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					    Science Acquisition
        Spin Detail




1
          Telemetry Summary – IBEX-Hi


    Normal Mode Histogram (every 12 min):
    – 60 azim bins (60 bins)
    – 16 coincidence types + 3 singles (A, B, C)
    – 6 energies
    Channel D Histogram (every 12 min)
    – 15 azim bins (240 bins)
    Direct Event Data (800 events)
    – spin number
    – azimuthal angle
    – coincidence type (16 types)

2
                IBEX-Hi Coincidences


    •   Short: AB, AC, BC
    •   Long: AB, AC, BC, BA, CB, CA
    •   Triple (short): ABC
    •   Triples w/ 2 short: AB/C, BC/A, AC/B
    •   Triples w/ 2 long: A/BC, B/AC, C/AB




3
                                                   IBEX-Hi G-Factor



         Collimator Suppression      Conversion foil                                                     ESA
Energy Transmission    grid         Grid      Positive         Outer Inner E-FW b) E-HW      E0           E+HW       E+FW b) EFWHM EFWHM/E0 Throughput Throughput
 step          f)
                     transmission c)       charge state
                                Transmission
                                                          a)
                                                                (kV)    (kV) (keV) (keV)   (keV)          (keV)       (keV)   (keV)                  g)
                                                                                                                                                              FWHM h)
   1         0.694        0.95       0.70      0.025           -0.10   -0.74 0.21 0.31      0.45           0.59        0.69    0.22    0.480       0.134       0.221
   2         0.694        0.95       0.70      0.046           -0.07   -1.07 0.32 0.49      0.69           0.90        1.05    0.34    0.496       0.161       0.247
   3         0.694        0.95       0.70      0.067           -0.02   -1.58 0.51 0.76      1.06           1.41        1.62    0.59    0.557       0.191       0.266
   4         0.694        0.95       0.70      0.075            0.00   -2.55 0.76 1.16      1.62           2.20        2.54    0.97    0.594       0.236       0.356
   5         0.694        0.95       0.70      0.087            0.00   -4.19 1.16 1.79      2.52           3.56        4.07    1.67    0.663       0.291       0.413
   6         0.694        0.95       0.70      0.108            0.00   -7.00 1.78 2.86      4.02           5.90        6.74    2.89    0.719       0.351       0.495



a) Funsten et al.(2001); incident E is E 0 of the energy step
b) At ~ 1% level
c) 20 lpi nominal 0.95
d) Assuming CEM electron detection efficiency = 70% at 3 keV
e) =            1.17E-02 sr        ACF =               155.6 cm
                                                                 2

f) Loss of field-of-view due to edges and spokes not included (~6.5 + 1.9 %)
g) Throughput is the number of transmitted ions across the full range of the ESA energy bandpass step divided by the number of incident ENAs in that energy range, kF=22 k
h) Throughput FWHM is the transmitted ions across the FWHM of the ESA energy bandpass divided by the number of incident ENAs in the FWHM bandpass, kF=22 keV de




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posted:12/26/2011
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