Tagential winding coil probes for dipole, quadrupole and sextupole magnet measurements

The number of coils for a rotating coil probe of ``tangential winding geometry depends on the requirements of the magnet measurements. In order to measure the main field, multipole coefficients and the location of the magnetic center axis, two sets of coils are sufficient for a rotating coil probe of ``radial winding geometry.`` A probe of tangential winding geometry, on the other hand, requires more than two sets of coils to measure the above field parameters. This note describes probes of tangential winding geometry with a minimum number of coils for dipole, quadrupole and sextupole magnet measurements