Pocket Pumped Image Analysis Ivan Kotov Brookhaven National Laboratory
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1 Pocket Pumped Image Analysis Ivan Kotov Brookhaven National Laboratory Instrumentation Division Seminar November 13,
2 CCD Readout Architecture Terms Charge motion Image area (exposed to light) Parallel (vertical) registers Pixel Serial (horizontal) register Output amplifier Charge motion Instrumentation Division Seminar November 13,
3 POCKET PUMPED IMAGE, ds9 viewer
4 Trap identification. Amplitude distribution. Leveling the field (Base Line subtraction)
5 Trap identification. Amplitude distribution
6 Trap identification. Amplitude-Amplitude plot
7 Trap identification. Amplitude-Amplitude plot
8 Trap identification. Correlator the parabolic shape is expected for amplitude dependence since amount of charge lost in one pixel is equal to amount of charge gained by another pixel and
9 Trap count
10 Trap count
11 Trap catalog
12 POCKET PUMPED IMAGE. CONCLUSION Trap identification technique has been developed. This technique works on pocket pumped images. traps can be counted in individual columns, rows etc trap location can be reported as well, for example, trap catalog can be generated
13 Back up slides
14 ,. Transformations The selection of trap bands in the amplitude scatter plot can be simplified using coordinate system transformation. The useful transformation is rotation by 45 degree
15 Transformations,.
16 CCD Phased Clocking: Step V 0V -5V +5V 0V -5V +5V 0V -5V Time-slice shown in diagram Instrumentation Division Seminar November 13,
17 CCD Phased Clocking: Step V 0V -5V +5V 0V -5V +5V 0V -5V Instrumentation Division Seminar November 13,
18 CCD Phased Clocking: Step V 0V -5V +5V 0V -5V +5V 0V -5V Instrumentation Division Seminar November 13,
19 Charge Transfer Efficiency CTE = Charge Transfer Efficiency (typically to ) = fraction of electrons transferred from one pixel to the next CTI = Charge Transfer Inefficiency = 1 CTE (typically 10 6 to 10 4 ) = fraction of electrons deferred by one pixel or more Cause of CTI: charges are trapped (and later released) by defects in the silicon crystal lattice CTE of used to be thought of as pretty good but. Think of a 2K x 0.5K CCD segment Instrumentation Division Seminar November 13,
20 The Wallet Card Three Mirror Anastigmat (TMA) optical design. 8.4 meter primary, 6.5 meter effective aperture 3.4 meter diameter secondary 5 m tertiary is being fabricated in same substrate as primary mirror three-element refractive corrector f/1.2 beam delivered to camera 9.6 square degree field (on science imaging pixels) optics deliver < 0.2 arcsec FWHM spot diagram, 6 filters: ugrizy: 320 nm to 1050 nm (UV atmospheric cutoff to Si bandgap) 3.0 Gpixel camera 10 micron pixels, 0.2 arcsec/pixel Deep depletion (100 mm), high-resistivity CCDs for NIR response Dual 15 second exposures (to avoid trailing of solar system objects) 2 second readout (trade between noise and imaging efficiency) 550 kpix/sec through 16 amps/ccd x 189 CCDs = 3024 channels 12 GBytes per image (as floating point numbers), 20 TBytes/night. Real-time frame subtraction for time domain alerts, ~850 visits for each patch of sky, allows co-adds to r ~ 27 (AB), over 18,000 square degrees. Instrumentation Division Seminar November 13,
21 Camera 3.2 Gigapixels 0.2 arcsec pixels 9.6 square degree FOV 2 second readout 6 filters 1.65 m Parameter Value Diameter 1.65 m Length 3.7 m Weight 3000 kg F.P. Diam 634 mm Instrumentation Division Seminar November 13,
22 Primary/Tertiary in Fabrication, completion in 2014 Instrumentation Division Seminar November 13,
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