TOF measurement in RIBLL

In this paper we present a timing pickup detector used at Radioactive Ion B eam Line in Lanzhou (RIBLL). It has low detection threshold and is radiatio n-resistant The photons induced by radioactive beam ions passing through a thin plastic-scintillator foil, emit from the foil center corresponding to one focus point of a aluminum ellipsoidal mirror and are reflected to anoth er focus point at which the cathode of a photomultiplier tube locates. The readout pulse signals were sent into a CAMAC' s TDC module. A time resoluti on of about 140ps is achieved and the counting rate up to 10(8)pps is allow ed.