IPAC2016 - List of Authors (Cho, Y.-S.)

Paper	Title	Page
MOPMB056	Measurements of the Beam Energy and Beam Profile of 100 MeV Proton Linac at KOMAC	217
	S.G. Lee, Y.-S. Cho, H.S. Kim, H.-J. Kwon Korea Atomic Energy Research Institute (KAERI), Gyeongbuk, Republic of Korea
	Funding: This work has been supported through KOMAC operation fund of KAERI by Ministry of Science, ICT and Future Planning. The linac for generation of the 100 MeV proton beam is operating in KOMAC. The 100 MeV proton beam is used in the industrial and the scientific fields such as improvement of the material characteristics and production of the isotope. The accurate measurements of the proton beam energy and profile are necessary for increasing the efficiency of the application and minimizing the inadequate radioactivation in linac structure caused by the beam loss. The proton beam energy and beam profile are measured by using the TOF (time-of-flight) method with a BPM (beam position monitor) and the ion chamber array, respectively. The detailed measurement setup and the measured results will be given in this paper.
DOI •	reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-MOPMB056
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MOPMW019	Resonant Frequency Control with RCCS for the KOMAC Proton Linac	435
	D.H. Seo, Y.-S. Cho, H.S. Kim, H.-J. Kwon, K.T. Seol, Y.G. Song Korea Atomic Energy Research Institute (KAERI), Gyeongbuk, Republic of Korea
	Funding: This work is supported by the Ministry of Science, ICT & Future Planning of the Korean Government. The Resonance control cooling systems (RCCS) of 100 MeV proton linac at the Korea multi-purpose accelerator complex (KOMAC) have been operated for cooling the drift tubes (DT) and controlling the resonant frequency of the drift tube linac (DTL). The RCCS can maintain the cooling water temperature within ±0.1 °C by controlling 3-way valve opening. The RCCS has two types of control mode, the constant cooling water temperature control mode and the resonant frequency control mode. In the case of the resonant frequency control, the error frequency is measured in the low-level RF (LLRF) control system and the RCCS compensates the error frequency by controlling the cooling water temperature of DT with PID algorithm. In this paper, the operation results of the resonant frequency control with the RCCS as well as some modification of the LLRF system are presented.
DOI •	reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-MOPMW019
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MOPMY023	High Power Test of the RF System for the KOMAC MEBT	552
	S.G. Kim, Y.-S. Cho, H.S. Kim, H.-J. Kwon Korea Atomic Energy Research Institute (KAERI), Gyeongbuk, Republic of Korea Y.G. Song KAERI, Gyeongbuk, Republic of Korea
	Funding: This work has been supported through KOMAC (Korea Multi-purpose Accelerator Complex) operation fund of KAERI by MSIP (Ministry of Science, ICT and Future Planning) A 100 MeV proton linac of the Korea multi-purpose accelerator complex (KOMAC) has been operated for providing a proton beam to users. RF systems of two medium energy beam transports (MEBT) have been designed to improve a beam quality. An operating frequency of the MEBT RF system is 350 MHz, and the required RF power is 44 kW for MEBT-1 and 18 kW for MEBT-2. The RF duty is 9% (1.5 ms, 60 Hz), and an RF stability of ±1% in amplitude and ±1° in phase is required. The RF system includes a low-level RF (LLRF) control system, a solid state RF amplifier (SSPA) as a 60 kW SSPA for MEBT-1 and a 30 kW SSPA for MEBT-2, a coaxial circulator, and 3-1/8" coaxial line components. A RF power test to the MEBT has been performed with 4 kW SSPA before the full power operation. The configuration and high power test results of the MEBT RF system are presented in this paper.
DOI •	reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-MOPMY023
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MOPOY040	Design of the 100 MeV Proton Beam Line for Low Flux Application	938
	H.-J. Kwon, Y.-S. Cho, C.R. Kim, H.S. Kim, S.G. Lee, S. Lee, S.P. Yun Korea Atomic Energy Research Institute (KAERI), Gyeongbuk, Republic of Korea
	Funding: This work was supported by the Ministry of Science, ICT & Future Planning of the Korean Government. KOMAC has been operating two beam lines for user service since 2013. A new beam line was completed in 2015 for radioisotope production and has a plan to be commissioned in 2016. Another beam line was proposed to supply low flux beam to users. The maximum energy and average current are 100 MeV and 10 nA. The beam line consists of collimator, energy degrader, dipole magnet for energy separation and octupole magnet for uniform beam production. In this paper, the design of the beam line and its components is presented.
DOI •	reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-MOPOY040
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TUPMR001	Preliminary Test of 1 Mv Electrostatic Accelerator at Komac	1222
	D.I. Kim KAERI, Daejon, Republic of Korea Y.-S. Cho, H.-J. Kwon, S.H. Park Korea Atomic Energy Research Institute (KAERI), Gyeongbuk, Republic of Korea
