photo of dipole[gif 99K][jpeg 28K] These are high quality 45° dipoles developed for the UCSB 6 MV beam switchyard. Rotatable ends pieces generate a variable quadrupole element.
field profile

This is a differential measurement of By showing that a field uniformity of better than 0.01 % over 3 cm was achieved. [gif 2K]

plot of field lines[gif 14K] This is a cross-sectional plot of magnetic field lines (equipotentials of vector potential) showing how pole faces were shaped to achieve high field uniformity.
end field clamps

This is a plot of field lines at the end of the dipole showing method by which end fringe fields are terminated. This results in a near linear field termination over one gap length. This is important in minimizing beam aberations. [gif 4K]