Open AccessMultipole Spill-Down Effects in the SPEAR3 Dipole Magnets
Author(s) -
William Corbett
Publication year - 1999
Publication title -
osti oai (u.s. department of energy office of scientific and technical information)
Language(s) - English
Resource type - Reports
DOI - 10.2172/10522
Subject(s) - multipole expansion , magnet , force between magnets , dipole , physics , beam (structure) , offset (computer science) , magnetic field , dipole magnet , magnetic dipole , fast multipole method , interaction point , atomic physics , computational physics , optics , superconducting magnet , magnetic energy , magnetization , quantum mechanics , computer science , programming language
The main SPEAR3 dipole magnets are 1.45 m long with a pole contour designed to horizontally deflect and vertically focus the electron beam. At the nominal beam energy (3 GeV), the field and gradient along the magnet centerline are 1.3 T and 3.3 T/m (k = {minus}0.33 m{sup {minus}2}), respectively. Due to the straight core construction, the beam passes through each dipole with up to 16.6 mm trajectory offset relative to the centerline. This paper describes a method used to characterize the spilldown effect from magnetic multipole fields as observed by the beam traversing the dipole magnets. Results of tracking studies utilizing the longitudinal variation of multipole fields are discussed
Accelerating Research
Robert Robinson Avenue,
Oxford Science Park, Oxford
OX4 4GP, United Kingdom
Address
John Eccles HouseRobert Robinson Avenue,
Oxford Science Park, Oxford
OX4 4GP, United Kingdom