Gun vacuum response to the gun HV tripping off
Notice how the gun vacuum was recovering after the HV trip off, then at 16:29:03 the gin IP current increases, instead of continuing to drop. Then it stabilizes and decrease again very, very slowly (Fig. 2. ).
Fig. 3. shows the voltage at that time was 5 kV.
No evidence of HVPS curren precursor, Fig. 4. Gun was delivering 60 uA for beam ops before the HV tripped off.
There is no indication of precursor field emission from the anode current either, Fig. 5. Nor from DecaRads (Fig. 6). The signal shown by DecaRads is from beam.










