A 4 MeV electron RF linear accelerator (RF linac) at the Plasma and Beam Physics Research Facility, Chiang Mai University, is used to irradiate electron beam on the natural rubber latex for vulcanization process. The irradiation area and uniformity of electron dose have significantly influence on the vulcanization quality and throughput. This research focuses on design of electron beam...
Ba$_{1-x}$Mn$_x$TiO$_3$ (BMT), BaTi$_{1-x}$Mn$_x$O$_3$ (BTM), Ba$_{1-x}$Co$_x$TiO$_3$ (BCT) and BaTi$_{1-x}$Co$_x$O$_3$ (BTC) thin films with concentrations $x$ = 0.02, 0.04, 0.08, 0.12, 0.16, and 0.20 were synthesized by sol-gel spin coating method on silicon substrates. The crystal structures were studied by XRD, and the magnetic properties were investigated by VSM. Tetragonal structure was...
Beside the natural phase, LiGaO$_2$ under different pressure conditions can be stable in different structures [http://dx.doi.org/10.1016/j.ceramint.2017.05.247]. The structures of LiGaO$_2$ were named WZ’, HX’, BCT’, RS’ and RS’’ in analogous with the well-known phases of ZnO. In this work, the electronic band structures of those phases were studied. We found that the bandgap as well as the...
Wide-band-gap semiconductors such as III-N have been used as innovation components of solid state lighting devices. For instance, AlN is used to make ultraviolet LEDs [Nature 441, 325 (2006)] and GaN is used to make blue LEDs [J. Appl. Phys. 94, 3675 (2004)]. The alternative wide-band-gap semiconductors are crucial to search for other applications. The mixing of group-III elements in binary...
According to the third-generation of photovoltaic cell, the methylammonium lead iodide perovskite (MAPbI$_3$) has recently gained a great deal of interest. This is as, to date, the solar cell made of this material has been able to reach efficiencies 22.7% in 2017 and is very cost efficient to manufacture compared with that from the conventional silicon based. Such great efficiencies is...
Natural rubber vulcanization using electron beam is one of interesting applications of electron linear accelerators with an energy in a range of a few hundred keV to a few MeV. At the Plasma and Beam Physics Research Facility, Chiang Mai University, a 4-MeV RF linear accelerator (linac) is developed for utilizing in natural rubber vulcanization. To accelerate the vulcanization process,...
This research focuses on computer modeling and magnetic field simulations of a permanent undulator magnet at the Plasma and Beam Physics Research Facility, Chiang Mai University. This undulator magnet will be used for generation of the mid infrared free electron laser (MIR-FEL). It has 40 periods with a period length of 40 mm. The magnetic field can be varied by adjusting a gap of the...
In the recent work, we have demonstrated the high-pressure phase transitions of a heavy element thallium (Tl). The known first phase transition from h.c.p. to f.c.c. is initially investigated by various relativistic levels and exchange-correlation functionals as implemented in FPLO method, as well as scalar relativistic scheme within PAW formalism. The electronic structure calculations are...
Hydrogen storage technology has attracted a worldwide interest for enhancing the efficiency of hydrogen energy carrier used in a clean energy innovation mobile car. In this work, ab initio study of hydrogen storage mechanisms in Magnesium hydride (MgH2) with doping transition metals (TM) was analyzed. High-pressure and structural effects on the doped MgH2 were examined. The conventional cells...
The natural rubber research is ongoing project at the Plasma and Beam Physics Research Facility, Chiang Mai University, Thailand. The project aims to use electron beam irradiation for high quality vulcanization process for natural rubber. The main accelerator system consists of a DC thermionic electron gun, 5-cell linear accelerator structure, control system, RF system and electron beam...
Using the modified Slonczewski model, we studied the relation between the maximum change in magnetoresistance in an applied field and the thickness of the insulating layer in a ferromagnet/insulator/ferromagnet junction. We found that the maximum change in magnetoresistance varies linearly with the width of the insulating layer. We also found that in the high barrier case, the saturation...
A dipole magnet is one of the important components in particle accelerator systems. It can be used to transport a charged particle beam with desired deflecting angle and direction. Moreover, it is often utilized as a part of an energy spectrometer. This research focuses on simulation and measurement of the dipole magnet, which will be used to measure the electron beam energy produced from the...
This experimental work focuses on the investigation of aqueous solutions of copper(II) chloride mixed with glycine. Structural changes of the mixture are probed by X-ray absorption near-edge spectroscopy (XANES) by varying the Cu(II):Gly molar ratios. Moreover, pH is an important parameter to adjust since it influences the formation of the different species present in the Cu(II):Gly solution,...
This research aims to investigate the characteristics of the resonant cavity, which is a part of the radio-frequency (RF) power system of the electron linear accelerator (linac) at the at the PBP-CMU Linac Laboratory, Chiang Mai University. A resonant cavity is used to create RF waves of the desired frequency by exploiting the relation between the cavity dimension and the resonant frequency....
Vulcanization with electron beam irradiation provides unique and high efficient processing for natural rubber latex. It is one of very interesting and effective industrial applications of particle accelerators. A 4-MeV RF linear accelerator and electron beam irradiation system have been developed for natural rubber vulcanization at the Plasma and Beam Physics Research Facility, Chiang Mai...
Quadrupole magnets are normally used for transverse beam size control in particle accelerators. They have magnetic field properties that can focus or defocus the charged particle beam. To build an ideal quadrupole magnet is difficult because four pole faces must have hyperbolic shape. In this work, we studied tangential shimming of a pole face and simulated the magnetic field for designing a...
