Ghost-rays characterization for the FOXSI-3 sounding rocket launch

The Focusing Optics X-ray Solar Imager (FOXSI) sounding rocket payload achieved its third successful flight on September 7, 2018. FOXSI uses glancing-incidence Wolter-I mirrors combined with fine-pitch Si and CdTe detectors to perform direct solar Hard X-Ray (HXR) imaging spectroscopy. For FOXSI’s latest flight, several upgrades were made to the instrument, including updating the optics and detectors as well as adding new honeycomb type collimators to reduce Ghost rays background. We provide an overview of these updates as well as a discussion of their measured performance.