The Dark Energy Spectroscopic Instrument, DESI in 10minsccatconf.astro.cornell.edu/wp-content/uploads/2020/... · 5/9/2020 · Gutierrez Gaston leadership of the construction of

Dark Energy Spectroscopic InstrumentU.S. Department of Energy Office of ScienceLawrence Berkeley National Laboratory

Will PercivalApril 9, 2020

The Dark Energy Spectroscopic Instrument,

DESI in 10mins

https://www.desi.lbl.gov/https://arxiv.org/abs/1611.00036https://arxiv.org/abs/1611.00037


DESI contributors (https://www.desi.lbl.gov/desi-builders)

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Waterloo CCAT-prime meeting, April 9, 2020

Will Percival

Aguilar Jessica leadership of petal fabrication and assemblyAmeel Jon contributions to the focal plane electronicsBailey Stephen leadership of the data systems and data pipeline developmentBaltay Charles contributions to the fiber view cameraBebek Chris leadership as Instrument ScientistBesuner Robert leadership as Project Manager and Systems EngineerBlanc Pierre-Eric contributions to the spectrographsBlum Robert contributions to project management and governanceBramall David contributions to the fiber systemBrooks David contributions of the wide-field correctorBuckley-Geer Elizabeth contributions to the instrument control systemBurleigh Kaylan contributions to the imaging surveyCahn Robert contributions to the design of the surveyCarton Pierre-Henri contributions to the spectrographs and cryostatsClaybaugh Todd contributions to the focal plane systemCooper Andrew contributions to the support of the bright galaxy and milky way scienceDawson Kyle contributions to the design of the survey and survey validationDerwent Mark contributions to the spectrographsDey Arjun leadership of the observations and contributions to the imaging surveysDhungana Govinda contributions to the data systemDobson Carl contributions to the instrument softwareDoel Peter leadership of the construction of the wide-field correctorDuan Yutong contributions to the focal plane systemEdelstein Jerry contributions to the spectrographsEftekharzadeh Sarah contributions to the survey designEisenstein Daniel leadership as collaboration Spokesperson and contributions to the design of the surveyElliott Ann contributions to the instrument operation pipelineEstrada Juan contributions to the CCD packagingFagrelius Parker contributions to the instrument and its commissioningFanning Kevin contributions to the focal plane systemFlaugher Brenna leadership as Project Scientist and leadership of the AIT&C subsystemGaztanaga Enrique contributions to the imaging validationGutierrez Gaston leadership of the construction of the wide-field corrector

Guy Julien leadership as Project Scientist and contributions to the data pipelineHarris Stewart leadership as Systems EngineerHeetderks Ian contributions to the construction of the focal planeHeetderks Henry leadership as Project ManagerHerrera David contributions to the imaging surveyHonscheid Klaus leadership of the development of the instrument control systemIshikawa Yuzo contributions to the spectrographsJelinsky Patrick leadership of the construction of the spectrographsJelinsky Sharon contributions to the construction of the focal planeJimenez Jorge contributions to the construction of the guidersJoyce Richard leadership as Instrument Scientist for NOAO/MayallKarcher Armin contributions to the detector electronicsKarkar Sonia contributions to the spectrographsKehoe Robert contributions to the data system and to project managementKent Stephen contributions to the focal plane softwareKirkby David contributions to the survey designKisner Theodore contributions to the pipeline softwareKitanidis Ellie contributions to the imaging surveyLambert Andrew contributions to the focal plane systemLandriau Martin contributions to the imaging surveyLang Dustin contributions to the imaging surveyLee Jae Hyeon contributions to target selectionLevi Michael leadership of the DESI project as DirectorMagneville Christophe contributions to the spectrographs and cryostatsMartini Paul leadership as instrument scientist and contributions to the commissioning instrumentMcDonald Patrick contributions to the survey designMeisner Aaron contributions to the imaging surveyMiller Tim contributions to the wide-field correctorMoustakas John contributions to the imaging surveyMyers Adam leadership of the target selection pipelineNewman Jeffrey contributions to the target selectionNie Jundan contributions to the imaging surveyPalanque-Delabrouille Nathalie leadership as Spokesperson and contributions to target selectionPappalardo Daniel contributions to the spectrographsPeng Xiyan contributions to the imaging surveyPercival Will contributions to the preparation of the galaxy and quasar clustering sciencesurvey

