A plastic scintillating fiber position detector in vacuum for the test beam facility at BEPC II -LINAC

Two plastic scintillating fiber position detectors for charged particles have been designed, built and installed inside the vacuum tube near two sides of the DM2 deflection magnet on the E3 beam line of the test beam facility at the BEPC-LINAC. A one-dimensional position resolution of similar to 1 mm with a sensitive area of 60 mm x60 mm has been obtained for this detector.