Transmission of the HRC UV/Ion Shields
(as of 18 February 1998)
This document contains tables and plots of the transmission of the HRC UV/Ion shields (see Focal Plane Layout and Filter Design). Ken Kobayashi, Gary Meehan, and Ralph Kraft have measured the x-ray transmission of HRC UVIS witness samples at up to 20 discrete energies with a 1 meter McPherson grazing incidence monochromator. Marco Barbera (Istituto e Osservatorio Astronomico G.S. Vaiana, Palermo, Italy) has made x-ray transmission measurements of HRC UVIS witness samples using the synchrotron at Bessy in order to determine x-ray absorption fine structure near absorption edges. Martin Zombeck has measured the near UV and visible light transmission of HRC UVIS witness samples using the Hitachi Model U-4001 recording spectrophotometer in the Material Research Laboratory of Harvard University's Gordon McKay Laboratories.
Grazing Incidence Monochromator Results
The data files (with a .dat extension) are ascii tables with four columns containing the energy (eV), best fit total transmission, transmission of the Al layer, and the transmission of the polyimide layer. The figures plot the data and best fit total transmission, plus give the best fit values of the parameters and the uncertainties (90% confidence level).
HRC-I
Table uvisnlr.1174.82.dat
HRC-S: Central segment (0) under thick part of Al
Table uvisnlr.1052.82.dat
HRC-S: Central segment (0) under thin part of Al
Table hrcs_r2.dat
(Note: witness sample not available. We have calculated the transmission of this region based upon the manufacturer's (Luxel Corporation) measured Al
thicknesess and our determination of the thicknesses of the polyimide substrates.)
HRC-S: Wing segment +1 under thick part of Al
Table uvisnlr.1092.82.dat
HRC-S: Wing segment -1 under thick part of Al
Table uvisnlr.891.82.dat
HRC-S: Wing segment +1 under thin part of Al
Table uvisnlr.354.82.dat
HRC-S: Wing segment -1 under thin part of Al
Table uvisnlr.565.82.dat
Bessy Synchrotron Results
HRC-I
Table TF101-1174.dat
HRC-S: Central segment (0) under thick part of Al
Table TF101-1053.dat
HRC-S: Wing segments (-1,+1) under thick part of Al
Table TF101-891.dat
HRC-S: Wing segments (-1,+1) under thin part of Al
Table TF100-354.dat
Out-of-Band Transmission
HRC-I
UVIS-I witness sample (TF100-1174) transmission measurement in the near UV-Visible band.
Table tf1174.prn
HRC-I UVIS transmission in the EUV - Visible band. The model is based on a witness sample (TF100-1174) measurement (4400-8000) and linear attenuation coefficients from the literature. The boxes are measurements at 1470 and 2537 A.
Table hrci_uvt.prn
HRC-S, Outer Segment; thinnest part
UVIS-I witness sample (TF100-565; +1 segment, thinnest Al) transmission measurement in the near UV-Visible band.
Table tf565.prn
A model of the HRC-S EUV - Visible transmission for segments -1 and +1 under the thin (300 A) aluminum coating. The model is based on a witness sample (TF100-565) measurement (3200-8000A) and linear attenuation coefficients from the literature.
Table hrcso_uvt.prn
Reference
A SPIE paper (in postscript) gives details of the measureme procedures, analysis techniques, and results.How to display postscript plots with the Netscape browser.