	Funding: This work was supported by the Ministry of Education, Science and Technology of the Korean Government. 1 MV electrostatic accelerator is being developed to satisfy the needs from the users, especially for the applications with a MeV range ion beam implantation at KOrea Multi-purpose Accelerator Complex (KOMAC). Typically, the accelerator consists of ion source, beam transport system and target chamber. For the accelerating voltage of a MeV range, ELV type high voltage power supply has been selected. And then, ion source has been selected as the newly developed RF ion source which can be installed inside the pressure vessel of high voltage power supply due to its limited space and electrical power. In this paper, preliminary test of 1 MV electrostatic accelerator including test results in test stand is presented.
DOI •	reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-TUPMR001
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TUPMR031	Implementation and Preliminary Test of Electron Beam Ion Sources at KOMAC	1311
	S. Lee, Y.-S. Cho, H.S. Kim, H.-J. Kwon Korea Atomic Energy Research Institute (KAERI), Gyeongbuk, Republic of Korea
	Funding: This work has been supported through KOMAC operation fund of KAERI by Ministry of Science, ICT and Future Planning. Electron beam ion source (EBIS) has been one of widely used table-top devices for the production of highly charged ions by electron impact ionization. An EBIS employs a magnetically compressed, high energy and density electron beam to sequentially ionize atoms or ions with a low charge state. At KOMAC, we have a compact room-temperature operated EBIS. It is additionally constructed with a magnetic mass spectrometer and a Faraday Cup to measure charge spectra. Using this measurement setup, preliminary tests are performed to find suitable operational potentials in the EBIS for a stable production of highly charge ions. In future, we aim to build an EBIS based pre-injector with a radio frequency quadrupole. It has advantages of having a simple operation and a large number of ion species. For this, we intend to improve and modify the current EBIS design to incorporate with existing setups at KOMAC. M. A. Levin et al., Phys. Scr. T22, 157-163 (1988) ** J. Alessi et al., EBIS Pre-Injector Project Conceptual Design Report, Brookhaven National Laboratory (2005)
DOI •	reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-TUPMR031
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TUPMR044	Beam Test of the New Beamline for Radio-Isotope Production at KOMAC	1349
	H.S. Kim KAERI, Daejon, Republic of Korea Y.-S. Cho, H.-J. Kwon, S.P. Yun Korea Atomic Energy Research Institute (KAERI), Gyeongbuk, Republic of Korea
	Funding: This work has been supported through KOMAC (Korea Multi-purpose Accelerator Complex) operation fund of KAERI by MSIP (Ministry of Science, ICT and Future Planning). A high power proton linac is under operation at Korea multi-purpose accelerator complex (KOMAC). Currently, two beamlines are available and used to provide 20-MeV beam and 100-MeV beam to users from various fields. An additional 100-MeV beamline has been constructed mainly for production of radio-isotopes such as Sr-82 and Cu-67. Proton beam with the beam energy of 100 MeV and the average current of 0.6 mA is directed to the production target, which is located in a water-filled target chamber, through a beam window made of AlBeMet. The beam size at the target is designed to be about 100 mm in diameter. Installation of the beamline components including 1.5 T bending magnet and the beam diagnostic devices such as BPM and BCM is finished and beam commissioning is planned to start in early 2016. The details of newly-constructed beamline and the initial beam test results will be given in this paper.
DOI •	reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-TUPMR044
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TUPMR055	Solid Targetry for the Isotope Production Facility at the KOMAC 100 MeV Linac	1384
	S.P. Yun, Y.-S. Cho, H.S. Kim, H.-J. Kwon, K.T. Seol, Y.G. Song Korea Atomic Energy Research Institute (KAERI), Gyeongbuk, Republic of Korea D.I. Kim KAERI, Daejon, Republic of Korea
	Funding: *This work was supported by the Ministry of Science, ICT and Future Planning of the Korean Government. The construction of the isotope production facility was recently completed on the 100 MeV proton linac at the KOMAC (Korea multi-purpose accelerator complex). To produce the Sr-82 and Cu-67, we have prepared the solid targetry which consist of target transportation system , target cooling system and a hot-cell for remote handling. The Isotope production targets are made of RbCl pellet and stainless steel cladding. For the proton beam irradiation, the targets are transported by target drive system which consist of drive chain and guide rail by remotely. In this paper, we will report the detailed design, fabrication and operation status of the solid targetry at the KOMAC isotope production facility.
DOI •	reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-TUPMR055
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TUPOY036	Diffusion and Thermal Stability of Implanted Hydrogen in ZnO Nanorods	1982
	J.K. Park, Y.-S. Cho, H.-J. Kwon, K.T. Seol, S.P. Yun Korea Atomic Energy Research Institute (KAERI), Gyeongbuk, Republic of Korea
	Funding: This work has been supported through KOMAC operation fund of KAERI by Ministry of Science ICT and Future Planning of Korean Government. The 20-MeV proton-beams with a fluence of 10¹² cm^-2 were irradiated on ZnO nanorods. The effects of proton-beam irradiation on ZnO nanorods are investigated by using ¹H nuclear magnetic resonance (NMR) spectroscopy. After irradiation, new and modified NMR resonance lines are observed in ¹H NMR spectra. The diffusion and thermal stability of each proton species are investigated from the lab- and rotating-frame spin-lattice relaxation data depending on temperature. Understanding the properties of thermally stable hydrogen species created by the beam irradiation may promise many possible applications, since the hydrogen stable up to high temperature only meets the device working conditions.
