A short magnetic focusing device and method for transverse compression of ultrafast electron pulses

Abstract

The present invention belongs to the ultrafast diagnostic technique field and relates to a short magnetic focusing device and method for the transversal compression of ultrafast electronic pulses. The short magnetic focusing device comprises a tubular linear shaft and a tubular inner magnetic shielding shell which are arranged coaxially; the short magnetic focusing device further comprises two outer magnetic shielding shells, wherein the first outer magnetic shielding shell and the second outer magnetic shielding shell are axially buckled to the outer side of the inner magnetic shielding shell along the axial direction of the linear shaft; the center of the first outer magnetic shielding shell is coaxially provided with a first pole shoe extending into the linear shaft; and the center of the second outer magnetic shield shell is coaxially provided with a second pole shoe extending into the linear shaft; a magnetic gap is formed between the first pole shoe and the second pole shoe; and a buckling position of the outer magnetic shielding shells is provided with a magnetic gap adjustment device; the outer end surfaces of the outer magnetic shielding shells are provided with coaxial adjustment devices; and cooling systems are arranged between the inner end surfaces of the outer magnetic shielding shells and corresponding baffles. The short magnetic focusing device and method of the invention have the advantages of effective cooling of coils, fine adjustment of coaxiality, fine adjustment of the gap of the pole shoes, and long-time stable work.

Description

technical field [0001] The invention belongs to the technical field of ultrafast diagnosis, and relates to a short magnetic focusing device and method for transversely compressing ultrafast electron pulses. Background technique [0002] Human beings' understanding of the natural world is getting deeper and deeper into the microscopic world. The most essential processes that reflect the appearance of the material world all occur inside molecules or atoms, and their corresponding time scales are all on the order of picoseconds, femtoseconds or even attoseconds (called ultrafast processes), which can be described as "everything changes". The in-depth understanding of these ultra-fast processes does not require the use of diagnostic tools with ultra-high spatio-temporal resolution to make up for the lack of human eye resolution (1 / 24 second & 0.1 mm). Ultrafast electron diffraction (UED), ultrafast electron crystallography (UEC), ultrafast electron microscopy (UEM) and streak c...

AI Technical Summary

Problems solved by technology

[0011] In order to solve the technical problems of poor cooling effect, difficult coaxial adjustment and high manufacturing cost of the existing pulse transverse compression device, the present invention provides a short magnetic focusing device for ultrafast electronic pulse transverse compression

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