A method for constructing a nuclear magnetic resonance, NMR, sensor, the method comprising: selecting a material to construct a drill collar based on a cost and a minimum thickness for a cross sectional area of the material that satisfies a structural constraint; determining an interior volume for the drill collar to house one or more drilling components based at least in part on the minimum thickness for the cross-sectional area of the material; determining dimensions for components of the NMR sensor based on the minimum thickness and a magnetic field requirement, the components including a magnet assembly comprising a central magnet, a booster magnetic element, and first and second end magnets (310, 315), the magnet assembly being configured to generate a static magnetic field for NMR measurements; disposing the central magnet coupled to the booster magnetic element in the interior volume, the central magnet substantially surrounds the booster magnetic element; the booster magnetic element extends outward from a first end of the central magnetic element to form a first axial side and from a second end of the..... central magnet to form a second axial side, opposite the first axial side; and the booster magnetic element increases or extends the cross-sectional area of the magnet assembly to increase the strength of the static magnetic field produced by the magnet assembly (B 0); and positioning an antenna assembly proximate to the interior volume between the first axial side and the second axial side and about at least a portion of the central magnet; positioning the first end magnet in the interior volume proximate the first axial side of the booster magnetic element; positioning the second end magnet in the interior volume proximate the second axial side of the booster magnetic element. selecting a material to construct a drill collar based on a cost and a minimum thickness for a cross sectional area of the material that satisfies a structural constraint; determining an interior volume for the drill collar to house one or more drilling components based at least in part on the minimum thickness for the cross-sectional area of the material; determining dimensions for components of the NMR sensor based on the minimum thickness and a magnetic field requirement, the components including a magnet assembly comprising a central magnet, a booster magnetic element, and first and second end magnets (310, 315), the magnet assembly being configured to generate a static magnetic field for NMR measurements; disposing the central magnet coupled to the booster magnetic element in the interior volume, the central magnet substantially surrounds the booster magnetic element; the booster magnetic element extends outward from a first end of the central magnetic element to form a first axial side and from a second end of the..... central magnet to form a second axial side, opposite the first axial side; and the booster magnetic element increases or extends the cross-sectional area of the magnet assembly to increase the strength of the static magnetic field produced by the magnet assembly (B 0); and the central magnet substantially surrounds the booster magnetic element; the booster magnetic element extends outward from a first end of the central magnetic element to form a first axial side and from a second end of the..... central magnet to form a second axial side, opposite the first axial side; and the booster magnetic element increases or extends the cross-sectional area of the magnet assembly to increase the strength of the static magnetic field produced by the magnet assembly (B 0); and positioning an antenna assembly proximate to the interior volume between the first axial side and the second axial side and about at least a portion of the central magnet; positioning the first end magnet in the interior volume proximate the first axial side of the booster magnetic element; positioning the second end magnet in the interior volume proximate the second axial side of the booster magnetic element.