XSPECT telescopes on the SRG: optical performance

Niels Jørgen Stenfeldt Westergaard; Josef Polny; Finn Erland Christensen; Hans Ulrik Nørgaard-Nielsen; Herbert W. Schnopper

doi:10.1117/12.193167

XSPECT telescopes on the SRG: optical performance

Niels Jørgen Stenfeldt Westergaard, Josef Polny, Finn Erland Christensen, Hans Ulrik Nørgaard-Nielsen, Herbert W. Schnopper

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

Abstract

The XSPECT, thin foil, multiply nested telescope on SRG has been designed to achieve a large effective area at energies between 6 and 15 keV. The design goal for the angular resolution is 2 arcmin (HPD). Results of foil figure error measurements are presented. A ray tracing analysis was performed including results of earlier scattering measurements and the foil determination. The results of the analysis are compared with test measurements with X rays and show that there is a larger spread in the PSF than the model can account for. The decrease in effective area due to scattering is estimated to be 30% when the photons that scatter more than 6 arcmin are regarded as lost. The vignetting at off-axis angles leads to an effective area at the edge of the FOV which is 15% of that of an on-axis source.

Original language	English
Journal	Proceedings of SPIE - The International Society for Optical Engineering
Volume	2279
Pages (from-to)	526-531
ISSN	0277-786X
DOIs	https://doi.org/10.1117/12.193167
Publication status	Published - 1994
Event	Advances in Multilayer and Grazing Incidence X-Ray/EUV/FUV Optics - San Diego, United States Duration: 24 Jul 1994 → 24 Jul 1994

Conference

Conference	Advances in Multilayer and Grazing Incidence X-Ray/EUV/FUV Optics
Country/Territory	United States
City	San Diego
Period	24/07/1994 → 24/07/1994

Keywords

Mathematical models
Measurement errors
Performance
Photons
Scattering
Space research
Telescopes
T

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title = "XSPECT telescopes on the SRG: optical performance",

abstract = "The XSPECT, thin foil, multiply nested telescope on SRG has been designed to achieve a large effective area at energies between 6 and 15 keV. The design goal for the angular resolution is 2 arcmin (HPD). Results of foil figure error measurements are presented. A ray tracing analysis was performed including results of earlier scattering measurements and the foil determination. The results of the analysis are compared with test measurements with X rays and show that there is a larger spread in the PSF than the model can account for. The decrease in effective area due to scattering is estimated to be 30% when the photons that scatter more than 6 arcmin are regarded as lost. The vignetting at off-axis angles leads to an effective area at the edge of the FOV which is 15% of that of an on-axis source.",

keywords = "Mathematical models, Measurement errors, Performance, Photons, Scattering, Space research, Telescopes, T",

author = "Westergaard, {Niels J{\o}rgen Stenfeldt} and Josef Polny and Christensen, {Finn Erland} and N{\o}rgaard-Nielsen, {Hans Ulrik} and Schnopper, {Herbert W.}",

year = "1994",

doi = "10.1117/12.193167",

language = "English",

volume = "2279",

pages = "526--531",

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

issn = "0277-786X",

publisher = "Society of Photo-Optical Instrumentation Engineers",

note = "Advances in Multilayer and Grazing Incidence X-Ray/EUV/FUV Optics ; Conference date: 24-07-1994 Through 24-07-1994",

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TY - GEN

T1 - XSPECT telescopes on the SRG: optical performance

AU - Westergaard, Niels Jørgen Stenfeldt

AU - Polny, Josef

AU - Christensen, Finn Erland

AU - Nørgaard-Nielsen, Hans Ulrik

AU - Schnopper, Herbert W.

PY - 1994

Y1 - 1994

N2 - The XSPECT, thin foil, multiply nested telescope on SRG has been designed to achieve a large effective area at energies between 6 and 15 keV. The design goal for the angular resolution is 2 arcmin (HPD). Results of foil figure error measurements are presented. A ray tracing analysis was performed including results of earlier scattering measurements and the foil determination. The results of the analysis are compared with test measurements with X rays and show that there is a larger spread in the PSF than the model can account for. The decrease in effective area due to scattering is estimated to be 30% when the photons that scatter more than 6 arcmin are regarded as lost. The vignetting at off-axis angles leads to an effective area at the edge of the FOV which is 15% of that of an on-axis source.

AB - The XSPECT, thin foil, multiply nested telescope on SRG has been designed to achieve a large effective area at energies between 6 and 15 keV. The design goal for the angular resolution is 2 arcmin (HPD). Results of foil figure error measurements are presented. A ray tracing analysis was performed including results of earlier scattering measurements and the foil determination. The results of the analysis are compared with test measurements with X rays and show that there is a larger spread in the PSF than the model can account for. The decrease in effective area due to scattering is estimated to be 30% when the photons that scatter more than 6 arcmin are regarded as lost. The vignetting at off-axis angles leads to an effective area at the edge of the FOV which is 15% of that of an on-axis source.

KW - Mathematical models

KW - Measurement errors

KW - Performance

KW - Photons

KW - Scattering

KW - Space research

KW - Telescopes

KW - T

U2 - 10.1117/12.193167

DO - 10.1117/12.193167

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VL - 2279

SP - 526

EP - 531

JO - Proceedings of SPIE - The International Society for Optical Engineering

JF - Proceedings of SPIE - The International Society for Optical Engineering

T2 - Advances in Multilayer and Grazing Incidence X-Ray/EUV/FUV Optics

Y2 - 24 July 1994 through 24 July 1994

ER -

XSPECT telescopes on the SRG: optical performance

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