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Dark Energy Survey . 5000 sq-deg in the South Galactic Cap in 30% of 5 years (’09 –’14) 300,000 galaxies, 30,000 clusters, 2000 SN- Ia 3 sq-degree camera with ≥ 2.2 deg FOV SDSS g,r,i,z filters covering 400 to 1100nm Limiting mag of griz =22.8, 23.4, 24.0, 23.6

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Dark Energy Survey

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Dark energy survey l.jpg

Dark Energy Survey

5000 sq-deg in the South Galactic Cap in 30% of 5 years (’09 –’14)

  • 300,000 galaxies, 30,000 clusters, 2000 SN- Ia

  • 3 sq-degree camera with ≥ 2.2 deg FOV

  • SDSS g,r,i,z filters covering 400 to 1100nm

  • Limiting mag of griz =22.8, 23.4, 24.0, 23.6

    Prime Focus Cage of the Blanco Telescope

    We plan to replace this and everything inside it

Brenna Flaugher for the DES Collaboration Feb. 2005

Fermilab, U Illinois, U Chicago, LBNL, CTIO/NOAO


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DES Status

  • DES went through the PAC in April and June 04

  • July 04 we received Stage 1 approval

    • permission to submit full technical proposal to NOAO

    • license to recruit funding

  • Aug/Sept 04: reviewed and accepted by NOAO

  • Awaiting outcome of the Dark Energy Task Force

    • DETF should issue a report in summer 05

    • If favorable DOE will proceed directly with CD-0 followed shortly by CD-1

    • Need to get Equip. funds in FY07 to stay on 2009 delivery schedule.

  • FY05/06 are R&D years

    • CCDs: establish yield, learn to test CCDs, demonstrate packaging

    • Optics: finalize design

    • Front End Electronics – develop system design, begin prototyping, testing

      Develop firm cost of project for CD1 review in early FY06

Brenna Flaugher for the DES Collaboration Feb. 2005

Fermilab, U Illinois, U Chicago, LBNL, CTIO/NOAO


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DES Organization

  • DES is divided into 2 projects under direction of Project director (J. Peoples)

    • WBS 1.0 Instrument project – Fermilab

    • WBS 2.0 Data Management project – UIUC/NCSA

Instrument project

provides simulated and real data to Data management project

Until now:

Instrument Construction

has been mainly PPD

Survey Planning has been

CD-EAG

Brenna Flaugher for the DES Collaboration Feb. 2005

Fermilab, U Illinois, U Chicago, LBNL, CTIO/NOAO


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DES Instrument Project Costs

Have lined up M&S funding from UIUC ($400k), UChicago($400k) and

PPD ($240k so far in FY05)

Univ. College London will submit $1.3M pound ($2.6M) proposal to PPARC

they would contribute to the optics if successful

Barcelona has submitted a proposal to Spanish Gov. ($700k total)

they would contribute to Front End Electronics and CCD testing

Brenna Flaugher for the DES Collaboration Feb. 2005

Fermilab, U Illinois, U Chicago, LBNL, CTIO/NOAO


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DES Instrument Reference Design

3556 mm

Camera

Scroll

Shutter

1575 mm

Filters

Optical

Lenses

Brenna Flaugher for the DES Collaboration Feb. 2005

Fermilab, U Illinois, U Chicago, LBNL, CTIO/NOAO


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Camera Reference Design

Focal Plane

Camera Design

feed through

board

62 2k x 4k CCDs for main image,

4-side buttable, 15 micron pixels

8 1k x 1k CCDs for guiding and focus

Frontend

electronics

Focal Plane

Brenna Flaugher for the DES Collaboration Feb. 2005

Fermilab, U Illinois, U Chicago, LBNL, CTIO/NOAO


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Front End Electronics and DAQ

  • Large focal plane implies long cables between CCD and electronics crates

  • Reference design being developed – may have preamps close to CCDs in kapton cables

  • Goals are noise < 5 e-, linearity <0.25%, support a readout rate of 250 kpix/sec

  • Reliable operation requires careful consideration of internal and external components

  • Minimize heat generated in the PF cage by locating DAQ off telescope

off the cage

Brenna Flaugher for the DES Collaboration Feb. 2005

Fermilab, U Illinois, U Chicago, LBNL, CTIO/NOAO


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Front End Electronics and Data Acquisition

Monsoon architecture:

DES plans to use Monsoon DHE and DAQ as starting point for FEE and DAQ.

