DOE PAGES title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: A study of astrometric distortions due to “tree rings” in CCD sensors using LSST Photon Simulator

Abstract

Imperfections in the production process of thick CCDs lead to circularly symmetric dopant concentration variations, which in turn produce electric fields transverse to the surface of the fully depleted CCD that displace the photogenerated charges. We use PhoSim, a Monte Carlo photon simulator, to explore and examine the likely impacts these dopant concentration variations will have on astrometric measurements in LSST. The scale and behavior of both the astrometric shifts imparted to point sources and the intensity variations in flat field images that result from these doping imperfections are similar to those previously observed in Dark Energy Camera CCDs, giving initial confirmation of PhoSim's model for these effects. In addition, the organized shape distortions were observed as a result of the symmetric nature of these dopant variations, causing nominally round sources to be imparted with a measurable ellipticity either aligned with or transverse to the radial direction of this dopant variation pattern.

Authors:
 [1];  [2];  [1]
  1. Stony Brook Univ., Stony Brook, NY (United States)
  2. Brookhaven National Lab. (BNL), Upton, NY (United States)
Publication Date:
Research Org.:
Brookhaven National Laboratory (BNL), Upton, NY (United States)
Sponsoring Org.:
USDOE Office of Science (SC), High Energy Physics (HEP)
OSTI Identifier:
1221750
Report Number(s):
BNL-108352-2015-JA
Journal ID: ISSN 1748-0221; KA2301020; TRN: US1500737
Grant/Contract Number:  
SC00112704
Resource Type:
Accepted Manuscript
Journal Name:
Journal of Instrumentation
Additional Journal Information:
Journal Volume: 10; Journal Issue: 05; Journal ID: ISSN 1748-0221
Publisher:
Institute of Physics (IOP)
Country of Publication:
United States
Language:
English
Subject:
79 ASTRONOMY AND ASTROPHYSICS; CCD; tree rings; LSST; PhoSim

Citation Formats

Beamer, Benjamin, Nomerotski, Andrei, and Tsybychev, Dmitri. A study of astrometric distortions due to “tree rings” in CCD sensors using LSST Photon Simulator. United States: N. p., 2015. Web. doi:10.1088/1748-0221/10/05/C05027.
Beamer, Benjamin, Nomerotski, Andrei, & Tsybychev, Dmitri. A study of astrometric distortions due to “tree rings” in CCD sensors using LSST Photon Simulator. United States. https://doi.org/10.1088/1748-0221/10/05/C05027
Beamer, Benjamin, Nomerotski, Andrei, and Tsybychev, Dmitri. Fri . "A study of astrometric distortions due to “tree rings” in CCD sensors using LSST Photon Simulator". United States. https://doi.org/10.1088/1748-0221/10/05/C05027. https://www.osti.gov/servlets/purl/1221750.
@article{osti_1221750,
title = {A study of astrometric distortions due to “tree rings” in CCD sensors using LSST Photon Simulator},
author = {Beamer, Benjamin and Nomerotski, Andrei and Tsybychev, Dmitri},
abstractNote = {Imperfections in the production process of thick CCDs lead to circularly symmetric dopant concentration variations, which in turn produce electric fields transverse to the surface of the fully depleted CCD that displace the photogenerated charges. We use PhoSim, a Monte Carlo photon simulator, to explore and examine the likely impacts these dopant concentration variations will have on astrometric measurements in LSST. The scale and behavior of both the astrometric shifts imparted to point sources and the intensity variations in flat field images that result from these doping imperfections are similar to those previously observed in Dark Energy Camera CCDs, giving initial confirmation of PhoSim's model for these effects. In addition, the organized shape distortions were observed as a result of the symmetric nature of these dopant variations, causing nominally round sources to be imparted with a measurable ellipticity either aligned with or transverse to the radial direction of this dopant variation pattern.},
doi = {10.1088/1748-0221/10/05/C05027},
journal = {Journal of Instrumentation},
number = 05,
volume = 10,
place = {United States},
year = {Fri May 22 00:00:00 EDT 2015},
month = {Fri May 22 00:00:00 EDT 2015}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record

Citation Metrics:
Cited by: 6 works
Citation information provided by
Web of Science

Save / Share:

Works referenced in this record:

PhoSim: a code to simulate telescopes one photon at a time
journal, April 2014


Transverse electric fields' effects in the Dark Energy Camera CCDs
journal, April 2014


The Brighter-Fatter and other sensor effects in CCD simulations for precision astronomy
journal, May 2015


SExtractor: Software for source extraction
journal, June 1996

  • Bertin, E.; Arnouts, S.
  • Astronomy and Astrophysics Supplement Series, Vol. 117, Issue 2
  • DOI: 10.1051/aas:1996164

Physics of fully depleted CCDs
journal, March 2014


On-Sky Measurements of the Transverse Electric Fields’ Effects in the Dark Energy Camera CCDs
journal, July 2014

  • Plazas, A. A.; Bernstein, G. M.; Sheldon, E. S.
  • Publications of the Astronomical Society of the Pacific
  • DOI: 10.1086/677682

Works referencing / citing this record:

Sensor Distortion Effects in Photon Monte Carlo Simulations
journal, February 2020

  • Peterson, J. R.; O’Connor, P.; Nomerotski, A.
  • The Astrophysical Journal, Vol. 889, Issue 2
  • DOI: 10.3847/1538-4357/ab64e0

Sensor Distortion Effects in Photon Monte Carlo Simulations
text, January 2020