Split-Pole PM Dipoles and Quadrupoles with Variable Field

Several possibilities to replace electromagnets on beam transport channels by permanent magnet (PM) lenses are considered. The main attention is concentrated on a design and features peculiar to dipoles and quad-rupoles with variable field in rather wide range of ad-justment. A PM dipole sample on Nd-FE-B alloy with 0.64 T at the center of the magnet and about 100 % field adjustment range is presented. It is shown that the alloy with 1.4 T coercivity and 1.0 T remanent field is able to give appropriate field uniformity (or linearity for quad-rupole lens). The design is considered as supplementary choice for transport line among tanks of high intensity driver of the ITEP “Neutron Generator ” [1].