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SPP FIELDS Updated block diagrams Fault Tolerant Design. Fault Tolerance Requirement.

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SPP FIELDS

Updated block diagrams

Fault Tolerant Design


Fault tolerance requirement
Fault Tolerance Requirement

  • “Solar Probe Plus will achieve mission success at the end of prime mission by returning no less than 64 Gb of science data composed of at least 7 out of 9 of the required measurements (4.1.2.3 -4.1.2.11) collected during 150 hours below 20 Rs, including no less than 5 hours below 10 Rs. “

  • Since FIELDS measurements represent 4 of the 9, any single point failure in FIELDS is a mission critical failure.

FIELDS threshold mission science measurements:


Fields fault tolerant design
FIELDS fault tolerant design

“Sys-6”, TDS serves double duty, serves as DCB for Side 2


Capabilities retained
Capabilities retained

  • Side 1 failure, Side 2 carries on FIELDS operations

    • Inboard MAG

      • Produces magnetic field vectors, 3 axes, up to 293 Sa/s

    • TDS

      • Can deliver DC electric field vectors, DC to 1MSa/s, one axis (V3,V4)

      • Can deliver electric field spectra, up to 1MHz BW, one axis (V3,V4)

      • Requires some re-programming of TDS function

    • Total loss:

      • SCM

      • QTN and Radio Emissions

  • Side 2 failure, Side 1 carries on FIELDS operations

    • Outboard MAG

      • Produces magnetic field vectors, 3 axes, up to 293 Sa/s

    • DFB

      • Produces electric field vectors and spectra, DC to 150 kSa/s, two axes (V1,V2) and V5

      • Produces SCM vectors and spectra, DC to 150kSa/s, 3 axes

    • RFS/DCB

      • Produces QTN spectra, 10kHz to 2.5MHz BW

      • Produces Radio Emission spectra, 1MHz to ~19MHz BW

    • Total loss:

      • TDS


Block Diagram

Jun 4, 2013


Mep stack up
MEP Stack Up

  • Side 1

    • LNPS1

    • MAGo (Outboard)

    • DCB/RFS

    • AEB1

    • DFB

  • Side 2

    • LNPS2

    • MAGi (Inboard)

    • TDS

    • AEB2

  • Each slice is bolted to S/C Panel





Level 3 requirement clarification
Level 3 Requirement - Clarification

  • Current L3 max field intensity: 5V/m at 20kHz

    • Applied to V5 measurements implies signals that are 10s Volts amplitude

    • Not met with current design of V5 preamp

    • Should we clarify this requirement as N/A for Eparallel?

Current Level 3 Requirement for EFI…


Scm noise floor question
SCM noise floor question

  • A request from DFB to SCM team:

    • “recommended that the sensitivity of the complete SCM including Preamp be verified before moving forward on the DFB design.”

    • Meeting SCM noise floor L3 requirement would more power

    • L3 requirement is 10X the published SCM noise floor

  • Noise floor analysis of SCM preamp, based on

    • LT1352 preamp LF output stage, noise referred to its input: 14nV/sqrt(Hz) Indicated gain implies ~450nV/sqrt(Hz) at the output

    • SCM-LF noise floor (at 3kHz): 1E-5 nT/sqrt(Hz) converts to 26nV/sqrt(Hz)

      • Assuming conversion factor of 2.6mV/nT


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