A FAST 60 kV RESONANT CHARGING POWER SUPPLY FOR THE LHC INFLECTORS - Printable Version +- Free Academic Seminars And Projects Reports (https://easyreport.in) +-- Forum: Seminars Topics And Discussions (https://easyreport.in/forumdisplay.php?fid=30) +--- Forum: Miscellaneous Seminars Topics (https://easyreport.in/forumdisplay.php?fid=21) +---- Forum: General Seminar Topics (https://easyreport.in/forumdisplay.php?fid=58) +---- Thread: A FAST 60 kV RESONANT CHARGING POWER SUPPLY FOR THE LHC INFLECTORS (/showthread.php?tid=51865) |
A FAST 60 kV RESONANT CHARGING POWER SUPPLY FOR THE LHC INFLECTORS - midphoenix13 - 10-04-2017 A FAST 60 kV RESONANT CHARGING POWER SUPPLY FOR THE LHC INFLECTORS [attachment=16615] INTRODUCTION The European Laboratory for Particle Physics (CERN) is designing a Large Hadron Collider (LHC) to be installed in an existing 27 km circumference tunnel. The LHC requires Injection Kicker Systems, devices for fast deflecting the incoming particle beams onto the accelerator s circular trajectory. Two pulsed systems, of 4 magnets and 4 PFNs each, are required for injection[1,2]. POWER SEMICONDUCTOR SWITCH If a thyratron turns-on erratically, during the recovery period of the power semiconductor switch, the semiconductor can be subjected to a forward dV/dt of 90 V/ms[4]. An SCR with suitable ratings for use in the RCS has a turn-off time (tq) of typically several hundred microseconds. During the recovery period, forward voltage cannot be applied across the semiconductor switch without it turning on, and an SCR has a limited capability to withstand positive dV/dt when forward voltage is reapplied. SNUBBER COMPONENTS The purpose of the snubber circuit is to limit the dV/dt across the GTO to an acceptable value. During normal operation, the ECT is increased at a rate of 32 ms/mF of the snubber capacitor value, and thus it is desirable to minimise the value of the snubber capacitor. TRANSFORMER TURNS RATIO The charge time is determined approximately by the leakage inductance of the transformer and the effective capacitance. |