H Lya transmittance of thin foils of C, Si/C, and Al/C for keV particle detectors

Details H Lya transmittance of thin foils of C, Si/C, and Al/C for keV particle detectors H Lya transmittance of thin foils of C, Si/C, and Al/C for keV particle detectors

Jun 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992spie.1744..148d&link_type=abstract

Proc. SPIE Vol. 1744, p. 148-160, Instrumentation for Magnetospheric Imagery, Supriya Chakrabarti; Ed.

Computer Science

1

Scientific paper

A class of instruments designed for remote sensing of space plasmas by measuring energetic neutral atoms (ENA) uses a thin foil as both a signal generator and a light shield. An ENA imager must look directly at the ENA source region, which is also usually in intense source of H Ly(alpha) (1216 angstroms) photons. ENA are produced by charge exchange between energetic ions and the ambient neutrals, and both charge exchange cross section s and ion populations decrease with increasing ion energy. Therefore it is desirable to minimize the energy threshold for ENA detectors, at the same time maximizing the blocking of H Ly(alpha) . Optimizing filter design to meet these two contrary requirements has led us to measure the transmittance of thin C, Si/C, and Al/C foils at H Ly(alpha) . Our results indicate that (1) transmittance of < 7 X 10(superscript -4) can be achieved with (mu) g/cm(superscript 2) Si on 1.7 (mu) g/cm(superscript 2) C; (2) an Si/C composite foil with a thin carbon layer is more effective in blocking UV radiation while having the lowest energy threshold of all the foils measured; and (3) transmittance of Si/C foils of known Si and C thicknesses cannot be accurately predicted, but must be measured.

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