Marla Cervantes wrote:

Laura Lambert wrote:  Wednesday, June 14, 2017, 15:49 Pellets previously made by Marla and weighed. Pellets are placed inside a small graphite sample tube. Graphite sample tube loaded with pellets is loaded into a previously TaC coated boat. Boat is wrapped with 3x Ta heat shields. Loaded into evap2. Chamber currently pumping down.  Thursday, June 15, 2017, 11:24 HS water valves were opened this morning, no leaks detected. Tapped up manually to 50A, 0.44V Vacuum currently rising starting to settle. IGP1 = 1.51e-6 Torr. One vacuum stabilizes will initiate auto ramp at a rate of 1.0 A/min up to a final set point of 150 A. Final desired temperature of 1800C.    Friday, June 16, 2017, 10:37 IGP1 = 7.91e-7 torr. TGHT = 167 A, 2.3 V. Tapped up manually to 350A yesterday, remained there overnight. IGP1 = 4.55e-7 torr TGHT=350 A, 5.6 V, Changed slope to 0.98 Checked temperature readings with mikron to confirm slope Mikron LS = 1260C, RS=1290C OMEGA= 1295C Initiating auto ramp at 1.0A/min to a final set point of 450A. Final desired temperature of 1600C (no longer need to go to 1800C). *note: graphite sample tube has graphite endcaps inserted

 Friday, June 16, 2017, 15:10

Tapped up manually to 420A and auto ramp at 1.0A/min to 450A.

IGP1= 7.15e-7 torr

TGHT=450 A, 7.85 V

OMEGA = 1605C

Process completed, initiating auto cool at 1.0A/min

Elog entry by Pauline

 Monday, June 19, 2017, 16:18

Vented in air and removed from evap2 this a.m.

Weirdly TGHT had tripped off at 10pm on friday June 16th

TGHT = 58A when it tripped off.

Nothing else tripped.

Power supply was still on.

Water was still running

But, in the epics water control box it showed green boxes for TGHT, HS and CHILLER...but all said trip in yellow next to the boxes...odd...

Also noted, before removing from evap2, noticed both legs were bent and touching heat shield, will look further into this...