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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


Whirc summary w iyn h igh r esolution i nfra r ed c amera
WHIRC SummaryWIYN High Resolution InfraRed Camera



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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