Conference paper: GEANT4 SIMULATIONS OF PROTON-INDUCED SPALLATION FOR APPLICATIONS IN ADSR SYSTEMS (IPAC 2016)

In order to assess the feasibility of spallation driven fission and transmutation, we have simulated proton induced neutron production using GEANT4, initially benchmark-ing our simulations against published experimental neutron spectra produced from a thick lead target bombarded with 0.5 and 1.5 GeV protons. The Bertini and INCL models available in GEANT4, coupled with the high precision (HP) neutron model, are found to adequately reproduce the published experimental data. Given the confidence in the GEANT4 simulations provided by this benchmarking, we have then proceeded to simulate neutron production as a function of target geometry and thence to some preliminary studies of neutron production in an ADSR with the geometry similar to that of the proposed Belgian MYRRHA project. This paper presents the results of our GEANT4 benchmarking and simulations.

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ipac 16 paper

The optimisation studies for neutron spalllation (presented in IOP Particle Accelerator and Beam group Annual Conference 2015)

Neutron spallation, i.e. the ” chipping off ” of neutrons from a heavy metal target by high energy protons, is a safe, controllable and efficient process for producing an intense flux of neutrons. Indeed the next generation intense neutron facilities for the neutron scattering studies of condensed matter, such as JPARC (Japan), SNS (US) and more recently ESS (Sweden), are all based upon spallation rather than fission. Additionally there is a growing interest in the spallation process in Accelerator Driven Subcritical Reactors (ADSRs) for both energy production and for the transmutation of nuclear waste. To facilitate such studies we have attempted to benchmark GEANT4 against published experimental neutron spectra produced from a thick lead target bombarded with 0.5 and 1.5 GeV protons and the corresponding MCNP4A simulations. We have found that by using the Binary intranuclear cascade(BIC) model available in GEANT4 (version 10.1) coupled with the high precision (HP) neutron model which uses evaluated nuclear data libraries for neutron cross-sections below 20 MeV, one can successfully reproduce the experimental and simulated data published Meigo et.al [1] using the MCNP4A simulation code, thereby giving us the confidence to proceed to more detailed GEANT4 of neutron production and distributions as functions of target geometry. In this poster the results of both our benchmarking and the changes in neutron behaviours on target geometry studies are presented. Abstract • Simulations described in previous sections were performed to compare the results from MCNP-4A and GEANT4 against experimental data. • The results from GEANT4 showed exact matches with MCNP4A and close to the experimental results in terms of the line shape and corresponding neutron energies for each angle

Click below for the poster:

IOP PAB poster 2015

Abstract: Monte-Carlo simulations for spallation and Thorium (presented in school of applied science annual presentation 2014)

Abstract : Since Thorium has widely gained attention around the world, the characteristics of Thorium as a nuclear fuel are in serious need of intensive study. Accelerator Driven Systems (ADS), with a thorium fuel cycle, could provide a way to incinerate heavy actinides safely with low waste and
offers a proliferation-resistant nuclear power technology. In accelerator driven system, the two main envisioned improvements that could be made are the spallation design and the Thorium fuel cycle. In this paper, there are 3 different types of simulation experiments included. For Spallation simulation work (chapter 1), I used Geant4 to simulate spallation interactions with
various energies of proton beams incident on a Lead spallation target. The simulations showed that most of the neutrons were produced at the front surface of the target, where the proton beam entered, and many were scattered through the rear surface of the target. In chapter 2, the radii of the cylinder were varied for identifying the optimal radius of neutron production.The result showed that 16 cm radius of the Thorium cylinder was producing the highest rate of neutron yield at 0.9, 1.0 and 1.1 GeV proton beam energy. The varying radius has also affected the neutron energy spectra. In the final chapter, a cylinder composed of a combination of Thorium-232 and Uranium-235 was placed outside of a Lead spallation target. The composition of Thorium-232 and Uranium-235 was varied with the range between 4% and 20% of Uranium-235.The result showed that the neutron yield gradually increased as the amounts of Uranium-235 increased.
The highest rate of neutron yield was recorded at 80% 232Th and 20% 235U. Taken together, the results will be helpful to newly design the fuel assembly for improving the efficienty in the ADSR core.

Please contact me if you require the full report at sangcheol.lee@hud.ac.uk

Monte-Carlo Simulation for neutron spallation on Lead in 30MeV-1GeV proton beam energies

Monte-Carlo Simulation for neutron spallation on Lead in 30MeV-1GeV proton beam energies

This poster is presented at Institute of Physics Particle Accelerator and Beam Group conference 2014.

Abstract:

Accelerator Driven Systems (ADS), with a thorium fuel cycle, could provide a way to incinerate heavy actinides safely with low waste and offers a proliferation-resistant nuclear power technology.  Substantial research is necessary on spallation targets in order to improve the performance and safety of ADS.

For this work we used GEANT4 to simulate spallation interactions with various energies of proton beams incident on a 30cm long cylindrical Lead target. Detectors were placed around the target to measure the angular and energy distributions of spallation neutrons.
The simulations showed that most of the neutrons are produced at the front surface of the target, where the proton beam entered, and many were scattered through the rear surface of the target.

 

Click here: a0 poster for david lee

Abstract: Neutron Spallation studies on Lead target by using a Monte-Carlo Code (GEANT4)

“A series of proton beams with different beam energy were directed towards a 30cm long cylindrical Lead target. Detectors were placed around the target to measure the number of neutrons and the neutrons’ kinetic energies to identify the angle distributions and energy distributions of spallation neutrons.

GEANT4.9.6 with Binary Internuclear Cascade was used to simulate the neutron spallation. The results of the simulations were compared to experimental values. Influences of different parameter were analysed with the corresponding neutron yield data”

More Info:This is the progression report for the first year of my PhD course. Currently, I am extending this spallation studies by adding Thorium for fission reaction.

Thank you

 

Abstract for GEANT4 spallation studies on Lead spallation target

This is the abstract for a scientific poster that I will post for Institute of Physics Particle Accelerator and Beam Group Annual Conference in 2014 and Research Festival in University of Huddersfield. The poster file will be uploaded soon

Thank you

IOP PAB 14 abstract(newversion)

An article published in Science Times published by HungGeun Kim(The interviewee: David Sangcheol Lee)

A Korean article published that has been published in “Science Times” in South Korea. The article is based on an interview with David Sangcheol Lee and it is written and published by Mr HungGeun Kim, Science Time in Republic of Korea

The article is about Thorium and ADSR

Here is the link: thorium article(토륨기사)

Please have a look 🙂

Thank you