Author: Park, S.S.
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MOPMY026 Development of an X-Band Linearizer System for PAL-XFEL 554
 
  • H. Heo, J. Hu, H.-S. Kang, K.H. Kim, S.H. Kim, H.-S. Lee, B.G. Oh, S.S. Park, Y.J. Park, Y.J. Suh
    PAL, Pohang, Republic of Korea
 
  We developed an X-band RF system for the linear bunch compression in the PAL-XFEL. We installed a SLAC X-band accelerating structure on a precise mover stage and applied RF power by using a SLAC XL-4 11.424 GHz klystron driven by an inverter charging type modulator. We are developing a solid state amplifier controlled by an X-band LLRF system instead of using a TWTA as a driving RF source for the klystron. We present and discuss the recent test results of the system.  
DOI • reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-MOPMY026  
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THOBB01 PAL-XFEL Linac RF System 3192
 
  • H.-S. Lee, H. Heo, J. Hu, H.-S. Kang, K.W. Kim, K.H. Kim, S.H. Kim, I.S. Ko, S.S. Park, Y.J. Park
    PAL, Pohang, Kyungbuk, Republic of Korea
  • H. Matsumoto
    KEK, Tokai, Ibaraki, Japan
 
  The PAL-XFEL hard X-ray linac has a 716 m long gallery and tunnel for 10 GeV. Forty nine modulators are necessary in the hard X-ray gallery for an X-band linearizer, an S-band RF gun, two S-band deflectors and 45 S-band klystrons for accelerating structures. They have been installed completely from March 15, 2015 to December 30, 2015 after completing the building construction. There are 51 modulators, 178 accelerators structures, 42 SLEDs in the hard X-ray linac and the soft X-ray linac. The RF conditioning of the klystrons, SLEDs and accelerating structures were stated from November 24, 2015. We describe the PAL-XFEL system and the current status of the linac RF system.  
slides icon Slides THOBB01 [22.023 MB]  
DOI • reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-THOBB01  
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THPMW012 The Fast Interlock Controller for High Power Pulse Modulator at PAL-XFEL 3561
 
  • S.H. Kim, H.-S. Kang, K.H. Kim, S.J. Kwon, H.-S. Lee, S.S. Park, Y.J. Park
    PAL, Pohang, Kyungbuk, Republic of Korea
  • I.S. Ko
    POSTECH, Pohang, Kyungbuk, Republic of Korea
 
  Funding: This work is supported by Ministry of Science, ICT(Information/Communication Technology) and Future Planning.
The modulator control system for PAL-XFEL consists of a PLC unit (Programmable Logic Controller) and FPSCM (Fast Pulse Signal Conditioning Module). There are two kinds of interlock, which are dynamic and static interlocks categorized as analogue monitor and control signals, digital monitor and control signals. In case of dynamic interlocks, the internal interface of the PLC unit had to be modified due to operating within 10 ms time response from the interlock event. The fast pulse signal conditioning module is adopted for preconditioning the fast pulse and DC signals that inherently have high noise levels generated from a beam voltage, a beam current and EOLC current. Those EM (Electro-Magnetic) noises are generated by thyratron switching. The amplitude of the thyratron noise is large which causes the problem at the control devices, frequently. In this paper, the test results of the interlock control system will be described.
 
DOI • reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-THPMW012  
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THPMW024 Phase Tuning Results of the Waveguide Network System at Pal 3597
 
  • K.H. Kim, S.H. Kim, H.-S. Lee, S.S. Park, Y.J. Park
    PAL, Pohang, Kyungbuk, Republic of Korea
 
  We report the results of the phase tuning of the waveguide network system with the C-clamp tool and the resonance frequency tuning for the SLAC energy doubler. The high power waveguide network which dividing and feeding the power to the four accelerating structures. The phase length is adjusted within ± 0.25 degrees with a transmission phase measuring method. The resonant frequency range for the SLAC energy doubler is 2856 MHz ± 5 kHz, but a target range is 2856 MHz ± 1 kHz. We measured the phase length and an amplitude with a vector network analyser. The test setup consists of a SLED, a waveguide network, directional couplers, phase stable cables. All components of the waveguide networks were manufactured at VITZRO TECH and tested at the accelerator tunnel in the Pohang Accelerator Laboratory (PAL).  
DOI • reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-THPMW024  
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