J. Kissel

Yet more measurements of charge -- I've taken two more data points on H1 SUS ETMY and one on H1 SUS ETMX. 

I managed to start and complete the measurement of ETMX exactly as the EX Ion pump was turned on and the arm was opening. Note, that the green laser had been injecting ~30 [mW] into the vacuum system since last night. The results show little-to-no charge, clustered around zero. We'll get a few more measurements over the next day to see how an open arm, with green light is affected. Remember, we didn't see much charge change between ion pumps valved in vs. valved out, or with green light for ETMX.
      P [V]       Y [V]
UL   42.6    41.6
LL   46.4    40.9
UR   40.3    20.6
LR   28.9    30.6

For the two ETMY measurements, the configuration has remained identical since Tuesday Aug 26, namely with the ion pump open. Indeed, as suspected, the three measurements over the past 48 hours show significant variation in charge, unlike with the pump valved out. I'm still waiting for Borja to get me the previous data in an easily digestible form so I can make a nice comparison plot over time, but for now, I just report the charge over time via the table below.
Pitch
       2014-09-02    2014-09-03    2014-09-03
        1937UTC       1550UTC      2339UTC
UL [V]    104          101           119
LL [V]    129         -5.51         -15.9
UR [V]    110         -22.4         -76.6
LR [V]    104         97.8          101

Yaw
       2014-09-02    2014-09-03    2014-09-03
        1937UTC       1550UTC      2339UTC
UL [V]    149          160          196
LL [V]    72          13.3         -13.1
UR [V]    13.6        -32          7.17
LR [V]    117         112          91.4