Abstract. Preface. Acknowledgments
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1 Contents Abstract Preface Acknowledgments iv v vii 1 Introduction A Very Brief History of Visible Detectors in Astronomy The CCD: Astronomy s Champion Workhorse CCD Operation Drawbacks of the CCD in Astronomy Where the CCD Wins in Astronomy CMOS: Motivation for a New Detector Overview of CMOS Imager Operation Monolithic CMOS Imagers Hybrid CMOS Imagers Advantages of CMOS Arrays for Astronomy Disadvantages of CMOS Arrays in Astronomy Overview of Silicon PIN Detectors PIN Diodes General Discussion of PIN Diodes PIN Diode Circuit Equivalent Model Punch Trough Voltage HyViSI Detector HyViSI PIN Diode The HyViSI Pixel ix
2 3 Hybrid Imager Features Full Frame Mode Up the Ramp Terminology Window Mode Variation of Multiple Window Readout Sequences Guide Mode Reference Pixels Readout Electronics: SIDECAR ASIC Pre-Amplification Stage Conversion Gain Averaging Multiple Channels Noise Performance vs. Pixel Time Reference Voltages for SIDECAR when Connected to an HxRG Laboratory Testing of SiPIN Detectors Description of Laboratory Setups and Devices Tested Pixel Classification and Operability Dead or Railed Pixels Hot Pixels Open Pixels Volcanoes Summary of Pixels Conversion Gain and Nodal Capacitance Contributions to the Gain Electronics Gain G AMP & G A/D Unit Cell Source Follower Gain G UC Output Source Follower Gain G OUT Net Conversion Gain G NET Nodal Capacitance G P IXEL Results for HyViSI Detectors Read Noise Sources of Read Noise in Hybrid CMOS Detectors Noise Reduction Techniques HyViSI Measurements Dark Current Sources of Dark Current Estimating Dark Current HyViSI Dark Currents x
3 4.5.4 Reset Anomaly in HyViSI Quantum Efficiency PIN Diode Quantum Efficiency HyViSI Detective Quantum Efficiency (DQE) Linearity/Well Depth Sources of Nonlinearity in HyViSI Detectors Measurements of Nonlinearity in HyViSI Detectors HyViSI Well Depths Silicon PIN Detectors in Astronomy Observations with the Kitt Peak 2.1m Telescope Data Reduction and Calibration Data Reduction Theory Reference Pixel Correction Dark Subtraction Slope Fitting Flat Fielding Combining Dithers Telescope Calibration with Multiple Windows Expected Point Spread Function Photometry Aperture Photometry Crowded Field Photometry High Speed Photometry with Guide Windows Variability Measurements of BE Lyn Astrometry Sources of Astrometric Error Astrometric Reduction Astrometric Results with H2RG and H1RG Astrometric Results with H4RG Telescope Guiding in Guide Mode Purpose of Experiment Results without Guide Mode Results with Guide Mode Comparison between Exposures with and without Guide Mode Saturated Pixels Summary of Results Discussion xi
4 5.6 Near Infrared Response Pixel and Electronic Crosstalk Pixel Crosstalk Mechanisms of Pixel Crosstalk Measurement via Cosmic Rays Measurement via Fe Measurement via Single Pixel Reset Electronic Crosstalk Column Bleeding Output Coupling Persistence in HyViSI Detectors Trap Theory Hole Capture and Release from Shallow Traps Hole and Electron Capture from Deep Level Traps Latent Images and Persistence Persistent Charge Emission Dependence on Flux and Fluence Dependence on Detector Activity Dependence on Temperature Dependence on V SUB Semi-Permanent Offsets: Laser Burn-In Effect of Forward Biasing Theory of Bias-Direction Switch Forward Bias to Full Reverse Bias of V SUB = 15V Incrementing Reverse Bias with V SUB = 2V Model, Simulations, and Summary Phenomenological Description Persistence Simulations Summary Dealing with Persistence Persistence Reduction by Design Reduction After Design A Data Reduction 222 A.1 IRAF Parameters B Signal to Noise Ratio 223 xii
