热释电晶体产生电子束
Electron Beam Production by Pyroelectric Crystals
摘要：
热释电晶体用于产生能量大于170 keV的自聚焦电子束。不需要高压电源或电子枪。该系统的工作原理是简单地改变温度的晶体铌酸锂或钽酸锂约100摄氏度的稀释气体。电子束能谱以及正离子束能谱和档案。晶体温度变化100 ℃将引起极化的自发变化。极化的变化将通过晶体表面上电荷的变化来表现。正是这种未补偿的电荷产生了电场，电场加速了电子或正离子，并产生了等离子体，等离子体反过来又使它们聚焦。加速电子或正离子的来源是在晶体表面附近电离的气体分子。当晶体表面是负电子加速远离它和正离子被吸引到表面。这些正离子减少了表面上的净负电荷，从而减少了电场，这导致电子能量随时间降低，即使焦点特性保持不变。当表面为正时，则相反，并且正离子束能量也随着时间而减小。我们将展示视频剪辑，照片和电子数据，展示这些电子束的许多特性和应用。
英文摘要：
Pyroelectric crystals are used to produce self-focused electron beams with energies greater than 170 keV. No high voltage power supply or electron gun is needed. The system works by simply changing the temperature of a crystal of LiNbO3 or LiTaO3 by about 100oC in dilute gas. Electron beam energy spectra as well as positive-ion-beam energy spectra and profiles are shown. A change in the crystal temperature of 100oC will cause a spontaneous change in polarization. The change in polarization will be manifested by a change in charge on the surface of the crystal. It is this uncompensated charge that produces the electric field, which accelerates the electrons, or the positive ions and gives rise to the plasma, which in turn focuses them. The source of the accelerated electrons or positive ions is gas molecules ionized near the crystal surface. When the crystal surface is negative electrons are accelerated away from it and positive ions are attracted to the surface. These positive ions reduce the net negative charge on the surface thereby reducing the electric field, which causes the electron energy to decrease over time even though the focal properties remain unchanged. When the surface is positive the reverse obtains and the positive ion beam energy decreases over time as well. We will present video clips, photographic and electronic data that demonstrate many of the characteristics and applications of these electron beams.
机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。
