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Timothee Greffe: Flat Field Forensics

tgreffe@caltech.edu
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Bizarre dips observed in variance curves for many e2v CCDs are explained by Tim for the first time. The Downing Dip and the Bilgi Bump each flag different subtle charge transport problems which could have severely impacted ZTF.
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  • links to Power point and PDF will go here
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  Date: Wednesday, July 5, 2017
Time: 12:30 pm PST
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Direct to Cahill 126: +1 626 395-8646
+1 626 395-8884
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Attending:
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Attending: COO crew, Alan Uomoto and Jorge fm Carnegie
Call-in: Greg Brethauer and co at STA
 

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  • Alan U. asks how it is that Bilgi Bump is restricted to a narrow wignal window without affecting lower fluxes. Roger: good question. We don't know.
  • Steve Kaye points out that a structural trap may empty when the clock is taken negative. Roger notes that charge could be pushed forwards (fm TG to serial register) or backwards. Coud the direction of travel be signal dependent?
  • Tim notes that we are looking into using an InGaAs camera to look at CCD electrodes through a microscope. One needs the near IR since Silicon becomes trasparent beyond 1 Ám.

 

Lyrics from Private Investigation by Dire Straights (1982)

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