Author: Nam, S.H.
Paper Title Page
MOPEA048 Operation Status of RF System for the PLS-II Storage Ring 187
  • M.-H. Chun, J.Y. Huang, Y.D. Joo, H.-G. Kim, S.H. Nam, C.D. Park, H.J. Park, I.S. Park, Y.U. Sohn, I.H. Yu
    PAL, Pohang, Kyungbuk, Republic of Korea
  Funding: Supported by the Korea Ministry of Science and Technology
The RF system of the Pohang Light Source-II (PLS-II) storage ring is operating at the 3.0GeV/200mA with two superconducting RF (SRF) cavities. Each RF station is composed with a 300kW klystron with power supply unit, transmission components, a digital LLRF and a SRF cavity. And a cryogenic system of 700W capacities is supplied the LHe and LN2 to three cryomodules of SRF cavities. The second SRF cavity is installed during at the beginning in 2013 and the third one will be installed during summer shutdown in 2014 for stable 400mA operation with all 20 insertion devices. Also the third high power RF station with a 300kW klystron, power supply unit and WR1800 waveguide components will be prepared in 2013. The third LLRF system is already installed, but improved stabilities of amplitude, phase and tuner control. This paper describes the present operation status and improve plan of the RF system for the PLS-II storage ring.
MOPEA049 The First Experience of PLS-II Operation 190
  • S.H. Nam, M.-H. Cho, J.Y. Huang, C.D. Park, S. Shin
    PAL, Pohang, Kyungbuk, Republic of Korea
  Funding: Mministry of Education, Science and Technology (MEST) of Korea
One of recent major activities of the Pohang Accelerator Laboratory (PAL) in Korea has been PLS-II user operation. The PLS-II is a Korea’s only and brand new 3rd generation synchrotron radiation source that was upgraded from the 16-year-old PLS in 2011. The old PLS started user service from 1995 and shutdown on Dec. 10, 2010. The PLS-II has been open to users from March 2012 with upgraded performance. The performance parameters of the PLS-II are 5.8 nm-rad emittance, 3.0GeV beam energy, and 400mA beam current with the top-up injection. The unique feature of PLS-II will be the implementation of 20 insertion-devices in a compact double-bend-achromat storage ring of 280m-long circumference. Among 20 insertion-devices, 14 are in-vacuum undulators. The first year operation in 2012 will be successfully completed and the operational statistics will be summarized and discussed.
WEPWO041 Beam Commissioning Superconducting RF Cavities for PLS-II Upgrade 2390
  • Y.U. Sohn, M.-H. Chun, J.Y. Huang, Y.D. Joo, S.H. Nam, C.D. Park, H.J. Park, I.S. Park, I.H. Yu
    PAL, Pohang, Kyungbuk, Republic of Korea
  Two superconducting RF cavities were commissioned with electron beam at PLS-II, which is upgraded machine from PLS with 3 GeV, 20 insertion devices, and now on user service. These srf cavities have been prepared during last 3 years. Each cavity was tested with higher than 2 MV rf voltage and 125 kW standing wave power at CW mode after installation at storage ring. PLS-II is on user operation with 200 mA beam current now, and on the way of beam current improvement upto 400mA, by synchrotron conditioning for beam chamber and in-vacuum udulators. Upto 200 mA beam current no beam instability from the higher order modes is observed. With top-up mode operation, the errors of amplitude of rf field and phase are recorded as 0.3% and 0.3 degree peak to peak, respectively during one day. Successful PLS-II upgrade with hardware and its designed performance will be declared at the end of 1st half user run in 2013.