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100 MeV, 20 mA Proton Linear Accelerator
Analytical Service Last update : 2017.08.17 Request for use
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Location
181 Mirae-ro, Geoncheon-eup, Gyeongju-si, Gyeongbuk
Homepage
www.komac.re.kr
Coordinating Country
KOREA
Hosting Organisations
Korea Atomic Energy Research Institute(KAERI)
Contact Person
Jung, Myung-Hwan,+82-54-750-5305,jslee8@kaeri.re.kr
Lee, Chan Young,+82-54-750-5303,chlee@kaeri.re.kr
Suk, Jae Kwon,+82-54-750-5307,jksuk@kaeri.re.kr
RI Category
High Energy Physics Facilities
Keywords
accelerator,ion beam,proton,neutron,isotopes
Description
- KOMAC(Korea Multi-puropose Accelerator Complex) as a branch institute of KAERI (Korea Atomic Energy Research Institute), is a national research facility which operates a 100 MeV high-power proton accelerator and low-energy ion beam facilities to offer an optimum proton beam and various ion beam services, essential in various R&D fields
Application Area
- Researches on nuclear technology, nano technology, biotechnology, information technology, energy and environment technology, space technology, medical applications and basic science
- Development of nano technology, such as ion-cut, thin layer fabrication, nano-particle synthesis, nano-logic device fabrication
- Development of biotechnology in varieties of new genetic resources, radio-biological effects
- Development of information technology in high speed power semiconductor, micro & nano patterning
- Development of energy and environment technology such as renewable green energy resources, biomass preprocessing, micro-organisms for bio-energy
- Development of space technology in radiation hardness test of space devices, space radiation test facility, biological effect study of space radiation
- Development of medical application, such as cancer therapy, medical radioisotopes production & utilization, membrane fabrication technology
- Research on surface modification of metal compounds, functional polymer film fabrication technology, luminescence & anti-UV enhancement technology of automobile interior component, gemstone coloring technology, super-hydrophilic treatment of metal surface, ion beam sputtering deposition technology
Service
Specifications
1. Proton accelerator
- 20 MeV beamline (TR23)
· Beam energy: 3~20 MeV
· Maximum average beam current: 600 μA
· Maximum irradiation diameter: 30 cm
- 100 MeV beamline (TR103)
· Beam energy: 20~100 MeV
· Maximum average beam current: 300 μA
· Maximum irradiation diameter: 30 cm
2. Gaseous ion beam facility
· Beam energy/current: 200 keV/5 mA (N+ standard)
· Ions: H, He, N, Ne, Ar, Xe, Kr, etc.
· Maximum irradiation area: 10 cm×10 cm
3. Metallic ion beam facility
· Beam energy/current: 150 keV/1 mA (Co+ standard)
· Ions: Co, Cr, Fe, Cu, etc.
· Maximum irradiation area: 10 cm×10 cm
4. 1.7 MV tandem
· Beam energy/current: 3.4 MeV/10 μA (H+ standard)
· Ions: H, He, Cl, etc.
· Application fields: PIXE, RBS, ERD, standard neutron source

Publication

Kim M. S., Han J. H., Lee C. E., Curr. Appl. Phys. 2014 Sep 30. pii: 15(15)25-28. doi: 10.1016/j.cap.2014.09.022

Gamma-ray irradiation effects on the photoresponsive thin-film devices based on the regioregular poly(3-hexylthiophene) (RR-P3HT) conjugated polymer have been studied by means of atomic force microscopy, UV-vis absorption, photoluminescence (PL), and time-of-flight measurements. As a result, increased light absorption in the red region and PL quenching induced by the irradiation were observed. Besides, enhancement of the electron/hole mobilities, attributable to improved ordering or increased nanodomain size of the P3HT thin films, was revealed.

