Fusion reactions fuse light nuclei to form a heavier nucleus and release a huge amount of energy. In tokamaks and stellarators, this starts by heating magnetically-confined plasma until the light nuclei could overcome a Coulomb barrier and reach fusion conditions. Neutrons, one of the two products of the fusion reactions, are then captured with its kinetic energy converted to electricity...
Fueling in tokamaks is important for plasma confinement and operation. It can be realized by three main methods: gas puff, pellet injection, and supersonic molecular beam injection (SMBI). The SMBI can deliver the fuel more effective than the gas puff, and Thailand Tokamak 1 which is under development may potentially employed this fueling technique. In this work, we develop a simulation for...
Thailand Tokamak-1 (TT-1) will be the first tokamak setting up at Thailand Institute of Nuclear Technology (TINT) in Nakorn Nayok province, Thailand. In the initial operation phase, the hydrogen plasma will be performed with Ohmic heating. In the future, the neutral beam injection (NBI) will be used as the auxiliary heating to achieve the high-performance plasmas. The goal of this study is to...
The 3D range-modulator is an innovation used in particle delivery systems that can create a highly conformal and homogeneous dose distribution in the target volume with mono-energetic beam, providing an option for high dose rate FLASH therapy (exploiting the Bragg peak) [1,2].
In the normal case, the modulators are positioned far away from the target in order to avoid the fluence...
This work study the effects of magnetic field topology of polywell fusion device on electron confinement time. Several polywell designs are used including a cube configuration (6 coils), dodecahedron configuration (12 coils), double-layer configuration (14 coils) and disco configuration (26 coils). The results of magnetic field structure are investigated by using numerical simulations based...
The heat and particle transport equations are used to study the formation of an edge transport barrier (ETB) in a tokamak plasma based on the two-field bifurcation concept. These equations are simultaneously solved by a numerical method using the BOUT++ physics framework resulting in plasma pressure and density profiles as a function of time and plasma radius. The transport effects include...
This work studies the phenomenon of neutron transport simulation and the ratio between incident neutrons and produced tritium breeding of fusion blanket on various materials. The aim is to investigate the local Tritium Breeding Ratio (TBR) after neutrons pass through 5 meters thickness of the 30 degrees angle of cylindrical-shape breeding blanket of different materials using GEANT4 simulation...
High-density linear plasma devices can produce plasmas similar to that of the Tokamaks[1,2]. But, they are simple and compact than the tokamaks. The linear devices are much more cost-effective than the tokamaks for research on plasma material interactions.
In this research, a linear helicon plasma device with permanent magnets was fabricated. A half-turn helical antenna and 13.56 MHz RF were...
Two types of dipole magnets are designed for the storage ring of Siam Photon Source II, the second synchrotron light source in Thailand. Magnetic field at the magnet center is 0.87 T, which bends a 3.0 GeV electron beam with the bending radius of 11.532 m and consequently the synchrotron radiation is generated. The first type of dipole magnet is a standard dipole with the magnet gap of 36 mm....
In our previous experiments, biological samples of naked DNA were bombarded by decelerated low energy ion beams (< 100 eV). The results found that the DNA could be damaged to induce single strand breaks (SSBs) and double strand breaks (DSBs). However, mechanisms of the low energy ion beam interaction with biological samples are unclear yet, particularly on the hot spot issue, namely what and...
The small amounts of natural and anthropogenic radionuclides that accumulate in some human staple diets can cause harm to the health of consumers. In order to examine the level of radioactive background in staple food of Thai people, specific activity of natural (40K, 226Ra and 232Th) and anthropogenic (137Cs) radionuclides were studied and evaluated in 28 samples of organic Sungyod rice...
ALICE (A Large Ion Collider Experiment) is one of the CERN experiments along LHC that studies quark-gluon plasma, a state of matter thought to have formed shortly after the big bang. By 2021, a plan to upgrade the ALICE Inner Tracking System has been proposed and the Monolithic Active Pixel Sensor, a novel silicon sensor technology, will be employed. The ALICE PIxel DEtector is the name of the...
Neutron shielding materials were fabricated based on natural rubber (NR) and boron carbide (B4C) as their main components. Natural rubber, which contains a lot of hydrogen, can lower the energy of a neutron. Boron carbide, which contains a lot of boron, may absorb neutrons. The shielding materials were created with boron carbide concentrations of 0, 20, 40, and 60 parts per hundred rubber...
Siam Photon Source II (SPS-II) will be the first and only 4th generation synchrotron light source in South-East Asia region upon its completion. The accelerator complex consists of a 150 MeV linac and 3 GeV booster synchrotron combination acting as an injector, and a 3 GeV electron storage ring based on a modified 6 Bend Achromat (6BA) lattice. The modified 6BA, or Double Triple Bend Achromat...
Since discovering of radioisotope materials, scientists and engineers tried to apply them into many ways to take the advantage from its penetration characteristic. This paper aims to introduce its usefulness as an important tool for process investigation in petroleum and petrochemical plants. Mostly, petroleum and petrochemical plants are continuously operating for more than three years per...
The mechanism behind the biological sparing effect with ultra-high dose rate (FLASH) still remains unknown. One possibility is that the FLASH effect is caused by oxygen removal or the reaction of radiation-induced radicals with oxygen during irradiation. In this work, before studying the oxygen removal with FLASH irradiation, we decide to irradiate the samples with conventional dose rate...
The ELM phenomenon in fusion plasma is studied based on bifurcation concept. Three field transport equations including thermal, particle and toroidal momentum transports are solved simultaneously, resulting in the spatio-temporal prediction of plasma pressure, density, and toroidal momentum profiles. The transports include both neoclassical and anomalous effects with the velocity shear...
Boron neutron capture therapy (BNCT) is a type of radiation therapy that utilizes the interaction of a stable boron ($^{10}B$) isotope and a thermal neutron to generate high-LET alpha and $^7Li$ particles that disrupt tumor cell DNA. Due to the low penetrating properties of alpha, the interaction is confined within cancer cells, and normal tissues are spared. BNCT has been demonstrated to be...
The beam diagnostics to monitor the source performance constitutes an important part of particle accelerator. One of the key beam diagnostics is the charged particle beam current, the Faraday cup. This paper focuses on the design of Faraday cup for an electron beam energy between 5-50 MeV. For a good performance, the well-proved Monte Carlo codes of the PHITS has been performed to select the...
The Siam Photon Source (SPS) in Thailand has been in operation for synchrotron radiation users since 2003. Since the light obtained from the synchrotron light source is the high-intensity radiation in the range from the infrared to high-energy X-rays, it has great attention in many areas of scientific research and industrial development. However, a wide variety of applications covering...
Treatment on fresh fruits, meet and food with ionizing radiation has been frequently chosen to destroy harmful pathogenic microorganism and oriental fruit flies. Electron beam linear accelerator (Linac) is commonly used as the source of irradiation to produce photon and electron in megavolt energy. A 6 MeV Linac designed for medical therapy has been developed for fresh fruit sterilization at...