5 C Numerical Simulations 224 C.1 PN Junctions C.2 Basic Semiconductor Physics C.3 Numerical Methods: Finite Volume Scheme C.4 Results for Abrupt PN Junction C.5 Cylindrically Symmetric Persistence Simulations D Conversion Gain Reference 236 Bibliography 238 xiii
6 List of Tables 3.1 C F AC Values for Individual Detectors SIDECAR Conversion Gain Table SIDECAR Clocking Table for Averaging Multiple Channels SIDECAR Operating Parameters at Different Sampling Rates HyViSI Detectors Tested in the Laboratory Pixel Type Fractions for HyViSI Detectors Tested Fe 55 Lines from Radioactive Decay Conversion Gains, Nodal Capacitances, and Well Depth of HyViSI Devices HyViSI Well Depths Details for Observing Runs at Kitt Peak 2.1m Telescope Filter Characteristics Measured Magnitude for Landolt Standards Magnitude Transformation Equations for Landolt Standards Parameters from M13 Exposures Variability Parameters for the Delta Scuti Star BE Lyn Comparison of Astrometric Error with and without Guiding Comparison of Guide Mode vs. No Guiding Pixel Crosstalk Parameters for H2RG Parameters for Core-Halo Simulation xiv
7 List of Figures 1.1 Multi-Color Image of M13 Globular Cluster Taken with HyViSI H4RG Simple Diagram of a 4 4 CCD Illustration of the Process of Clocking in a CCD Cartoon of CCD Destructive Readout Simplified Diagram of Passive and Active CMOS Pixel Architecture Simplified Diagram of CMOS Multiplexer and 3T Pixel Diagram of Per-Pixel Depleted and Fully Depleted Hybrid CMOS Arrays Diagram of PIN Diode Circuit Equivalent of a PIN Diode Resistivity of Silicon as a Function of Doping Density Image and Cross Section Diagram of HyViSI detector Diagram of PIN Diodes in a HyViSI Detector PIN Diode Quantities for Backside Voltage V SUB = 0 10V PIN Diode Quantities for Backside Voltage V SUB = 15 35V A Mock Schematic of the Full HyViSI Pixel PIN Diode as Capacitor During and After Reset HyViSI Pixel Circuit Equivalent Lateral Diffusion and Blooming in an Undepleted Detector Ramp Sequence Diagram and Clocking Patterns for HxRG Multiplexers Window Mode Diagram Signal of Science and Reference Pixels for H1RG-022 with no C F AC Difference of Science and Reference Pixels for H1RG Slope Error with C F AC Difference of Science and Reference Pixels for H1RG-022 after Applying C F AC SIDECAR ASIC Block Diagram and Photograph SIDECAR ASIC Development Kit in RIT Laboratory SIDECAR Amplification Stage xv
8 3.10 SIDECAR Noise Images: Reset Schemes SIDECAR Conversion Gain Multiple Channels Averaged in SIDECAR Read Noise of H1RG-022 with Multiple Channels Averaged SIDECAR Images and Histograms with Non-ideal Operating Parameters Dewar Used at Rochester Imaging Detector Laboratory Flat Field Image Showing Open Pixels Diagram of Unit Cell, Bus Lines, and Output of H2RG Electronic Gain for H1RG Fe55 Histogram for H2RG Temperature Dependence of Conversion Gain with Constant V BIASGAT E Simplified Diagram of Noise Associated with Resetting Pixels Up the Ramp Exposure Diagram with Fowler Sampling CDS Read Noise Map for H2RG-001 at 100 K Temperature Dependence of CDS Read Noise for H2RG Read Noise vs. Fowler Pair and Temperature Dependence for H2RG Dark Current Histogram for H1RG Dark Current vs. Temperature for HyViSI Detectors Pixel Ramp Showing Reset Anomaly in H1RG Reset Anomaly at Different Reset Voltages Detective Quantum Efficiency of H4RG Fringing in Monochromatic Flat Field near 1 µm Photon Transfer Curves for H2RG with Output Source Follower Enabled Linearity of H2RG and H2RG-001 as a Function of Electrons Integrated on Nodal