DOI •	reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-TUPOY036
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WEPMR050	Development of Web-based User Interface for Beam Status Monitoring of 100-MeV Proton Linac	2389
	Y.G. Song, J.H. Kim KAERI, Gyeongbuk, Republic of Korea Y.-S. Cho, H.-J. Kwon Korea Atomic Energy Research Institute (KAERI), Gyeongbuk, Republic of Korea
	Funding: This work was supported by the Ministry of Science, ICT & Future Planning of the Korean Government. The goal of web-based user interface is to create a user interface which makes it easy and efficient to operate the KOMAC facility. A web-based user interface for a beam status monitoring of the KOMAC 100 MeV linac and beam lines has been developed with accessing Experimental Physics and Industrial Control System (EPICS) Channel Access (CA) protocol and relational database. Web service is combined with EPICS CA protocol. As a result, a beam operator and user can monitor the beam status in real time by using a web browser of remote PC or wireless device. In this paper, we are describing the implementation of web-based user interface for a beam status monitoring of the KOMAC proton linac.
DOI •	reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-WEPMR050
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WEPOR039	Development of 200 MHz Digital LLRF System for the 1 MeV/n RFQ at KOMAC	2758
	H.S. Jeong, T.S. Ahn, Y.-S. Cho, H.S. Kim, S.G. Kim, H.-J. Kwon Korea Atomic Energy Research Institute (KAERI), Gyeongbuk, Republic of Korea Y.G. Song KAERI, Daejon, Republic of Korea
	KOMAC (Korea Multi-purpose Accelerator Complex) has a plan to develop the multipurpose ion irradiation system. This system includes the ion source, LEBT, RFQ and MEBT systems to transport ion particles to the target. In particular, the RFQ (Radio Frequency Quadrupole) system should receive 200 MHz RF within 1% amplitude error stability. To supply stable 200 MHz RF signal to the RFQ cavity, the LLRF (Low-Level Radio Frequency) system should be controlled through a control system which implemented using commercial digital board. This 1 MeV/n RFQ LLRF system has a concept to minimize the number of the analog components for minimizing the control error. For this, the FPGA (Field Programmable Gate Array) in the digital board will control the frequency of the output sinusoidal signal. In addition, this LLRF system applied the direct sampling, Non-IQ sampling, direct RF generation and fast IQ set update rate algorithm. In this presentation, the FPGA control logics of the LLRF digital board will be introduced. Also, the LLRF PI control logic test using 200 MHz dummy cavity will be described.
DOI •	reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-WEPOR039
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THPMY022	Design of the Beam Dump for Low Flux Beamline in KOMAC	3702
	C.R. Kim, Y.-S. Cho, H.S. Kim, H.-J. Kwon Korea Atomic Energy Research Institute (KAERI), Gyeongbuk, Republic of Korea
	Funding: This work has been supported through KOMAC (Korea Multi-purpose Accelerator Complex) operation fund of KAERI by MSIP (Ministry of Science, ICT and Future Planning) A linac in KOMAC (Korea Multi-Purpose Accelerator Complex) is providing users with 100-MeV proton beam for various applications. A new target room (TR102) for low dose of radiation beam will be constructed in 2016. The beam dump is an important part of this beam line and must be designed to stop 100 MeV beams with a maximum power of 10 kW. Incepting the waste of beam increases the temperature of the beam dump, which can make a structural problem. Therefore, the material of it should be robust under the high temperature and the radioactive circumstance. To ensure safety, thermo-mechanical analyses have been performed for a few materials using a finite element code. The beam dump will be fabricated based on the analysis results.
DOI •	reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-THPMY022
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THPOY012	Implementation of Data Acquisition System for Operating Condition in the 100 Mev Proton Linac	4110
	J.H. Kim, Y.-S. Cho, H.-J. Kwon, Y.G. Song Korea Atomic Energy Research Institute (KAERI), Gyeongbuk, Republic of Korea
	Funding: The Ministry of Science, ICT & Future Planning of the Korean Government. The goal of data acquisition system is to provide an efficient user interface to analyze operating condition of the KOMAC linac. The KOMAC control system which is based on Experimental physics and Industrial Control System (EPICS) has been monitoring and archiving the operating condition using Channel Access (CA) protocol. A data acquisition system has been developed with Qt framework that accesses EPICS IOCS and MySQL database via EPICS CA protocol. The data acquisition system provides calibrated data and efficient function to analyze data easily. In this paper, we are describing the implementation of data acquisition system for operating condition in the 100-MeV proton linac.
DOI •	reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-THPOY012
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Paper

