2.0.0 spase://SMWG/Instrument/AE-E/BIMS Bennett Ion-Mass Spectrometer (BIMS) BIMS 2019-05-05T12:34:56Z This experiment was flown to measure, throughout the orbit, the individual concentrations of all thermal ion species in the mass range 1 to 72 atomic mass units (u) and in the ambient density range from 5 to 5.E6 ions/cc. The mass range was normally scanned in 1.7 s, but the scan time per range could be increased by command. Laboratory and inflight determination of spectrometer efficiency and mass discrimination permitted direct conversion of measured ion currents to ambient concentrations. Correlation of these measured data with the results from companion experiments, CEP (75-107A-01) and RPA (75-107A-04) permitted individual ion concentrations to be determined with high accuracy. The experiment's four primary mechanical components were guard ring and ion-analyzer tube, collector and preamplifier assembly, vent, and main electronics housing. A three-stage Bennett tube with 7- to 5-cycle drift spaces was flown; it was modified to permit ion concentration measurements to be obtained at low altitudes. The balance between ion-current sensitivity and mass resolution in a Bennett spectrometer may be altered by changing appropriate voltages. These voltage changes were controlled independently by ground command for each one of the three mass ranges: 1 to 4, 2 to 18, and 8 to 72. More complete experiment details can be found in H. C. Brinton et al., Radio Sci., v. 8, n. 4, p. 369, 1973. spase://SMWG/Person/Henry.C.Brinton PrincipalInvestigator NSSDC's Master Catalog https://nssdc.gsfc.nasa.gov/nmc/experiment/display.action?id=1973-101A-11 Information about the Bennett Ion-Mass Spectrometer (BIMS) experiment on the AE-E mission. Radio Science Journal Article https://onlinelibrary.wiley.com/doi/abs/10.1029/RS008i004p00323 Detailed information about the Bennett Ion-Mass Spectrometer (BIMS) on the AE-E mission. MassSpectrometer Bennett Ion-Mass Spectrometer (BIMS) on AE-E spase://SMWG/Observatory/AE-E