ACIS UV/optical blocking filter calibration at the Natl. Synchrotron Light Source

George Chartas; Gordon P. Garmire; John A. Nousek; Leisa K. Townsley; Forbes R. Powell; Richard L. Blake; Dale E. Graessle

ACIS UV/optical blocking filter calibration at the Natl. Synchrotron Light Source

George Chartas, Gordon P. Garmire, John A. Nousek, Leisa K. Townsley, Forbes R. Powell, Richard L. Blake, Dale E. Graessle

Astronomy & Astrophysics

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

5 Scopus citations

Abstract

Measurements of the transmission properties of the AXAF CCD imaging spectrometer (ACIS) UV/optical blocking filters were performed at the National Synchrotron Light Source at Brookhaven Laboratories. The X-ray transmissions of two Al:Si/LEXAN/Al:Si three layer filters were measured between 260 and 3000 eV. The main purpose of the calibration was to determine a model transmission function with an accuracy of better than 1 percent. We present results from fits of model transmission functions to the measured x-ray transmission data. Detailed fine energy scans above the Al-K and C-K absorption edges revealed the presence of fine oscillations of the x-ray transmission. These features are most likely extended x-ray absorption fine structures (EXAFS). The amplitude of the EXAFS oscillations above the Al absorption edge is about 5 percent of the mean value of the x-ray transmission. EXAFS theory predicts a temperature dependence on the amplitude of the EXAFS oscillations. This dependence arises from the fact that thermal vibrations of the atoms in a solid produce a phase mismatch of the backscattered electron wave function. Since the ACIS filters will be at a much lower temperature on orbit we provide a prediction of the EXAFS component for the expected on orbit temperature of the ACIS filters.

Original language	English (US)
Title of host publication	Proceedings of SPIE - The International Society for Optical Engineering
Editors	Richard B. Hoover, Arthur B.Jr. Walker
Pages	44-54
Number of pages	11
State	Published - Jan 1 1996
Event	Multilayer and Grazing Incidence X-Ray/EUV Optics III - Denver, CO, USA Duration: Aug 5 1996 → Aug 6 1996

Publication series

Name	Proceedings of SPIE - The International Society for Optical Engineering
Volume	2805

Other

Other	Multilayer and Grazing Incidence X-Ray/EUV Optics III
City	Denver, CO, USA
Period	8/5/96 → 8/6/96

All Science Journal Classification (ASJC) codes

Electronic, Optical and Magnetic Materials
Condensed Matter Physics
Computer Science Applications
Applied Mathematics
Electrical and Electronic Engineering

Cite this

Chartas, G., Garmire, G. P., Nousek, J. A., Townsley, L. K., Powell, F. R., Blake, R. L., & Graessle, D. E. (1996). ACIS UV/optical blocking filter calibration at the Natl. Synchrotron Light Source. In R. B. Hoover, & A. B. J. Walker (Eds.), Proceedings of SPIE - The International Society for Optical Engineering (pp. 44-54). (Proceedings of SPIE - The International Society for Optical Engineering; Vol. 2805).

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title = "ACIS UV/optical blocking filter calibration at the Natl. Synchrotron Light Source",

abstract = "Measurements of the transmission properties of the AXAF CCD imaging spectrometer (ACIS) UV/optical blocking filters were performed at the National Synchrotron Light Source at Brookhaven Laboratories. The X-ray transmissions of two Al:Si/LEXAN/Al:Si three layer filters were measured between 260 and 3000 eV. The main purpose of the calibration was to determine a model transmission function with an accuracy of better than 1 percent. We present results from fits of model transmission functions to the measured x-ray transmission data. Detailed fine energy scans above the Al-K and C-K absorption edges revealed the presence of fine oscillations of the x-ray transmission. These features are most likely extended x-ray absorption fine structures (EXAFS). The amplitude of the EXAFS oscillations above the Al absorption edge is about 5 percent of the mean value of the x-ray transmission. EXAFS theory predicts a temperature dependence on the amplitude of the EXAFS oscillations. This dependence arises from the fact that thermal vibrations of the atoms in a solid produce a phase mismatch of the backscattered electron wave function. Since the ACIS filters will be at a much lower temperature on orbit we provide a prediction of the EXAFS component for the expected on orbit temperature of the ACIS filters.",

author = "George Chartas and Garmire, {Gordon P.} and Nousek, {John A.} and Townsley, {Leisa K.} and Powell, {Forbes R.} and Blake, {Richard L.} and Graessle, {Dale E.}",

year = "1996",

month = jan,

day = "1",

language = "English (US)",

isbn = "0819421936",

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

pages = "44--54",

editor = "Hoover, {Richard B.} and Walker, {Arthur B.Jr.}",

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

note = "Multilayer and Grazing Incidence X-Ray/EUV Optics III ; Conference date: 05-08-1996 Through 06-08-1996",

