Dr. Kashmira Tayabaly Profile

Dr. Kashmira Tayabaly

Consultant at Brookhaven National Lab

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Author

Publications (14)

Proceedings Article | 15 November 2019 Presentation + Paper

Study on the performances of dwell time algorithms in ion beam figuring

Tianyi Wang, Lei Huang, Kashmira Tayabaly, Mourad Idir

Proceedings Volume 11175, 111750M (2019) https://doi.org/10.1117/12.2536869

KEYWORDS: Ion beam finishing, Ion beams, Deconvolution, Fourier transforms, Metrology, Convolution, Synchrotrons

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Proceedings Article | 9 September 2019 Presentation

Stitching interferometry for synchrotron mirror metrology at NSLS-II (Conference Presentation)

Lei Huang, Tianyi Wang, Kashmira Tayabaly, Mourad Idir

Proceedings Volume 11109, 111090R (2019) https://doi.org/10.1117/12.2526502

KEYWORDS: Mirrors, Metrology, Synchrotrons, Stitching interferometry, X-rays, Free electron lasers, Inspection, Interferometry, Synchrotron radiation, Polishing

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Proceedings Article | 9 September 2019 Presentation + Paper

One-dimensional ion-beam figuring solution from Brookhaven National Laboratory

Tianyi Wang, Lei Huang, Matthew Vescovi, Dennis Kuhne, Kashmira Tayabaly, Nathalie Bouet, Mourad Idir

Proceedings Volume 11109, 1110909 (2019) https://doi.org/10.1117/12.2526074

KEYWORDS: Mirrors, Ion beams, Metrology, Calibration, Error analysis, Deconvolution, Ion beam finishing, Synchrotrons

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Proceedings Article | 19 September 2017 Presentation + Paper

Optical simulations for design, alignment, and performance prediction of silicon pore optics for the ATHENA x-ray telescope

D. Spiga, D. Della Monica Ferreira, B. Shortt, M. Bavdaz, E. Bergback Knudsen, G. Bianucci, F. Christensen, M. Civitani, M. Collon, P. Conconi, S. Fransen, F. Marioni, S. Massahi, G. Pareschi, B. Salmaso, A. Jegers, K. Tayabaly, G. Valsecchi, N. Westergaard, E. Wille

Proceedings Volume 10399, 103990H (2017) https://doi.org/10.1117/12.2274905

KEYWORDS: Mirrors, Optical alignment, Silicon, Device simulation, Spatial resolution, Optical design, X-ray telescopes, Wafer-level optics, Diffraction, X-rays

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The ATHENA X-ray observatory is a large-class ESA approved mission, with launch scheduled in 2028. The technology of silicon pore optics (SPO) was selected as baseline to assemble ATHENA’s optic with hundreds of mirror modules, obtained by stacking wedged and ribbed silicon wafer plates onto silicon mandrels to form the Wolter-I configuration. In the current configuration, the optical assembly has a 3 m diameter and a 2 m2 effective area at 1 keV, with a required angular resolution of 5 arcsec. The angular resolution that can be achieved is chiefly the combination of 1) the focal spot size determined by the pore diffraction, 2) the focus degradation caused by surface and profile errors, 3) the aberrations introduced by the misalignments between primary and secondary segments, 4) imperfections in the co-focality of the mirror modules in the optical assembly. A detailed simulation of these aspects is required in order to assess the fabrication and alignment tolerances; moreover, the achievable effective area and angular resolution depend on the mirror module design. Therefore, guaranteeing these optical performances requires: a fast design tool to find the most performing solution in terms of mirror module geometry and population, and an accurate point spread function simulation from local metrology and positioning information. In this paper, we present the results of simulations in the framework of ESA-financed projects (SIMPOSiuM, ASPHEA, SPIRIT), in preparation of the ATHENA X-ray telescope, analyzing the mentioned points: 1) we deal with a detailed description of diffractive effects in an SPO mirror module, 2) we show ray-tracing results including surface and profile defects of the reflective surfaces, 3) we assess the effective area and angular resolution degradation caused by alignment errors between SPO mirror module’s segments, and 4) we simulate the effects of co-focality errors in X-rays and in the UV optical bench used to study the mirror module alignment and integration.

Proceedings Article | 5 October 2016 Presentation + Paper

Two-dimensional PSF prediction of multiple-reflection optical systems with rough surfaces

Kashmira Tayabaly, Daniele Spiga, Giorgia Sironi, Giovani Pareschi, Michele Lavagna

Proceedings Volume 9961, 99610N (2016) https://doi.org/10.1117/12.2235410

KEYWORDS: Mirrors, Point spread functions, Telescopes, Scattering, Atmospheric Cherenkov telescopes, Surface roughness, Sensors, Device simulation, Optical transfer functions, Reflection

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Proceedings Article | 10 August 2016 Paper

Point spread function computation in normal incidence for rough optical surfaces

Kashmira Tayabaly, Daniele Spiga, Giorgia Sironi, Rodolfo Canestrari, Michele Lavagna, Giovanni Pareschi

