Estimating the Performance of Neutron Time-of-flight SpectrometersAnalogy with optical instruments is used to develop formulas for estimating the counting rate achieved by a neutron time-of-flight system. lnput data consist of the flux at the spectrometer entrance and some of the physical characteristics of the spectrometer. Convenient relations for the comparison of different systems are presented. |
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aperture at spectrometer Area of aperture becomes R(T channel at reciprocal chopper is open Chopper Pulsed Chopper with steady-state chopper-pulsed-source system chopperless pulsed source corresponding to reciprocal counting rate achieved current density cutoff function energy Ec energy region entering test assembly entrance and exit entrance aperture equation estimating the counting exit aperture extended energy interval function and detector given by Eq given by RC(T mechanical chopper MECHANICAL CHOPPING necessary to apply neutron flux neutron source neutron spectrometer NEUTRON TIME-OF-FLIGHT SPECTROMETERS Number of bursts number of counts Number of slits open at once PERFORMANCE OF NEUTRON pulsed assembly pulsed-source Q₂ R₁(T R₂(T rate per channel rate per unit rotor slit second entering test slits are open sometimes necessary source or test specific area spectrometer entrance spectrometer run spectrometer source SPECTROMETERS by George spectrum speed at reciprocal steady-state source steradian time-of-flight system Total number total running unit energy unit reciprocal speed