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Update generators.py.in #93

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latompkins merged 1 commit into from
Jun 9, 2023
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Update generators.py.in #93

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6 changes: 4 additions & 2 deletions python/generators.py.in
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Original file line number Diff line number Diff line change
Expand Up @@ -200,10 +200,12 @@ def single_4gev_e_upstream_tagger() :
the field and arrive at the target at approximately [0, 0, 0] (assuming
it's not smeared).

The gun position below requires the particles to be fired at 4.5 degrees.
The gun position of [ -27.926 , 0 , -700 ] # mm requires the particles to be fired at theta = 4.5 degrees.
The gun position of [ -27.926 , 0 , -880 ] # mm requires the particles to be fired at theta = 5.65 degrees.

The direction vector is calculated as follows:

dir_vector = [ sin(4.5) = .3138/4, 0, cos(4.5) = 3.9877/4 ]
dir_vector = [ sin(theta), 0, cos(theta) ]

Returns
-------
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