Rate Acceptance and Timing Performance of a Time-of-Flight Detector for Isochronous Mass Measurements in the CR

Isochronous Mass Spectrometry (IMS) in the ESR has successfully applied recently [1]. At FAIR, IMS will be performed in the Collector Ring (CR) in combination with the Super-FRS and thus substantially extend the reach of mass measurements to more exotic ions. In IMS the masses of the nuclei are directly determined from the revolution frequencies measured by a microchannel plate (MCP) time-of-flight detector. In the detector, ions passing a thin carbon foil release secondary electrons (SE), which are transported to microchannel plates by electric and magnetic fields [2]. The detector for the CR is currently under development; it is based on the IMS detector in the ESR.