}

Chartas, G, Garmire, GP, Nousek, JA, Townsley, LK, Powell, FR, Blake, RL & Graessle, DE 1996, ACIS UV/optical blocking filter calibration at the Natl. Synchrotron Light Source. in RB Hoover & ABJ Walker (eds), Proceedings of SPIE - The International Society for Optical Engineering. Proceedings of SPIE - The International Society for Optical Engineering, vol. 2805, pp. 44-54, Multilayer and Grazing Incidence X-Ray/EUV Optics III, Denver, CO, USA, 8/5/96.

ACIS UV/optical blocking filter calibration at the Natl. Synchrotron Light Source. / Chartas, George; Garmire, Gordon P.; Nousek, John A. et al.
Proceedings of SPIE - The International Society for Optical Engineering. ed. / Richard B. Hoover; Arthur B.Jr. Walker. 1996. p. 44-54 (Proceedings of SPIE - The International Society for Optical Engineering; Vol. 2805).

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

TY - GEN

T1 - ACIS UV/optical blocking filter calibration at the Natl. Synchrotron Light Source

AU - Chartas, George

AU - Garmire, Gordon P.

AU - Nousek, John A.

AU - Townsley, Leisa K.

AU - Powell, Forbes R.

AU - Blake, Richard L.

AU - Graessle, Dale E.

PY - 1996/1/1

Y1 - 1996/1/1

N2 - Measurements of the transmission properties of the AXAF CCD imaging spectrometer (ACIS) UV/optical blocking filters were performed at the National Synchrotron Light Source at Brookhaven Laboratories. The X-ray transmissions of two Al:Si/LEXAN/Al:Si three layer filters were measured between 260 and 3000 eV. The main purpose of the calibration was to determine a model transmission function with an accuracy of better than 1 percent. We present results from fits of model transmission functions to the measured x-ray transmission data. Detailed fine energy scans above the Al-K and C-K absorption edges revealed the presence of fine oscillations of the x-ray transmission. These features are most likely extended x-ray absorption fine structures (EXAFS). The amplitude of the EXAFS oscillations above the Al absorption edge is about 5 percent of the mean value of the x-ray transmission. EXAFS theory predicts a temperature dependence on the amplitude of the EXAFS oscillations. This dependence arises from the fact that thermal vibrations of the atoms in a solid produce a phase mismatch of the backscattered electron wave function. Since the ACIS filters will be at a much lower temperature on orbit we provide a prediction of the EXAFS component for the expected on orbit temperature of the ACIS filters.

AB - Measurements of the transmission properties of the AXAF CCD imaging spectrometer (ACIS) UV/optical blocking filters were performed at the National Synchrotron Light Source at Brookhaven Laboratories. The X-ray transmissions of two Al:Si/LEXAN/Al:Si three layer filters were measured between 260 and 3000 eV. The main purpose of the calibration was to determine a model transmission function with an accuracy of better than 1 percent. We present results from fits of model transmission functions to the measured x-ray transmission data. Detailed fine energy scans above the Al-K and C-K absorption edges revealed the presence of fine oscillations of the x-ray transmission. These features are most likely extended x-ray absorption fine structures (EXAFS). The amplitude of the EXAFS oscillations above the Al absorption edge is about 5 percent of the mean value of the x-ray transmission. EXAFS theory predicts a temperature dependence on the amplitude of the EXAFS oscillations. This dependence arises from the fact that thermal vibrations of the atoms in a solid produce a phase mismatch of the backscattered electron wave function. Since the ACIS filters will be at a much lower temperature on orbit we provide a prediction of the EXAFS component for the expected on orbit temperature of the ACIS filters.

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M3 - Conference contribution

AN - SCOPUS:0029765979

SN - 0819421936

SN - 9780819421937

T3 - Proceedings of SPIE - The International Society for Optical Engineering

SP - 44

EP - 54

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

A2 - Hoover, Richard B.

A2 - Walker, Arthur B.Jr.

T2 - Multilayer and Grazing Incidence X-Ray/EUV Optics III

Y2 - 5 August 1996 through 6 August 1996

ER -

ACIS UV/optical blocking filter calibration at the Natl. Synchrotron Light Source

Abstract

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All Science Journal Classification (ASJC) codes

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