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Huang, J. Y.

Paper Title Page
MOPAN061 Compact Output Filter for Switching Frequency Elimination at the PLC Linac New Magnet Power Supply 293
  • S.-C. Kim, J. Choi, K. M. Ha, J. Y. Huang
    PAL, Pohang, Kyungbuk
  Funding: This work is supported by the Ministry of Science and Technology, Korea.

At 2006, PLS Linac magnet power supply (MPS) has been upgraded for the stable beam injection and 4th generation light source research. New MPS are developed new compact MPS of 16-bit resolution and 20ppm stability using four-quadrant switching scheme with 50kHz MOSFET switching device, and consists of main power board, control power board, regulator board and CPU board. Size of each board is only 100mm width and 240mm depth. Output of MPS is 10V, ±10A for the bipolar and 50V, 50A for the unipolar magnet. Main board is consisted four-quadrant FET switch, driver and output filter. Output filter must be perfectly eliminating switch frequency and compact size. In this paper, we report on development and characteristics of compact output filter of the new MPS for PAL linac.

TUPMN064 Experimental Approaches for the Beam Dynamics Study in the PC RF Gun at the PAL 1070
  • J. H. Park, J. Y. Huang, C. Kim, I. S. Ko, Y. W. Parc, S. J. Park
    PAL, Pohang, Kyungbuk
  • D. Xiang
    TUB, Beijing
  Funding: This work is supported in parts by the Center for High Energy Physics at the KNU and the Grant No. R01-2006-000-11309-0 from the Basic Research Program of the Korea Science and Engineering Foundation.

A high-brightness electron beam is emitted from a photo-cathode (PC) RF gun for use in the FIR (Far Infrared) facility being built at the Pohang Accelerator Laboratory (PAL). The beam dynamics study for the PAL XFEL injector is essencial to generate low emittance electron beam from the PC RF gun. The XFEL injector requires 1 nC beam with short bunch length and low emittance. This conditions are simulated with PARMELA code and then are realized on experimental conditions. The experimental conditions for the XFEL injector are measured with beam diagnostic devices such as ICT and Faraday cup for charge measurement, a spectrometer for beam energy measurement. In this article, we present the experimental approaches of the beam dynamics study for the XFEL injector.

wpjho@postech.ac.kr (Jangho Park)

WEPMN062 HOM Analysis and Design of its Removal System for SRF 3rd Harmonic RF Cavity in PLS 2179
  • Y. U. Sohn, J. Choi, M.-H. Chun, J. Y. Huang, I. S. Ko, I. S. Park
    PAL, Pohang, Kyungbuk
  Funding: Korea Ministry of Science & Technology

Pohang Accelerator Laboratory has prepared to SRF 3rd harmonic cavity to increase beam lifetime and to damp orbit instability by lengthening electron bunch in PLS. The SRF cavity was developed and its vertical test was done already with success. Higher order modes were analyzed to optimize its performance in beam orbit. Most of them are not effective to electron beam, while the others have possibility to impact orbit stability. These harmful HOMs can be removed by HOM absorber installed in beam pipe. This paper reports the HOM analysis and design of its removal system.