Author: Cho, Y.-S.
Paper Title Page
MOPIK091 Development of Real-Time Charge Integrator for the Irradiation Dose Measurement 739
 
  • H.G. Lim, Y.-S. Cho, Y.S. Hwang, M.H. Jung, K. R. Kim
    Korea Atomic Energy Research Institute (KAERI), Gyeongbuk, Republic of Korea
 
  Funding: This work has been supported through KOMAC (KOREA of Multi-purpose Accelerator Complex) operation fund of KAERI by MSIP (Ministry of Science, ICT, and Future Planning).
KOMAC (Korea of Multi-purpose Accelerator Complex, Gyeongju, Korea) has several kinds of facilities using proton beam or ion beam. The KOMAC has provided beam service to user group since 2013. For effective beam service, it is important that irradiation dose at a target should be supplied as much as user requires. To control the irradiation dose of target, a multi-channels charge integrator, Faraday cups, and a beam shutter are used. The amount of irradiation dose is calculated in real time by accumulative charge, which is represented to integration of induced current at each Faraday cup for the target. If the measurements reach to the set value (desired dose), the beam is automatically blocked by beam shutter. Thus, precise measurement of accumulative charge is required. For out purpose, two kinds of real-time charge integrators were implemented with different measuring ranges. In order to verify performance of the integrators, each device's linearity was evaluated after measuring accumulative charge corresponding to dc current. And their measurable range was determined.
 
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-MOPIK091  
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TUPVA108 Development of 1 MeV/n RFQ for Ion Beam Irradiation 2343
 
  • H.S. Kim
    KAERI, Daejon, Republic of Korea
  • Y.-S. Cho, H.-J. Kwon, Y.G. Song, 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).
For the purpose of the ion beam irradiation, especially for helium beam application to semiconductor industry, an ion beam RFQ is under development at KOMAC (Korea Multi-purpose Accelerator Complex). The output energy of the RFQ is determined to be 1 MeV/n, which corresponds to 4 MeV in helium beam case, in consideration of the penetration depth in the silicon substrate. The RFQ is a four-vane type and will be fabricated through vacuum brazing technique. The RF power of 130 kW at 200 MHz will be provided to the RFQ by using a solid-state RF amplifier through two coaxial RF couplers with coaxial RF windows. The details of the RFQ development including some design features and fabrication methods will be given in this paper.
 
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-TUPVA108  
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TUPVA111 Design of the Secondary Particle Production Beam Line at KOMAC 2346
 
  • H.-J. Kwon, Y.-S. Cho, J.J. Dang, H.S. Kim, Y.G. Song, 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.
A 100-MeV proton linac is under operation since 2013 at KOMAC (Korea Multi-purpose Accelerator Complex) and provides the accelerated proton beam to various users from the research institutes, universities and industries. To expand the utilization fields of the accelerator, we are planning to develop a target ion source to produce a secondary particle such as Li-8 based on the existing linac. A test beam line was designed to supply proton beam to target ion source. Details on the beam line design are presented.
 
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-TUPVA111  
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THPAB131 Test of the Feedback and Feedforward Control Loop for Digital LLRF System of 1 MeV/n RFQ 4028
 
  • H.S. Jeong, Y.-S. Cho, H.S. Kim, J.H. Kim, S.G. Kim, H.-J. Kwon, Y.G. Song
    Korea Atomic Energy Research Institute (KAERI), Gyeongbuk, Republic of Korea
 
  Funding: This work has been supported through KOMAC (Korea of Multi-purpose Accelerator Complex) operation fund of KAERI by MSIP (Ministry of Science, ICT and Future Planning)
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 LLRF PI control and feed-forward control logic test using 200 MHz dummy cavity will be described.
LLRF, direct sampling, Non-IQ, RFQ, control loop, feedback, feedforward
 
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-THPAB131  
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