Cross-field electron transport through a rotating spoke in the cylindrical hall thruster

Summary form only given. A rotating spoke has been observed on a cylindrical Hall thruster with a cusp-shaped magnetic field. The spoke rotates with a velocity near 2 km/s in the ExB direction. The crossfield electron transport induced by the spoke has been directly measured for the first time using a segmented anode. Approximately 50% of the total current is found to pass through the spoke. The cross-field transport mechanism has been explored using emissive probe measurements of the fluctuating potential. The findings reveal a perturbed electric field which enhances electron transport across the field.