Fundamental Technologies Voyager LECP Pages

Voyager LECP Data Analysis Handbook

List of Figures

Instrument and Investigation Descriptions and Images

• Image of the Voyager Spacecraft

Engineering Design

• Detector Tests at Teledyne-Isotopes Using the Pioneer F-08 RTG:
  • Figure 1. Counting rate vs. distance, 100 micron detector
  • Figure 2. Rough energy spectrum obtained at a distance of 26 cm
  • Figure 3. Same as figure 1, for 200 micron detector
  • Figure 4. Differential and integral energy spectrum for 200 micron detector
  • Figure 5. Differential and integral energy spectrum for 100 micron detector
• Charged Particle Telescope diagram
• High Intensity Detector System for the Study of the Magnetospheres of Outer Planets:
  • Trapped particle detector diagrams (2 figures)

Data File Descriptions

• EDR
  • MJS Engineering Telemetry Format Structure
• SEDR
  • SEDR File (Tape) Layout
  • Earth Mean Ecliptic and Equinox of 1950.0 (ECL50), Launch SEDR State Vectors
  • Earth Mean Ecliptic and Equinox of 1950.0 (ECL50), Cruise SEDR State Vectors
  • Earth Mean Ecliptic and Equinox of 1950.0 (ECL50), Jupiter Encounter State Vectors
  • Earth Mean Ecliptic and Equinox of 1950.0 (ECL50), Saturn Encounter State Vectors

Calibrations and Channel Definitions

• Delta Detector Characteristics
  • Results of Dead-Layer Test on the Spare β Detector
  • Beam Calibration for Delta Detector
• LEPT Logic and PHA Design
  • Figure 1. Channels in the 5-150 micron combination for the coincidence condition (1 2 3).
  • Figure 2. Channels in the 2-150 micron combination for the coincidence condition (0 2 3).
  • Figure 3. Channels in the 150-2500 micron combination for the coincidence condition (2 3 4).
  • Figure 4. Channels in the 100-2500 micron combination for the coincidence condition (5 4 3).
  • Figure 5. Channels in the 100-2500 micron combination for the coincidence condition (5 4 3 2) and 5 4 3 2.
  • Figure 6. Channels in the 2500-2500 micron combination for the coincidence condition (5 4 3 2) and 5 4 3 2.
• Time Constants for V1 LECP
  • LECP SN02 Alpha1-1 Disc Output
  • LECP SN02 Beta-1 Disc Output
  • A0, A1, A2 Outputs
  • LECP SN02 D1-D2 Coin. Strobe
• The Voyager LECP Pulse Height Analyzer (PHA)
  • Block diagram of Pulse Height Analyzer for MJS-77 LECP Experiment
  • LECP Pulse Height Analyzer data timing diagram
  • Simplified peak detector block diagram; typical timing for peak pulse measurement
  • Detailed circuit timing of LECP PHA A/D converter
  • PHA basic error block diagram
  • Schematic PHA 1520
  • Schematic PHA 1530
  • Schematic PHA 1540
  • Schematic PHA 1550
  • Schematic PHA 1560
  • Schematic PHA 1570
  • Internal Power Switches for LECP PHA system
  • PHA test set - timing and control, data display
  • PHA test set - digital servo control loop
  • PHA test set timing diagram
  • MJS-PHA test set data store, error sense and BCD conversion
  • PHA test set display and control logic
  • PHA test - miscellaneous schematics
  • PHA test set - panel detail
• Specification - LECP Pulse Height Analyzer
  • LECP Pulse Height Analyzer Block Diagram
  • LECP-PHA Timing
  • LECP PHA Sequencer Timing
  • LECP Digital Interface Circuits
• Rate Tests
  • D1a-D2 Coincidence
  • D1b-D2 Coincidence
  • D1c-D2 Coincidence
  • D2 Rate Test
  • D3 Rate Test
  • D4 Rate Test
• Random Pulser Test
  • SN02
  • Feb. 5, 1979, LECP SNO2, D1D2 Coincidence Strobe. Output Rate vs. Input Rate, Random Pulser Inputs ~1 MeV into Channels D1 and D2 (Rate Channel 3).
  • α Channel
  • β and β' Channels
  • Channel A

Instrument Modeling Reports

• An Analysis of the Performance of the Magnetic Deflection System in the Voyager Low Energy Charged Particle Experiment (S. Shodhan master's thesis)
  • Voyager spacecraft and scientific instruments
  • A picture of the first flight unit of the LECP experiment
  • Magnet configuration
  • Projection of the magnets on the yz plane showing the rotated and the translated coordinate systems centered at each of the magnets
  • Schematic drawing of the LEMPA and dome detector assembly
  • Modeled sensor assembly for the LEMPA subsystem
  • Projection of the modeled sensor assembly on the xy plane
  • Projection of the modeled sensor assembly on the zy plane
  • Projection of the beta housing on the yz plane
  • Projection of the gamma housing on the yz plane
  • The detector surface divided into several sampling areas
  • Variation of the geometric factors with energy for the Gamma detector
  • Variation of the geometric factors with energy for the Beta detector
  • Points on the Gamma detector which are the initial points of the trajectories
  • Points on the Beta detector which are the initial points of the trajectories
  • Particle trajectories emanating from the point (-0.537177, -0.570312, 0.0) of the Gamma detector
  • Particle trajectories emanating from the point (-0.718812, -0.09375, 0.0) of the Beta detector
  • Angular distribution for energy E=720 keV
  • Angular distribution for energy E=1440 keV
  • Angular distribution for energy E=2880 keV
  • Angular distribution for energy E=80 keV
  • Angular distribution for energy E=320 keV
  • Angular distribution for energy E=480 keV
  • Angular distribution for energy E=320 keV
  • Angular distribution for energy E=320 keV
  • Points on the Beta detector which sample the area
  • Projection of the field lines on the xz plane at y=04698 in.
  • Projection of the field lines on the zy plane at x=0.0 in.
  • Results of the observed and the calculated values of the magnetic field
• LEMPA Aperture Notes and Drawings
  • LEMPA Telescope Assembly, detail from APL drawing 1D0600
  • Configuration for Brazing, excerpt from APL drawing 1D0610
  • β-γ Radiation Shields (excerpts from APL drawing 1D0612)
  • LEMPA Field Control Cone (excerpt from APL drawing 1C0601)
  • LEMPA Aperture Axial View (excerpt from APL drawing 1D0600)
  • Sketch of the View Looking into the LEMPA Cone of the Backup Instrument
  • LEMPA Magnetic Yoke, Sketch 1
  • LEMPA Magnetic Yoke, Sketch 2

In-Flight Calibration Studies

• Study of Voyager 2 LECP Responses in Partial Exposure ("Chicken") Mode
  • 32 plots

Analyzed Observations

• Voyager Saturn Figures
  • Counts/Second Plots (27 figures)
  • Phase Space Density Plots (57 figures)
• Voyager Saturn Studies (15 figures)

Saturn Operations

• LECP Stepping During Saturn Encounter by Voyager 1 (6 figures)

Return to Voyager LECP Data Analysis Handbook Table of Contents.
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Last modified 8/26/05, Tizby Hunt-Ward
tizby@ftecs.com