wiyn noao user s committee october 13 2004
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WIYN: NOAO User’s Committee October 13, 2004. Photo by Amy Eckert, Discover Magazine. Wisconsin, Indiana, Yale, NOAO. Instrumentation at WIYN. Currently supported general-use instruments MiniMosaic (4Kx4K) imager OPTIC (4Kx4K) imager [50% availability from J. Tonry]

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wiyn noao user s committee october 13 2004
WIYN: NOAO User’s CommitteeOctober 13, 2004

Photo by Amy Eckert, Discover Magazine

Wisconsin, Indiana, Yale, NOAO

instrumentation at wiyn
Instrumentation at WIYN
  • Currently supported general-use instruments
    • MiniMosaic (4Kx4K) imager
    • OPTIC (4Kx4K) imager [50% availability from J. Tonry]
    • WTTM (2Kx2K) tip/tilt corrected imager [always on]
    • Hydra [always on]
    • Densepak
    • Sparsepak
  • Near-term upgrades
    • Hydra rebuilt last year for reliability and maintenance
    • Bench upgrades for throughput gains of 2-3X
      • VPH gratings (740 line in-hand; 3550 line in 6 months)
      • New CCD (finer pixels, faster readout, better red/blue)
      • Short FL, off-axis collimator
status bench
Status – Bench
  • Off-axis collimator design completed  awaiting final consensus between project scientist and optical designer
  • 740 line VPH grating ready to be tested – deferred to react to CCD failures and to focus on Hydra commissioning
  • 3550 line VPH grating designed by Matt Bershady
    • R > 20,000 at 510.6 nm; optimized for 450-550 nm
    • glass purchased (250mm x 500mm x 30mm)
    • Fabrication by CSL (Belgium); delivery by December 2004
  • Project web page updated Web Page
  • CCDs being tested (2600x4000 x 12 micron), contract with Univ of Arizona in place to thin, package, and test CCDs
instrumentation on 2 year track
Instrumentation on 2+ Year Track
  • WHIRC – Funded by STScI, WIYN, and (hopefully) NSF
    • 2Kx2K NIR imager for WTTM
    • 0.09” pixels for near-diffraction limited imaging
    • Expected availability – mid-2006
    • Being built at STScI (Margaret Mexiner, Don Figer)
  • QUOTA – NSF funded
    • 8Kx8K imager with OT CCDs (OTAs)
    • 16 arcmin FOV
    • Expected availability – mid-2006
  • ODI – Funding from WIYN (thus far), but NSF proposals to be written
    • 32Kx32K imager with OTAs
    • Details to follow
quota and odi
QUOTA and ODI

ODI (2005)  32K x 32K Array -- Uses 64 OTAs

QUOTA (2004)  “Quad Orthogonal Transfer Array” –

8K x 8K prototype to test new CCDs, controllers, software

Uses 4 OTAs – each is 4Kx4K

16”

Diagonal ~22.5 inches; Corrector ~26 inches diam

motivation excellent image quality over 1
Motivation:Excellent Image Quality Over 1°
  • WIYN produces great images
  • WIYN has a natural 1° field of view
  • Based on Tip/Tilt Performance at WIYN (Claver)
    • Tip/tilt improves seeing by ~15% in FWHM (typically about 0.14”)
    • RIZ medians become ~ 0.52”, 0.43”, 0.35”
    • Atmosphere decorrelates at 2 arcmin: degrades 0.32” images 10%
orthogonal transfer array ota
Orthogonal Transfer Array (OTA)

OTCCD pixel

structure

OTA:

8x8 array of OTCCDs

Basic OTCCD cell

summary of ota properties
Summary of OTA Properties
  • 64 independent 480x494 CCDs
    • Individual addressing of CCDs
    • 2 arcmin field of view at LSST
    • Bad columns confined to cells
    • Point defects are tolerated
  • Cells with bright stars  guide stars, or read fast, up to 30 Hz, to avoid blooming, or for time studies
  • 8 video channels – 2s readout
  • Intercell gaps (0.1-0.3 mm; 1-3”); dithering required
  • Inter-OTA spacings: ~2 mm (20”)

5cm

12 um pixels = 0.11” at WIYN

quota and odi orthogonal transfer ccd arrays
QUOTA and ODI:Orthogonal Transfer CCD Arrays

A collaborative effort between:

  • MIT Lincoln Laboratory (Burke)
  • Semiconductor Technology Associates (Bredthauer)
  • Univ of Hawaii / PanSTARRS (Tonry, Luppino)
  • WIYN Observatory (Jacoby)
  • Univ of Arizona / Imaging Technology Laboratory (Lesser)
optic the ota s ancestor
OPTIC: The OTA’s Ancestor
  • CCD Format
    • 2 – 2Kx4K OT CCDs
    • 4 high-speed read zones
    • 4 science zones
  • Example – 300s R-band image
    • 3 of 4 guide regions selected
    • Read at 10-50 Hz
    • Tip/tilt correct remaining pixels
optic a time domain application
OPTIC: A Time Domain Application
  • Quick readout of selected regions
  • Enables the 10-50 Hz time domain for CCDs
  • Example – planet transits
    • 0.3s samples binned to 60s
    • Relativeaccuracy ~ 6E-4
    • Approaches HST (1E-4)

