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


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.


HAWC+detectorarrays


polarizingbeamspliaer

‘R’detectorarray

‘T’detectorarray

T0

R0 R1

•  Allintendedscienceobservingmodeswereexercisedandsuccessful.–  SomecalibraGonobservaGons(e.g.,skydip)werenotaaempted.

•  Chop-Nod-HWPStep-Dither:onlydeliveredmodeforpolarimetry–  StokesIalsomeasured,inaddiGontoQ,U


HAWC+observingmodesno

dsequ

ence

Half-WavePlateseq.

4angles,60seceach

4-posiGondithersequence

HAWC+observingmodes•  Lissajous:recommendedscanmodeforimagingcompactsources(<fieldofview)– Workedverywell!


360arcsecpk-pk,200arcsec/sec,60secduraGon

600arcsec

detectorF.O.V.(215μm)

•  raster(lawnmower):reasonablescanmodeforimaginglargerfields


HAWC+observingmodes

3000arcsec

200arcsec/sec,19min.duraGon5pausestocross-checkgyrosvs.startracking

detectorF.O.V.(215μm)

HAWC+first-lightresults


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)


•  TheseimagesdemonstratethattheHAWC+bandswillbeabletodisGnguishwarmandcolddustcomponentsofclouds.



•  PolarizaGonobservaGonswerecollectedforJupiter,Jovianmoons,andDR21coreinmulGplebands.

•  PolarizaGonsignalsareexpectedtobeweak(~1%oftotalintensity),sowewillneedtotreatthedetectornoiseandgainfluctuaGonscausedbyvariablebasetemperaturecarefully.

•  Preliminaryupperlimitof4%onpolarizaGoncausedbytelescope+instrumentat53μm.



•  Verypreliminaryanalysisindicatesthatdespitetheproblemswithcoolingthedetectoradequately,thesensiGvityiswithinafactorof2ofpre-flightpredicGons.– ReliesonremovingtemperaturefluctuaGonnoisewhichiscorrelatedfromdetectortodetector;wepresumethisnoisewillbemuchreducedarerimprovementstocoolingsystem.


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+.


HAWC+/SOFIAUsersGroup•  Cycle4shared-risksciencewithHAWC+:–  Timingofinstrumentworkismadechallengingbypersonnelavailability(summervacaGons,SOFIAdeployment)andGSEreadiness/B703processes.

–  ThemostopGmisGcscenariohasHAWC+inimprovedcondiGonandreadyforCommissioningPart2inAugust.Couldfollowwithshared-riskscience.

–  Thereareseveralfactorswhichcouldeachcause~1monthslipstothatschedule.

•  TheHAWC+teamhadaveryposiGveexperienceworkingwiththeObservatorystaff,andwelookforwardtomanyhappyreturns.


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