Title :
New design of the SNS MEBT chopper deflector
Author :
Aleksandrov, A. ; Deibele, C. ; Roseberry, T.
Author_Institution :
Oak Ridge Nat. Lab., Oak Ridge
Abstract :
The chopper system for the spallation neutron source (SNS) provides a gap in the beam for clean extraction from the accumulator ring. It consists of a pre-chopper in the low energy beam transport and a faster chopper in the medium energy beam transport (MEBT). The original "meander line" design of the MEBT chopper deflector was successfully tested with low power beam during the SNS linac commissioning but turned out to be unsuitable for high power beam operation due to poor cooling of the copper strip line through the dielectric substrate. We developed a new deflecting structure, with higher deflection efficiency and with rise and fall time easily customizable to match the available high voltage pulse generator. In this paper we describe design, implementation and beam tests results of the new MEBT chopper deflector.
Keywords :
linear accelerators; neutron beams; neutron sources; particle beam diagnostics; particle beam dynamics; particle beam extraction; MEBT chopper deflector; SNS linac; accumulator ring; beam extraction; copper strip line; dielectric substrate; high power beam operation; high voltage pulse generator; low energy beam transport; medium energy beam transport; spallation neutron source; Choppers; Cooling; Copper; Dielectric substrates; Linear particle accelerator; Neutrons; Pulse generation; Strips; Testing; Voltage;
Conference_Titel :
Particle Accelerator Conference, 2007. PAC. IEEE
Conference_Location :
Albuquerque, NM
Print_ISBN :
978-1-4244-0916-7
DOI :
10.1109/PAC.2007.4440908