Planet Transit

sta ccd array configuration
STA CCD Array Configuration
  • 8x8 Array of elements
  • 480 x 494 Subcells allow for increased busing area
  • 3840 x 3952 pixels per OTA
  • 336μ x 132μ streets (30x11 pix)

49.48 mm

packaging
Packaging
  • Designed by G. Luppino and M. Lesser
  • Fabricated by Kyocera; being assembled by Luppino
handling
Handling
  • Provides safe handling
  • Allows for rapid installation and testing of OTA
quota and odi1
QUOTA and ODI

ODI (2005)  32K x 32K Array -- Uses 64 OTAs

QUOTA (2004)  “Quad Orthogonal Transfer Array” –

8K x 8K prototype to test new CCDs, controllers, software

Uses 4 OTAs – each is 4Kx4K

16”

Diagonal ~22.5 inches; Corrector ~26 inches diam

detector development status
Detector Development Status
  • Foundry run started in Jan 2004; all wafers received in August
  • Divided lot into 3 silicon groups to guard against flaws
    • 8 wafers of ~30 -cm material (thin to ~15 m)
    • 8 wafers of ~150 -cm material (thin to ~23 m)
    • 8 wafers of ~5000 -cm material (thin to ~45 m)
  • Under evaluation, revealing problems in logic:
    • Logic not switching cleanly – current leakage is occurring. (Similar problems with MIT/LL devices, too)
  • Good news
    • The “going-in” worry (4-phase design for OT) was non-issue! We have only OTCCDs outside of Lincoln!
    • Lincoln/PanSTARRS test devices work – revolutionary concept of an OTA has been proven.
    • Yields are ~70% (before thinning and packaging)
    • J. Tonry has offered to explore running our CCDs
sta dalsa 6 inch wafers
STA/Dalsa 6-inch Wafers

800x1200 pixels

2 OTAs, STA LogicDesign

1 OTA, Lincoln Logic Design

2X USNO CCDs 1Kx2K

2600x4000 pixels 12 microns

Great for spectroscopy applications

expected device properties
Expected Device Properties
  • Pixel rates > 0.7 Mpix/s (readout of array in 3 seconds)
  • Read noise 6-8 e- (degraded by long video lines on chip)
  • Pixel size is 12 m; MITLL also running 10 m pixels
  • Thinning depends on resistivity (thus, so does QE, MTF vs )
  • Blooming is different than usual CCD with channel stops – “puddling” of charge instead of trails is cosmetically cleaner
quota and odi timelines
QUOTA and ODI Timelines
  • Ramp-up of personnel (mechanical engineering, programmers): now
  • Conceptual Design Review (CoDR) for ODI: Dec 16-17
  • QUOTA purchases (dewar, filters, shutter, CryoTiger): March 2005
  • Second foundry run completes: April 2005
  • ODI PDR: Sept 2005
  • QUOTA integration: Dec 2005
  • QUOTA commissioning: Mar 2006
  • ODI details available, but commissioning: mid-2008
conceptual design review

Corrector Element #1

Dewar & Window (Corr Element #3)

ADC + Corr Element #2

Filters

Shutter

Dewar

Conceptual Design Review
  • In October 2003, Board asked for CoDR within a year
odi optical system
ODI Optical System

Fused Silica

  • Basic design is complete, toleranced, and mechanically analyzed

Element 3

Element 2

Element 1

Filter

Focal Plane

ADC: fused silica + LLF6HT

deflection of dewar window under 6000 lbs of atmospheric force
Deflection Of Dewar WindowUnder 6000 Lbs of Atmospheric Force
  • .0028” (71 microns) deflection at center
detector development demonstration
Detector Development - Demonstration

Example of an image using an MIT/LL OTA showing the controller board at Hawaii. Image provided by John Tonry. Concept of OTA is demonstrated.

detectors next steps
Detectors: Next Steps
  • Package thick OTA
  • Continue testing and evaluation at Hawaii and WIYN
  • If usable at all, test single OTA on telescope (0.9m)
  • Begin Phase II of CCD contract – for a half-lot of wafers with design revisions (12 wafers  36 OTAs)
    • Plan minimum changes that yield science-grade OTAs
    • Estimated cost $100K
    • Estimated turnaround is 3-4 months
  • We have 8 promising 2600 x 4000 pixel CCDs for Bench, Future Echelle, KPNO, IU, SALT – cost recovery possible
wiyn in 5 years
WIYN in 5 Years
  • Hydra on Fixed Port
  • ODI on other Fixed Port
  • Cass Port (in service for 2 years)
    • Yale dual-beam slit spectrograph (in commissioning)
    • Densepak
    • Sparsepak?
  • New Port (“folded cass”)
    • WHIRC on WTTM
    • Densepak?
    • Small university instruments
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