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DetectorandReadout• Micro-XTESsareMo/Aubilayerswithtransi<on
temperaturesof120mK• Absorbersarecomposedofa0.5µmthicklayerof
Auanda3.1µmlayerofBi• Thedetectorshaveadesignresolu<onof3eVat1
keVandhavedemonstrated4.5eVresolu<ononanon-mul<plexinglabsystemat6keV
• DetectorreadoutisachievedwithaNISTdesigned,rocketflightqualified,varia<onona<medivisionmul<plexingcircuit
AcknowledgementsThisworkwassupportedbyaNASASpaceTechnologyResearchFellowship.TheMicro-XprojectisconductedunderNASAgrantNNX10AE25G.
DetectorCalibra<onoftheMicro-XSoundingRocketX-rayTelescope1,2D.C.Goldfinger,3,4J.S.Adams,3R.Baker,3S.R.Bandler,2N.Bas<don,2M.E.Danowski,5W.B.Doriese,3M.E.Eckart,2E.Figueroa-Feliciano,1S.N.T.Heine,5G.C.Hilton,2A.J.F.Hubbard,3R.L.Kelley,3C.A.Kilbourne,2R.Manzagol,6D.McCammon,3T.Okajima,3F.S.Porter,5C.D.Reintsema,3P.Serlemitsos,3,4S.J.Smith,1,7P.Wikus1MassachusebsIns<tuteofTechnology,2NorthwesternUniversity,3NASAGoddardSpaceFlightCenter,4UniversityofMaryland,5Na<onalIns<tuteofStandardsandTechnology,6UniversityofWisconsin,7nowatBrukerBioSpinAG
Micro-XIntroduc<onThisisasoundingrocketborneimagingspectrometerthatusesanarrayofTransi<onEdgeSensors(TES)toperformmicrocalorimetryonincomingX-rays.ThetemperaturecontrolisachievedwithanAdiaba<cDemagne<za<onRefrigerator.ItsfirstflightisplannedtotargetthePuppisAsupernovaremnanttomeasureelementalabundancesandtocompareplasmadiagnos<csfromresolvedemissionlines.
• Apogeeof299km• Observa<on<meof
300sec• 128pixelarray• Effec<veareaof
300cm2• Woltertypeop<c
• 2.6arcminPSF• 11.8arcminFieldof
View• Basetemperatureof75
mK
UpdatesonStatus• Cryostatmovedtonew,fullyopera<onalMicro-X
labatNorthwesternUniversity• PassedtheNASAdesignreview;currentdesignis
approvedforflight• Beginningthefinalassemblyofthecryostatwith
filtersinlaunchconfigura<on
Micro-Xdetectorplane
DetectorArray
MUXChipControlThermometers
Noisespectrumwithoutan<-aliasfiltering.Thisdataisinastatemoresimilartotheenergyspectrabelow
EnergyResolu<on• Directmeasurementsoftheenergyresolu<on
weremadewithourflightcalibra<onsource.• Thebestmeasuredresolu<onwiththeflight
systemis9.88eVwhichinferiortotheNEP.• Shijsinthebaselinethataretoosharpforourdrij
correc<onhadcontributedtothisdifference,butthiscanbemademorestablewithSQUIDtuning.
• Lowfrequencylinesthatproduceoscilla<onsvisibleinthe<medomainprovidetheremainderofthegap.
• Filteringtheselinesinthe<medomainpriortotheimplementa<onofthephase-insensi<veop<malfiltermayimprovetheenergyresolu<on.
DetectorNoise• WehavemodeledourTESswiththeknowndesign
parametersandgetagoodfittoX-raypulses.• Inordertofitthenoisespectrum,excessnoise
needstobeaddedtothemodel,andtheexcessphonon-likenoiseisthedominantcomponentoftheintegratednoiseequivalentpower(NEP).
• Totalmul<plexedelectronicsnoiseis40pA//√Hz,whichisbelowthelevelofthedetectornoise
RadioFrequencyPickup• Webelievethattheexcessphononnoiseis
generatedbyRFpickupintothecryostatwhichmanifestsashea<nginthedetector.
• Theflightboxthatinterfacesbetweenthecryostatandroomtemperatureelectronicsallowsmorepickupthanthelaboratoryequivalent.Weareinves<nghowtogeneratea<ghterelectricalseal.
• Suscep<bilitytothisnoisetypevariesfrompixeltopixel.Thereisnopabernofwhichpixelsareworsewithinthereadoutwiringscheme,sothenoisehastoenterthedetectorsdirectly.
EnergyspectrumofdatatakenonaMicro-Xpixel,zoomedinontheKK-αline.
PixelYB01PotassiumK-αlineFWHM=9.88±0.2eVΧ2=1.03
Timelineofremainingworkun<lflight.LaunchscheduledforFebruary2018.
6/24/17 7/24/17 8/23/17 9/22/17 10/22/17 11/21/17 12/21/17 1/20/18
GSE built Optics
Clean/reassembly FEA wirebond
Avionics assembly Science electronics testing
Get avionics vibed Flight configuration tests
PIR Travel to WFF
Integration tests MRR
Ship to WSMR Travel to WSMR
WSMR tests Launch
PixelYB01NoiseTracesFWHM=7.01±0.067eVΧ2=0.55
EnergyspectrumofdatatakenonaMicro-Xpixel,zoomedinonnoisetraces.
Noisespectrumforarepresenta<veTESintheMicro-Xarray,biased30%intothetransi<on.Thesuddendropinthenoiseat8.4kHzistherollofffrequencyofthedigitalan<-aliasfilterthatcorrectsfortheeffectsfromthedecima<onofdata.