【作者】 龚知宇； 颜莎； 马宏骥； 聂锐； 薛建明； 王宇钢；

【Author】 Zhiyu Gong~1,Sha Yan~(1*),Hongji Ma~2,Rui Nie~2,Jianming Xue~1,Yugang Wang~1 1 State Key laboratory of Nuclear Physics and Technolog,Institute of Heavy Ion Physics,Peking University,Beijing,100871,China 2 State Key laboratory of Nuclear Physics and Technology,Department of Technical Physics,Peking University,Beijing,100871,China

【机构】 北京大学重离子物理研究所核科学与核技术国家重点实验室； 北京大学技术物理系核科学与核技术国家重点实验室；

【摘要】 用锥形玻璃毛细管聚焦离子束的方法获取微米离子束具有成本低、使用方便的特点,我们制备了出口口径20～100μm不等的多种锥形玻璃毛细管,并用其在2×1.7 MV串列加速器上获得了出射束流密度比入射束流密度大1～2个数量级的MeV能量He+微离子束。利用金硅面垒探测器(SBD)测量了在毛细管与入射束夹角不同条件下出射的微米束的能谱,并据此对锥形玻璃毛细管聚束的机制做了初步定性讨论。更多还原

【Abstract】 A novel ion beam focusing technology,tapered glass capillary focusing techniques is booming Compared to conventional way to obtain micro ion beam,it is much cheaper,more simple and compacted,and more convenient.However,the mechanics for tapered glass capillary focusing MeV ions is not clear yet.We obtained micro ion beams with a series of tapered glass capillaries which outlet diameter varying 20 to 100μm.,then measured the angle dependence of current mtensitv. beam crosssection,and the energy spectra at various tilt angles.The experimental results implies qualitatively that the MeV ions outgoing from capillary outlet undertake at least three kind of mteraction:deflection in the electrical field of statistic charges deposited on the capillary wall,small angle scattering by continued surface potential,and small angle Rutherford scattering.更多还原