Title :
SNS LEBT Chopper improvements
Author :
Saethre, Robert ; Peplov, V.
Author_Institution :
SNS, Oak Ridge Nat. Lab., Oak Ridge, TN, USA
Abstract :
The Low Energy Beam Transport (LEBT) Chopper for the Spallation Neutron Source (SNS) at Oak Ridge National Laboratory has experienced failures of the power semiconductors within the tri-state pulsed power supplies. These power supplies deliver a +/- 3 kV pulse or ground potential to an electrostatic einzel lens split into four quadrants to deflect the beam for 200 ns to 1 us. The four power supplies are ac coupled to a -50 kV dc supply for steering offset of the lens. This paper discusses the failure modes and improvements to mitigate future failures.
Keywords :
lenses; linear accelerators; neutron sources; nuclear spallation; power semiconductor devices; pulsed power supplies; LINAC; Oak Ridge National Laboratory; SNS LEBT Chopper improvements; dc supply; electrostatic einzel lens; failure modes; ground potential; low energy beam transport; power semiconductors; power supplies; spallation neutron source; steering offset; time 200 ns to 1 mus; voltage -50 kV; LEBT; Power MOSFET; gate drive; pulsed power;
Conference_Titel :
Power Modulator and High Voltage Conference (IPMHVC), 2012 IEEE International
Conference_Location :
San Diego, CA
Print_ISBN :
978-1-4673-1222-6
DOI :
10.1109/IPMHVC.2012.6518842