Proceedings Volume 9911, 99111X (2016) https://doi.org/10.1117/12.2232320

KEYWORDS: Point spread functions, Fourier transforms, Scattering, Spatial resolution, Optics manufacturing, Systems modeling, Mirrors, Spatial frequencies, Image segmentation, Sensors

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Proceedings Article | 27 July 2016 Paper

Simulation and modeling of silicon pore optics for the ATHENA x-ray telescope

D. Spiga, F. Christensen, M. Bavdaz, M. Civitani, P. Conconi, D. Della Monica Ferreira, E. Knudsen, S. Massahi, G. Pareschi, B. Salmaso, B. Shortt, K. Tayabaly, N. J. Westergaard, E. Wille

Proceedings Volume 9905, 99055O (2016) https://doi.org/10.1117/12.2232230

KEYWORDS: Silicon, X-rays, Temperature metrology, Aluminum, Optical filters, Absorption, Absorption filters, Sensors, Reflection, Thermography

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Proceedings Article | 22 July 2016 Paper

Evaluation of novel approach to deflectometry for high accuracy optics

Giorgia Sironi, Rodolfo Canestrari, Kashmira Tayabaly, Giovanni Pareschi

Proceedings Volume 9912, 991213 (2016) https://doi.org/10.1117/12.2233328

KEYWORDS: Deflectometry, Mirrors, Optical testing, Atmospheric Cherenkov telescopes, Spherical lenses, Point spread functions, Telescopes, Distance measurement, Cameras, Zernike polynomials

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Proceedings Article | 2 October 2015 Paper

Testing multilayer-coated polarizing mirrors for the LAMP soft X-ray telescope

D. Spiga, B. Salmaso, R. She, K. Tayabaly, M. Wen, R. Banham, E. Costa, H. Feng, A. Giglia, Q. Huang, F. Muleri, G. Pareschi, P. Soffitta, G. Tagliaferri, G. Valsecchi, Z. Wang

Proceedings Volume 9603, 96031B (2015) https://doi.org/10.1117/12.2185432

KEYWORDS: Reflectivity, Argon, X-rays, Multilayers, Mirrors, Polarization, Nickel, Silicon, Lamps, Glasses

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Proceedings Article | 23 September 2015 Paper

Computation and validation of two-dimensional PSF simulation based on physical optics

K. Tayabaly, D. Spiga, G. Sironi, R. Canestrari, M. Lavagna, G. Pareschi

Proceedings Volume 9577, 957709 (2015) https://doi.org/10.1117/12.2187534

KEYWORDS: Point spread functions, Mirrors, Scattering, Fourier transforms, Sensors, Computer simulations, Optical design, Geometrical optics, Grazing incidence, Ray tracing

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Proceedings Article | 4 September 2015 Paper

Roughness tolerances for Cherenkov telescope mirrors

K. Tayabaly, D. Spiga, R. Canestrari, G. Bonnoli, M. Lavagna, G. Pareschi

Proceedings Volume 9603, 960307 (2015) https://doi.org/10.1117/12.2187025

KEYWORDS: Mirrors, Atmospheric Cherenkov telescopes, Point spread functions, Telescopes, Scattering, Aluminum, Manufacturing, Coating, Tolerancing, Optics manufacturing

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Proceedings Article | 24 August 2015 Paper

LAMP: a micro-satellite based soft x-ray polarimeter for astrophysics

Rui She, Hua Feng, Fabio Muleri, Paolo Soffitta, Renxin Xu, Hong Li, Ronaldo Bellazzini, Zhanshan Wang, Daniele Spiga, Massimo Minuti, Alessandro Brez, Gloria Spandre, Michele Pinchera, Carmelo Sgrò, Luca Baldini, Mingwu Wen, Zhengxiang Shen, Giovanni Pareschi, Gianpiero Tagliaferri, Kashmira Tayabaly, Bianca Salmaso, Yafeng Zhan

Proceedings Volume 9601, 96010I (2015) https://doi.org/10.1117/12.2186133

KEYWORDS: X-rays, Polarimetry, Photons, Lamps, Mirrors, Polarization, Stars, Sensors, Magnetism, Electroluminescent displays

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Proceedings Article | 7 September 2013 Paper

Calculating BTDF from window surface roughness

John Stover, Vladimir Lopushenko, Kashmira Tayabaly, Eugene Church

Proceedings Volume 8838, 883804 (2013) https://doi.org/10.1117/12.2024599

KEYWORDS: Scatter measurement, Bidirectional reflectance transmission function, Spatial frequencies, Surface roughness, Dielectrics, Geometrical optics, Glasses, Polishing, Contamination, Light sources

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Proceedings Article | 7 September 2013 Paper

Use of the surface PSD and incident angle adjustments to investigate near specular scatter from smooth surfaces

Kashmira Tayabaly, John Stover, Robert Parks, Matthew Dubin, James Burge

Proceedings Volume 8838, 883805 (2013) https://doi.org/10.1117/12.2024612

KEYWORDS: Bidirectional reflectance transmission function, Scatter measurement, Mirrors, Zerodur, Silicon, Geometrical optics, Profilometers, Semiconducting wafers, Light scattering, Fourier transforms

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Showing 5 of 14 publications

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