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The effects of ion bombardment on the field emission of screen printed tetrapod zinc oxide cathodes are reported. The field emission characteristics of this cathode degrade strongly after Ar ion bombardment for 10 min at an energy of 3 keV and ion current of 5 muA. The emission current density decreases from 1.65 to 0.32 mA/cm2 at 4.50 V/mum field strength, while the turn-on field increases from 2...
This paper reports the development and the operation of field emitters with low turn on electric field based on carbon fibres. Field emitters of vertical carbon fibres on silicon substrate were fabricated by the catalyst chemical vapor deposition. The diameter of the fibres is about 3~4 mum and the height is larger than 1 mm. After one aging process of 150 minutes, field emission measurements of carbon...
Due to the electron-gas collision ionization in a FED, positively charged ions bombard the cathode. This can destroy the field emitters and cause instabilities. In this study we have selected a normal-gate sub-cell to calculate the ion bombardment (IB). In the cases of uniform emitting and ring emitting, the process of ion bombardment and cathode damage has been investigated.
Ion bombardment is one of the important factors limiting the performance of impregnated cathodes (=Ba dispenser cathodes) in high end television tubes or in colour monitor tubes. Hence, when designing a new gun with, e.g. higher electron beam current density, it is important also to model the influence of ion bombardment. Therefore, relations between basic parameters as a function of temperature need...
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