Cleo radiation monitors went high and stayed there. Dumped electrons and the radiation dropped. S Occurs about every third fill or so. It seems to take only about 10 mA of e- to seal the leak, and pressures recover quickly. Positrons do not seal the leak.
Lifetimes recover immediately when leak seals.
Tried the installation of a vacuum dam, but no success, after more than 4 hrs struggle. F VGS graphics system hangs about once each shift. M Found that the Stabiline Voltage regulator for the Linac Modulator Warm-up power is not working properly. Only two of the three phases are regulating. Presumably the variac has a problem.