# Presentation: 874353

## 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

## 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

## 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

## DES Instrument Project Costs

| Fiscal Years | FY04 | FY05 | FY06 | FY07 | FY08 | FY09 | Total | Total + Cont. |
| --- | --- | --- | --- | --- | --- | --- | --- | --- |
| M&S | $0  | $1,003  | $2,501  | $3,729  | $893  | $132  | $8,258  | M&S |
| M&S cont. | $0  | $103  | $211  | $1,620  | $664  | $567  | $3,165  | $11,423  |
|   |   |   |   |   |   |   |   |   |
| Labor | $211  | $1,222  | $942  | $1,362  | $763  | $322  | $4,822  | Labor |
| Labor Cont | $105  | $611  | $490  | $736  | $429  | $188  | $2,559  | $7,381  |
|   |   |   |   |   |   |   | $18,804  |   |

- 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

## DES Instrument Reference Design

- 3556 mm

- 1575 mm

- Camera

- Filters

- Optical
- Lenses

- Scroll
- Shutter

## Camera Reference Design

- Focal Plane

- 62   2k x 4k CCDs for main image,
- 4-side buttable, 15 micron pixels
-  8    1k x 1k  CCDs for guiding and focus

- Camera Design

- Focal Plane

- feed through
- board

- Frontend
- electronics

## 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

## 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.

- 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.

- Front End Electronics and Data Acquisition

- Monsoon architecture:

- FEE

- DAQ
- UIUC is leading DAQ

## 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!

## 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**

## 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

## 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