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Park, K.-H.

Paper Title Page
TUPPH017 In Vacuum Undulator System for PAL-FEL 271
 
  • D. E. Kim, H. S. Han, C. K. Kim, H.-G. Lee, S. H. Nam, C. D. Park, K.-H. Park, H. S. Suh, Y. G. Young-Gyu
    PAL, Pohang, Kyungbuk
  • M. Yoon
    POSTECH, Pohang, Kyungbuk
  
  Pohang Accelerator Laboratory (PAL) is planning to develop a 0.1 nm SASE based FEL as a next generation light source. It will be based on the 10 GeV S-band linac with In Vacuum Undulator system. The proposed in vacuum undulator has 22.3 mm magnetic period with 5.0 mm vertical clearance aperture. The magnetic length will be 4014 mm with breaks between undulators for diagnostic and focusing elements. The mechanical and magnetic requirements of the IVUN system are very challenging. In this report, the design issues related to the development of the IVUN with preliminary magnetic design will be presented.  
TUPPH084 Field Mapping System for KIRAMS-30 Cyclotron Magnet 442
 
  • K.-H. Park, D. E. Kim, Y. G. Young-Gyu, Y. D. Yun
    PAL, Pohang, Kyungbuk
  • J.-S. Chai, J. Kang
    KIRAMS, Seoul
  • B.-K. Kang
    POSTECH, Pohang, Kyungbuk
  
  This paper presents a Hall probe mapping system for measuring a cyclotron magnet, which has been fabricated for the 30 MeV cyclotron at the Korea Institute of Radiological and Medical Sciences. The Hall probes are mounted on a precision mechanical stage and map magnetic field in the Cylindrical coordinate system. The mapping system uses the “flying” mode field mapping method to reduce data-acquisition time. The time required for mapping the whole gap-area of the cyclotron magnet is ~70 minutes. The relative random fluctuation error during the entire mapping process is less than ±0.02%. The cyclotron magnet has been corrected using field measurement data, and the achieved total phase excursion of the cyclotron after correction is less than ±15°, which is within the tolerance of ±20° for the total phase excursion.  
TUPPH085 Digital Power Supply for Air Core Magnet 445
 
  • S.-H. Jeong, J. Choi, D. E. Kim, K.-H. Park
    PAL, Pohang, Kyungbuk
  
  This paper presents the air core magnet power supply for the Pohang Light Source. The required current to energize the air core magnet was ±5 A with the high precision of ~2ppm resolution to accomplish a stable beam orbit correction. This power supply has been implemented using the digital signal processing technology and shows the high stability and other good responses. Various experimental results such as stability, bandwidth and simulation are given in this paper.