Dipole - Quad - Quad
The lefthand magnet (HT605) is a small dipole, probably for small adjustments to beam direction. The other two are quadrupoles, the main workhorses of magnetic optics, which focus the beam in one transverse direction while defocusing it in the other. These two quads are rotated 45 degrees with respect to one another, so one of them (the rightmost one, I think) is a special-purpose "skew quad", used for making corrections to the optics (correcting for x-y coupling?).
Dipole - Quad - Quad
The lefthand magnet (HT605) is a small dipole, probably for small adjustments to beam direction. The other two are quadrupoles, the main workhorses of magnetic optics, which focus the beam in one transverse direction while defocusing it in the other. These two quads are rotated 45 degrees with respect to one another, so one of them (the rightmost one, I think) is a special-purpose "skew quad", used for making corrections to the optics (correcting for x-y coupling?).