New filament continued Jan 2013

Monday

Gun on Monday morning after mysterious shutdown over the weekend.

Initial extractor current 84.8 uA, was 108 uA with beam off Friday afternoon.

1 kV, 73.8 uA, gun vac jumps to 1.8e-9 and rising slowly, 156 pA for 30 um standard aperture

After 30 min Iext up to 99.6, gun 4e-10
After 70 min, 88 uA at 5 kV, 2.25e-9 vac

Noon, ext 108.5 beam off, 7e-10 vac

Around 2:30 gun shuts down. This time got error "519 EHT Set Extractor Trip"

At 3:15 gun shut down again, no clear reason, no error message.

Gun runs through the afternoon. EHT off now 114.2, was around 94.5 @ 1 kV.

Turn on EHT 1 kV, see if it runs through the night. Now 8:30 pm.

Tuesday

This time gun did not shut down. Ext current relatively stable, starts 94.7 ends 95.5. Gun vac drops slightly, starts 3.0e-9 ends 2.7e-9

Gun off 115.3 uA, pressure 1.0e-9 within a minute.