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Dark Energy Survey

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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  1. 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

  2. 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

  3. 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

  4. 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

  5. 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

  6. 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

  7. 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

  8. 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

  9. 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

  10. 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

  11. 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

  12. 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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