Title

Page

Measurements of the Beam Energy and Beam Profile of 100 MeV Proton Linac at KOMAC

217

S.G. Lee, Y.-S. Cho, H.S. Kim, H.-J. Kwon
Korea Atomic Energy Research Institute (KAERI), Gyeongbuk, Republic of Korea

Funding: This work has been supported through KOMAC operation fund of KAERI by Ministry of Science, ICT and Future Planning.
The linac for generation of the 100 MeV proton beam is operating in KOMAC. The 100 MeV proton beam is used in the industrial and the scientific fields such as improvement of the material characteristics and production of the isotope. The accurate measurements of the proton beam energy and profile are necessary for increasing the efficiency of the application and minimizing the inadequate radioactivation in linac structure caused by the beam loss. The proton beam energy and beam profile are measured by using the TOF (time-of-flight) method with a BPM (beam position monitor) and the ion chamber array, respectively. The detailed measurement setup and the measured results will be given in this paper.

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reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-MOPMB056

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MOPMW019

Resonant Frequency Control with RCCS for the KOMAC Proton Linac

435

D.H. Seo, Y.-S. Cho, H.S. Kim, H.-J. Kwon, K.T. Seol, Y.G. Song
Korea Atomic Energy Research Institute (KAERI), Gyeongbuk, Republic of Korea

Funding: This work is supported by the Ministry of Science, ICT & Future Planning of the Korean Government.
The Resonance control cooling systems (RCCS) of 100 MeV proton linac at the Korea multi-purpose accelerator complex (KOMAC) have been operated for cooling the drift tubes (DT) and controlling the resonant frequency of the drift tube linac (DTL). The RCCS can maintain the cooling water temperature within ±0.1 °C by controlling 3-way valve opening. The RCCS has two types of control mode, the constant cooling water temperature control mode and the resonant frequency control mode. In the case of the resonant frequency control, the error frequency is measured in the low-level RF (LLRF) control system and the RCCS compensates the error frequency by controlling the cooling water temperature of DT with PID algorithm. In this paper, the operation results of the resonant frequency control with the RCCS as well as some modification of the LLRF system are presented.

