2. TE4862 Thyratron Power Triggering System for the CERN Kicker Systems
E. De Nicolas, E. Carlier
TE 4862

3. 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

4. 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
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5. Objective of this project
Pulse Forming Network
Thyratron
Kicker magnets
Trigger 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
TE4862

6. Systems currently in operation
Power Mos HV Trigger Amplifier
1600V IGBT Thyratron Trigger
400V IGBT Thyratron Trigger
Voltage
3500
1600
400
Current 70 32 12
Tfall
<50ns
<300ns
Tdelay
<250ns
Wide range of output voltages: 3500V - 400V
Worst Case Scenario: Power Mos HV Trigger Amplifier
TE4862

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

8. Current Mosfet Trigger
Vo=3500V
Io~70A
Tfall<50ns
Tdelay~250ns
4 Mosfets in Series
Balance voltages in the mosfets
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9. 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
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10. New ‘Mosfet Trigger’ prototype
Only one switch!!
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11. New “Mosfet” Trigger prototype
Minimum gate resistant on the IGTB
Select IGTB Gate Voltage
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12. New “Mosfet” Trigger prototype
24 V is the optimal point
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13. New “Mosfet” Trigger Vo=3500V Io~70A Tfall<50ns Tdelay<100ns
One IGBT IXA40I4000KN
24V IGTB Gate Voltage
Minimum Gate Resistance in IGBT
Increase the speed of the IGTB through a fast driver
TE 4862

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

15. Thank you!!
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