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David James (CTIO) for the Dark Energy Survey Pan-STARRS1: Science Results STScI , Baltimore - 24 June 2014 PowerPoint PPT Presentation


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The Dark Energy Survey:. Dark Energy Camera – DES: YR1 of the Dark Energy Survey. David James (CTIO) for the Dark Energy Survey Pan-STARRS1: Science Results STScI , Baltimore - 24 June 2014. The Dark Energy Survey:. Survey project to probe signatures of

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David James (CTIO) for the Dark Energy Survey Pan-STARRS1: Science Results STScI , Baltimore - 24 June 2014

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David james ctio for the dark energy survey pan starrs1 science results stsci baltimore 24 june 2014

The Dark Energy Survey:

Dark Energy Camera – DES:

YR1 of the Dark Energy Survey

David James (CTIO)

for the Dark Energy Survey

Pan-STARRS1: Science Results

STScI, Baltimore - 24 June 2014


David james ctio for the dark energy survey pan starrs1 science results stsci baltimore 24 june 2014

The Dark Energy Survey:

  • Survey project to probe signatures of

  • Dark Energy using four complementary

  • techniques:

    • Cluster Counts

    • Weak Lensing

    • Large-scale Structure

    • Supernovae

  • Two multiband surveys:

    • 5000 deg2: 10σgriz(Y) to 24th (21.6th) mag

    • 30 deg2: repeated SNe fields

  • Build new 3 deg2FoV camera

  • and data management system:

    • Survey 2013-2018 (525 nights)

    • Facility instrument for Blanco

Blanco 4-metre Telescope at CTIO

http://lsst.org

Pan-STARRS1: Science Results Dark Energy Survey David James


David james ctio for the dark energy survey pan starrs1 science results stsci baltimore 24 june 2014

The DES Collaboration

Fermilab

University of Illinois at Urbana-Champaign/NCSA

University of Chicago

Lawrence Berkeley National Lab

NOAO/CTIO

DES Spain Consortium

DES United Kingdom Consortium

University of Michigan

Ohio State University

University of Pennsylvania

DES Brazil Consortium

Argonne National Laboratory

SLAC-Stanford-Santa Cruz Consortium

Universitats-Sternwarte Munchen

Texas A&M University

plus Associate members at: Brookhaven National Lab,

U. North Dakota, Paris, Taiwan

Several hundred members

plus students & postdocs

Funding: DOE, NSF; UK: STFC, SRIF; Spain Ministry of Science, Brazil: FINEP, Ministry

of Science, FAPERJ; Germany: Excellence Cluster; collaborating institutions

Pan-STARRS1: Science Results Dark Energy Survey David James


David james ctio for the dark energy survey pan starrs1 science results stsci baltimore 24 june 2014

DarkEnergyCamera:

A new prime focus instrument

CCD

Readout

Filters +

Shutter

Focal plane (detector, 62+ CCDs)

Hexapod

Corrector

Lenses

Pan-STARRS1: Science Results Dark Energy Survey David James


David james ctio for the dark energy survey pan starrs1 science results stsci baltimore 24 june 2014

Brave New World: DECam

Pan-STARRS1: Science Results Dark Energy Survey David James


David james ctio for the dark energy survey pan starrs1 science results stsci baltimore 24 june 2014

Controlling DECam: SISPI

  • Data Flow:

    • Image acquisition (Panview, 6 Monsoon crates)

    • Image Builders (multiple instances)

      • FITS formatting

      • Image Health

      • Telemetry

      • Compression

    • Submit to NCSA (DTS)

  • Observation Control:

    • OCS (pipeline architecture)

    • OBSTAC

  • Instrument Control:

    • Internal (shutter, hexapod, filters)

    • External (cooling, temperatures, ICC)

  • Guider & Focus:

  • Interfaces to TCS & Cloud Camera:

SISPI is the DECamdata

acquisition and control system:

Pan-STARRS1: Science Results Dark Energy Survey David James


David james ctio for the dark energy survey pan starrs1 science results stsci baltimore 24 june 2014

The Dark Energy Camera: Detector

2k x 2k

Focus &

Alignment

2k x 2k

Guide

2k x 2k

Focus &

Alignment

2k x 2k

Guide

Pan-STARRS1: Science Results Dark Energy Survey David James


David james ctio for the dark energy survey pan starrs1 science results stsci baltimore 24 june 2014

2 tilings

3 tilings

(original) DES Observing Strategy:

  • Sept-Feb observing seasons

  • 80-100 sec exposures

  • 2 filters per pointing (typically)

    • grin dark time

    • izyin bright/grey time

  • Photometric calibration: overlap tilings, standard stars, spectrophotometric calibration system, preCAM

  • 2 survey tilings/filter/year

  • Interleave 10 SNe fields in griz if non-photometric or bad seeing or time gap (aim for ~5 day cadence)

Pan-STARRS1: Science Results Dark Energy Survey David James


David james ctio for the dark energy survey pan starrs1 science results stsci baltimore 24 june 2014

(present) DES Observing Strategy:

Year 1 regions

SDSS Stripe 82

  • Year 1:

  • Moved footprint eastward to reduce secZ, improve image quality

  • Cover 2000 sq. deg. (4 tilings per filter) rather than full 5000 sq. deg. (2 tilings) to improve photometric calibration

  • Allow g, Y observations with seeing>1.1” (not used for Weak Lensing).

