Wien filter design

Details Wien filter design Wien filter design

1987-05-27

1988-12-06

Anderson, Bruce C.

Radiant energy

With charged particle beam deflection or focussing

Magnetic lens

250296, H01J 314, G21K 108, B01D 5944

Patent

active

047897872

ABSTRACT:
A Wien filter for use in charged particle beam systems is disclosed, having two opposed resistive magnetic pole pieces separated from a set of excitation coils by an electrically insulating material. Two opposed electric pole pieces are positioned in orthogonal relationship to and in physical contact with the magnetic pole pieces to form a physical aperture through which the charged particles will pass. The resistivity of the magnetic pole pieces is such that sufficient current will flow through them between the electric pole pieces to establish a uniform electric field over the entire physical aperture.

REFERENCES:
patent: 3194961 (1965-07-01), Ewald et al.
patent: 3816748 (1974-06-01), Harrison
patent: 3979590 (1976-09-01), Andersen
patent: 4019989 (1977-04-01), Hazewindus et al.
patent: 4362945 (1982-12-01), Riecke
patent: 4697086 (1987-09-01), Ishitani et al.

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