PAC2013 - List of Authors (Peplov, V.V.)

Paper	Title	Page
FRYBB2	Development and Operation of the SNS Fast Chopper Systems	1473
	R.B. Saethre ORNL RAD, Oak Ridge, Tennessee, USA D.E. Anderson, C. Deibele, V.V. Peplov, M.P. Stockli ORNL, Oak Ridge, Tennessee, USA
	The Spallation Neutron Source (SNS) at Oak Ridge National Laboratory requires fast chopper systems to create a series of mini-pulses in the Linear Accelerator (LINAC) for injection into the accumulation ring. The fast chopper systems are in the front end of the accelerator with one set of four choppers in the Low Energy Beam Transport (LEBT), immediately upstream of the Radio Frequency Quadrupole (RFQ), and another set of two choppers in the Medium Energy Beam Transport (MEBT), downstream of the RFQ, where the beam energy is approximately 2.5 MeV. Clean bunching requires fast rise and fall time and low jitter to minimize the amount of charge in the ring extraction gap. The chopper systems operate at a burst frequency of 1 MHz and a burst width of greater than 1 ms. The choppers have had historically poor reliability especially in the LEBT system. This paper describes the development of reliable LEBT and MEBT choppers and the operational performance since SNS commissioning in 2006.

Paper

Title

Page

Development and Operation of the SNS Fast Chopper Systems

1473

R.B. Saethre
ORNL RAD, Oak Ridge, Tennessee, USA
D.E. Anderson, C. Deibele, V.V. Peplov, M.P. Stockli
ORNL, Oak Ridge, Tennessee, USA

The Spallation Neutron Source (SNS) at Oak Ridge National Laboratory requires fast chopper systems to create a series of mini-pulses in the Linear Accelerator (LINAC) for injection into the accumulation ring. The fast chopper systems are in the front end of the accelerator with one set of four choppers in the Low Energy Beam Transport (LEBT), immediately upstream of the Radio Frequency Quadrupole (RFQ), and another set of two choppers in the Medium Energy Beam Transport (MEBT), downstream of the RFQ, where the beam energy is approximately 2.5 MeV. Clean bunching requires fast rise and fall time and low jitter to minimize the amount of charge in the ring extraction gap. The chopper systems operate at a burst frequency of 1 MHz and a burst width of greater than 1 ms. The choppers have had historically poor reliability especially in the LEBT system. This paper describes the development of reliable LEBT and MEBT choppers and the operational performance since SNS commissioning in 2006.