Publication detail

Influence of Saturation of Magnetic Lens Material on Fields of Deflectors and Parasitic Fields

ZLÁMAL, J. LENCOVÁ, B.

Czech title

Vliv nasycení materiálu magnetické čočky na pole deflektorů a parazitární pole

English title

Influence of Saturation of Magnetic Lens Material on Fields of Deflectors and Parasitic Fields

Type

journal article in Scopus

Language

en

Original abstract

In the connection with the calculation of parasitic fields of highly saturated lens in emerged the problem of calculation of the field of deflectors situated next to saturated magnetic materials. Up to date the deflection fields were studied only near rotationally symmetric materials with constant permeability. However, for the deflectors in saturated magnetic lenses the relative permeability is very inhomogeneous and near pole piece tips it is close to 1. We have therefore modified the computation of deflection fields in saturated lenses with EOD program to include the real value of permeability of magnetic materials. We can also display the distribution of permeability in the magnetic circuit of the lens to understand the changes in the field distribution in deflection or parasitic fields and to understand the saturation effects in magnetic lenses.

Czech abstract

V souvislosti s výpočtem parazitických polí vysoce nasyceného objektivu se objevil problém výpočtu oblasti deflektorů umístěných vedle nasycených magnetických materiálů. Upravili jsme výpočet průhybu polí nasycených objektivů v programu EOD tak, aby zahrnovala skutečnou hodnotu propustnosti magnetického materiálu.

English abstract

In the connection with the calculation of parasitic fields of highly saturated lens in emerged the problem of calculation of the field of deflectors situated next to saturated magnetic materials. Up to date the deflection fields were studied only near rotationally symmetric materials with constant permeability. However, for the deflectors in saturated magnetic lenses the relative permeability is very inhomogeneous and near pole piece tips it is close to 1. We have therefore modified the computation of deflection fields in saturated lenses with EOD program to include the real value of permeability of magnetic materials. We can also display the distribution of permeability in the magnetic circuit of the lens to understand the changes in the field distribution in deflection or parasitic fields and to understand the saturation effects in magnetic lenses.

Keywords in Czech

Magnetické čočky; Elektronová optika; EOD

Keywords in English

Magnetic Lens; Electron Optics; EOD

RIV year

2015

Released

30.06.2015

ISSN

1431-9276

Volume

21

Number

S4

Pages from–to

188–193

Pages count

6

BIBTEX


@article{BUT119196,
  author="Jakub {Zlámal} and Jan {Čechal} and Bohumila {Lencová},
  title="Influence of Saturation of Magnetic Lens Material on Fields of Deflectors and Parasitic Fields",
  year="2015",
  volume="21",
  number="S4",
  month="June",
  pages="188--193",
  issn="1431-9276"
}