We have tested the radio-frequency driven H/sup -/ source and have shown that the H/sup -/ production efficiency and the beam emittance are similar to those obtained from the filament discharge. Typically the numbers are 2.8 mA/cm/sup 2kW and 0.017 /spl pi/-mrad-cm (which corresponds to 1.9 eV) respectively. So far we have operated RF pulses of /spl ap/10 kW for /spl ap/50 ms with a porcelain-coated antenna and /spl ap/15 kW for /spl ap/1 s with additional layers of quartz sleeving. It is necessary to develop better antenna coating material that can withstand the intense plasma heating and sputtering in order to operate at higher power with longer pulse length.
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机译：我们已经测试了射频驱动的H / sup-/源，并显示出H / sup-/的生产效率和光束发射率与从灯丝放电获得的效率和光束发射率相似。通常，数字分别为2.8 mA / cm / sup 2kW和0.017 / spl pi / -mrad-cm（相当于1.9 eV）。到目前为止，我们已经使用镀有陶瓷涂层的天线对/ spl ap / 50 ms进行了/ spl ap / 10 kW的RF脉冲，对/ spl ap / 1 s进行了附加涂层的石英套管使/ spl ap / 15 kW的RF脉冲。为了能够以更高的功率和更长的脉冲长度工作，有必要开发出更好的天线涂层材料，使其能够承受强烈的等离子体加热和溅射。
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