1. Deadtime Sensitivity Trigger rate varies over a wide range DCH quadrant 0 (upper east) drives high deadtime periods Do backgrounds target upper east DCH? Are we just that close to the DT thresh? Is this trickle related? Factor 2 DCH readout improvement Nov’05

2. Incoming HER gauges Long time constants but levels are low (~0.1-0.2 nT) A leak? Near the known outgassing source Levels are high Time constants are long, and current is not the only factor

3. Incoming HER pumps These pumps see the LER current changes rather than the HER (photo-electrons from LER sync rad?) No thermal time constants.

4. Near incoming HER pumps HER current more visible in this one. It’s also closer to the outgassing source, but no thermal time constant. The first outgoing LER gauge, but sees the HER outgassing. (pre) abort activity?

5. Incoming LER Long time constants but low levels Large values (photo-electrons?) where’s the signal?

6. Far Outgoing LER High levels (pe?)