Author: Yeon, Y.H.
Paper Title Page
TUPPT004 The Development of Control System for 9 MeV Cyclotron 159
  • Y.S. Lee, J.-S. Chai, S.Y. Jung, H.S. Kim, H.W. Kim, S.H. Kim, J.C. Lee, S.H. Lee, J.K. Park, S. Shin, H.S. Song, Y.H. Yeon
    SKKU, Suwon, Republic of Korea
  • K.-H. Park
    PAL, Pohang, Kyungbuk, Republic of Korea
  The Sungkyunkwan University has developed the 9 MeV cyclotron for producing radio isotopes. In order to operate the cyclotron stably, all sub-systems in the cyclotron are controlled and monitored consistently. Therefore, each sub-system includes control devices, which is developed based on PLC, or DSP chip and the sub control modules interface with main control system in real time. As main control system, we choose the CompactRIO system from NI (National Instrument) to take into account the latency and robust control. The control system has high-performance processor running real-time OS, so that the system can control the cyclotron fast and exactly. In addition, the system can be remotely accessed over the network to monitor the status of cyclotron easily. The configuration of control system for 9 MeV cyclotron and performance test result will be described in this paper.  
TUPPT019 Development Study of Penning Ion Source for Compact 9 MeV Cyclotron 195
  • Y.H. Yeon, J.-S. Chai, T.V. Cong, Kh.M. Gad, M. Ghergherehchi, S.Y. Jung, H.S. Kim, H.W. Kim, S.H. Kim, S.H. Lee, Y.S. Lee, X.J. Mu, S.Y. Oh, S. Shin
    SKKU, Suwon, Republic of Korea
  Funding: This research was supported by WCU (World Class University) program through the National Research Foundation of Korea funded by the Ministry of Education, Science and Technology (R31-2008-10029).
Penning Ion Gauge(PIG) have been used in internal source for cyclotron. PIG source for internal source of 9 MeV cyclotron produces H ion. This source consists of cold cathode which discharges electrons for producing H ion and anode for making plasma wall. Cold cathode material tantalum was used for emitting electrons and tungsten copper alloy was used for anode. The size of PIG source is related to size of cyclotron magnet. Optimization of cathode and anode location and sizing were needed for simplifying this source for reducing the size of compact cyclotron. Transportation of electrons and number of secondary electrons has been calculated by CST particle studio. Motion of H2 gas has been calculated by ANSYS. Calculation of PIG source in 9 MeV cyclotron has been performed by using various chimneys with different size of expansion gap between the plasma boundary and the chimney wall. In this paper design process and experiment result is reported.
TUPPT028 Development of 20 kW RF Amplifier for Compact Cyclotron 212
  • S.H. Lee, J.-S. Chai, T.V. Cong, H.S. Kim, Y.S. Lee, H.S. Song, Y.H. Yeon
    SKKU, Suwon, Republic of Korea
  • J.H. Kim
    KIRAMS, Seoul, Republic of Korea
  Funding: This work was supported by Nuclear R&D program through the National Research Foundation of Korea funded by the Ministry of Education, Science and Technology. (2012-0925001)
Compact cyclotron for PET RI production accelerates H ions using electric field. For accelerating ions in cyclotron, RF amplifier is developed to transmit RF power to RF resonating cavity. RF amplifier generates high-power RF signal up to 20 kW with narrow band frequency. The amplifier device was used of triode vacuum tube operated in cathode-driven. Impedance matching systems were composed of bridge-network system. Components of impedance matching system had rigid structure to endure high-power RF signal. Variable inductors of matching components have been used of short-bar movement system for changing reactance of characteristic impedance. The experiment results were measured by VSWR meter and network analyzer.
TUPPT030 Development of 1.5 kW RF Driver for Compact Cyclotron 218
  • H.S. Song, J.-S. Chai, T.V. Cong, S.Y. Jung, H.S. Kim, S.H. Lee, Y.S. Lee, S. Shin, Y.H. Yeon
    SKKU, Suwon, Republic of Korea
  • J.H. Kim
    KIRAMS, Seoul, Republic of Korea
  1.5 kW RF driver is being designed and manufactured with the resonance frequency of 83.2 MHz. Triode (3CX1500A7) is used for RF power amplification, and ground grid amplifier (G.G. Amp.) type was adopted for this RF driver since the circuit design and realization is simple. Anode, and cathode voltage of RF driver is approximately 3500V, and 5V respectively. In this paper, impedance matching process of RF driver is described. Variable capacitor and variable inductor is utilized to implement the impedance matching for cathode and anode. In addition, RF power output characteristics compared with RF input is shown.  
WEPPT017 Beam Tracking Simulation for a 9 MeV Cyclotron 356
  • S.Y. Jung, J.-S. Chai, J.-S. Chai, H.W. Kim, S.H. Kim, Y.S. Lee, H.S. Song, Y.H. Yeon
    SKKU, Suwon, Republic of Korea
  Following the adoption of internal PIG ion source making cyclotron more compact, the delicate beam trajectory simulation is required. In this paper, the optimization of initial condition of H-beam for the stable and well-controlled beam until the extraction region is reported. To accommodate the beam, the electromagnetic field distribution was analyzed by OPERA-3D and its phase error was verified with CYCLONE v8.4. In each iterative design, the beam trajectory was calculated by own developed numerical code to estimate its performance. The beam characteristics including the beam orbit, centering, energy gain and RF acceptance for vertical and horizontal directions were evaluated.