An Unexpected Hysteresis Effect Seen in Hawaii-2RG Detectors

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Presentation transcript:

An Unexpected Hysteresis Effect Seen in Hawaii-2RG Detectors Background Distortion calibration important for JWST Coronagraphy, MSA, slits Self-calibration will be difficult ACS field observed in 2006 In LMC, in JWST’s CVZ 55: big enough for all detectors Good density of stars Many well-measured stars More than 100,000 good to 1 mas Good, but… Not big enough for cross-calibration No IR color information 17" Jay Anderson --- TIPS Feb 21, 2008 J1

Ground-based Observations HAWK-I: new IR camera Being commissioned on VLT at Paranal 7.57.5 FOV 22 mosaic of 20482048 NIR detectors “Active optics” Luigi Bedin (STScI) observed the JWST field For them: exquisite distortion solution For us: IR photometry & larger field We got an additional benefit… Jay Anderson --- TIPS Feb 21, 2008 J2

HAWK-I distortion: After global correction: Raw residuals One chip J3 x x One chip x x x x x x Jay Anderson --- TIPS Feb 21, 2008 J3

Periodic residuals Same throughout detector Periodogram Square wave Phase Diagram Phase Diagram Same throughout detector Periodogram Square wave removes periodic signature Jay Anderson --- TIPS Feb 21, 2008 J4

Why do we care? Rockwell Scientific HAWAII-2RG Very important to Prototype for JWST! Very important to understand the source Geometric, like HST? WFPC2’s 34-row effect ACS/WFC’s 68-column effect Check flat fields No evidence WFC FLAT FIELDS HAWK-I Jay Anderson --- TIPS Feb 21, 2008 J5

Why do we care? Rockwell Scientific HAWAII 2RG 32 amplifiers  AMP#0 AMP#1 AMP#2 AMP#3 AMP#4 Rockwell Scientific HAWAII 2RG Prototype for JWST! Very important to understand the source Geometric? No! Readout artifact? HAWK-I Readout CTE-like hysteresis PSF asymmetry? Look at CRs… Likely cause pixel dwell time All CRs Even Amps Odd Amps inter-pixel capacitance Jay Anderson --- TIPS Feb 21, 2008 J6

Possible Implications for JWST JWST will have four amplifiers four 512-pixel zones Not clear if effect comes before or after the amplifiers… Really a problem? How to deal with hysteresis? Mild deconvolution? (will amplify noise) Leave in, but model Similar to the inter-pixel capacitance Effective PSF will treat it implicitly as (x,y) Need to study impact on: subarray mode, guider, spectra, dithering, noise model Early NIRCam/U.AZ tests encouraging! Jay Anderson --- TIPS Feb 21, 2008 J7

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