Title :
A Study of a 90° Bending Magnet for H- Beams
Author :
Sherman, J.D. ; Allison, Paul W.
Author_Institution :
Los Alamos Scientific Laboratory, Los Alamos, NM 87545
fDate :
6/1/1979 12:00:00 AM
Abstract :
Three different magnetic pole face configurations with field indices ¿ 0 have been studied to minimize second-order magnetic focusing aberrations. One pole face with a substantial second-order magnetic field inhomogeneity (ß = 1.14) reduces the measured A1 = ¿2¿f/(¿¿f¿yf) aberration coefficient to zero. A calculation using first- and second-order ion optics provides a qualitative explanation for the aberration variations seen in these magnets. The pepper pot emittance measurement technique was used; although these measurements are sensitive to the A1 term, they are not very sensitive to the A2 = ¿2¿f/(¿xf¿yf) contribution.
Keywords :
Assembly; Coils; Data mining; Geometry; Ion beams; Ion sources; Magnetic field measurement; Magnetic fields; Shape measurement; Uncertainty;
Journal_Title :
Nuclear Science, IEEE Transactions on
DOI :
10.1109/TNS.1979.4330648
