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We present a permanent magnet arrangement that can achieve a tuneable axialmagnetic field from 1.80(8)-2.67(2) kG along the z-axis, where (x,y) = (0,0),with a rms field variation of less than 1% over a length of 25 mm. Theinstrument consists of an arrangement of off-the-shelf N42 neodymium-iron-boron(NdFeB) axially magnetized ring magnets, of varying outer and inner diameters.The magnets are organized into four cylindrical brass holders, whose relativeseparation can be manipulated to achieve the desired magnetic field strengthand homogeneity over the region of interest. We present magnetic fieldcomputations and Marquardt-Levenberg fits to experimental data and demonstrateexcellent agreement between theory and experiment. The apparatus has beendesigned to accommodate a cylindrical atomic vapor cell of length 25 mm anddiameter 25 mm to lie within the bore of the ring magnets. The design has aclear aperture of 20 mm in the x-y plane along the z-axis, which opens up newavenues for imaging exploration in atomic spectroscopy.

Tuneable homogeneous kG magnetic field production using permanent magnets