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May 19, 2009JWST Partner's Workshop1 NIRCam Status Marcia Rieke University of Arizona JWST Partner’s Workshop Ottawa, Canada May 19, 2009 JWST-PRES-012902.

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Presentation on theme: "May 19, 2009JWST Partner's Workshop1 NIRCam Status Marcia Rieke University of Arizona JWST Partner’s Workshop Ottawa, Canada May 19, 2009 JWST-PRES-012902."— Presentation transcript:

1 May 19, 2009JWST Partner's Workshop1 NIRCam Status Marcia Rieke University of Arizona JWST Partner’s Workshop Ottawa, Canada May 19, 2009 JWST-PRES

2 May 19, 2009JWST Partner's Workshop2 Read Noise with ASICs A set consisted of sample ramps. Data taken using development unit ASICs and Qual FPA

3 May 19, 2009JWST Partner's Workshop3 How to Use Subarrays An open question in using the subarray readout mode is whether special calibrations are needed for each subarray location and size or whether data can be extracted from full frame data. For 2-sample (CDS) data, we may recommend taking darks before the exposure –SCAs run from an ASIC may not have the reset anomaly that we see running in buffered mode w/ a Leach controller Reference pixels do not provide any benefit. –Again need to be careful about possible ASIC vs Leach or buffered vs unbuffered mode caveats Flats can be used from full frame data. no ref pix corr ref pix corr

4 May 19, 2009JWST Partner's Workshop4 Illuminated Subarrays Arrays run simultaneously so LED variations are seen in all. NIRCam will use a subarray or “window” readout mode to extend dynamic range. It may be the principal mode for observing transits by extra-solar planets. A 128x128 subarray was used with four SCAs (two shown here) in our test dewar. Illumination was provided by 2micron LED, and a series of 2-sample ramps were taken.

5 May 19, 2009JWST Partner's Workshop5 Subarray Flatfielding Gray scale and plot show the result of ratioing subarray to full frame data. Neither image was linearity-corrected. The variations of +/-2% agree with expectations from counting statistics. Full frame flats appear to be fine for use with subarrays.

6 May 19, 2009JWST Partner's Workshop6 C038 C045 C044 C043 FM1 Dark (black is good) B1 B3 B4B2 B1 B3 B4B2 FM1 Illuminated (white is good) Red box is coronagraphy field. Flight Short Wavelength FPAs are in Assembly

7 May 19, 2009JWST Partner's Workshop7 C074 C105 C104 C101 A4 A2 A1 A3 FM2 Dark (black is good) FM2 Illuminated (white is good) Red box is coronagraphy field.

8 May 19, 2009JWST Partner's Workshop8 Flight Wide Filters Plot below shows the transmission functions for the flight candidates. Dashed line is the requirement. Out of band blocking is also excellent. Req.

9 May 19, 2009JWST Partner's Workshop9 ETU Optic Test Pupil Wheel Config FWA ETU Optic Test PW2 – FLAT FIELD PINHOLES PW3 – Uncoated Fused Silica PW10 – Uncoated Fused Silica PW11 – WEAK LENS - 6 PW12 – ETU DHS 2 PW1 – CIRCULAR APERTURE PW9 – WEAK LENS - 7 PW7 – FILTER SURROGATE PW6 – DHS MASS SURROGATE PW4 – FILTER SURROGATE PW8 – OUTWARD PINHOLES PW5 – FILTER SURROGATE

10 May 19, 2009JWST Partner's Workshop10 ETU Optic Test Filter Wheel Config FWA ETU Optic Test FW8 – FILTER F187N FW12 – DHS FILTER F150W2 FW11 – FILTER F070 FW9 – IMAGING PUPIL FW1 – FILTER SURROGATE FW10 – FILTER SURROGATE FW7 – WEAK LENS - 8 FW3 – FILTER F115W FW4 – FILTER F070W FW5 – FILTER F200W FW6 – FILTER F212N FW2 – FILTER SURROGATE Optics used in acceptance test

11 May 19, 2009JWST Partner's Workshop11 DHS Element in ETU Pupil Wheel

12 May 19, 2009JWST Partner's Workshop12 Precision alignment and KOH bonding of ETU PIL optics is complete Assembly is being integrated with mechanism for further environmental tests ETU Pupil Imaging Lens Assembly

