TE 4862 Thyratron Power Triggering System for the

TE 4862 Thyratron Power Triggering System for the CERN Kicker Systems E. De Nicolas, E. Carlier TE 4862 2

What is a kicker magnet? Kickers are fast pulsed magnets used to switch a particle beam between two paths Types of kicker magnets: • Injection: Merge two beams into one single line • Extraction: Kick the beam out of an accelerator TE 4862 3

What is a Thyratron? • • • Switch with similar operating characteristics as the thyristor (SCR) Based on gas ionization technology Suitable for high power applications with short switching times Thyristor Thyratron TE 4862 4

Objective of this project Pulse Forming Network Thyratron Kicker magnets Triggering System Analysis of the different types of Thyratron power triggering systems currently in operation across the whole accelerator complex Design, develop and prototype of a new system compatible with all the different existing configurations TE 4862 5

Systems currently in operation Power Mos HV Trigger Amplifier 1600 V IGBT Thyratron Trigger 400 V IGBT Thyratron Trigger Voltage 3500 1600 400 Current 70 32 12 Tfall <50 ns <300 ns Tdelay <250 ns <300 ns Wide range of output voltages: 3500 V - 400 V Worst Case Scenario: Power Mos HV Trigger Amplifier TE 4862 6

New Thyratron Trigger Line DC/DC Converter Resonant Power Supply SCR Based on Power Mos HV Trigger Amplifier Trig_IN Thyratron Grid Mosfet trigger Adapt the output pulse voltage with the DC/DC converter First step is design the Mosfet trigger TE 4862 7

Current Mosfet Trigger • • • Vo=3500 V Io~70 A Tfall<50 ns Tdelay~250 ns 4 Mosfets in Series Balance voltages in the mosfets TE 4862 8

Mosfet vs IGTB technology Isolated Gate Bipolar Transistor Combination of Bipolar Transistor and Mosfet • • Voltage drive device like the Mosfets Higher Voltages than Mosfets Higher Currents than Mosfets Less speed than Mosfets TE 4862 9

New ‘Mosfet Trigger’ prototype Only one switch!! TE 4862 10

New “Mosfet” Trigger prototype Minimum gate resistant on the IGTB Select IGTB Gate Voltage TE 4862 11

New “Mosfet” Trigger prototype 100 160 90 140 70 120 60 100 tdalay(ns) tfall(ns) 80 50 40 30 80 60 40 20 20 10 0 0 10 15 20 24 Driver Voltage(V) 30 10 15 20 24 30 Driver Voltage(V) 24 V is the optimal point TE 4862 12

New “Mosfet” Trigger • • Vo=3500 V Io~70 A Tfall<50 ns Tdelay<100 ns One IGBT IXA 40 I 4000 KN 24 V IGTB Gate Voltage Minimum Gate Resistance in IGBT Increase the speed of the IGTB through a fast driver TE 4862 13

Actions planed in short term. Line DC/DC Converter Resonant Power Supply SCR Trig_IN “Mosfet” trigger Output specifications have been achieved Prototype the Resonant HV Power Supply • Prototype DC/DC Converter • TE 4862 14

Thank you!! TE 4862 15