Magnetic Field Shielding For the Forward Time of Flight Upgrade At Jefferson National Lab

The University of South Carolina has been tasked with the construction of the counters for the Forward Time of Flight detector during Jefferson Lab\u27s 12GeV upgrade. The counters, consisting of photomultiplier tubes attached to the ends of scintillation bars of varying lengths, record the time of flight for particles inside the Continuous Electron Beam Accelerator Facility (CEBAF) Large Acceptance Spectrometer (CLAS). These detectors must be properly shielded from magnetic fields used in the manipulation of the particle trajectories during experiments. Dr. Gothe\u27s nuclear physics group has been experimenting with various types of magnetic shielding methods using a Helmholtz Coil to provide varying field strengths. Photomultiplier tubes with magnetic shielding built in supply the necessary shielding for the strengths expected at Jefferson Lab, though there are still other options available if need be