have been observed both i...
An investigation of angular distribution of scattered gamma-rays is important to get information about an efficient arrangement of γ-ray detectors and it is necessary to design a real detection system of the inspection system by using a (γ, γ) interaction. Angular distribution of scattered gamma radiation from 11B at 4,440 keV from transition J
π
(...
A study of a non-destructive inspection system for hidden special nuclear materials in the cargo container at the sea port has been carried out under a promotion of Japan Science and Technology. This inspection system consists of an active neutron detection method for a fast screening purpose and a nuclear resonance fluorescence (NRF) method for is...
Excitations in 235U were measured with LaBr3:Ce scintillation detectors using the nuclear resonance fluorescence (NRF) technique. A NRF experiment was performed at the High Intensity y-ray Source (HIyS) facility using quasi-monochromatic circularly or linearly polarized y-ray beams. Photons scattered at 90· relative to the incident beam were detect...
A Mid-Infrared Free Electron Laser (MIR-FEL) facility named as KU-FEL has been constructed for energy science in Institute of Advanced Energy, Kyoto University. The accelerator of KU-FEL consists of an S-band 4.5-cell thermionic RF gun, a Dog-leg section for energy filtering, a 3-m traveling-wave type accelerator tube, 180-degree arc section for bu...
Start-to-end calculation has been performed to estimate the performance of the THz FEL system using a photocathode RF gun which will be installed to existing MIR-FEL (KU-FEL) system at Institute of Advanced Energy, Kyoto University. The aim of this system is a test bench to realize the table-top THz system. The electron beam properties have been ev...
We have been developing mid-infrared FEL (MIR-FEL) system, KU-FEL (Kyoto University-FEL), which utilizes a 4.5 cell S-band thermionic RF gun, in Institute of Advanced Energy, Kyoto University. We plan to introduce a BNL-type 1.6-cell photocathode RF gun to generate higher peak power MIR-FEL. The purpose of this work is to develop the multi-bunch la...
An upgrade project of the MIR-FEL facility developed in the Institute of Advanced Energy, Kyoto University has been in progress since 2010. The project consists of two topics; one is replacement of undulator and the other is replacement of the optical cavity mirrors. Those replacements were accomplished in January 2012. After the upgrade, we have s...
A prototype of coaxial rf cavity for thermionic triode rf gun has been fabricated and tested at low power. The low power test reveals the dependency of cavity resonance frequency on cavity and cathode temperature. Another critical point for resonance frequency is the cavity length. Inaccuracies in machining or simulation of cavity length cause erro...
We have designed a relatively simple, compact and powerful THz-FEL (terahertz free electron laser) amplifier in Kyoto University. The target wavelength range of the amplifier is 150-340 μm, corresponding to 0.5-1.1 THz. The system consists of 1.6 cell photocathode radio frequency (RF) gun, THz wave parametric generator, focusing solenoid, transport...
The knowledge on radioactivity content of the various radionuclides in the soil and rocks play an important role in health physics. The main aim of this work is to estimate the concentrations of natural radionuclides 226 Ra, 228 Ra, 228 Th, 232 Th and 40 k in soil and phosphate samples and, impact of the El-Sabaea phosphate factory on the human hea...
A Mid-infrared Free Electron Laser (MIR-FEL) facility for energy sciences has been developed in Institute of Advanced Energy, Kyoto University. The FEL consists of a 4.5-cell thermionic RF gun, an S-band accelerator tube, an undulator and an optical cavity. The tunable range of the FEL is extended from 10-13 µm to 5-14.5 µm after replacing its undu...