Can positrons be guided by insulating capillaries?

R. D. Dubois, K. Tőkési

Research output: Contribution to journalArticle

13 Citations (Scopus)

Abstract

Guiding of positrons and electrons by macroscopic insulating capillaries is studied both experimentally and via static 2D modeling of positron trajectories. Using sub-femtoamp beams, the transmitted intensities through a macroscopic tapered borosilicate glass capillary are measured as a function of capillary tilt angle and time. In agreement with previous guiding experiments, a portion of the entering beams are found to emerge in the same direction of the capillary axis and the transmitted intensities are found to decrease with increasing capillary tilt angle. But, a comparison with transmitted photon data implies that these features may result from purely geometric reasons. Our simulations imply that even sub-femtoamp beam intensities are sufficient to form charge patches and produce guiding within a short time and that too high intensities may lead to defocusing effects in tapered capillaries. But measurements of the transmitted positron and electron beams as a function of charge entering the capillary could not definitely confirm or reject guiding as no major increases in the transmitted intensity were observed. Thus, guiding of low-intensity positron beams is still in question.

Original languageEnglish
Pages (from-to)186-189
Number of pages4
JournalNuclear Instruments and Methods in Physics Research, Section B: Beam Interactions with Materials and Atoms
Volume279
DOIs
Publication statusPublished - May 15 2012

Fingerprint

Positrons
positrons
Borosilicate glass
Electron beams
Photons
Trajectories
defocusing
borosilicate glass
Electrons
trajectories
electron beams
Experiments
photons
electrons
simulation

Keywords

  • Capillary
  • Guiding
  • Positron

ASJC Scopus subject areas

  • Instrumentation
  • Nuclear and High Energy Physics

Cite this

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abstract = "Guiding of positrons and electrons by macroscopic insulating capillaries is studied both experimentally and via static 2D modeling of positron trajectories. Using sub-femtoamp beams, the transmitted intensities through a macroscopic tapered borosilicate glass capillary are measured as a function of capillary tilt angle and time. In agreement with previous guiding experiments, a portion of the entering beams are found to emerge in the same direction of the capillary axis and the transmitted intensities are found to decrease with increasing capillary tilt angle. But, a comparison with transmitted photon data implies that these features may result from purely geometric reasons. Our simulations imply that even sub-femtoamp beam intensities are sufficient to form charge patches and produce guiding within a short time and that too high intensities may lead to defocusing effects in tapered capillaries. But measurements of the transmitted positron and electron beams as a function of charge entering the capillary could not definitely confirm or reject guiding as no major increases in the transmitted intensity were observed. Thus, guiding of low-intensity positron beams is still in question.",
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T1 - Can positrons be guided by insulating capillaries?

AU - Dubois, R. D.

AU - Tőkési, K.

PY - 2012/5/15

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N2 - Guiding of positrons and electrons by macroscopic insulating capillaries is studied both experimentally and via static 2D modeling of positron trajectories. Using sub-femtoamp beams, the transmitted intensities through a macroscopic tapered borosilicate glass capillary are measured as a function of capillary tilt angle and time. In agreement with previous guiding experiments, a portion of the entering beams are found to emerge in the same direction of the capillary axis and the transmitted intensities are found to decrease with increasing capillary tilt angle. But, a comparison with transmitted photon data implies that these features may result from purely geometric reasons. Our simulations imply that even sub-femtoamp beam intensities are sufficient to form charge patches and produce guiding within a short time and that too high intensities may lead to defocusing effects in tapered capillaries. But measurements of the transmitted positron and electron beams as a function of charge entering the capillary could not definitely confirm or reject guiding as no major increases in the transmitted intensity were observed. Thus, guiding of low-intensity positron beams is still in question.

AB - Guiding of positrons and electrons by macroscopic insulating capillaries is studied both experimentally and via static 2D modeling of positron trajectories. Using sub-femtoamp beams, the transmitted intensities through a macroscopic tapered borosilicate glass capillary are measured as a function of capillary tilt angle and time. In agreement with previous guiding experiments, a portion of the entering beams are found to emerge in the same direction of the capillary axis and the transmitted intensities are found to decrease with increasing capillary tilt angle. But, a comparison with transmitted photon data implies that these features may result from purely geometric reasons. Our simulations imply that even sub-femtoamp beam intensities are sufficient to form charge patches and produce guiding within a short time and that too high intensities may lead to defocusing effects in tapered capillaries. But measurements of the transmitted positron and electron beams as a function of charge entering the capillary could not definitely confirm or reject guiding as no major increases in the transmitted intensity were observed. Thus, guiding of low-intensity positron beams is still in question.

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KW - Guiding

KW - Positron

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