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Title: Design Considerations of a Slit Diaphragm Flexure Used in a Precision Mirror Gimbal

Abstract

Two precision mirror gimbals were designed using slit diaphragm flexures to provide two-axis precision mirror alignment in space-limited applications. Both gimbals are currently in use in diagnostics at the National Ignition Facility: one design in the Gamma Reaction History (GRH) diagnostic and the other in the Neutron Imaging System (NIS) diagnostic. The GRH gimbal has an adjustment sensitivity of 0.1 mrad about both axes and a total adjustment capability of ±6°; the NIS gimbal has an adjustment sensitivity of 0.8 μrad about both axes and a total adjustment range of ±3°. Both slit diaphragm flexures were electro-discharge machined out of high-strength titanium and utilize stainless steel stiffeners. The stiffener-flexure design results in adjustment axes with excellent orthogonality and centering with respect to the mirror in a single stage; a typical two-axis gimbal flexure requires two stages. Finite element analyses are presented for both flexure designs, and a design optimization of the GRH flexure is discussed.

Authors:
Publication Date:
Research Org.:
Nevada Test Site/National Security Technologies, LLC (United States)
Sponsoring Org.:
USDOE National Nuclear Security Administration (NNSA)
OSTI Identifier:
1055667
Report Number(s):
DOE/NV/25946-1272
DOE Contract Number:  
DE-AC52-06NA25946
Resource Type:
Conference
Journal Name:
Proceedings of the SPIE
Additional Journal Information:
Journal Volume: 8125; Conference: SPIE Conference; August 21-25, 2011; San Diego, CA
Country of Publication:
United States
Language:
English
Subject:
42 ENGINEERING; 70 PLASMA PHYSICS AND FUSION TECHNOLOGY; optomechanics, mirror, flexure, gimbal, NIF

Citation Formats

Cox, B. C., Kaufman, M. I. Design Considerations of a Slit Diaphragm Flexure Used in a Precision Mirror Gimbal. United States: N. p., 2011. Web. doi:10.1117/12.890913.
Cox, B. C., Kaufman, M. I. Design Considerations of a Slit Diaphragm Flexure Used in a Precision Mirror Gimbal. United States. doi:10.1117/12.890913.
Cox, B. C., Kaufman, M. I. Thu . "Design Considerations of a Slit Diaphragm Flexure Used in a Precision Mirror Gimbal". United States. doi:10.1117/12.890913.
@article{osti_1055667,
title = {Design Considerations of a Slit Diaphragm Flexure Used in a Precision Mirror Gimbal},
author = {Cox, B. C., Kaufman, M. I.},
abstractNote = {Two precision mirror gimbals were designed using slit diaphragm flexures to provide two-axis precision mirror alignment in space-limited applications. Both gimbals are currently in use in diagnostics at the National Ignition Facility: one design in the Gamma Reaction History (GRH) diagnostic and the other in the Neutron Imaging System (NIS) diagnostic. The GRH gimbal has an adjustment sensitivity of 0.1 mrad about both axes and a total adjustment capability of ±6°; the NIS gimbal has an adjustment sensitivity of 0.8 μrad about both axes and a total adjustment range of ±3°. Both slit diaphragm flexures were electro-discharge machined out of high-strength titanium and utilize stainless steel stiffeners. The stiffener-flexure design results in adjustment axes with excellent orthogonality and centering with respect to the mirror in a single stage; a typical two-axis gimbal flexure requires two stages. Finite element analyses are presented for both flexure designs, and a design optimization of the GRH flexure is discussed.},
doi = {10.1117/12.890913},
journal = {Proceedings of the SPIE},
number = ,
volume = 8125,
place = {United States},
year = {2011},
month = {9}
}

Conference:
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