摘要
The External Target Facility of CSRm[1??3],a magnetic spectrometer with a large angular and momentum acceptance,is a basic and critical device of the CSR experimental area.The device provides large opportunities for nuclear spectroscopic studies using high energy radioactive ion beams[4].A schematic view of the ETF is shown in Fig.1.To obtain an overall performance of the newly commissioned ETF,an 40Ar beam with an energy of 320 MeV/u has been used to test the detectors on ETF.The primary beam 40Ar was accelerated to 320 MeV/u by the synchrotron CSRm and then extracted and delivered to the entrance of ETF.A 5 mm thick carbon reaction target was mounted at the entrance of ETF.
