Beam Line Data is smaller data that can be delivered to all hutches (i.e. not associated with the DAQ system in one hutch). This script lives in /reg/g/psdm/tutorials/examplePython3/bld.py.
from psana import *
ds = DataSource('exp=xpptut15:run=59:smd')
ebeamDet = Detector('EBeam')
for nevent,evt in enumerate(ds.events()):
ebeam = ebeamDet.get(evt)
if ebeam is None: continue
print(ebeam.ebeamPhotonEnergy())
break
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