Title :
Upgrade of the SRS klystron power supply
Author :
Moss, A.J. ; Smith, R.J. ; Griffiths, S.A.
Author_Institution :
Daresbury Lab., Warrington, UK
Abstract :
The RF system for the 2 GeV Synchrotron Radiation Source (SRS), at Daresbury Laboratory consists of a 250 kW klystron feeding four normal conducting cavities via a waveguide feeder system. The klystron power converter is a 50 kV 15 A conventional roller regulator 6-pulse rectifier set with capacitor smoothing, giving an energy storage of 27 kJ. There is a ´crowbar´ system using 4 ignitrons in series, this dumps the stored energy in 6 μS for the protection of the klystron under spark conditions. Control of the klystron output is by adjustment of the modulating anode voltage with a 50 kV high voltage power supply incorporated within the main power converter. The power converter was designed and built 25 years ago and is now giving poor reliability, and is difficult and time consuming to maintain. Almost all the problems can be traced to the ´crowbar´ and modulation anode system causing false firing of the protection circuits
Keywords :
accelerator RF systems; electron accelerators; klystrons; power convertors; rectifiers; storage rings; 15 A; 2 GeV; 250 kW; 27 kJ; 50 kV; RF system; SRS; Synchrotron Radiation Source; capacitor smoothing; crowbar; ignitrons; klystron power supply; modulation anode; power converter; roller regulator 6-pulse rectifier; spark conditions; Anodes; Capacitors; Klystrons; Laboratories; Power supplies; Power system protection; Radio frequency; Rectifiers; Regulators; Synchrotron radiation;
Conference_Titel :
Particle Accelerator Conference, 2001. PAC 2001. Proceedings of the 2001
Conference_Location :
Chicago, IL
Print_ISBN :
0-7803-7191-7
DOI :
10.1109/PAC.2001.988216