  • Year 2:

  • Complementary 3000 sq. deg.

  • Optimize: many more half-nights than YR1

SPT

By end of YR2, expect will have done 90% of the exposures needed to complete 4 tilings of the 5000 sq. deg. footprint.

Pan-STARRS1: Science Results Dark Energy Survey David James


David james ctio for the dark energy survey pan starrs1 science results stsci baltimore 24 june 2014

Dark Energy Survey: Year 1

  • DES started taking YR1 data on Aug. 31st 2013

  • In January, we switched to 1st half nights

  • Finished YR1 in mid-February 2014

Pan-STARRS1: Science Results Dark Energy Survey David James


David james ctio for the dark energy survey pan starrs1 science results stsci baltimore 24 june 2014

DES: Observing Sequences

Pan-STARRS1: Science Results Dark Energy Survey David James


David james ctio for the dark energy survey pan starrs1 science results stsci baltimore 24 june 2014

Year 1 (vs. SVA1):

Exposure Breakdown

Pan-STARRS1: Science Results Dark Energy Survey David James


David james ctio for the dark energy survey pan starrs1 science results stsci baltimore 24 june 2014

First DES YR1 Image

  • 31st Aug. 2013 23:55

    Local Chilean Time

  • Image DECam_00229250 was transferred to NCSA in Urbana where;

    • DES “Data Management” processed it and made a catalog of the stars and roughly 100,000 galaxies that can be identified in it.

First DES YR1 image is #229250

Pan-STARRS1: Science Results Dark Energy Survey David James


Des operations efficiency measurements

DES Operations EfficiencyMeasurements

  • Only 2 problems lasted as long as 4 consecutive hours: In Oct. we lost a night from a TCS software bug. In Nov. we lost 1½ nights due to problems w/ electronics: noise and missing backplanes, then CCD S30 failed.

  • The other problems are computer interfaces issues, … mostly, shutter resets

  • Shutter was open 63% of “Observing Time” during YR1. Dome control improvements gave us ~4% better efficiency starting in late December 2013.

Pan-STARRS1: Science Results Dark Energy Survey David James


Des wf survey

DES WFSurvey

  • Goal was to observe 4 “tiles” of ~672 images per tile in each of 5 filters

  • 13435 images total

  • Plots here show what we obtained:

    • Gaps in Stripe 82 (North)

    • Gaps in Sept. to Nov. survey area (West)

    • Images in YR2 fields because nothing “available” from YR1 particularly in late Jan. to Feb. ~3k images (17%) of YR2

Pan-STARRS1: Science Results Dark Energy Survey David James


Des sn survey yr1 observations

DES SN Survey: YR1 Observations

  • 10 SN fields. 2 of those are “deep fields”

  • Our plot shows day-by-day SNe cadence

  • 2565/2699 SNe exposures “good” (95%)

  • After 7-days, even when the weather is good, SNe team gets their data on “deadman” condition of OBSTAC.

Pan-STARRS1: Science Results Dark Energy Survey David James


David james ctio for the dark energy survey pan starrs1 science results stsci baltimore 24 june 2014

DES Observing: YR2

Pan-STARRS1: Science Results Dark Energy Survey David James


David james ctio for the dark energy survey pan starrs1 science results stsci baltimore 24 june 2014

First DES (SV) Science Paper:

2014arXiv1405.4285M

Pan-STARRS1: Science Results Dark Energy Survey David James


David james ctio for the dark energy survey pan starrs1 science results stsci baltimore 24 june 2014

Community Use of DECam:

  • DECam-NEOO:

    • Lori Allen (NOAO – PI)

    • 3-yr survey time awarded

    • 1st 10-night block executed April 2014

    • Early results are very encouraging

  • Light-echoes of SNe remnants:

    • Armin Rest (STSci– PI)

    • many nights per semester

    • étendue of DECam critical

    • latest results are now available: Prieto et al. 2014, ApJL, 787, L8

Pan-STARRS1: Science Results Dark Energy Survey David James


Decam current status

DECam Current Status

  • Sensor array is OK except

  • Two CCDs are no longer functioning correctly:

    • N30 11/07/2012

    • S30 11/28/2013

  • 8 CCDs ~12e- RO noise (7e- is typical), spec is 15 e-. Problem comes and goes since late Nov.

  • S7 (½ CCD) non-linearity unstable at very low light levels (<1000e-).

  • Two focus chips have 1 “weak” amplifier.

S30

S7

N30

Pan-STARRS1: Science Results Dark Energy Survey David James


David james ctio for the dark energy survey pan starrs1 science results stsci baltimore 24 june 2014

The DES Collaboration

Thank you !

Pan-STARRS1: Science Results Dark Energy Survey David James


David james ctio for the dark energy survey pan starrs1 science results stsci baltimore 24 june 2014

The DES Collaboration

Pan-STARRS1: Science Results Dark Energy Survey David James


David james ctio for the dark energy survey pan starrs1 science results stsci baltimore 24 june 2014

The DES Collaboration

Pan-STARRS1: Science Results Dark Energy Survey David James


David james ctio for the dark energy survey pan starrs1 science results stsci baltimore 24 june 2014

NOAO

NCSA

For details, ask Brian Yanny, DES Data Coordinator,

or Robert Gruendl, UIUC


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