Kim D. W., Lee K. W., Choi D. M., Noh S. J., Kim H. S., Lee C. E., Nucl. Instrum. Methods Phys. Res. B 2015 Dec 17. pii: 386(16)54-60. doi: 10.1016/j.nimb.2015.11.028

Helium ion-irradiation effects on the nuclear graphite tiles were studied in order to understand the structural modifications and damages that can be produced by fusion reaction in tokamaks. The surface morphological changes due to increasing dose of the irradiation were examined by the field-effect scanning electron microscopy, and X-ray photoelectron spectroscopy elucidated the changes in the shallow surface bonding configurations caused by the energetic irradiation. Raman spectroscopy revealed the structural defects and diamond-like carbon sites that increased with increasing irradiation dose, and the average inter-defect distance was found from the Raman peak intensities as a function of the irradiation dose.

Choi H. W., Kim S. J., Rim Y.-H., Yang Y. S., J. Phys. Chem. C 2015 Nov 13. pii: 119(15)27192-27199. doi: 10.1021/acs.jpcc.5b06501

We have investigated Li effects on the structural property change in LixNi0.5Mn1.5O4 (LNMO, x = 1, 0.7, 0.5, 0.3, 0.1, 0) by using Rietveld refinement with neutron diffraction measurements. The polycrystalline LNMO samples were synthesized using the sol−gel process and were calcinated at 1000 °C for 10 h. It was found that all the structures of LNMO belong to the face-centered cubic spinel structure Fd3̅m, irrespective of Li amount, and that there exists a small amount of the NiO secondary phase for x = 1. As lithium is extracted from LNMO, oxygen reduction also follows, and the amount of oxygen released (y) from the sample changes in the manner to keep both the amount and the oxidation state of Ni/Mn cations; the total chemical formula can be written as (Lix)x+(Ni0.5Mn1.5)6.25+(O4−y)−(6.25+x) for x ≤ 0.7 and LiNi0.5−δMn1.5O4−y−δ + δNiO with δ = 0.012 for x = 1. Both the lattice constant of a unit cell and the nearest neighbor bond distances of ions in LNMO continuously decrease with the increase of Li content, indicating that the variation of those parameters are much dependent on the strength of coulomb interactions between ions.

Lee K. W., Lee C. E., Sci. Reports 2015 Dec 4. pii: 5(17)17490. doi: 10.1038/srep17490

We have investigated the effect of electronic topological transition on the electric field-induced band gap in sliding bilayer graphene by using the density functional theory calculations. The electric fieldinduced band gap was found to be extremely sensitive to the electronic topological transition. At the electronic topological transition induced by layer sliding, four Dirac cones in the Bernal-stacked bilayer graphene reduces to two Dirac cones with equal or unequal Dirac energies depending on the sliding direction. While the critical electric field required for the band gap opening increases with increasing lateral shift for the two Dirac cones with unequal Dirac energies, the critical field is essentially zero with or without a lateral shift for the two Dirac cones with equal Dirac energies. The critical field is determined by the Dirac energy difference and the electronic screening effect. The electronic screening effect was also found to be enhanced with increasing lateral shift, apparently indicating that the massless helical and massive chiral fermions are responsible for the perfect and imperfect electronic screening, respectively.

Kim T., Lee N., Jung H. K., Kim J. H., Int. J. Energy Res. 2015 Dec 16. pii: 40(16)522-528. doi: 10.1002/er.3470

Multi-layered Ni-63 betavoltaic cell was investigated for improving the current density and the source efficiency. The model of betavoltaic cells, which typically consist of Ni-63 radioisotope source, semiconductors, and electrodes, was built using MCNP6, and the emission and absorption behaviours of beta particles throughout the cell were analysed with changing geometrical shape of the betavoltaic cell and thickness of radioisotope source layer in order to achieve the improved current density and efficiency of the cell. The result showed that the fluence of beta particles generally increases with the increase of radioisotope thickness up to 10 μm in both rectangular and cylindrical geometry, while it remains nearly constant above the specific thickness because of the self-absorption effect. Moreover, the results showed that current density of betavoltaic cell could be achieved in cylindrical geometry (1.67 μA/cm2) comparing with rectangular one (1.54 μA/cm2) based on the optimum thickness of Ni-63 radioisotope thickness with the consideration of self-absorption.

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