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Oscillations of the neutron into a hidden sector particle are processespredicted in various Standard Model extensions. This extra channel for neutrondisappearance has not been tested experimentally in large portions of theoscillation parameter space. Several efforts have been recently made onrevising the oscillation time limits at low mass-splitting in ultra-coldneutron (UCN) storage experiments, and at larger mass-splitting inpassing-through-wall experiments. In this work, we present the expectedsensitivity of an experiment searching for neutron hidden neutron oscillationsat intermediate mass-splitting via the application of magnetic fields in therange $B_0=30-1100$ $\mu$T. This experiment was performed at theInstitut-Laue-Langevin using a novel UCN counter to monitor the beam flux. Themeasured UCN rate and the data collection technique predict a sensitivity onthe oscillation time at the level of a couple of seconds.

$n-n'$ Oscillations: Sensitivity of a first UCN beam experiment