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Title: Properties of tree rings in LSST sensors

Abstract

Images of uniformly illuminated sensors for the Large Synoptic Survey Telescope have circular periodic patterns with an appearance similar to tree rings. Furthermore, these patterns are caused by circularly symmetric variations of the dopant concentration in the monocrystal silicon boule induced by the manufacturing process. Non-uniform charge density results in the parasitic electric field inside the silicon sensor, which may distort shapes of astronomical sources. Here, we analyzed data from fifteen LSST sensors produced by ITL to determine the main parameters of the tree rings: amplitude and period, and also variability across the sensors tested at Brookhaven National Laboratory. Tree ring pattern has a weak dependence on the wavelength. But the ring amplitude gets smaller as wavelength gets longer, since longer wavelengths penetrate deeper into the silicon. Tree ring amplitude gets larger as it gets closer to the outer part of the wafer, from 0.1 to 1.0%, indicating that the resistivity variation is larger for larger radii.

Authors:
 [1];  [2];  [3]
  1. Stony Brook Univ., NY (United States); Brookhaven National Lab. (BNL), Upton, NY (United States)
  2. Brookhaven National Lab. (BNL), Upton, NY (United States)
  3. Stony Brook Univ., 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) (SC-25)
OSTI Identifier:
1392233
Report Number(s):
BNL-114246-2017-JA
Journal ID: ISSN 1748-0221
Grant/Contract Number:  
SC0012704
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Journal of Instrumentation
Additional Journal Information:
Journal Volume: 12; Journal Issue: 05; Conference: Precision Astronomy with Fully Depleted CCDs, Upton, NY (United States), 01-02 Dec 2016; Journal ID: ISSN 1748-0221
Publisher:
Institute of Physics (IOP)
Country of Publication:
United States
Language:
English
Subject:
79 ASTRONOMY AND ASTROPHYSICS; detectors for UV; visible and IR photons; photon detectors for UV; systematic effects

Citation Formats

Park, H. Y., Nomerotski, A., and Tsybychev, D.. Properties of tree rings in LSST sensors. United States: N. p., 2017. Web. doi:10.1088/1748-0221/12/05/C05015.
Park, H. Y., Nomerotski, A., & Tsybychev, D.. Properties of tree rings in LSST sensors. United States. doi:10.1088/1748-0221/12/05/C05015.
Park, H. Y., Nomerotski, A., and Tsybychev, D.. Tue . "Properties of tree rings in LSST sensors". United States. doi:10.1088/1748-0221/12/05/C05015. https://www.osti.gov/servlets/purl/1392233.
@article{osti_1392233,
title = {Properties of tree rings in LSST sensors},
author = {Park, H. Y. and Nomerotski, A. and Tsybychev, D.},
abstractNote = {Images of uniformly illuminated sensors for the Large Synoptic Survey Telescope have circular periodic patterns with an appearance similar to tree rings. Furthermore, these patterns are caused by circularly symmetric variations of the dopant concentration in the monocrystal silicon boule induced by the manufacturing process. Non-uniform charge density results in the parasitic electric field inside the silicon sensor, which may distort shapes of astronomical sources. Here, we analyzed data from fifteen LSST sensors produced by ITL to determine the main parameters of the tree rings: amplitude and period, and also variability across the sensors tested at Brookhaven National Laboratory. Tree ring pattern has a weak dependence on the wavelength. But the ring amplitude gets smaller as wavelength gets longer, since longer wavelengths penetrate deeper into the silicon. Tree ring amplitude gets larger as it gets closer to the outer part of the wafer, from 0.1 to 1.0%, indicating that the resistivity variation is larger for larger radii.},
doi = {10.1088/1748-0221/12/05/C05015},
journal = {Journal of Instrumentation},
number = 05,
volume = 12,
place = {United States},
year = {Tue May 30 00:00:00 EDT 2017},
month = {Tue May 30 00:00:00 EDT 2017}
}

Journal Article:
Free Publicly Available Full Text
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