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MOPMY023

High Power Test of the RF System for the KOMAC MEBT

552

S.G. Kim, Y.-S. Cho, H.S. Kim, H.-J. Kwon
Korea Atomic Energy Research Institute (KAERI), Gyeongbuk, Republic of Korea
Y.G. Song
KAERI, Gyeongbuk, Republic of Korea

Funding: This work has been supported through KOMAC (Korea Multi-purpose Accelerator Complex) operation fund of KAERI by MSIP (Ministry of Science, ICT and Future Planning)
A 100 MeV proton linac of the Korea multi-purpose accelerator complex (KOMAC) has been operated for providing a proton beam to users. RF systems of two medium energy beam transports (MEBT) have been designed to improve a beam quality. An operating frequency of the MEBT RF system is 350 MHz, and the required RF power is 44 kW for MEBT-1 and 18 kW for MEBT-2. The RF duty is 9% (1.5 ms, 60 Hz), and an RF stability of ±1% in amplitude and ±1° in phase is required. The RF system includes a low-level RF (LLRF) control system, a solid state RF amplifier (SSPA) as a 60 kW SSPA for MEBT-1 and a 30 kW SSPA for MEBT-2, a coaxial circulator, and 3-1/8" coaxial line components. A RF power test to the MEBT has been performed with 4 kW SSPA before the full power operation. The configuration and high power test results of the MEBT RF system are presented in this paper.

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MOPOY040

Design of the 100 MeV Proton Beam Line for Low Flux Application

938

H.-J. Kwon, Y.-S. Cho, C.R. Kim, H.S. Kim, S.G. Lee, S. Lee, S.P. Yun
Korea Atomic Energy Research Institute (KAERI), Gyeongbuk, Republic of Korea

Funding: This work was supported by the Ministry of Science, ICT & Future Planning of the Korean Government.
KOMAC has been operating two beam lines for user service since 2013. A new beam line was completed in 2015 for radioisotope production and has a plan to be commissioned in 2016. Another beam line was proposed to supply low flux beam to users. The maximum energy and average current are 100 MeV and 10 nA. The beam line consists of collimator, energy degrader, dipole magnet for energy separation and octupole magnet for uniform beam production. In this paper, the design of the beam line and its components is presented.

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TUPMR001

Preliminary Test of 1 Mv Electrostatic Accelerator at Komac

1222

D.I. Kim
KAERI, Daejon, Republic of Korea
Y.-S. Cho, H.-J. Kwon, S.H. Park
Korea Atomic Energy Research Institute (KAERI), Gyeongbuk, Republic of Korea

Funding: This work was supported by the Ministry of Education, Science and Technology of the Korean Government.
1 MV electrostatic accelerator is being developed to satisfy the needs from the users, especially for the applications with a MeV range ion beam implantation at KOrea Multi-purpose Accelerator Complex (KOMAC). Typically, the accelerator consists of ion source, beam transport system and target chamber. For the accelerating voltage of a MeV range, ELV type high voltage power supply has been selected. And then, ion source has been selected as the newly developed RF ion source which can be installed inside the pressure vessel of high voltage power supply due to its limited space and electrical power. In this paper, preliminary test of 1 MV electrostatic accelerator including test results in test stand is presented.

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TUPMR031

Implementation and Preliminary Test of Electron Beam Ion Sources at KOMAC

1311

S. Lee, Y.-S. Cho, H.S. Kim, H.-J. Kwon
Korea Atomic Energy Research Institute (KAERI), Gyeongbuk, Republic of Korea

Funding: This work has been supported through KOMAC operation fund of KAERI by Ministry of Science, ICT and Future Planning.
Electron beam ion source (EBIS) has been one of widely used table-top devices for the production of highly charged ions by electron impact ionization. An EBIS employs a magnetically compressed, high energy and density electron beam to sequentially ionize atoms or ions with a low charge state*. At KOMAC, we have a compact room-temperature operated EBIS. It is additionally constructed with a magnetic mass spectrometer and a Faraday Cup to measure charge spectra. Using this measurement setup, preliminary tests are performed to find suitable operational potentials in the EBIS for a stable production of highly charge ions. In future, we aim to build an EBIS based pre-injector with a radio frequency quadrupole. It has advantages of having a simple operation and a large number of ion species**. For this, we intend to improve and modify the current EBIS design to incorporate with existing setups at KOMAC.
* M. A. Levin et al., Phys. Scr. T22, 157-163 (1988)
** J. Alessi et al., EBIS Pre-Injector Project Conceptual Design Report, Brookhaven National Laboratory (2005)

