Measuring the Neutron Magnetic Form Factor to High-$Q^2$ Using the Ratio Method and the New Super BigBite Spectrometer

Few measurements of the Neutron Magnetic Form Factor ($G^n_M$) exist at high-$Q^2$ and these have large systematic uncertainties. These uncertainties can be significantly reduced by using the Ratio Method in which a ratio of the quasi-elastic electron-neutron and electron-proton scattering from a deuterium target is used to extract $G^n_M$. The GMn experiment will use the Ratio Method to measure $G^n_M$ for a $Q^2$ of 3.5 to 13.5 $(GeV/c)^2$ with high precision. This experiment will be the first to use the new large-aperture spectrometer being built as part of the SBS program in Hall A at Jefferson Lab. The spectrometer will be used to vertically separate the protons and neutrons, which will then be detected by a new hadron calorimeter. The scattered neutrons and protons will be detected in coincidence with electrons scattered into the existing BigBite spectrometer. In this talk I will discuss the experiment and specifics of how we intend to minimize the systematic uncertainties.