IMA

• ASPERA-3 Proposal, Part I: Scientific and Technical Plan, ~865 kb, 50 pages
• IMA IDFS Design Document, coming soon...

• Energy Range: 1 eV/q - 40 keV/q
• Mass Range: 1 amu - 106 amu
• Number of Radial MCP Positions: 32
• Number of Anodes: 16
• Angular Resolution of Anodes: 22.5 deg
• Number of Polar Angles (Elevation Angles): 16
  (Directly Related to Energy Levels)
• Total Number Steps: 96
  (Either 32 or 96 returned -- 32 is subset of possible 96)
• Raw Bit Rate: 64 kbps
• Sampling Time: 120 ms
• Modes - Hardware operation is always the same except for the 32 or 96 energy level step modes. Data reduction is performed since the experiment produces too much data to be transmitted. There are five groups of Data Modes:
  1. Minimum Modes (Min) = 3
     • Minimum spectra only (Mspo) - 15 max. sets of 2 masses with 32 energy levels each (2*32 values per set)
     • Minimum selected ion species (Msis) - 5 max. sets of 6 masses with 96 energy levels each (6*96 values per set)
     • Minimum energy-mass matrix (Mexm) - 5 max. sets of 32 mass-bins with 96 energy levels each (32*96 values per set)
  2. Normal Modes (Nrm) = 8 (Nrm-0 through Nrm-7)
     The energy deflection is stepped through all 96 steps for each of the 16 entrance steps.
  3. Burst High angular resolution Modes (Har) = 8 (Har-0 through Har-7)
     The energy deflection is stepped through all 96 steps for each of the 16 entrance steps.
  4. Burst Energy-mass matrix Modes (Exm) = 8 (Exm-0 through Exm-7)
     The energy deflection is stepped through all 96 steps for each of the 16 entrance steps.
  5. Special Modes = 4
     Typically used for ground testing and calibration, but may be used in orbit.
     • Test - H/W close information and Imager snapshot
     • Cal1 - HV information and one Imager in 16-bit uncompressed words
     • Cal2 - HV information and 96 Imagers (one per energy level) in compressed 8-bit words
     • Fake - Incremental (by one) 16-bit counter in 16-bit uncompressed words

• 7 Science Data
  1. 16 Sensors (1 for each anode/azimuthal angle) for Mass H+:
     96 energy steps max, 16 polar angles (elevation angles) max, 16 bits per sample (IMA_Hp, for IMA Hydrogen plus)
  2. 16 Sensors (1 for each anode/azimuthal angle) for Mass >O+:
     96 energy steps max, 16 polar angles (elevation angles) max, 16 bits per sample (IMA_GTOp, for IMA Greater Than Oxygen plus)
  3. 16 Sensors (1 for each anode/azimuthal angle) for Mass O+:
     96 energy steps max, 16 polar angles (elevation angles) max, 16 bits per sample (IMA_Op, for IMA Oxygen plus)
  4. 16 Sensors (1 for each anode/azimuthal angle) for Mass He+:
     96 energy steps max, 16 polar angles (elevation angles) max, 16 bits per sample (IMA_HEp, for IMA HElium plus)
  5. 16 Sensors (1 for each anode/azimuthal angle) for Mass He++:
     96 energy steps max, 16 polar angles (elevation angles) max, 16 bits per sample (IMA_HEpp, for IMA HElium plus plus)
  6. 16 Sensors (1 for each anode/azimuthal angle) for Mass O++:
     96 energy steps max, 16 polar angles (elevation angles) max, 16 bits per sample (IMA_Opp, for IMA Oxygen plus plus)
  7. 16 Sensors (1 for each anode/azimuthal angle) for all 32 Mass Levels:
     96 energy steps max, 16 polar angles (elevation angles) max, 16 bits per sample (IMA_MASS, for IMA all MASS levels)
  
  
• 3 Engineering Data (Health & Safety, Monitors, Voltages)
  1. 10 AD Monitors: 16 bits per sample, TBD samples per sec (IMA_ENG16, for IMA ENGineering 16-bit monitors)
  2. 8 Voltage and Temperature Monitors: 8 bits per sample, TBD samples per sec (IMA_ENG8, for IMA ENGineering 8-bit monitors)
  3. 18 Status Switches: 1 bit per sample, TBD samples per sec (IMA_ENGS, for IMA ENGineering Status switches)