Thursday, November 23, 2017, 14:54

Graphite insert loaded into previously TaC coated target boat.

One endcap removed to allow for outgassing: left side out, right side in.

Weight of graphite tube + single endcap = 10.2012g

Same Ta heats shields remain on container from sintering TaC coating.

Currently pumping down in evap2.

Friday, November 24, 2017, 11:31

IGP1 = 4.52e-7 Torr

IGP2 = 3.43e-7 Torr

OMEGA slope = 0.98

Good vac at 3.0e-4, bad vac at 8.0e-4 Torr.

HS water valves have remained open since the last time evap2 was used.

No leak check done.

Tapped up manually to 50A.

Vacuum stable.

IGP1 = 5.34e-7 Torr

IGP2 = 5.54e-7 Torr

Initiating auto ramp for TGHT @ 0.2A/min to a max setpoint of 300A

Once max setpoints achieved, will tap up manually to final desired temperature of 2000C

Uranium targets go to a max temperature of 1950C online, so graphite insert should be tested to 2000C

 Monday, November 27, 2017, 10:15

IGP1 = 2.5e-7 Torr

IGP2 = 1.9e-7 Torr

Reached 300A, 4.61V

OMEGA = 1298C

Tapped up manually to 485A, 8.46V

OMEGA = 1808C

Remained at this setpoint for a day

Tuesday, November 28, 2017, 15:41 

IGP1 = 3.88e-7 Torr

IGP2 = 3.58e-7 Torr

Tapping up to 2000C...

Tuesday, November 28, 2017, 16:10 

TGHT = 570A, 10.20V

OMEGA = 2005C

IGP1 = 9.64e-7 Torr

IGP2 = 1.05e-6 Torr

There was a minor drop in voltage at 540A, 9.58V - dropped to ~9.4V then slowly went back up to 9.58V [see photo]

Will remain at this setpoint overnight and cool down in the a.m.

 Wednesday, November 29, 2017, 08:48

Voltage increased slowly while sitting at max setpoint of 570A [see photo]

TGHT = 570A, 11.20V --> voltage increased by 1.0V over ~16.5hrs

OMEGA = 2114C

IGP1 = 6.6e-7 Torr

IGP2 = 6.5e-7 Torr

Initiating auto-cool at 2.0A/min

 Wednesday, November 29, 2017, 16:15

Vented in air and removed today.

Will update tomorrow with results and photos.