Poppett Claire leadership of the fiber systemPrada Francisco contributions to the fiber positionersProbst Ronald contributions to the telescope and installation workRabinowitz David contributions to the fiber view cameraRaichoor Anand contributions to the target selectionRockosi Constance leadership as Commissioning ScientistRoe Natalie contributions to the project managementRonayette Samuel contributions to the spectrographsRoss Ashley contributions to the commissioning instrumentSchlafly Edward contributions to the imaging survey and to the focal planeSchlegel David leadership as Project Scientist and contributions to the imaging surveySchubnell Michael contributions to the fiber positionersSharples Ray leadership of the fiber systemSilber Joseph leadership of the construction of the focal planeSprayberry David leadership of the installation of the corrector and instrumentStaten Ryan contributions to the data systemTarle Gregory contributions to the fiber positioners and for leadership as institutional board chairValdes Francisco contributions to the imaging surveyWeaver Benjamin contributions to the software infrastructureWeaverdyck Curtis contributions to the fiber positionersWechsler Risa leadership as collaboration Spokesperson and contributions to survey leadershipYeche Christophe contributions to the target selection and survey validationZhang Kai contributions to the focal planeZhang Tianmeng contributions to the imaging surveyZhou Zhimin contributions to the BASS imaging surveyZhou Xu contributions to the BASS imaging surveyZhou Rongpu contributions to the target selectionZou Hu contributions to the BASS imaging survey


6 million Luminous Red Galaxies (LRG)

17 million Emission Line Galaxies(ELG)

2.4 million Quasi Stellar Objects(QSO)

DESI is > 20x faster than SDSS (factor 5 from fibers, 4 from telescope)DESI is the first Stage-IV Dark Energy Experiment to go on-sky

Dark energyturns on here

?

10 million brightest galaxies

DESI - the largest spectroscopic survey for dark energy

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DESI will collect 35 million spectra

Expa

nsio

n ra

te H

(z) /

(1+z

)

Current data

– 5 classes of observation• Bright Galaxies• Luminous Red galaxies• Emission Line Galaxies• Quasars as tracers• High redshift quasars for Ly-a forest

– Geometrical measurements using Baryon Acoustic Oscillations

– Growth measurements using Redshift Space Distortions

– Lots of other science, including cross-correlations with other surveys (including CCAT-prime)

Redshift z


DESI cosmological predictions (arXiv:1611.00036)

Total mass >0.059eV >0.10eV

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New wide-field optical corrector and focal plane are installed & working at the Mayall Telescope at Kitt Peak

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• 6 lenses, largest ~1m in diameter • First light of corrector images was

measured to be 0.7 arcsec (April 1, 2019)• Whirlpool galaxy as viewed by

Commissioning Instrument


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Installation and commissioning

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Ten petals constructed

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<5 µm rms typical positioning accuracy as-installed


Ten petals installed

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Installation of the focal plane instrument was completed in August, 2019. The picture below shows the fiber ends of the 5,000 robotic positioners on the focal plane.


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Ten spectrographs installed

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10 DESI spectrographs 30 cryostats, 30 CCDs500 million pixels!!


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On-sky end-to-end throughput (lines) vs predictions (circles)


Pre-Imaging Surveys

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14,000 sq deg of Imaging data for targetingAll data public - http://legacysurvey.org

BASS gr-bandsMzLS z-bandDECaLS grz-bands

• North(5k deg2)

• South(9k deg2)

Three optical surveys completed~1.5 mags deeper than SDSS

• All Sky WISE (NASAsatellite)W1W2 bands

One infrared survey completed

• Images combined using Tractor code• DR8 published July 2019• Final data release by Q2 2020• Viewer and other tools available:


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Mini-Survey Validation

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• Bright Galaxy Survey

• Luminous Red Galaxy Survey


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Mini-Survey Validation

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• Emission Line Galaxies (ELG)

• Quasi-Stellar Objects (QSO)


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Science can start as soon as safety permits

14

2019 2020 2021 2022

DESISurvey

SurveyValidation

DR9Imaging

Target selection

Commissioning

Key ProjectsGoal for Year 1

cosmology papers

DR1DA1Data assembly (DA) DA 0.5DA SV

Year 2 Key Projectsdefined

SV + Surveytargets

We are here


Will Percival

?


Thanks to our sponsors and 69 Participating Institutions!

Documents

The Dark Energy Spectroscopic Instrument, DESI in 10minsccatconf.astro.cornell.edu/wp-content/uploads/2020/... · 5/9/2020 · Gutierrez Gaston leadership of the construction of