Physics – Optics
Scientific paper
Jul 1998
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998spie.3355..586l&link_type=abstract
Proc. SPIE Vol. 3355, p. 586-597, Optical Astronomical Instrumentation, Sandro D'Odorico; Ed.
Physics
Optics
Scientific paper
This paper discusses a magnetically focused electron bombarded CCD type ultraviolet image sensor, employing an opaque substrate photocathode. The novel feature, reported in this paper, is the unique light weight permanent magnet structure employed in the electron optics to generate a uniform focus field. The approximately 200 Gauss magnetic field of this 'PXL' prototype is relatively uniform over a considerable region. The weight is only 5 kg, compared to 14 kg for permanent magnet structures of conventional design having comparable field strength and uniformity over equivalent volume. The light weight and low volume of this type of magnet assembly makes it especially attractive for space applications where size and weight are critical design factors. The paper will present experimental data showing the spatial resolution achieved with this new magnet assembly when employed in imaging photoelectrons from an opaque substrate photocathode onto an electron bombarded CCD.
Leupold H.
Lowrance John L.
Potenziani Ernest
Smith Stephen R.
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