Halbach limit (solid), saturation effect (dotted), and field required for ILC DR (dashed).
On the top: magnetization contour plot in the vertical plane of symmetry in the pole for 32 mm gap in EyrPhI design (Ref. 13) (on the left) and the same for modified design with , partial PM overlapping and reduced iron yoke as shown on the bottom. The black color is related to the poles, the meshlike segmentation is related to the yoke.
Layout of -period, 1.64 T wiggler magnetic design for conventional, N38 grade NdFeB and 55.6 mm gap (on the left) and its one-quarter view of half a period.
Layout of two-period, 1.61 T wiggler magnetic design for 55.6 mm gap and N48 grade compact variant (the last line of Table I).
Schematic axonometric of one-quarter, half period of the wiggler design based on N48 grade magnets (the last line of the Table I). The meshlike segmentation is related to the pole, the arrows indicate magnetization direction of the PM blocks.
Design approach with triangular or trapezoidal shape of the poles.
Field amplitude (on the left) and particle deflection (on the right) for 55.6 mm gap low-grade PM design (second line from the bottom of Table I). Particle energy is 5 GeV under trivial initial conditions.
Three shims (or two grooves in the pole) on the pole surface introduced for field correction in the 55.6 mm gap designs. The Permendur shims are three thin strips on the flat pole surface and have the same thickness. The straight line indicates the axis (or the beam).
Wiggler field horizontal profile for 1.64 T, 55.6 mm gap, three shims N38 grade variant (see the second line from the bottom of Table I). The inset shows the field in the good field region .
Wiggler field horizontal profile for 1.61 T, 55.6 mm gap, three shims, N48 grade variant of Fig. 4 (see the last line of Table I). The inset shows the field in the good field region .
Multipole field components along the hybrid design including matching cells for the N38 grade, 55.6 mm gap variant. On the left: horizontal, on the right: vertical.
Fields for different gaps, materials, and different trial PM-based hybrid design modifications.
Multipole moments from quadrupole to dodecapole and its integrals for (horizontal) and (vertical) areas along the —period symmetrical model.
Estimation of partial dynamic apertures (m) caused by higher order multipole components.
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