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The telescope + DUT assembly are mounted on a remote controllable XY stage (X=horizontal transverse to beam; Y=vertical) to align to the beam. During new test beam periods, this is typically done initially using alignment lasers in conjunction with fiducial markers to center to expected beamline within ~5mm. The vertical position is easier while horizontal centering is still somewhat awkward. Once positioned close enough, the refined alignment is done with the beam data in telescope. For both laser alignment and beam alignment, the position adjustments for the whole telescope (including DUT mounted within it) is done with the "XY Stages" EPICS panel that is accessible from the ESTB main panel shown above. The vertical adjustments are somewhat slow to complete while horizontal adjustments are faster.
Beam Trigger
The "Triggers" panel on the ESTB EPICS GUI brings up the Experimental Triggers panel where channel 10 (Silicon Tracker) controls the beam trigger LEMO signal going into the TLU Chan 0 PM in trigger port. The Delay value is the critical control of timing that DUT is very sensitive to, while EUDET seems to work with a wide range of delays automatically. The Trigger width parameters didn't appear to have much effect on anything.
Beam Dump Monitor
The beam dump monitors, Lead Glass (LGdump) dump, and Front/Read dumps are a key monitoring tool to give direct look at the beam intensity. ESTB GUI "Scope ESA" panels is particulary useful as a standard monitor for instantaneous beam status as scope pulses. "ADC Chanls"/"Histograms" panel displays the instantaneous values and distributions of energy measurements of various dumps. "HV SY403" can be used to adjust HV values for different intensity measurements.
Remote Power Strip Control
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