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To design and commission a water phantom suitable for constrained environments and magnetic fields for magnetic resonance (MR)-guided proton therapy. A phantom was designed, to enable precise, remote controlled detector positioning in water within the constrained environment of a magnet for MR-guided proton therapy. The phantom consists of a PMMA enclosure whose outer dimensions of 81 × 40 × 12.5 cm 3 were chosen to optimize space usage inside the 13.5-cm bore gap of the magnet. The moving mechanism is based on a low-height H-shaped non-