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TUPMR044

Beam Test of the New Beamline for Radio-Isotope Production at KOMAC

1349

H.S. Kim
KAERI, Daejon, Republic of Korea
Y.-S. Cho, H.-J. Kwon, S.P. Yun
Korea Atomic Energy Research Institute (KAERI), Gyeongbuk, Republic of Korea

Funding: This work has been supported through KOMAC (Korea Multi-purpose Accelerator Complex) operation fund of KAERI by MSIP (Ministry of Science, ICT and Future Planning).
A high power proton linac is under operation at Korea multi-purpose accelerator complex (KOMAC). Currently, two beamlines are available and used to provide 20-MeV beam and 100-MeV beam to users from various fields. An additional 100-MeV beamline has been constructed mainly for production of radio-isotopes such as Sr-82 and Cu-67. Proton beam with the beam energy of 100 MeV and the average current of 0.6 mA is directed to the production target, which is located in a water-filled target chamber, through a beam window made of AlBeMet. The beam size at the target is designed to be about 100 mm in diameter. Installation of the beamline components including 1.5 T bending magnet and the beam diagnostic devices such as BPM and BCM is finished and beam commissioning is planned to start in early 2016. The details of newly-constructed beamline and the initial beam test results will be given in this paper.

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TUPMR055

Solid Targetry for the Isotope Production Facility at the KOMAC 100 MeV Linac

1384

S.P. Yun, Y.-S. Cho, H.S. Kim, H.-J. Kwon, K.T. Seol, Y.G. Song
Korea Atomic Energy Research Institute (KAERI), Gyeongbuk, Republic of Korea
D.I. Kim
KAERI, Daejon, Republic of Korea

Funding: *This work was supported by the Ministry of Science, ICT and Future Planning of the Korean Government.
The construction of the isotope production facility was recently completed on the 100 MeV proton linac at the KOMAC (Korea multi-purpose accelerator complex). To produce the Sr-82 and Cu-67, we have prepared the solid targetry which consist of target transportation system , target cooling system and a hot-cell for remote handling. The Isotope production targets are made of RbCl pellet and stainless steel cladding. For the proton beam irradiation, the targets are transported by target drive system which consist of drive chain and guide rail by remotely. In this paper, we will report the detailed design, fabrication and operation status of the solid targetry at the KOMAC isotope production facility.

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TUPOY036

Diffusion and Thermal Stability of Implanted Hydrogen in ZnO Nanorods

1982

J.K. Park, Y.-S. Cho, H.-J. Kwon, K.T. Seol, S.P. Yun
Korea Atomic Energy Research Institute (KAERI), Gyeongbuk, Republic of Korea

Funding: This work has been supported through KOMAC operation fund of KAERI by Ministry of Science ICT and Future Planning of Korean Government.
The 20-MeV proton-beams with a fluence of 10¹² cm^-2 were irradiated on ZnO nanorods. The effects of proton-beam irradiation on ZnO nanorods are investigated by using ¹H nuclear magnetic resonance (NMR) spectroscopy. After irradiation, new and modified NMR resonance lines are observed in ¹H NMR spectra. The diffusion and thermal stability of each proton species are investigated from the lab- and rotating-frame spin-lattice relaxation data depending on temperature. Understanding the properties of thermally stable hydrogen species created by the beam irradiation may promise many possible applications, since the hydrogen stable up to high temperature only meets the device working conditions.

