Transmission dynamics of 1 MeV H+ microbeam guided through an insulating macrocapillary

G. U.L. Nagy, E. Giglio, I. Rajta, K. Tőkési

Research output: Contribution to journalArticle

Abstract

Experimental observation of the dynamics of a micro-focused, 1 MeV proton beam guided through a single, insulating macrocapillary is presented. The micrometer sized proton beam was center injected into a poly(tetrafluoroethylene) capillary with macroscopic dimensions. The capillary was tilted to 1° with respect to the beam, i.e. no geometrical transmission was possible, but the beam first hit the inner capillary wall. After a sufficient electric charge-up of the insulator material due to the interaction with the charged particle beam, guiding appeared thanks to the beam deflection caused by the formed electrostatic field. With an increasing amount of the accumulated charge on the wall, the deflection of the beam also increased, resulting in the dynamics of the transmission. When a dynamical equilibrium between the charges being deposited and flowing away in form of leakage current was set in, the deflection of the beam saturated at a certain position. Here, the transmitted fraction of the beam reached 90% relative to the incident beam. At this position the angular distribution of the transmitted beam was determined. In the sample tilting plane focusing effect was observable, while in the perpendicular plane, the beam was defocused.

Fingerprint

Proton beams
microbeams
Particle beams
Electric charge
Angular distribution
Beam plasma interactions
Charged particles
Polytetrafluoroethylenes
Leakage currents
Electric fields
deflection
proton beams
polytetrafluoroethylene
particle beams
electric charge
micrometers
charged particles
leakage
angular distribution
insulators

Keywords

  • Insulating macrocapillary
  • Ion guiding
  • Nuclear microprobe
  • Proton microbeam

ASJC Scopus subject areas

  • Nuclear and High Energy Physics
  • Instrumentation

Cite this

@article{93d2acc6039944b6a21c9c7455aff6d3,
title = "Transmission dynamics of 1 MeV H+ microbeam guided through an insulating macrocapillary",
abstract = "Experimental observation of the dynamics of a micro-focused, 1 MeV proton beam guided through a single, insulating macrocapillary is presented. The micrometer sized proton beam was center injected into a poly(tetrafluoroethylene) capillary with macroscopic dimensions. The capillary was tilted to 1° with respect to the beam, i.e. no geometrical transmission was possible, but the beam first hit the inner capillary wall. After a sufficient electric charge-up of the insulator material due to the interaction with the charged particle beam, guiding appeared thanks to the beam deflection caused by the formed electrostatic field. With an increasing amount of the accumulated charge on the wall, the deflection of the beam also increased, resulting in the dynamics of the transmission. When a dynamical equilibrium between the charges being deposited and flowing away in form of leakage current was set in, the deflection of the beam saturated at a certain position. Here, the transmitted fraction of the beam reached 90{\%} relative to the incident beam. At this position the angular distribution of the transmitted beam was determined. In the sample tilting plane focusing effect was observable, while in the perpendicular plane, the beam was defocused.",
keywords = "Insulating macrocapillary, Ion guiding, Nuclear microprobe, Proton microbeam",
author = "Nagy, {G. U.L.} and E. Giglio and I. Rajta and K. Tők{\'e}si",
year = "2019",
month = "1",
day = "1",
doi = "10.1016/j.nimb.2018.11.045",
language = "English",
journal = "Nuclear Instruments and Methods in Physics Research, Section B: Beam Interactions with Materials and Atoms",
issn = "0168-583X",
publisher = "Elsevier",

}

TY - JOUR

T1 - Transmission dynamics of 1 MeV H+ microbeam guided through an insulating macrocapillary

AU - Nagy, G. U.L.

AU - Giglio, E.

AU - Rajta, I.

AU - Tőkési, K.

PY - 2019/1/1

Y1 - 2019/1/1

N2 - Experimental observation of the dynamics of a micro-focused, 1 MeV proton beam guided through a single, insulating macrocapillary is presented. The micrometer sized proton beam was center injected into a poly(tetrafluoroethylene) capillary with macroscopic dimensions. The capillary was tilted to 1° with respect to the beam, i.e. no geometrical transmission was possible, but the beam first hit the inner capillary wall. After a sufficient electric charge-up of the insulator material due to the interaction with the charged particle beam, guiding appeared thanks to the beam deflection caused by the formed electrostatic field. With an increasing amount of the accumulated charge on the wall, the deflection of the beam also increased, resulting in the dynamics of the transmission. When a dynamical equilibrium between the charges being deposited and flowing away in form of leakage current was set in, the deflection of the beam saturated at a certain position. Here, the transmitted fraction of the beam reached 90% relative to the incident beam. At this position the angular distribution of the transmitted beam was determined. In the sample tilting plane focusing effect was observable, while in the perpendicular plane, the beam was defocused.

AB - Experimental observation of the dynamics of a micro-focused, 1 MeV proton beam guided through a single, insulating macrocapillary is presented. The micrometer sized proton beam was center injected into a poly(tetrafluoroethylene) capillary with macroscopic dimensions. The capillary was tilted to 1° with respect to the beam, i.e. no geometrical transmission was possible, but the beam first hit the inner capillary wall. After a sufficient electric charge-up of the insulator material due to the interaction with the charged particle beam, guiding appeared thanks to the beam deflection caused by the formed electrostatic field. With an increasing amount of the accumulated charge on the wall, the deflection of the beam also increased, resulting in the dynamics of the transmission. When a dynamical equilibrium between the charges being deposited and flowing away in form of leakage current was set in, the deflection of the beam saturated at a certain position. Here, the transmitted fraction of the beam reached 90% relative to the incident beam. At this position the angular distribution of the transmitted beam was determined. In the sample tilting plane focusing effect was observable, while in the perpendicular plane, the beam was defocused.

KW - Insulating macrocapillary

KW - Ion guiding

KW - Nuclear microprobe

KW - Proton microbeam

UR - http://www.scopus.com/inward/record.url?scp=85059331418&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=85059331418&partnerID=8YFLogxK

U2 - 10.1016/j.nimb.2018.11.045

DO - 10.1016/j.nimb.2018.11.045

M3 - Article

JO - Nuclear Instruments and Methods in Physics Research, Section B: Beam Interactions with Materials and Atoms

JF - Nuclear Instruments and Methods in Physics Research, Section B: Beam Interactions with Materials and Atoms

SN - 0168-583X

ER -