Ion transport through macrocapillaries - Oscillations due to charge patch formation

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• 作者：D.D. Kulkarni^a ; L.A.M. Lyle^b ; C.E. Sosolik^a ; ^{sosolik@clemson.edu" class="auth_mail" title="E-mail the corresponding author}
• 关键词：Ion-transport ; Macrocapillary ; Guiding ; Charge patch formation
• 刊名：Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms
• 出版年：2016
• 出版时间：1 September 2016
• 年：2016
• 卷：382
• 期：Complete
• 页码：54-59
• 全文大小：1577 K

文摘

We present results on ion transport through large bore capillaries (macrocapillaries) that probe both the geometric and ion-guided aspects of this ion delivery mechanism. We have demonstrated that guiding in macrocapillaries exhibits position- and angle-dependent transmission properties which are directly related to the capillary material (either metal or insulator) and geometry. Specifically, we have passed 1 keV Rb⁺${\mathrm{Rb}}^{+}$ ions through glass and metal macrocapillaries, and have observed oscillations for the transmitted ion current passing through the insulating capillaries. Straightforward calculations show that these oscillations can be attributed to beam deflections from charge patches that form on the interior walls of the capillary. The absence of these oscillations in the metal capillary data serve as further confirmation of the role of charge patch formation.