By L. Marton and C. Marton (Eds.)

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By letting the radii of the two spheres tend to infinity the formulae for plane parallel proximity focusing and for focusing in a homogeneous, rectilinear magnetic field, such as a long solenoid, appear as special cases in his equations. Great advances have been made in designs for permanent magnet focusing assemblies (PMFA). The development of very high flux density permanent magnets of rare earth/metal alloys such as SmCo has considerably reduced the weight of the magnets. This is of special importance in the field of space applications and light weight image intensifiers.

0 pm, depending on the evaporation conditions of the porous layer. The addition of the porous layer results in an increase in usable target voltage, from several volts to ten volts, and a considerable inprovement in image lag characteristics. Typical image lags are shown in Fig. 11. 10. layer at 10 000 times magnification. (top: bird’s eye view; middle, viewed normally; bottom, cross section). RECENT CHALNICON DEVELOPMENTS 49 FIG. 11. Typical image lags for CdSe-As,Se, (SPS) target. The upper curves in each frame correspond to 5 0 n A signal current and the lower are for zero signal.

Sensitivity in the ultraviolet region is sufficiently high for spectroscopic analysis or for ultraviolet microscopy. It is also possible to extend the spectral response into the infrared region, resulting in a tube suitable for an industrial surveillance TV camera at low light levels. The lag of recent Chalnicons has been reduced by a factor of three, thus greatly extending their fields of application. STANDARD CHALNICON TARGET A standard Chalnicon has a double layer target of cadmium selenide (CdSe) and arsenic trisulphide (As-&) as shown in Fig.

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