operation experience of srf system for the pls-ii · operation status and experience of pls-ii srf...
TRANSCRIPT
Operation Experience of SRF system for the PLS-II
M.H. Chun, Y.D. Joo, I.H. Yu, I.S. Park, Y.U. Sohn, and H.J ParkAccelerator Department, Pohang Accelerator Laboratory (PAL), POSTECH
80 jigokro 127, Nam-gu, Pohang 37673, S. KOREA, e-mail: [email protected]
The SRF system of the Pohang Light Source-II (PLS-II) storage ring is operating at the 3.0 GeV/400 mA with three superconducting RF (SRF) cavities.
PLS-II SRF system was upgraded to 3.0 GeV/400 mA beam storage from 2.5 GeV/200 mA of PLS in 2011. Each high power RF (HPRF) station is composed of a
300 kW klystron with a Klystron Supply Unit (KSU), transmission components including a 350 kW circulator and load, and water cooling system. The TH2161B
300 kW klystrons are stably operated as an RF power source with KSU of 55 kV/12 A at PAL as well as some light sources. Also PLS-II SRF system are included
three digital type low level RF (LLRF), RF operation diagnosis, three Cryomodules made by RI and a Cyrogenic system of 700W capacity made by Air Liquide.
This poster describes the present operation status and experience of PLS-II SRF system as well as 300 kW HPRF system.
ABSTRACT
Operation Parameters of PLS-II SRF System
Overview of PLS-II & PAL-XFEL
FAULT List of HPRF (2015~2018.6)
Major Blocks of PLS-II SRF system
Brief History of PLS, PLS-II & PAL-XFEL
Operation Efficiency of Klystron RF Power
Klystron TH2161B(Thales) & KSU(Ampegon)
Cryomodules @ Tunnel with Waveguides
SUMMARY
WR1800 Waveguide w/ Circulator, Load
Operation status and experience of PLS-IISRF system are introduced. The 360 or 400 mAbeam at 3 GeV has been operated with top-upmode for 34 beam-line users in 2018.
PLS-II HPRF system is reliably operating withsome faults every year. Most faults are caused byKSU’s minor problems such as PSMs, Ion pumpcurrent, focus power supply, cooling water, fan,and so on. The klystrons operating hour is about34,000 hours average without any severeproblem. Klystron efficiency is adjusted 65% forelectricity saving and lifetime, but limited bylinearity with LLRF control. Study on the properoperations of SRF system will be continued withmakers and other similar light sources.
10th CW and High Average RF Power Workshop June 25 to 29, 2018. Hsinchu, Taiwan