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WEPMR050

Development of Web-based User Interface for Beam Status Monitoring of 100-MeV Proton Linac

2389

Y.G. Song, J.H. Kim
KAERI, Gyeongbuk, Republic of Korea
Y.-S. Cho, H.-J. Kwon
Korea Atomic Energy Research Institute (KAERI), Gyeongbuk, Republic of Korea

Funding: This work was supported by the Ministry of Science, ICT & Future Planning of the Korean Government.
The goal of web-based user interface is to create a user interface which makes it easy and efficient to operate the KOMAC facility. A web-based user interface for a beam status monitoring of the KOMAC 100 MeV linac and beam lines has been developed with accessing Experimental Physics and Industrial Control System (EPICS) Channel Access (CA) protocol and relational database. Web service is combined with EPICS CA protocol. As a result, a beam operator and user can monitor the beam status in real time by using a web browser of remote PC or wireless device. In this paper, we are describing the implementation of web-based user interface for a beam status monitoring of the KOMAC proton linac.

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WEPOR039

Development of 200 MHz Digital LLRF System for the 1 MeV/n RFQ at KOMAC

2758

H.S. Jeong, T.S. Ahn, Y.-S. Cho, H.S. Kim, S.G. Kim, H.-J. Kwon
Korea Atomic Energy Research Institute (KAERI), Gyeongbuk, Republic of Korea
Y.G. Song
KAERI, Daejon, Republic of Korea

KOMAC (Korea Multi-purpose Accelerator Complex) has a plan to develop the multipurpose ion irradiation system. This system includes the ion source, LEBT, RFQ and MEBT systems to transport ion particles to the target. In particular, the RFQ (Radio Frequency Quadrupole) system should receive 200 MHz RF within 1% amplitude error stability. To supply stable 200 MHz RF signal to the RFQ cavity, the LLRF (Low-Level Radio Frequency) system should be controlled through a control system which implemented using commercial digital board. This 1 MeV/n RFQ LLRF system has a concept to minimize the number of the analog components for minimizing the control error. For this, the FPGA (Field Programmable Gate Array) in the digital board will control the frequency of the output sinusoidal signal. In addition, this LLRF system applied the direct sampling, Non-IQ sampling, direct RF generation and fast IQ set update rate algorithm. In this presentation, the FPGA control logics of the LLRF digital board will be introduced. Also, the LLRF PI control logic test using 200 MHz dummy cavity will be described.

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reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-WEPOR039

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THPMY022

Design of the Beam Dump for Low Flux Beamline in KOMAC

3702

C.R. Kim, Y.-S. Cho, H.S. Kim, H.-J. Kwon
Korea Atomic Energy Research Institute (KAERI), Gyeongbuk, Republic of Korea

Funding: This work has been supported through KOMAC (Korea Multi-purpose Accelerator Complex) operation fund of KAERI by MSIP (Ministry of Science, ICT and Future Planning)
A linac in KOMAC (Korea Multi-Purpose Accelerator Complex) is providing users with 100-MeV proton beam for various applications. A new target room (TR102) for low dose of radiation beam will be constructed in 2016. The beam dump is an important part of this beam line and must be designed to stop 100 MeV beams with a maximum power of 10 kW. Incepting the waste of beam increases the temperature of the beam dump, which can make a structural problem. Therefore, the material of it should be robust under the high temperature and the radioactive circumstance. To ensure safety, thermo-mechanical analyses have been performed for a few materials using a finite element code. The beam dump will be fabricated based on the analysis results.

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reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-THPMY022

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THPOY012

Implementation of Data Acquisition System for Operating Condition in the 100 Mev Proton Linac

4110

J.H. Kim, Y.-S. Cho, H.-J. Kwon, Y.G. Song
Korea Atomic Energy Research Institute (KAERI), Gyeongbuk, Republic of Korea

Funding: The Ministry of Science, ICT & Future Planning of the Korean Government.
The goal of data acquisition system is to provide an efficient user interface to analyze operating condition of the KOMAC linac. The KOMAC control system which is based on Experimental physics and Industrial Control System (EPICS) has been monitoring and archiving the operating condition using Channel Access (CA) protocol. A data acquisition system has been developed with Qt framework that accesses EPICS IOCS and MySQL database via EPICS CA protocol. The data acquisition system provides calibrated data and efficient function to analyze data easily. In this paper, we are describing the implementation of data acquisition system for operating condition in the 100-MeV proton linac.

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reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-THPOY012

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