Electron-bombarded CCD image sensor with novel permanent magnet focusing

John L. Lowrance; Stephen R. Smith; H. Leupold; Ernest Potenziani

doi:10.1117/12.316836

9 July 1998 Electron-bombarded CCD image sensor with novel permanent magnet focusing

John L. Lowrance, Stephen R. Smith, H. Leupold, Ernest Potenziani

Proceedings Volume 3355, Optical Astronomical Instrumentation; (1998) https://doi.org/10.1117/12.316836
Event: Astronomical Telescopes and Instrumentation, 1998, Kona, HI, United States

Abstract

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.

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John L. Lowrance, Stephen R. Smith, H. Leupold, and Ernest Potenziani "Electron-bombarded CCD image sensor with novel permanent magnet focusing", Proc. SPIE 3355, Optical Astronomical Instrumentation, (9 July 1998); https://doi.org/10.1117/12.316836

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KEYWORDS

Charge-coupled devices

Magnetism

Cladding

CCD image sensors

Ultraviolet radiation

Image sensors

Opacity

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