13 May 19, 2009JWST Partner's Workshop13 ETU Short Wave Fold Mirror Assembly WFE Pre-Vibe: 11.4 nm rms WFE Post-Vibe: 11.8 nm rms Vibration ConfigurationSWFM Assembly

14 May 19, 2009JWST Partner's Workshop14 ETU SWFM Cryo-cycling Results Mirror exceeded spec in first Cycle, then maintained acceptable surface figure through Cycles 2 and 3 Note: chart shows only data points taken at points of thermal equilibrium Requirement 17.8 nm (CA) Bottom of 3 rd Cycle: 13.8 nm rms

15 May 19, 2009JWST Partner's Workshop15 Progress on Wavefront Error Recall that the NIRCam optical train as first realized in the Pathfinder did not meet its wavefront error requirement. Several causes were identified: 1) Mount-induced distortion 2) Coating-induced distortions 3) Poor alignment of lenses within a triplet An improved alignment scheme is helping, and the coating problem has been traced to thermal shock at JDSU. A new bonded mount design is the last improvement.

16 May 19, 2009JWST Partner's Workshop16 Short Wave Bonded ZnSe Singlet “Optic Saver” Standoff

17 May 19, 2009JWST Partner's Workshop17 Surface figure cooldown of SW ZnSe S1 Surf fig rms = 2.85nm Zernike coeffs for surface S1 deformation (mm) N M A(N,M) E-10 { Piston E-10 { X-tilt E-09 { Y-tilt E-09 { Astigmatism E-06 { Focus shift E-09 { Astigmatism 0 or E-11 { Trefoil Y E-08 { Coma 3rd ord Y E-09 { Coma 3rd ord X E-06 { Trefoil X E-09 { Tetrafoil Y E E-07 { Spherical 3rd + Focus E E-09 { Tetrafoil X E-09 { Pentafoil Y E E-09 { Coma 5th ord Y E-09 { Coma 5th ord X E E-10 { Pentafoil X E-09 { Hexafoil Y E E E-08 { Spherical 5th + 3rd + Focus E E E-06 { Hexafoil X

18 May 19, 2009JWST Partner's Workshop18 Surface figure cooldown of SW ZnSe S2 Surf fig rms = 2.74nm Zernike coeffs for surface S2 deformation (mm) N M A(N,M) E-10 { Piston E-10 { X-tilt E-10 { Y-tilt E-09 { Astigmatism E-06 { Focus shift E-09 { Astigmatism 0 or E-10 { Trefoil Y E-07 { Coma 3rd ord Y E-08 { Coma 3rd ord X E-06 { Trefoil X E-10 { Tetrafoil Y E E-07 { Spherical 3rd + Focus E E-10 { Tetrafoil X E-10 { Pentafoil Y E E-09 { Coma 5th ord Y E-09 { Coma 5th ord X E E-11 { Pentafoil X E-09 { Hexafoil Y E E E-06 { Spherical 5th + 3rd + Focus E E E-06 { Hexafoil X

19 May 19, 2009JWST Partner's Workshop19 Differences in transmitted WFE in NIRCam SW Path at 2.0  m for 5 field points from cool-down mount-induced surface figure changes SW ZnSe lens rms = 2.08nm rms = 2.15nm rms = 2.09nm rms = 1.97nm rms = 2.48nm Prediction is 2.48 nm versus 8.02 budget allocation

20 May 19, 2009JWST Partner's Workshop20 Test Article Margin of Safety Tests Bonding Tests Epoxy samples for testing. Sample lens substrates with metal pucks attached have successfully been cryo-cycled to 16K Characterization of epoxy samples for CTE and other properties is underway Margin of safety test has been designed with testing to occur in June

21 May 19, 2009JWST Partner's Workshop21 ETU Build Flow Cold Alignment Cycle 1 Cold Alignment Cycle 2 Cold Alignment Cycle 3 Check Stability Nudge Install PIL, FPA Install Baffle Covers AT FPA & Wavefront Sensing Tests AT Module B Plug ‘n’ Play, Pt 1 AT TRR OMA Tolerance Review OMA Calibration Review WFE Review OMA Build OMA Calibration OMA TRR Warm Alignment Data Review Predict WFE, focus with OMA OMA Tolerance Analysis Predict WFE with p-SMART Module B Plug ‘n’ Play, Pt 2 p-SMART Test SFPA / SMART Metrology Alignment Plan Review Monte Carlo Analysis Review WFS Review Module Integration August  Delivery to GSFC in Oct.


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