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Fusion neutron damage to a charge coupled device camera

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Published by Naval Postgraduate School, Available from National Technical Information Service in Monterey, Calif, Springfield, Va .
Written in English


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A charge coupled device (CCD) camera"s performance has been degraded by damage produced by 14 MeV neutrons (n) from the Rotating Target Neutron Source. High energy neutrons produce atomic dislocation in doped silicon electronics. This thesis explores changes in Dark Current (J), Charge Transfer Inefficiency (CTI), and Contrast Transfer Function (CTF) as measures of neutron damage. The camera was irradiated to a fluence, Phi, of 6.60 x 10 (exp 12) n/ cm2. The camera temperature was lowered from room temperature to 267 K at a fluence of 4.7 x 10 (exp 11) n/cm2 to preclude saturation of the camera picture. With temperature compensations, J increased linearly with Phi. Four data points for J, CTF (ideal of 1.0), and CTI (ideal of 0.0) are given. Neutron irradiation significantly degraded the CCD camera performance; however, operating the camera at lower temperatures significantly reduces the effects. Damage thresholds for fluences greater than 6.60 x 10 (exp 12) n/cm2 and for all temperatures can be extrapolated from the results of this work.

Edition Notes

StatementChristopher D. Amaden
The Physical Object
Paginationxi, 40 p. ;
Number of Pages40
ID Numbers
Open LibraryOL25295223M

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Calhoun: The NPS Institutional Archive Theses and Dissertations Thesis Collection Fusion neutron transient effects to charge coupled device camera images. Approved for public release; distribution is unlimitedA charge coupled device (CCD) camera's images were degraded by neutron-induced blemishes, called stars, while being irradiated with 14 MeV neutrons (n) from the Rotating Target Neutron Source. This thesis analyzed simulated images for a CCD camera operating during neutron : Michael S. Giauque. Fusion neutron damage to a charge coupled device camera. (CTF) as measures of neutron damage. The camera was irradiated to a fluence, Phi, of x 10 (exp 12) n/ cm2. The camera temperature was lowered from room temperature to K at a fluence of x 10 (exp 11) n/cm2 to preclude saturation of the camera picture. Charge Coupled Author: Christopher Dean Amaden.   A charge-coupled device (CCD) is widely used as a detector of vacuum spectrometers in fusion devices. Recently, a deuterium plasma experiment has been initiated in a Large Helical Device (LHD). Totally × 10 18 neutrons have been yielded with energies of MeV (D-D) and MeV (D-T) during the deuterium experiment over four months.

We report on D-D fusion neutron emission in a plasma device with an energy input of only J, within a range where fusion events have been considered very improbable. Proton induced charge transfer efficiency (CTE) degradation has been studied in the large format charge-coupled device (CCD) flight-like candidates for Wide Field Camera 3 for the Hubble Space.   This paper presents a review of the current state-of-the-art neutron spectroscopy in fusion research. The focus is on the fundamental nuclear physics and measurement principles. A brief introduction to relevant nuclear physics concepts is given and also a summary of the basic properties of neutron emission from a fusion plasma. Compact monitors/spectrometers like diamond, CLYC and . The neutron source is a customized deuterium-deuterium neutron generator that produces neutrons at MeV by the fusion reaction H(d, n)He at a calculated flux of 7 × 10 ± 30% s.

  An intermediate and complementary facility, referred to as Sorgentina, has been proposed by ENEA with the aim of utilizing a D–T fusion neutron source to create a reference MeV data library to qualify and validate irradiations performed through different neutron spectra, performing screening for material damage. working on smaller plasma devices, it is expected that this conference will, as in the past, serve to identify possibilities and means for continuous and effective international collaboration in this area. The 26th IAEA Fusion Energy Conference is being organized by the IAEA in coop-eration with the National Institute for Fusion Science, Japan.   The neutron damage constant for leakage current of the Si-SBD was found to be × 10 −9 nA/n/cm 2 for DT neutrons and × 10 −9 nA/n/cm 2 for DD neutrons. And the correlation factor of the DT and DD neutron damage for the Si-SBD was determined from the ratio of each damage constant and was found to be A charge coupled device (CCD) camera's images were degraded by neutron-induced blemishes, called stars, while being irradiated with 14 MeV neutrons (n) from the Rotating Target Neutron Source.