Capacitance Photograph of RIDL Dewar Mounted to Kitt Peak 2.1m Telescope Drift of Telescope from Sidereal Tracking Rate Expected Ellipticity and FWHM in Guiding and Unguided Operation Magnitude Plot for Landolt Photometric Standards M13 Color Magnitude Diagram in g and i M13 Color Magnitude Diagram in g and y Magnitude vs. Time for BE Lyn and Reference Star GSC Magnitude vs. Time for BE Lyn after Normalization by Reference Star and Filtering Astrometric Error vs. Exposure Time for H2RG Observations of Open Cluster NGC Long Time Exposure Taken with H1RG-022 with No Guiding xvi
9 5.11 Long Time Exposure Taken with H2RG in Guide Mode Comparison of Long Time Exposures With and Without Telescope Guiding Exposure Time Required to Reach Limiting Magnitude Interpixel Capacitance of Guide Window with Surrounding Pixels Tri-color Image of Orion Nebula Showing Near IR Response Cosmic Ray Ramps and Decay of Signal After Incidence Charge Lost by Pixel in 800 Seconds as a Function of Charge Deposited by Cosmic Ray Histograms of Time Constant c n in Cosmic Ray Decays for Different Temperatures Muon Track Showing Different Charge Loss at Opposing Ends Dependence of Charge Loss on Depth of Interaction for Extended Muon Tracks Cosmic Ray Pixels Sharing Charge No Coupling of Reference Pixels to Science Pixels During Cosmic Ray Event Examples of Single and Multiple Pixel Events from Fe 55 Exposure Examples of Fe 55 Distributions from Guess and Check Iteration Process Pixel Crosstalk vs. Temperature for H2RG Fe 55 Ramps Showing Charge Loss Pictorial Plot Showing Loss of Charge After Fe 55 Hit Shift and FWHM of Fe 55 Peak in temperature range Kelvin The Effect of Charge Loss on Fe 55 Spectrum at 170 K Pixel Crosstalk with Single Pixel Reset The Effect of Single Pixel Reset on Column Voltage Charge Diffusion and Persistence in Single Pixel Reset Experiments at Temperatures from K Signal Measured for Pixel Subject to Single Pixel Reset as a Function of V RESET Zoom-in of Signal Measured for Pixel Subject to Single Pixel Reset as a Function of V RESET Column Bleeding in Horsehead Nebula Mosaic Taken with H2RG Star Showing Column Bleeding and Threshold Output Coupling in Mosaic of SAO Taken with H2RG Output Coupling Circuit Diagram Output Coupling with No Source Follower Saturn: Saturated and Persistent Images Temporal and Spatial Evolution of Persistence Structure Diagram of Core-Halo Persistence Structure Ramps for Pixels in Region Surrounding Persistence Center xvii
10 7.5 Maximum Persistence Signal in 14 Second Exposure Minimum Persistence Signal in 14 Second Exposure Decay of Dark Current in Core-Halo Persistence Histograms of Time Constants for Latent Image Decays Latent Image Lasting More than One Hour Pixel Ramp Showing Reset Anomaly in H1RG Latent Images at Different Values of V SUB Stored and Excess Hole Populations Under Saturation in Undepleted Detector Semi-Permanent Offset in H2RG Burned in by Mars Month Decay of Laser Burn-In on H2RG Dark Current after Forward Bias and Return to Reverse Bias in H1RG Dark Current after Increasing V SUB in H1RG Toy Model of Charge Density, Electric Field, and Electric Potential in PIN Diode Drift and Diffusion Currents Responsible for Negative Persistence Comparison of Ramps and Radial Profiles for Simulated Persistence and Real Data Comparison of Simulated Hole and Electron Distributions with and without Drift Dither Sequence Showing Persistence in all Dither Locations C.1 PN Junction Diagram C.2 Results for PN Junction with No Applied Bias C.3 Results for PN Junction Under Reverse Bias xviii
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