Optimizations of Pt/SiC and W/Si multilayers for the Nuclear Spectroscopic Telescope Array

K. K. Madsen; F. A. Harrison; P. H. Mao; Finn Erland Christensen; Carsten P. Cooper-Jensen; Nicolai Brejnholt; J. Koglin; M. J. Pivovaroff

doi:10.1117/12.826669

Optimizations of Pt/SiC and W/Si multilayers for the Nuclear Spectroscopic Telescope Array

K. K. Madsen, F. A. Harrison, P. H. Mao, Finn Erland Christensen, Carsten P. Cooper-Jensen, Nicolai Brejnholt, J. Koglin, M. J. Pivovaroff

National Space Institute

Research output: Contribution to journal › Journal article › Research › peer-review

Abstract

The Nuclear Spectroscopic Telescope Array, NuSTAR, is a NASA funded Small Explorer Mission, SMEX, scheduled for launch in mid 2011. The spacecraft will fly two co-aligned conical approximation Wolter-I optics with a focal length of 10 meters. The mirrors will be deposited with Pt/SiC and W/Si multilayers to provide a broad band reflectivity from 6 keV up to 78.4 keV. To optimize the mirror coating we use a Figure of Merit procedure developed for gazing incidence optics, which averages the effective area over the energy range, and combines an energy weighting function with an angular weighting function to control the shape of the desired effective area. The NuSTAR multilayers are depth graded with a power-law, di = a/(b + i)c, and we optimize over the total number of bi-layers, N, c, and the maximum bi-layer thickness, dmax. The result is a 10 mirror group design optimized for a flat even energy response both on and off-axis.

Original language	English
Journal	Proceedings of SPIE, the International Society for Optical Engineering
Volume	7437
Issue number	743716
ISSN	0277-786X
DOIs	https://doi.org/10.1117/12.826669
Publication status	Published - 2009

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@article{882e0796497a4a6bbbbeec89568625c7,

title = "Optimizations of Pt/SiC and W/Si multilayers for the Nuclear Spectroscopic Telescope Array",

abstract = "The Nuclear Spectroscopic Telescope Array, NuSTAR, is a NASA funded Small Explorer Mission, SMEX, scheduled for launch in mid 2011. The spacecraft will fly two co-aligned conical approximation Wolter-I optics with a focal length of 10 meters. The mirrors will be deposited with Pt/SiC and W/Si multilayers to provide a broad band reflectivity from 6 keV up to 78.4 keV. To optimize the mirror coating we use a Figure of Merit procedure developed for gazing incidence optics, which averages the effective area over the energy range, and combines an energy weighting function with an angular weighting function to control the shape of the desired effective area. The NuSTAR multilayers are depth graded with a power-law, di = a/(b + i)c, and we optimize over the total number of bi-layers, N, c, and the maximum bi-layer thickness, dmax. The result is a 10 mirror group design optimized for a flat even energy response both on and off-axis.",

author = "Madsen, {K. K.} and Harrison, {F. A.} and Mao, {P. H.} and Christensen, {Finn Erland} and Cooper-Jensen, {Carsten P.} and Nicolai Brejnholt and J. Koglin and Pivovaroff, {M. J.}",

year = "2009",

doi = "10.1117/12.826669",

language = "English",

volume = "7437",

journal = "Proceedings of SPIE, the International Society for Optical Engineering",

issn = "0277-786X",

publisher = "S P I E - International Society for Optical Engineering",

number = "743716",

}

Optimizations of Pt/SiC and W/Si multilayers for the Nuclear Spectroscopic Telescope Array. / Madsen, K. K.; Harrison, F. A.; Mao, P. H.; Christensen, Finn Erland; Cooper-Jensen, Carsten P.; Brejnholt, Nicolai; Koglin, J.; Pivovaroff, M. J.

In: Proceedings of SPIE, the International Society for Optical Engineering, Vol. 7437, No. 743716, 2009.

Research output: Contribution to journal › Journal article › Research › peer-review

TY - JOUR

T1 - Optimizations of Pt/SiC and W/Si multilayers for the Nuclear Spectroscopic Telescope Array

AU - Madsen, K. K.

AU - Harrison, F. A.

AU - Mao, P. H.

AU - Christensen, Finn Erland

AU - Cooper-Jensen, Carsten P.

AU - Brejnholt, Nicolai

AU - Koglin, J.

AU - Pivovaroff, M. J.

PY - 2009

Y1 - 2009

N2 - The Nuclear Spectroscopic Telescope Array, NuSTAR, is a NASA funded Small Explorer Mission, SMEX, scheduled for launch in mid 2011. The spacecraft will fly two co-aligned conical approximation Wolter-I optics with a focal length of 10 meters. The mirrors will be deposited with Pt/SiC and W/Si multilayers to provide a broad band reflectivity from 6 keV up to 78.4 keV. To optimize the mirror coating we use a Figure of Merit procedure developed for gazing incidence optics, which averages the effective area over the energy range, and combines an energy weighting function with an angular weighting function to control the shape of the desired effective area. The NuSTAR multilayers are depth graded with a power-law, di = a/(b + i)c, and we optimize over the total number of bi-layers, N, c, and the maximum bi-layer thickness, dmax. The result is a 10 mirror group design optimized for a flat even energy response both on and off-axis.

AB - The Nuclear Spectroscopic Telescope Array, NuSTAR, is a NASA funded Small Explorer Mission, SMEX, scheduled for launch in mid 2011. The spacecraft will fly two co-aligned conical approximation Wolter-I optics with a focal length of 10 meters. The mirrors will be deposited with Pt/SiC and W/Si multilayers to provide a broad band reflectivity from 6 keV up to 78.4 keV. To optimize the mirror coating we use a Figure of Merit procedure developed for gazing incidence optics, which averages the effective area over the energy range, and combines an energy weighting function with an angular weighting function to control the shape of the desired effective area. The NuSTAR multilayers are depth graded with a power-law, di = a/(b + i)c, and we optimize over the total number of bi-layers, N, c, and the maximum bi-layer thickness, dmax. The result is a 10 mirror group design optimized for a flat even energy response both on and off-axis.

U2 - 10.1117/12.826669

DO - 10.1117/12.826669

M3 - Journal article

VL - 7437

JO - Proceedings of SPIE, the International Society for Optical Engineering

JF - Proceedings of SPIE, the International Society for Optical Engineering

SN - 0277-786X

IS - 743716

ER -