Temporal evolution of the energy spectrum of proton microbeam guided through an insulating macrocapillary

G. U.L. Nagy, I. Rajta, K. Tőkési

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

We present theoretical investigation of the temporal evolution of the energy spectrum of ions passing through an insulating capillary. In our simulation we used 1 MeV proton microbeam, and a single, cylindrical shaped polytetrafluoroethylene (PTFE) macrocapillary. In order to prevent the simple geometrical transmission the beam axis was tilted with 1° compared to the capillary axis. According to our simulations, we found that the beam first hit the inner wall of the capillary and build a positive charge patch at a well localized place of the inner capillary surface. As a result, a repulsive electric field is generated for protons enter later into the capillary and a collision-less transmission occurs, which is called ion guiding. We show that our simulated energy spectra are in good agreement with our previous experimental findings.

Original languageEnglish
Pages (from-to)7-11
Number of pages5
JournalNuclear Instruments and Methods in Physics Research, Section B: Beam Interactions with Materials and Atoms
Volume458
DOIs
Publication statusPublished - Nov 1 2019

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microbeams
Protons
energy spectra
protons
Ions
Polytetrafluoroethylenes
Electric fields
polytetrafluoroethylene
ions
simulation
collisions
electric fields

Keywords

  • Ion guiding
  • Macrocapillary
  • Molecular dynamics simulation
  • Nuclear microprobe
  • Proton microbeam

ASJC Scopus subject areas

  • Nuclear and High Energy Physics
  • Instrumentation

Cite this

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abstract = "We present theoretical investigation of the temporal evolution of the energy spectrum of ions passing through an insulating capillary. In our simulation we used 1 MeV proton microbeam, and a single, cylindrical shaped polytetrafluoroethylene (PTFE) macrocapillary. In order to prevent the simple geometrical transmission the beam axis was tilted with 1° compared to the capillary axis. According to our simulations, we found that the beam first hit the inner wall of the capillary and build a positive charge patch at a well localized place of the inner capillary surface. As a result, a repulsive electric field is generated for protons enter later into the capillary and a collision-less transmission occurs, which is called ion guiding. We show that our simulated energy spectra are in good agreement with our previous experimental findings.",
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AU - Nagy, G. U.L.

AU - Rajta, I.

AU - Tőkési, K.

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N2 - We present theoretical investigation of the temporal evolution of the energy spectrum of ions passing through an insulating capillary. In our simulation we used 1 MeV proton microbeam, and a single, cylindrical shaped polytetrafluoroethylene (PTFE) macrocapillary. In order to prevent the simple geometrical transmission the beam axis was tilted with 1° compared to the capillary axis. According to our simulations, we found that the beam first hit the inner wall of the capillary and build a positive charge patch at a well localized place of the inner capillary surface. As a result, a repulsive electric field is generated for protons enter later into the capillary and a collision-less transmission occurs, which is called ion guiding. We show that our simulated energy spectra are in good agreement with our previous experimental findings.

AB - We present theoretical investigation of the temporal evolution of the energy spectrum of ions passing through an insulating capillary. In our simulation we used 1 MeV proton microbeam, and a single, cylindrical shaped polytetrafluoroethylene (PTFE) macrocapillary. In order to prevent the simple geometrical transmission the beam axis was tilted with 1° compared to the capillary axis. According to our simulations, we found that the beam first hit the inner wall of the capillary and build a positive charge patch at a well localized place of the inner capillary surface. As a result, a repulsive electric field is generated for protons enter later into the capillary and a collision-less transmission occurs, which is called ion guiding. We show that our simulated energy spectra are in good agreement with our previous experimental findings.

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