[en] Recently, big needs on high flux 14 MeV fast neutron facility are made to test the related materials (and others) on the field of new fission reactors and fusion reactor. Also movable fast neutron generator is useful for production of radioisotopes, bomb detection, medial machine and non-destructive test. Through this project the core technologies for high flux 14 MeV fusion neutron source will be developed. In this sudy the following scopes are covered; ○ Survey of present technology on the high flux 14 MeV fusion neutron source. ○ Development of key technologies for the 14 MeV fusion neutron source. ○ Construction of heavy ion accelerator system to use heavy ion beam for material test, nano study and other new fields. The results of this study is summarized as follows; ○ Development of key technologies for 14 MeV neutron source - fabrication of prototype movable 14 MeV neutron generator - survey of fusion tritium technologies - design of fast neutron detection system ○ Construction of coolant circulation system and power distribution system for DIAC (Deajeon Ion Accelerator complex).

[en] A heavy ion beam facility, which is based on the transferred heavy ion accelerator TRIAC (Tokai Radioactive Isotope Accelerator Complex) from KEK of Japan, is being constructed at KAERI with a new name DIAC (Daejeon Ion Accelerator Complex). The assembly of the main beam line of the facility, which is composed of an ECR ion source, a RFQ and IH linear accelerators, has been finished, and the important characteristics of the accelerator has been measured successfully. Radiation shielding is necessary to start beam tuning and beam acceleration. Also three target rooms are being designed to use the heavy ion beam in the various R and Ds. The present status and future plan of the heavy ion beam facility will be discussed in this present. A heavy ion beam facility is being constructed at KAERI to open the opportunities to the internal researchers on materials, bio, nano and others topics. We will try the facility be open to other researchers with a stable beam in a nearest future

[en] A high current ion implanter of the energy of 100 Kev and the current of about 100 mA has been developed for using the high dose ion implantation, surface modification of steels and ceramics, and ion beam milling. The characteristics of the beam extraction and transportation are investigated. A duoPIGatron ion source compatible with gas ion extraction of about 100 mA, a single gap acceleration tube which is able to compensate the divergence due to the space charge effect, and a beam transport system with the concept of the space charge neutralization are developed for the high current machine. The performance of the constructed machine shows that nitrogen, argon, helium, hydrogen and oxygen ion beams are successfully extracted and transported at a beam divergence due to space charge effect is negligible in the operation pressure of 2 x 10^-5 torr. (author)

[en] DIAC (Daejeon Ion Accelerator Complex) system was developed, and operated at JAEA of Japan by KEK team with a name of TRIAC (Tokai Radioactive Ion Accelerator Complex) during 2004 to 2010. The TRIAC control system was based on LabView and had two independent control units for ion source and accelerator. To be an efficient system, it is necessary to have an integrated control capability. And the control software, which had implemented by using LabView at TRIAC, will be changed with EPICS in order to give an effective beam service to the users. In this presentation, the old TRIAC control system is described, and a new control system for DIAC is discussed. The control system of DIAC is based on TRIAC. But it is gradually improved performance using EPICS toolkits and changing some digital interface hardware of it. Details of the control system will be demonstrated during the conference

[en] A reliable and high repetition-rate double pulsed thyratron driver has been developed. It can deliver a high current pre-pulse and a fast rising 1.3 kV positive trigger pulse which can be superimposed onto a negative DC 150 V bias voltage. The pre-pulse and the fast rising trigger pulse result in stable switching operation of the thyratron

[en] A pulse modulator for pulse discharge lasers has been developed. It consists of a DC high voltage power supply, a charging inductor, a thyratron, and 2 stage magnetic pulse compression network. Its output voltage is 27.5 kV, operating pulse repetition rate is several 10s kHz, and energy transfer efficiency from charging capacitor to final output pulse is about 65%. In this paper, the brief design equations and the operational characteristics of the developed prototype pulse modulator are presented

