Author: Woo, H.J.
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Overview of Beam Diagnostics System for Heavy Ion Accelerator Facility, RAON  
  • H.J. Woo
    IBS, Daejeon, Republic of Korea
  The ultimate goal of the superconducting LINAC at RISP is to accelerate uranium and proton beams up to 200 MeV/u and 600 MeV, with a maximum beam currents of 8.3 puA and 660 puA, respectively. The driver linac is divided into several sections: low energy superconducting linac SCL1 for stable ions and SCL3 for rare isotopes, charge stripper section, and high energy superconducting linac (SCL2). Various types of beam diagnostic devices such as beam current monitor, beam position monitor, beam profile monitor, beam phase monitor, and beam loss monitor, etc. are required for the setting of accelerator parameters, the monitoring and control of beam acceleration and transport, and improvement of accelerator system. The arrangement of beam diagnostic devices was initially based on the result of beam dynamics calculation, and now the overall layout becomes almost settled. More than 600 devices will be installed for commissioning and normal operation. This report introduces the overall layout of the beam diagnostic system and presents status of the system construction including a commissioning diagnostic station to characterize the accelerated beam from the superconducting LINAC.  
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Calibration for 60 Sets of SCL3 BPM and Electronics in RAON  
  • J.W. Kwon, Y.S. Chung, G.D. Kim, H.J. Woo
    IBS, Daejeon, Republic of Korea
  • E.-S. Kim
    KUS, Sejong, Republic of Korea
  RAON (Rare isotope accelerator complex for On-line experiments) is an accelerator to produce heavy ion such as uranium, oxygen, and proton. Required transverse position resolution and accuracy on RAON for BPM are 150 um and is 400 um, respectively. BPM fabrication error, ADC gain of electronics and cable characteristics are related to the resolution and the accuracy. Electronics of Mobiis measure positions with IQ method for 1st, 2nd and 3rd harmonic frequencies of 81.25 MHz. Considering the frequency dependence of BPMs and electronics, and the correlation between each BPM and electronics, we obtained calibration factors for 60 BPMs and 60 electronics for three frequency harmonic components. The merits of this way, three frequencies can be selected to measure the beam positions depending on beam energy, and the BPM and electronics can be switched to other devices. In this poster we present a calibration results for 60 sets of BPM, electronics by off-line test.  
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