Beamline viewers

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The viewers on each girder go like this:

By girder
Y-chamber : two
Wien girder : four
A1/A2 girder : two
By screen
Laser => chromox w/ 10mm hole
At harp => YAG
All others => chromox no hole
By screen assembly
All have a shield at base of screen
Laser and Y retract into tack welded tube
Viewer assembly info
all bellows replaced
status Jan 15, 2021
Y/Laser installed in tunnel
(4) Wien => require extension rod
(2) A1/A2 => standard rod
New air cylinder modifications media:210115_ViewerOptions.docx