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ide ield mager
ATHENA WFI US ContributionsUSSWGCo-Chairsmeeting
January5,2017
PSU,MIT,SAO,Stanford/SLAC
ide ield mager
WFI has unprecedented sensitivity to extended sources
1/5/2017 USSWGCo-ChairsPresentation 2
• ATHENAwillhave~30xChandra’sareaandthusmuchbetterpointsourceandsurface-brightnesssensitivity
• VerylargeFOV(40’x40’),CCD-likeenergyresolution
• Probabilityofserendipitousdetectionoftransientsourcesisnotnegligible
• Lowandwell-understoodbackgroundisrequiredtoexploitthiscapability
.
XIFUFOV
WFIFOV
ide ield mager
US Contributions: Enhance science in 3 areas
1/5/2017 USSWGCo-ChairsPresentation 3
1) Transientsourcesa) Analyzeobservingtargetforvariability,providefeedbacktoinstrumenton
whethertheselectingobservingmodeisappropriateb) Searchforserendipitoussourcesbrighterthancatalogfluxes
2) Clustersandotherextendedsources:a) Improvebackgrounddeterminationthroughon-boardanalysisofallevents.
i. On-boardeventrecognitionrejects>99.5%ofbackgroundevents,whicharenottelemeteredtotheground
ii. On-boardbackgrounddeterminationcanimproveknowledgeofbackgroundlevelandvariability
3) Providecriticalmechanicalandelectronicsupportrequiredforsuccessfulinstrumentdesign
ide ield mager
US Contributions: 3-pronged approach
1/5/2017 USSWGCo-ChairsPresentation 4
1) ScienceProductsModule(SPM)a) Space-qualifiedprocessorboardtoperformancillaryanalysisonon-board
sciencedatastream(PSU)[TBD:Go/NoGodecisionwillbemadein2019]b) SPMsoftware
i. TransientAnalysisModule(PSU)ii. BackgroundAnalysisModule(MIT+SAO)
2) Front-endelectronicsASICdesign(Stanford/SLAC)3) PrimaryWFIMechanicalStructure
a) InterfacesbeingmonitoredbyGSFC,design/fabricationTBD
ide ield mager
WFI Block Diagram
1/5/2017 USSWGCo-ChairsPresentation 5
Cold Camera Head
Front-End Electronics
Frame Processor
Central !Processing !
Module
Commands! / Data
Instrument Control and Power distr. Unit (ICPU)
SPM
ASICs
ADCsDetector Electronics
Power Supply !Unit
DEPFET Sensors
ide ield mager
1) Science Products Module Software
1/5/2017 USSWGCo-ChairsPresentation 6
TransientAnalysisModule• Monitorscentralsourcefor
variabilityandpileup
• Searchesfortransientobjectsbycomparingimagestocatalogs
• Willbeabletofindshockbreakoutevents(likeSN2008D),TidalDisruptionEvents,andnewLMXBsandHMXBsinMilkyWayandnearbygalaxies
• InfoontransientswillbesenttogroundviaHKtelemetryforrapidprocessing
SN2008DSoderberg etal.2008
ide ield mager
1) Science Products Module Software
1/5/2017 USSWGCo-ChairsPresentation 7
BackgroundAnalysisModule• Processesfulldatastreamfromdetectorsto
measureinstrumentbackgroundon-orbit
• Onboardanalysishasaccessto~10xmorerawbackgrounddatathanistelemeteredtoground
• Produceshigh-levelproductsincludingbackgroundspectraandspatialbackgroundmaps
• Dataproductstelemeteredwithnormalsciencetelemetry(nottime-critical)
ide ield mager
2) ASIC Design
1/5/2017 USSWGCo-ChairsPresentation 8
• WFIrequiresextremelyhighspeedreadoutatextremelylownoisetoenableblackholesciencegoals• PerformanceofWFIdependscriticallyontheASICsthatreaditout• Noiselevelsmustbe<fewelectronsRMS
• MPEhasrequestedsupportfromSLACtodebugandrefinetheASICdesign