A new time-of-flight neutron spectrometer (TOFOR) has been developed to measure the 2.45MeV d + d Æ 3He + n neutron emission from D plasmas. The TOFOR design features the capability to operate at high rates in the 100kHz range, data collection with fast time digitizing and storing, and monitoring of the signals from the scintillation detectors used. The paper describes the principles of the instrument and its installation at JET, and presents preliminary data to illustrate the TOFOR performance as a neutron emission spectroscopy diagnostic.