Gated carbon-based cold cathode for high current applications
Gated carbon-based cold cathode for high current applications
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适用于高电流应用的门控碳基冷阴极
DOI：
10.1116/1.1587135
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发表时间：
2003
影响因子：
1.4
通讯作者：
A. Kloba
中科院分区：
文献类型：
--
作者：
K. Jamison;B. Zollars;D. Patterson;R. Schueller;H. Windischmann;G. Mulhollan;A. Kloba
我们已经开发出一种门控碳基冷阴极，能够在高电流密度下工作，用于阴极射线管、微波器件和X射线源等应用。碳基电子发射材料是这些应用的良好选择，因为当暴露于大气时，它不容易形成天然氧化物。因此，阴极可以在插入最终器件之前在真空室中进行预测试。鉴于碳具有低溅射产率并且相对惰性，这种材料是中等真空环境中长寿命应用的理想候选材料。我们研制的直径为500 μ m的冷阴极阵列包含约5000个微尖，在70-118 V的栅压下发射0.1-500 μA，在500 μA发射电流下，阵列上的平均电流密度约为0.25A/cm ~ 2。在阴极射线管中，在0.10 A/cm 2的电流密度下对单个冷阴极进行的长期测试表明，寿命超过5000 h。峰值电流超过10 mA（电流d...
We have developed a gated carbon-based cold cathode capable of operating at high current densities for use in applications such as cathode-ray tubes, microwave devices, and x-ray sources. The carbon-based electron-emitting material is a good choice for these applications as it does not readily form a native oxide when exposed to atmosphere. Cathodes can thus be pretested in a vacuum chamber before insertion into the final device. Given that carbon has a low sputtering yield and is relatively inert, this material is an ideal candidate for long-lived applications in moderate vacuum environments. Our present 500-μm-diam cold cathode array contains approximately 5000 individual microtips and emits 0.1–500 μA for a gate voltage of 70–118 V. The average current density over the array is about 0.25 A/cm2 at 500 μA emission current. Long-term testing of individual cold cathodes at current densities of 0.10 A/cm2 in cathode-ray tubes has shown lifetimes in excess of 5000 h. Peak currents exceeding 10 mA (current d...