J. Kissel, E. Hall, F. Clara

As per this April HAM6 vent's plan, E1600092, we've confirmed the functionality of the AS AIR and OMC REFL beam diverters, as well as the HAM6 fast shutter. Details of the test below. The tests required turning on the HAM6 High Voltage for the shutter, but we since have turned it off again now that or tests are complete.  All mobile ISC components are functional; ISC is a go for chamber closeout.

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Beam Diverters:
- The AS AIR and OMC REFL beam diverters did not need to be moved or disconnected at all during this vent, so testing their functionality was as simple as exercising the OPEN/CLOSE buttons on the corresponding Beckhoff MEDM screen and watching as the shutters cycled through the two positions. We were able to cycle both several times without issue.

Fast shutter:
To test the fast shutter we did the following (informed by LHO aLOG 17831)

This scenario: The chamber doors are open, the shutter is clearly visible, ISCT6 has been pulled away from the chamber, the trigger PD's input has been disconnected from the remote chassis, and the high voltage has been turned off.

Gather ahead of time: a portable DC voltage supply (it need only be capable of +5V) and associated BNC cable and adapter.

Process:
(1) Confirm that the HAM6 fast shutter remote chassis's power is OFF (both that the front-panel "HV Enable" little silver dip-switch is set to "disable", and the back panel power rocker switch is OFF). This chassis is located in the field rack just -Y of HAM6 at the bottom of the rack.
(2) Turn on the high voltage power supply in the Computer Electronics Room (CER) Mezzanine. Since the voltage and current adjust are analog dials, they are typically left at the right setting, so one only needs to turn on the power switch to the power supply. Once on, the voltage readback should show 250V, and the current readback should be hovering just above 0 A (i.e. *very* little current should be drawn).
(3) Return to the field rack, and turn on the back panel chassis power rocker switch.
(4) On the front panel, you should see the +/-15V light green, the computer screen light up, and after a few seconds the fault light will go red.
(5) Enable the HV from the front panel silver dip switch. The computer screen will indicate that the capacitator is charging up for ~10 sec or so. The fault light will remain on.
(6) Connect the DC voltage supply (with no voltage output) to the Fast Trigger Input. 
(7) As soon as you give the voltage supply 5 V, the shutter should pop up, and the fault light will go off.
(8) Cycle the 5V a couple of times to confirm expected functionality. If the shutter pops up and down as expected, then the shutter is functional.
(9) Disconnect the 5V voltage supply, flip the sliver dip switch back to "disable," turn off the power to the chassis via the back panel rocker switch, and turn OFF the high voltage power supply in the CER mezzanine.

NOTE This only tests the mobility of the shutter, it does not test the shutter logic or the timing. This requires ISCT6 to be in place, and light on a trigger PD, as per LHO aLOG 17831 cited above. We will test these critical components as soon as possible.