Neutral Particle Detector (NPD) Information
Last Updated: April 18, 2006 by
Sandee Jeffers
NPD
Document References:
General Information:
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Number of Detectors: 2 - NPD1 and NPD2
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Charged Particle Removal Grid Voltage: 0, 8 kV
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Grid Removal Operational Modes: 3 (on, off, switched)
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Number of Start MCPs: 2
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Number of Stop MCPs: 3
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Number of Directions: 3
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Number of Mass Steps: 16
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Number of Energy Steps: 16
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Raw Bit Rate: 64 kbps
There are 10 Virtual Instruments for the Neutral Particle Detector:
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10 Science Data - 5 each for NPD1 and NPD2
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NPD1:
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NPD1 Raw Science data mode of 4 sensors: 2 16-bit streams contain the TOF,
Direction, Coincidence, and Stop PH values (NPD1RAW, for NPD1 RAW data mode)
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NPD1 TOF Science mode of 3 directions (sensors), 16 PHD bins and 16 TOF bins:
16 bits per sample; 32 samples per sec. (NPD1TOF, for NPD1 TOF mode)
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NPD1 Science Bin Matrix mode data of 3 directions in 1 x 16 matrix:
16 bits per sample; 32 samples per sec. (based on 31.25 msec instrument cycle
time); 1 x 16 refers to mass (hydrogen/oxygen combined) x 16 TOF bins
(NPD1BM1, for NPD1 Bin Matrix 1 x 16 matrix mode science data)
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NPD1 Science Bin Matrix mode data of 3 directions in 2 x 16 matrix:
16 bits per sample; 32 samples per sec. (based on 31.25 msec instrument cycle
time); 2 x 16 refers to mass (hydrogen/oxygen separated) x 16 TOF bins
(NPD1BM2, for NPD1 Bin Matrix 2 x 16 matrix mode science data)
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NPD1 Science Bin Matrix mode data of 3 directions in 16 x 16 matrix:
16 bits per sample; 32 samples per sec. (based on 31.25 msec instrument cycle
time); 16 x 16 refers to 16 PHD bins x 16 TOF bins
(NPD1BM16, for NPD1 Bin Matrix 16 x 16 matrix mode science data)
NPD2:
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NPD2 Raw Science data mode of 4 sensors: 2 16-bit streams contain the TOF,
Direction, Coincidence, and Stop PH values (NPD2RAW, for NPD2 RAW data mode)
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NPD2 TOF Science mode of 3 directions (sensors), 16 PHD bins and 16 TOF bins:
16 bits per sample; 32 samples per sec. (NPD2TOF, for NPD2 TOF mode)
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NPD2 Science Bin Matrix mode data of 3 directions in 1 x 16 matrix:
16 bits per sample; 32 samples per sec. (based on 31.25 msec instrument cycle
time); 1 x 16 refers to mass (hydrogen/oxygen combined) x 16 TOF bins
(NPD2BM1, for NPD2 Bin Matrix 1 x 16 matrix mode science data)
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NPD2 Science Bin Matrix mode data of 3 directions in 2 x 16 matrix:
16 bits per sample; 32 samples per sec. (based on 31.25 msec instrument cycle
time); 2 x 16 refers to 2 masses (hydrogen/oxygen separated) x 16 TOF bins
(NPD2BM2, for NPD2 Bin Matrix 2 x 16 matrix mode science data)
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NPD2 Science Bin Matrix mode data of 3 directions in 16 x 16 matrix:
16 bits per sample; 32 samples per sec. (based on 31.25 msec instrument cycle
time); 16 x 16 refers to 16 PHD bins x 16 TOF bins
(NPD2BM16, for NPD2 Bin Matrix 16 x 16 matrix mode science data)
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3 Engineering Data (Health & Safety, Monitors, Voltages)
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18 8-bit Engineering Monitor and Reference values: 2 detectors with 9
monitor/reference values (bias, deflection, start bias, stop bias monitors
and references, plus temperature monitor) each (2 x 9 = 18); 8 bits per
sample (NPDENG8, for NPD ENGineering 8-bit data)
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13 NPD Status indicators: 11 1-bit values indicating on/off or disabled/enabled
states, 2 4-bit values indicating the 2 detector modes
(NPDENGS, for NPD ENGineering Status indicators)
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20 16-bit NPD data register values: 16 16-bit registers, 4 8-bit registers
(NPDENG16, for NPD ENGineering 16-bit registers)