# Simulation of MeV ion transmission through glass micro-capillaries

M J Simon, C L Zhou, M Döbeli, T Ikeda, A M Müller, A Benyagoub, C Grygiel, S Guillous, H Lebius, A Mery, et al.

► To cite this version:

M J Simon, C L Zhou, M Döbeli, T Ikeda, A M Müller, et al. Simulation of MeV ion transmission through glass micro-capillaries. Journal of Physics: Conference Series, 2014, XXVIII International Conference on Photonic, Electronic and Atomic Collisions (ICPEAC 2013) 24-30 July 2013. Lanzhou, China (C13-07-24), 488 (13), pp.132004. 10.1088/1742-6596/488/13/132004. hal-01092603

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Simulation of MeV ion transmission through glass
micro-capillaries

To cite this article: M J Simon *et al* 2014 *J. Phys.: Conf. Ser.* **488** 132004

View the [article online](#) for updates and enhancements.

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Simulation of MeV ion transmission through glass micro-capillaries

M.J. Simon*<fnref n="1" />, C.L. Zhou†, M. Döbeli*, T. Ikeda§, A.M. Müller*, A. Benyagoub†, C. Grygiel†, S. Guillous†, H. Lebius†, A. Mery†, I. Monnet†, F. Ropars†, H. Shiromaru#, A. Cassimi‡²

* ETH Swiss Federal Institute of Technology, Rämistrasse 101 8092 Zurich, Switzerland

†CIMAP, CEA/CNRS/ENSICAEN/UCBN, BP 5133, F-14070 Caen cedex 5, France

§Atomic Physics Laboratory, RIKEN, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan

#Tokyo Metropolitan University, Hachioji, Tokyo 192-0397, Japan

**Synopsis** A Monte-Carlo simulation of MeV ion transmission through glass micro-capillaries had successfully reproduced experimental energy and angular distributions obtained for 71 MeV $Xe^{19+}$ ions on the IRRSUD beam line of GANIL as well as for MeV protons at ETH facility. The transmitted beam is composed of two parts: a core beam, due to direct transmission through the capillary, and a diffuse halo around, experiencing a large energy loss. The present calculation shows that the halo part is due to elastic scattering by the capillary wall.

The production of low current micro-beams using tapered glass capillaries received much attention in the last decade because of reported large beam current increase [1]. Careful transmission measurements performed at our laboratory with in-house made capillaries showed only small enhancement factors between 1 and 2, in agreement with recent publications of other research groups (e.g. [2]) but in sharp contrast to [1].

The origin of this small enhancement is still unknown. At the high ion energy, electrical charging of the capillary wall cannot be invoked. A more reasonable process to explain this effect is simple elastic scattering of the ions in the glass of the capillary walls [2]. To test this assumption a 3D Monte Carlo simulation based on SRIM was performed as described below.

Since our capillaries have a regular conical shape, the capillary tip in the simulation is treated as a perfect cone. For the sake of simplicity, surface roughness and penetration of the ions through the capillary wall at the very tip are neglected. Additionally, the ion beam is simulated as perfectly uniform and collimated.

Figure 1 shows the good agreement obtained between experiment and simulation for the beam profile. The same agreement is obtained also for the energy loss experienced by the ions composing the diffused part around the intense core part. This agreement in both angular and energy distributions of the transmitted ions demonstrates that elastic scattering by the capillary walls is the process leading to the small enhancement obtained on the transmitted beam intensity.

<figure><img src="image_6.png" /><figcaption>**Figure 1.** Comparison of the experimental (upper figure) and simulated (lower figure) beam profile for a 71 MeV $Xe^{19+}$ ion beam transmitted through a capillary with 50 µm outlet diameter.</figcaption></figure>

References

[1] T. Nebiki et al 2003 *J. Vac. Sci. & Techn. A21* 1671

[2] J. Hasegawa et al 2008 *Nucl. Instr. & Meth.* B266 2125

<footnote n="1">¹E-mail: masimon@phys.ethz.ch</footnote>

<footnote n="1">¹E-mail: cassimi@ganil.fr</footnote>