Neutral Particle Imager (NPI) Information
Last Updated: April 18, 2006 by
Sandee Jeffers
NPI
Document References:
General Information:
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Charged Particle Removal Grid Voltage: 0 V - 5 kV
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Grid Removal Operational Modes: 4 (on, off, alternative, sweeping)
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Number Azimuthal Sectors: 32
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Angular Resolution: 4.6 deg x 11.5 deg
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Time Resolution: 31.25 msec
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Energy Range: 0.1 keV - 60 keV
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Geometric Factor: 7.8 x 10-2 cm2 sr
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Geometric Factor per Sector: 2.5 x 10-3 cm2 sr
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Efficiency: ~1%
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Raw Bit Rate: 16 kbps
There are 4 Virtual Instruments for the Neutral Particle Imager:
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2 Science Data
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NPI Data of 32 sensors (azimuthal sectors) from the normal mode data packets, all scalars: 16 bits per sample, 32 samples per sec. (NPINORM, for NPI NORMal mode science data)
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NPI Data of from the normal mode data packets: same data as NPINORM but
organized as 1 sensor with 32 azimuthal bins; 16 bits per sample, 32 samples per sec. (NPINORMV, for NPI NORMal mode science data in Vector form)
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2 Engineering Data (Health & Safety, Monitors, Voltages)
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5 Engineering Monitor and Reference Values: 8 bits per sample, 0.25 samples per sec. (NPIENG8, for NPI ENGineering 8-bit values)
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12 Engineering Status Indicators: 1-4 bits per sample, 0.25 samples per sec. (NPIENGS, for NPI ENGineering Status indicators)