Effect of Magnetic Fringe Field and Interference on Beam Matching in a Medium Energy Beam Transport Line of the Spallation Neutron Source Linac

Journal Article · Sat Jan 01 00:00:00 EST 2011 · Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment

DOI:https://doi.org/10.1016/j.nima.2011.06.002· OSTI ID:1018963

Wang, Jian-Guang ^[1]; Zhang, Yan ^[1]

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1. ORNL

A Medium-Energy Beam Transport (MEBT) line is employed in the SNS linac to match the beam from an RFQ to a DTL and to perform other functions. The MEBT lattice consists of fourteen electromagnetic quadrupoles and other devices. The quads have very small aspect ratios (steel length over aperture diameter), and they are densely packed in the lattice. Significant fringe fields and magnetic interference cause difficulties in beam matching. We have performed 3D simulations of the magnets, computed their optical properties, and compared their performance with what predicted by simple hard edge models. This paper reports our findings and a general solution to the problem.

• Research Organization: Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Spallation Neutron Source (SNS)
• Sponsoring Organization: USDOE Office of Science (SC)
• DOE Contract Number: DE-AC05-00OR22725
• OSTI ID: 1018963
• Journal Information: Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, Vol. 648, Issue 1; ISSN 0168-9002
• Country of Publication: United States
• Language: English

Related Subjects

43 PARTICLE ACCELERATORS
APERTURES
ASPECT RATIO
BEAM TRANSPORT
LINEAR ACCELERATORS
MAGNETS
NEUTRON SOURCES
OPTICAL PROPERTIES
PERFORMANCE
QUADRUPOLES
SPALLATION