Add rectangular trapezoidal shape of electron beam#3

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Allessyer wants to merge 4 commits intoAngelFP:masterfrom

Allessyer:master

Commits on Feb 11, 2022

Commits on Mar 2, 2022

Add a rectangular trapezoidal smoothed longitudinal profile
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Commits on Mar 4, 2022

Update rectangular trapezoidal smoothed shape
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