1SWEA pre-CDR Peer Review

Particles and Fields Package (PFP)SWEA pre-CDR Peer Review

Integration and Test

2011 March 29

Dave Mitchell

2SWEA pre-CDR Peer Review

IRAP / UCB-SSL Collaboration

IRAP, Toulouse• Analyzer• MCP• Anode• HVPS

SSL, Berkeley• Pedestal• Digital / FPGA• LVPS

(same as for STEREO SWEA)

3SWEA pre-CDR Peer Review

PFP I&T Flow

FSW Acceptance Test

PFDPU Board Functionals

MAG CPT MAG Cal

PFDPU CPT

SEP CPT SEP Cal

LPW Preamp Functional

LPW Preamp Thermal Vac

LPW Boom Deployment Tests

LPW Boom I&T

EUV Cal

LPW BEB, DCB Functional

LPW Cal

LPW CPT

PFP Baseline CPT

STATIC CPT STATIC Cal

PFP Self Compatibility

PFP PER

SWIA CPT SWIA Cal

SWEA Analyzer Functional

SWEA Analyzer Cal

SWEA Dig, LPVS Functional

SWEA CPT SWEA Cal

MAG Board Functionals

SEP Subassembly Functionals

STATIC Subassembly Functionals

SWIA Subassembly Functionals

SWEA Subassembly

Functional

EUV Subassembly Functionals

MAG Sensor Vib

4SWEA pre-CDR Peer Review

SSL Integration and Test Facilities

One of 5 Thermal Vac chambers at SSL

Cleanroom (with 5 THEMIS probes)

Magnetics Screening Station One of 3 calibration chambers at SSL

5SWEA pre-CDR Peer Review

SWEA Verification

• PFP Verification Plan MAVEN_PF_SYS_023• PFP Verification Matrix MAVEN_PF_SYS_033• Maps requirements to verification tests

– FRD, ERD, ICD Requirements• Most SWEA Performance Requirements in the FRD

verified during SWEA Instrument Calibrations• ERD requirements verified during Environmental Tests

ID Title Revision D+, CCR-0265 Links from above Verification Level

Verification Method

Verification Description

PF65 SWEA Flux Range SWEA shall measure energy fluxes from 1E4 to 1E8 eV/cm2-sec-ster-eV with no worse than 25% precision

MRD52 SWEA Test SWEA Calibrations as called out in the PFP Verification Plan, MAVEN_PF_SYS_023

PF66 SWEA Sensitivity SWEA shall have a geometric factor > 0.005 cm2-ster

MRD53 SWEA Test SWEA Calibrations as called out in the PFP Verification Plan, MAVEN_PF_SYS_023

PF67 SWEA Energy Range SWEA shall measure electrons from 10 - 1000eV

MRD58 SWEA Test SWEA Calibrations as called out in the PFP Verification Plan, MAVEN_PF_SYS_023

PF68 SWEA Energy Resolution SWEA shall have energy resolution dE/E of at least 25%

MRD59 SWEA Test SWEA Calibrations as called out in the PFP Verification Plan, MAVEN_PF_SYS_023

PF69 SWEA Time Resolution SWEA shall have time resolution of at least 20 seconds or better

MRD60 SWEA Test SWEA Calibrations as called out in the PFP Verification Plan, MAVEN_PF_SYS_023

PF70 SWEA Angular Resolution SWEA shall have angular resolution of at least 45 degrees

MRD60 SWEA Test SWEA Calibrations as called out in the PFP Verification Plan, MAVEN_PF_SYS_023

PF71 SWEA FOV SWEA shall have a FOV which covers at least 50% of the sky

MRD61 SWEA Test SWEA Calibrations as called out in the PFP Verification Plan, MAVEN_PF_SYS_023

6SWEA pre-CDR Peer Review

SWEA I&T Plans at SSL

• SWEA Sensor delivered to SSL ~12/2012– Will have been calibrated at IRAP– Includes verification of instrument sensitivity (PF66), flux range

(PF65), energy range and resolution (PF67, PF68), angular resolution (PF70), and FOV (PF71).

• SWEA Integrated with SSL electronics– Interface verifications– Comprehensive Functional Test (CPT)

• Uses internal test pulsers outside of vacuum chamber• Verify all possible modes of operation• Verify all instrument commands

– Chamber tests to verify no change in performance, sweeping modes, data products

7SWEA pre-CDR Peer Review

SWEA System-Level Testing

End-to-end testing in vacuum chamber from front-end analyzer optics, to digital electronics, to data products

• Calibration utilizes a GSE that controls the instrument, and the electron source, the 3-axis manipulator, and records the data

• Verify analyzer, deflector, and V0 voltage sweeping modes– Provides verification of time resolution (PF69)– Verify sufficient precision and stability for “ionosphere mode”

• Test energy and angular response to check that instrument response matches expectations from IRAP calibrations and simulation– Verify uniform energy/angle response– Check hemisphere concentricity– Determine relative anode/MCP sensitivity

• Verify data products

8SWEA pre-CDR Peer Review

In-Flight Calibration (PF107)

• Pre-launch: SWEA must have the right dynamic range to handle expected flux range at Mars (10 years of experience with MGS ER)– Need to know GF to a factor of ~2: pre-launch calibrations and simulations

easily provide this

• Primary Method: LPW measures plasma frequency in the sheath to determine absolute plasma density – compare with SWEA, SWIA, STATIC

• Secondary Method: STATIC MCP efficiencies can be determined in flight by comparing START and STOP events – combine with well known mechanical geometric factor to determine absolute sensitivity – cross calibrate with SWEA in sheath

• Cross Check: STATIC cross calibrated with NGIMS by measuring periapsis RAM ions – cross calibrate with SWEA in sheath