# Presentation: 534108

## The DES Instrument: DECam

- 3556 mm

- 1575 mm

- Hexapod

- Optical
- Lenses

- F8 Mirror

- CCD
- Read out

- DECam replaces the prime focus cage on the Blanco

- Filters
- Shutter

- Prime Focus Instrument
- -in optical path
- -space and thermal constraints

## Optical Corrector

- filter

- Dewar
- window

- C1 has
- 940 mm
- diameter

- C2

- C3

- C4

- 5 elements, fused silica

- Andy Stefanik is engineering the barrel
- Must hold lens alignment
- to ~ 25 microns
- Lenses will be purchased
- by UK (PPARK)
- UMich. is designing the Filter/shutter

- Lead Designer Rich Smith control spaces and interfaces

## Camera Vessel Prototype (Herman Cease,)

- 10 slot thermally controlled crate
- for CCD readout electronics (UIUC)

- Cryo and Vacuum controls
- Herman, with help from Rich

- Focal plane

- Feed-through board for CCD signals

- Full size prototype was built by U. Chicago.  It arrived Fermilab in July
- Turned into a big assembly effort – operational in Oct. 06.
- Successfully readout CCDs Oct-Dec.
- Now waiting for Ken to finish installation of heaters and cooling. Testing multiple CCD readout in this vessel is a critical step to development of the FEE

## Slide 4

## This work could also 

- This work could also
- lead to future projects:
- SNAP, LSST

- Working on V2 now
- to fix many problems – Critical path: Greg Derylo

## DECam Schedule 

- Dependent on DOE funding and international participation
- Dark Energy Task force report came out in May, very positive.
- P5 recommended construction start for DES in FY08. HEPAP endorsed this.
- DOE and NSF still trying to figure out how to proceed.
- DOE Critical Decision Process schedule
- CD-0 received Oct. 05
- FY06 Preconceptual R&D; CD1 Directors review July 25-27,
- FY07 R&D,  CD1 combined NSF-DOE Review April/May 07,
- Combined CD2/CD3 Reviews Oct.-Dec. 07
- FY08 MIE Construction start
- FY09-10: Assemble and test camera vessel and corrector
- Ship to Chile and install on Blanco , first DES observations Dec. 10

## DECam Funding Need Profile (Dec 06)(then yr $, Overhead included)

- DECam is applying for R&D funds in FY07-FY08.
- Lab Management wants us to try to keep on schedule
- It is important that we get on the sky in 2010.

- *Additional $7.7M in External funds from Non-DOE sources

- *

|  | FY2007 | FY2008 | FY2009 | FY2010 | FY2011 | Total |   |
| --- | --- | --- | --- | --- | --- | --- | --- |
| DOE MIE | 0 | 6.42 | 7.11 | 4.98 | 0.54 | 19.05 |   |
| DOE R&D | 4.03 | 1.49 | 0 | 0 | 0 | 5.52 |   |
| DOE TPC | 4.03 | 7.91 | 7.11 | 4.98 | 0.54 | 24.57 |   |

## DES Project needs

- Electrical Engineering: Main challenge is <10 e noise.  Terri Shaw is leading a group of 5 EEs and coordinating with Spain and UIUC.  Well supported and making good progress.
- Mechanical Engineering:
- We need 4.5-5 FTE, we are getting ~2.5-3 from PPD, hopefully fractions will increase as CMS pix ramps (Derylo) down and Numi chiller (Stefanik) is replaced
- Have been adding engineers from Chicago and Argonne to pick up jobs that we don’t have the resources to cover at FNAL. FEA and FEM modeling at Argonne is going quickly, starting to turn over pieces of the camera vessel design to Argonne too.
- Rich Smith is our lead designer, keeping overall model of the PF cage.
- Have drafting support, drawings come out slowly, but things are moving
- Main crisis now: We need more of Ken Schultz’s time – project is waiting on him.  December effort: DECam only got .33 FTE total – not just Ken
- We need a wide range of skills: vacuum, soldering, plumbing, mechanical assembly, light machining
- Nominally we get 50% of Ken’s time for DES, but other things (CMS, ILC, dicing in the wet lab etc) come up and  distract him.  Also he can’t do overtime anymore without approval
- We were hoping to add a person to work with Ken, there is more than enough work for 100% of Ken and/or two people split 50% each.

## DES Project needs

- Space and infrastructure:
- 15 ft control room is filled with CCD testing equipment and now has a door, floor has been waxed – adopting clean room protocol
- Installation of Autofill LN2 system as originally designed is  complete!  But, plan was always to add two more cubes: we need to figure out how to do this (Ken)
- Packaging moved from Lab A to Lab C South
- Packaging expert (Jim Wish) transferred and replaced by Michelle Hrycyk
- Changes are bad – had many problems establishing successful packaging again (yield is ~ 1/4 from many different problems)
- ESD continues to be a serious problem, although humidity control is better in Lab C
- Had success packaging last week – maybe things have settled down
- Lab C south used for installation of CCDs in Multi CCD vessel – It is on a cart.

## Isometric view camera end