I sprayed helium around the areas of interest on IP12 today and again, like yesterday, experienced a response on the leak detector, albeit, a delayed response.  This seems like some sort of cross-talk to a remote leak or, perhaps, permeation is taking place.  The signal falls off when the locally mounted turbo is isolated implying that IP12 is the source of helium.  Even so, I went ahead and energized the HV while the turbo was still  valved-in followed by valving-out the turbo after the initial liberation of gas had been pumped away.  I monitored the ion pump controller (GammaVacuum LPCe) while the HV "slowly" ramped up to 5,800 volts.  The current/pressure is higher than I would have expected.  Perhaps this can be explained by the fact that it has only had ~4 hours of turbo pumping (10 L/s net) since having been vented (dry N2) and installed (exposed to room air for "hours").  Also, the controller displayed "High Voltage not Detected" a couple of times during the ramp up and the HV had to be re-enabled in order to get this message to clear.  I suspect that this could be due to a poor grounding of one of the two SHV connectors at the pump end as neither connector has both mounting screws (threaded hole galled with broken-off screw). 

I'll continue tomorrow - coordinating with the commissioners.