Exploration of error fields and correction methods in the MUSE permanent magnet stellarator

MUSE is a tabletop, permanent magnet stellarator currently being developed at PPPL that aims to create a quasi-axisymmetric magnetic field using simple coils. We explore methods to address deviations from the desired magnetic field of MUSE which may arise due to imperfections in assembly and material components. The primary method being explored is to correct the error fields by adjusting the position of the permanent magnet holders. To accomplish this, the FICUS and FIELDLINES codes are being used to generate a library of magnetic field deviations caused by modeled construction deviations. Once MUSE is constructed, the magnetic field will be mapped with an electron beam and compared to this library, and adjustments will be made to reduce the error fields. A secondary method that is being explored is to correct the error fields with trim coils. Multiple trim coil designs will be compared, and their efficacy in suppressing error fields for MUSE will be evaluated. We present a collection of possible construction deviations and their effects in addition to a perspective on the most effective correction techniques.