Monsoon will be used for testing CCDs until Production FEE is available

Modifications needed:

higher density than in current design (16 channels instead of 8)

Minimize space and power on the telescope.

DAQ

UIUC is leading DAQ

FEE

Brenna Flaugher for the DES Collaboration Feb. 2005

Fermilab, U Illinois, U Chicago, LBNL, CTIO/NOAO


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Schedule Milestones

  • Optics and CCDs are the most Challenging tasks

  • CCDs: Initial run: FY05, Yield determination FY06 and FY07

  • Optics: Order glass in FY06, Figuring/polishing in FY07

Fully Commissioned by

June 2009!

Brenna Flaugher for the DES Collaboration Feb. 2005

Fermilab, U Illinois, U Chicago, LBNL, CTIO/NOAO


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Potential CD involvement: Hardware

  • Front End Electronics: Terri Shaw is leading the effort

    • she is 50% DES plus we have 50% of another EE

    • schedule says we need 3 EE FTE this year

      • Barcelona will provide 0.5 -1 by end of summer ; could use more at FNAL !!!

    • Test stand support: adapter cables, cards, Monsoon operations

    • FEE System design: workshop March 14-18

      • will bring together all the experts: CTIO, Tucson, Barcelona

      • flesh out the overall system design, define strategy for getting questions answered, organizing the different groups

  • Other tasks that could use CD electrical engineering support:

    • “Slow” controls – Del Allspach is leading this

      • control of shutter, filter, focal plane temperature, vac. pressure

      • May have space/heat constraints that requires EE to design custom boards

    • Telescope/Instrument controls:

      • Coordination of all the disparate systems: Slew telescope, open shutter, guide telescope, start DAQ

      • CTIO will lead, but they do not have enough resources

Brenna Flaugher for the DES Collaboration Feb. 2005

Fermilab, U Illinois, U Chicago, LBNL, CTIO/NOAO


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CD involvement: “software”

  • DES Instrument project (FNAL) provides simulated and real data to DM project

    • Simulations going on now, form data challenges each year

  • FNAL also should be capable of contributing to data reprocessing during the survey (2009-2014)

  • Resources are collected under WBS 1.3 Survey planning;

  • CPs needed: 0.5 FTE in ‘05, 1 in ‘06, 2 in each ‘07 and ’08

    This is roughly consistent with what is available in EAG, without increasing the size of the EAG CP group; but is tight until SDSS ramps down (July 2008)

  • The ability for FNAL to do DES science analysis would be enhanced by adding additional resources that increase access to the data:

    • high performance data bases developed at FNAL

    • grid based mass data storage transfers

    • further development of National Virtual Observatory at Fermilab

  • Chris will say more about these – the point is that they would all benefit DES

Brenna Flaugher for the DES Collaboration Feb. 2005

Fermilab, U Illinois, U Chicago, LBNL, CTIO/NOAO


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Conclusions

  • We have passed the initial reviews, and have embarked on an R&D plan with funds for collaborating institutions + Fermilab

  • CD could get involved in DES “hardware”:

    • Front End Electronics, “slow” controls, Telescope/Instrument controls

  • CD is already contributing to Survey Planning,

    • Critical that EAG support be maintained

  • Further development of data access technologies would increase the ability for FNAL to do DES science

Brenna Flaugher for the DES Collaboration Feb. 2005

Fermilab, U Illinois, U Chicago, LBNL, CTIO/NOAO


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