Abstract: A diagnostic technique has been developed to determine the negative hydrogen ion (H$+$MIN$//D$+$MIN$/) thermal energy in a variety of conditions in a volume production ion source. The method is based on Nd:YAG laser photodetachment of the negative ions. The photodetachment produces local changes in the ion and electron densities, whose space and time evolution are traced by the use of a probe and a time-delayed second Nd:YAG laser pulse. The results of measurements using this technique for deuterium ions are described. Information was collected from the center of the source to near the plasma electrode. The effects of the presence of electric and magnetic fields near the probe during measurements are addressed. The present study demonstrates that the extracted ion current is equal to the thermal flux through the extraction aperture.!
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机译:摘要:已经开发出一种诊断技术,可以在量产离子源中的各种条件下确定负氢离子(H $ + $ MIN $ // D $ + $ MIN $ /)热能。该方法基于负离子的Nd:YAG激光光解。光分离使离子密度和电子密度发生局部变化,通过使用探针和延时的第二Nd:YAG激光脉冲跟踪其空间和时间演变。描述了使用该技术对氘离子的测量结果。从信息源的中心到等离子电极附近收集信息。解决了测量过程中探头附近电场和磁场的影响。本研究表明,提取的离子电流等于通过提取孔的热通量。
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