中文摘要：

用锥形玻璃毛细管聚焦离子束方法获取微米离子束成本低、使用方便，我们制备了出口口径35—110μm不等的多种锥形玻璃毛细管，并用其在2×1．7MV串列加速器上获得了出射束流密度比入射束流密度大的MeV能量He^＋微离子束。用金硅面垒探测器（SBD）测量在毛细管与入射束夹角不同条件下出射的微米束的能谱，并对锥形玻璃毛细管聚柬的机制做初步定性讨论。

英文摘要：

A novel ion beam focusing technique, tapered glass capillary, has interested many groups. Compared to conventional way of obtaining micro ion beams, its advantages are cheap, simple compacted, and convenient. However, mechanisms of the tapered glass capillary in focusing MeV ions are not clear yet. In this work, 2 MeV He^＋ ion microbeams were obtained with tapered glass capillaries in outlet diameter of 35, 75 and 110 pro. The current intensity, beam crosssection, and energy spectra were measured at various tilt angles of the capillary. The results suggested that the MeV ions outgoing from capillary outlet might undertake at least two of three kinds of interactions： deflection by the electrical field of statistic charges deposited on the capillary wall, small angle scattering by continuously surface potential, and small angle Rutherford scattering.