open_valve()
set_pol_cplus(offset = None)
wait_beam()
set_file('Se_plus')
otf(start=1410, end=1510, time=3, delay=5)

set_pol_cminus(offset = None)
wait_beam()
set_file('Se_minus')
otf(start=1410, end=1510, time=3, delay=5)

set_pol_cminus(offset = None)
wait_beam()
set_file('Se_minus')
otf(start=1410, end=1510, time=3, delay=5)

set_pol_cplus(offset = None)
wait_beam()
set_file('Se_plus')
otf(start=1410, end=1510, time=3, delay=5)
close_valve()