Array for achromatic imaging of a pulsed particle ensemble
OwnerGerd Schonhense, Heinrich Spieckerinventors
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Abstract
An array for achromatic imaging of a pulsed ensemble of charged particles is described. The device comprises an imaging system with a round lens optics (2, 7), a low-energy drift space (3) and an accelerator (4-6) driven by at least one rapidly switchable voltage U(t), such that the velocity and/or trajectory of the particles in the ensemble is influenced and the particles starting from point (1) with different energies are crossing the image plane in one point (8), i.e. the chromatic aberration of the optics is compensated.
Claims15
An array for achromatic imaging of a pulsed particle ensemble comprising:
- means for imaging containing at least two particle-optical round lenses 2, 7, a low-energy drift space 3 that gives rise to an energy-dependent axial expansion of the particle ensemble and means for changing the energy distribution of the particle ensemble located between the drift space and the second lens 7 such that an electrode arrangement (4, 5, 6) facilitates the generation of a pulsed axial electric field.
An array for achromatic imaging of a pulsed particle ensemble comprising:
- an imaging system with at least one particle optical round lens (7), a preceding low-energy drift space (3) for energy-dependent axial expansion of the particle ensemble, such that the focal width of the round lens (7) is actively varied during the passage of the particle ensemble such that well-focused imaging is obtained for all particle energies.
Dependencies are inferred from the claim text.