Guiding of a Slow Positron Beam with a Glass Capillary

Abstract

Abstract. Slow positron beam was injected into a non-tapered glass capillary which was tilted angle of θ from the beam axis by a movable stage. Beam profiles of the positrons transported through the capillary were observed with a phosphor screen combined with micro channel plates as a function of θ. Some fraction of positrons was deflected with the tilting angle of the capillary.

Simulations of transmission of 1 MeV protons through an insulating macrocapillary

“…In contrast, the inelastic fraction without the charge patch is well described by a linear dependence on e −Ψ . This feature for inelastically scattered protons is the same with the transmission of electrons [38,39] of energy at 300-1000 eV and positrons [40] with energy of 10 keV through insulating capillaries. It provides a possible scenario to explain the electron transmission mechanism through the insulating capillaries, which is still not well understood up to now.…”

Exploring new aspects and practical applications of capillary guiding of charged particle beams

“…In 2002 the discovery that charged particles can be guided through insulating capillaries [1] initiated numerous experimental and theoretical investigations of this phenomenon [2][3][4][5][6][7][8][9][10][11][12]. Guiding is of interest because the transmitted particles do not change their charge (in the case of ions) or lose significant portions of their kinetic energies (in the case of ions and lower energy electrons).…”

Properties of fast carbon cluster microbeams produced with a tapered capillary

“…By adjusting the capillary axis with respect to the beam direction, we measured energy spectra of the transmitted particles and determined the optimal capillary-axial adjustment for Solid-state nuclear track detector: CR-39 6 achieving maximum transmission fraction of the incident cluster ions without fragmentation. Fig.…”

“…Capillary transmission studies for various types of incident beams, such as slow and fast ions [1][2][3], fast electrons [4,5], and slow positrons [6], demonstrate that the transmission process depends on the projectile velocity and is independent of the projectile mass. The latter result implies that the capillary method is applicable of producing microbeams of heavy particles such as clusters.…”

“…Standard techniques for producing microbeams for radiobiological research employ collimation with pinhole apertures or focusing with electrostatic and/or magnetic lenses. Recent developments for producing charged particle microbeams include a tapered glass capillary with a micron-sized outlet diameter [1][2][3][4][5][6]. The capillary-microbeam method allows for visual pinpoint-irradiation of a selected target area under in-air environment [7][8][9][10].…”