HAWC+ Status for SOFIA Users Group · HAWC+ Status for SOFIA Users Group C. Darren Dowell for HAWC+...
Transcript of HAWC+ Status for SOFIA Users Group · HAWC+ Status for SOFIA Users Group C. Darren Dowell for HAWC+...
HAWC+StatusforSOFIAUsersGroup
C.DarrenDowellforHAWC+team2016May26
Note:ThispresentaGoncontainspreliminarycommissioning
data.PleaseconsultwithHAWC+P.I.beforeusingordistribuGngthismaterial.
2016May26 SOFIAUsersGroup/HAWC+status 1
Topics
• instrumentstatus• observingmodes• firstresults• pipelinestatus• issuesfortheSUG
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HAWC+instrument:status
• Overall,CommissioningPart1wassuccessful.– AllsubsystemsfuncGonalandnowdemonstratedinflight.– Allprimaryobservingmodesexercised,withdatanowinhand.
• However,asignificantproblemwiththe<1KcoolerwillrequirefurtherworkoninstrumentbeforeCommissioningPart2.– VibraGonduringobservingcondiGonsisthecause,producingexcess0.2mWon
cooler(AdiabaGcDemagneGzaGonRefrigerator).– CoolerholdGmewasinsufficientforfullSOFIAflight.– Detectorbasetemperaturewashigh(~250mKvs.planned~150mK)andstrongly
variable,whichcomplicatesthescienceanalysis.– Coolingproblemissolvable,butwillrequire~2monthsofworkoninstrument.
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HAWC+detectorarrays
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polarizingbeamspliaer
‘R’detectorarray
‘T’detectorarray
T0
R0 R1
• Allintendedscienceobservingmodeswereexercisedandsuccessful.– SomecalibraGonobservaGons(e.g.,skydip)werenotaaempted.
• Chop-Nod-HWPStep-Dither:onlydeliveredmodeforpolarimetry– StokesIalsomeasured,inaddiGontoQ,U
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HAWC+observingmodesno
dsequ
ence
Half-WavePlateseq.
4angles,60seceach
4-posiGondithersequence
HAWC+observingmodes• Lissajous:recommendedscanmodeforimagingcompactsources(<fieldofview)– Workedverywell!
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360arcsecpk-pk,200arcsec/sec,60secduraGon
600arcsec
detectorF.O.V.(215μm)
• raster(lawnmower):reasonablescanmodeforimaginglargerfields
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HAWC+observingmodes
3000arcsec
200arcsec/sec,19min.duraGon5pausestocross-checkgyrosvs.startracking
detectorF.O.V.(215μm)
HAWC+first-lightresults
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Band/ObservaBon MeasuredFWHM PredictedFWHM
53μm/GanymedeLissajous 6.1arcsec 4.9arcsec
53μm/Callistochop-nod 7.0arcsec 4.9arcsec
154μm/GanymedeLissajous 13.5arcsec 14arcsec
opGcalboresightcameraJupiterand4moons,May5UT,λ=53μm(logscale)
HAWC+first-lightresults
• TheseimagesdemonstratethattheHAWC+bandswillbeabletodisGnguishwarmandcolddustcomponentsofclouds.
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HAWC+first-lightresults
• PolarizaGonobservaGonswerecollectedforJupiter,Jovianmoons,andDR21coreinmulGplebands.
• PolarizaGonsignalsareexpectedtobeweak(~1%oftotalintensity),sowewillneedtotreatthedetectornoiseandgainfluctuaGonscausedbyvariablebasetemperaturecarefully.
• Preliminaryupperlimitof4%onpolarizaGoncausedbytelescope+instrumentat53μm.
2016May26 SOFIAUsersGroup/HAWC+status 10
HAWC+first-lightresults
• Verypreliminaryanalysisindicatesthatdespitetheproblemswithcoolingthedetectoradequately,thesensiGvityiswithinafactorof2ofpre-flightpredicGons.– ReliesonremovingtemperaturefluctuaGonnoisewhichiscorrelatedfromdetectortodetector;wepresumethisnoisewillbemuchreducedarerimprovementstocoolingsystem.
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HAWC+dataanalysispipeline:status• CommissioningPart1tesGng:AllpartsofthedatareducGonsorware–the
pipelinecore,nod-polpipeline,CRUSH,automaGcin-flightreducGonandwebviewer–havebeentestedandrunsuccessfullyduringrecentflights.
• HAWC+datawasautomaGcallytransferredtotheMCCSforarchiving.• Developmentanddeliveryofcore,nod-pol,automaGcreducGonandwebviewer:
– Pre-flightversionofthesorwarewascompletedinAprilandhasbeendeliveredtoSOFIASWteam.
– Thesorwareisbeingimprovedbasedonexperiencesfromrecentcommissioningflights.ThisversionwillbedeliveredtoSOFIASWteambeforeCommissioningPart2.
• FinalsorwarewillbedeliveredtoSOFIASWteamonceithasbeenvalidatedusingdatafromtheremainingcommissioningflights.
• DocumentaGon:– Usersmanual/Programmersmanual:Severalversionsforcorepackageandnodpolpipeline
havebeendeliveredtoSOFIASWteamforreview.UpdatedversionsthatincludechangesneededbasedonrecentflightswillbesubmiaedwiththesorwareforCommissioningPart2;apreliminaryversionwillbeavailableinJune.
– CRUSHisthemostextensivelydocumentedrouGneintheHAWC+datareducGonpackage.Forexample,see:hap://www.submm.caltech.edu/~sharc/crush/.However,aboutonemonthofworkremainstobedonetoconvertthisdocumentaGontotheHAWC+specificformatandtoincorporatethechangesmadeduringtheadaptaGonofCRUSHtotheneedsofHAWC+.
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HAWC+/SOFIAUsersGroup• Cycle4shared-risksciencewithHAWC+:– Timingofinstrumentworkismadechallengingbypersonnelavailability(summervacaGons,SOFIAdeployment)andGSEreadiness/B703processes.
– ThemostopGmisGcscenariohasHAWC+inimprovedcondiGonandreadyforCommissioningPart2inAugust.Couldfollowwithshared-riskscience.
– Thereareseveralfactorswhichcouldeachcause~1monthslipstothatschedule.
• TheHAWC+teamhadaveryposiGveexperienceworkingwiththeObservatorystaff,andwelookforwardtomanyhappyreturns.
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