A test beam upgrade based on the BEPC-LINAC

A total of three beam lines, E1, E2 and E3 have based on the LINAC of BEPC. The El beam is to be used for intense slow-positron facility. The E2 is a primary positron or electron beam with an energy of 1.3-1.5GeV. The E3 is a secondary electron or pion test beam with a momentum can be adjustable continuously. The position accuracy of a detected particle is 0.2-0.4mm with an event rate of 3-4Hz. This beam has been successfully used for some detectors beam test.