[en] The KAERI Laser Facility with five beams for fast ignition research and high energy physics applications has been designed and is being constructed. Four beam lines with a clear aperture of 100mm have been constructed. Each beam has been amplified to about 250 J of energy at the nano second regime. Near field patterns of the rod amplifiers are shown in Fig. 1(a). The gain of each rod amplifier was 110 J with a beam diameter of 67mm. The energy variation of the 80mm rod amplifier was less than 5% during the experiment. Figure 1(b)shows a near field pattern of the 110mm disk amplifier. The energy of the 110mm rod amplifier was 260 J in 8 nano seconds with a beam diameter of 99mm. The maximum gain of the disk amplifier was 2.3. The oscillator wavelength (Quanta ray Pro 230, Spectra Physics)is 1064nm, which is far from Nd:Glass (Hoya LHG 8, LHG80)wavelength of 1053nm. Considering the hybrid combination with Nd"3+":Glass bulk amplifiers, the signal of 4nm spectrum is designed. The pump laser used is a custom commercial Q switched Nd:YAG. It is a Single Longitudinal Mode laser that generates a train of 600mJ pulses at 10Hz. The pulse length is 10ns with a Gaussian shape and a wavelength of 532nm. The non linear medium used for the amplification is β Barium Borate(BBO)for the two stages. The maximum gain of the OPCPA system was about 10"6"by series two stages in the new OPCPA scheme. Combination of nano second high energy beams with a pico second high power beam is expected to open up a new physics field for high energy density plasma science. KLF is expected to demonstrate its first laser plasma experiment through 4 beams by early 2009

[en] The Daejeon ion accelerator complex (DIAC) is being built at Korea atomic energy research institute (KAERI) in order to fulfill an increasing demand for heavy ion beam facilities for various purposes including structural material study, biological research and nanomaterial treatment. Based on devices of the Tokai radioactive ion accelerator complex (TRIAC) given from the high energy accelerator research organization (KEK), Japan, the dedicated accelerators in the DIAC are designed to produce stable heavy ion beams with energies up to 1 MeV/u and beam currents up to 300 μA. In this article, recent construction status of the DIAC are presented and discussed. From the successful full-power test results, we confirmed that the IH and RFQ linacs work properly and then they are ready to accelerate heavy ions up to 1.09 MeV/nucleon. The construction of lead shields on DIAC devices is now in progress, and the beam tuning and test will be done soon until the end of this year

[en] Ion implantation technology is now an established part of semiconductor materials processing, but also receives increasing industrial attentions for engineering applications. Recent industrial applications of the high current ion beams, such as buried dielectric layer formation in silicon by oxygen ion implantation and surface modifications of the ferrous materials by nitrogen ion implantation, require very high implant doses in the range of 10¹⁷∼10¹⁸ ions/cm² in view of the stoichiometric requirements. An ion implanter of the energy of 100 keV and current of about 100 mA compatible with high implant dose has been designed. The design is based on the experimental data of a DuoPIGatron source developed last year which has provided nitrogen ion current of about 100 mA, and construction experiences of the deuteron accelerator for D-T neutron generation. The details of the study are as follows: 1.Overall design of the ion implanter 2.Design of high current accelerator tube which is able to control the ion optical properties for the compensation of the space charge effect 3.Design of the magnetic quadrupole doublet for control of the beam size on the target 4.Design of the high beam power slit and of beam diagnostics system 5.Design of the 2-D rotational target turntable for the high density beam irradiation 6.Study on the high current beam transport system 7.Modification of the beam extraction system in the DuoPIGatron for improvement of ion beam current. Especially, the beam divergence duo to the space - charge effect during acceleration and transportation is surveyed, and the electrostatic suppression and the neutralization of space charges are suggested. (Author)

[en] The Daejeon ion accelerator complex (DIAC) is being constructed to meet demands for heavy ion beams. A facility for cooling the DIAC system was installed in 2014 as part of the construction. The cooling facility consists of primary and secondary water cooling circuit and the dedicated control panel. For the installation of the primary circuit, system transferred from the Tokai radioactive ion accelerator complex (TRIAC) in Japan was utilized. The secondary circuit and cooling facility related programmable logic controller (PLC) based control panel were newly built. Although the DIAC cooling system is in a stable state, there is a need for method to ensure that it is operating normally. Using the information provided by the various sensors and the status of the actuators, the cooling system can be operated in one of the predefined states. The operator can recognize the problem and change the state of the cooling system when the cooling system is out of the predefined state. That is, it is possible for the operator to check the status of the cooling system only when necessary. This paper describes the introduction of the Experimental physics and industrial control system (EPICS) based DIAC cooling system and how to implement it so that the DIAC cooling system can operate safely during the experiment. The DIAC cooling system is made up of an EPICSbased control system. The control system of the DIAC cooling system will be improved to minimize the operator’s control, and if this is completed, we will be able to focus more on the DIAC beam experiment. As a result of the study, we will identify sensors and actuators that need to be further automated and reflect them in our upcoming cooling system upgrades.