Brenna Flaugher for the DES Collaboration Feb. 2005

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

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 RD 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

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
4
DES Instrument Project Costs
Have lined up MS 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
5
DES Instrument Reference Design
3556 mm
Camera
Scroll Shutter
1575 mm
Filters
Optical Lenses
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
7
Front End Electronics and DAQ
off the cage

• 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 lt 5 e-, linearity lt0.25, 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

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
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!
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

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

12
Conclusions

• We have passed the initial reviews, and have
  embarked on an RD 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