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Transport mechanism of MeV protons in tapered glass capillaries.

Authors :
Hasegawa, Jun
Jaiyen, Sarawut
Polee, Chalermpong
Chankow, Nares
Oguri, Yoshiyuki
Source :
Journal of Applied Physics. Aug2011, Vol. 110 Issue 4, p044913. 9p.
Publication Year :
2011

Abstract

To investigate the transport mechanism of MeV protons in tapered glass capillaries, spatially resolved energy spectra were measured for proton microbeams focused by 20-μm-outlet capillaries having various taper angles. Three-dimensional Monte Carlo (MC) simulations were also performed to support the experiments and trace each particle in the capillary in more detail. The dependence of the proton energy distribution on the outgoing angle proved that the capillary-focused proton beam consists of two different components, protons traveling straight through the capillary without colliding with the capillary wall and protons scattered by the capillary inner wall. Moreover, the focusing effect of the tapered glass capillary was found to be mainly due to the scattered beam component. The MC simulations well reproduced the experimental results and showed that beam focusing ratios of 1.6-2.4 are possible with capillaries having a convex inner wall. The flight distance of the scattered proton in the capillary glass body was found to play an important role in determining transport efficiency of the protons through the capillary. [ABSTRACT FROM AUTHOR]

Details

Language :
English
ISSN :
00218979
Volume :
110
Issue :
4
Database :
Academic Search Index
Journal :
Journal of Applied Physics
Publication Type :
Academic Journal
Accession number :
65108546
Full Text :
https://doi.org/10.1063/1.3624617