Good performance with flipped polarity as it was also observed with nominal polarity. Vacuum level variations no thigher than 1% compared to background with +/-20kV and with -/+20kV per electrode plate biasing.
I will turn voltage off and keep the V-Wien under vacuum at UITF until ready for electrode plate gap re-alignment for better parallelism.
Day #51, Week 11 Day 3, Wrap-Up:
* V-wien HV testing continued today with flipped polarity on
the electrodes. <1% vacuum rise with plates at +/-20kV,
where they'll soak overnight. 3859016
* CEBAF lasers configured to allow for hut->Y-chamber-
* Gun HV Interlock system documentation and
preparations for upgrades continue
Other Injector SAD Work --
* PSS upgrades continue
The CEBAF V-Wien HV testing continued today at UITF, this time with flipped polarity (Left electrode plate per beam direction convention biased negative, and right electrode plate biased positive).
Following the same protocol as the yesterday's test with 'nominal' polarity, we ramped the negative voltage first to -20kV, then ramped to zero. Next the positive voltage was ramped up to +20kV and back to zero. Anf finally, starting from zero volts, both electrode plates were ramped simultaneously to 20kV.