The DES Instrument: DECam

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The DES Instrument DECam
DECam replaces the prime focus cage on the Blanco
F8 Mirror
Filters Shutter
3556 mm
CCD Read out
Hexapod
Optical Lenses
1575 mm
Prime Focus Instrument -in optical path -space
and thermal constraints
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Optical Corrector
5 elements, fused silica
Dewar window
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
C4
filter
C3
C2
C1 has 940 mm diameter
Lead Designer Rich Smith control spaces and
interfaces
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Camera Vessel Prototype (Herman Cease,)
10 slot thermally controlled crate for CCD
readout electronics (UIUC)

Cryo and Vacuum controls Herman, with help from
Rich
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
Focal plane
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Working on V2 now to fix many problems Critical
path Greg Derylo
This work could also lead to future
projects SNAP, LSST
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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 RD CD1 Directors review July
  25-27,
• FY07 RD, 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

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

Additional 7.7M in External funds from Non-DOE
sources

• DECam is applying for RD 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.

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DES Project needs

• Electrical Engineering Main challenge is lt10 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 dont 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 Schultzs
  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 Kens time for DES, but
  other things (CMS, ILC, dicing in the wet lab
  etc) come up and distract him. Also he cant 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.

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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.

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Isometric view camera end