Laura Lambert wrote:

Laura Lambert wrote: Laura Lambert wrote:  Wednesday, April 05, 2017, 15:36 Coated container with TaC coating using spray technique this morning and let dry. Wrapped with one long layer of Ta heat shield, wrapped around boat 3x No ends to target boat Installed in evap2 and pumping down now...    Thursday, April 06, 2017, 08:56 Problems with IGP2 Won't turn on, has low voltage output. See screenshot attached.    Thursday, April 06, 2017, 11:12 Turns out it was just a bad connection. See attached photos.

Thursday, April 06, 2017, 13:16

HS water valves opened, no leaks detected.

Tapped up manually to 35A

Waited almost 2hrs

IGP1 = 9.9e-7 Torr

Initiating auto-ramp at 0.2A/min to 400A

Final desired temperature = 1900C

OMEGA slope = 0.98

Good vac at 3.0e-5, bad vac at 4.0e-5 Torr.

 Monday, April 10, 2017, 09:26

IGP1 = 1.79e-7 Torr

TGHT = 400A, 6.47V

OMEGA = 1505C

Tapping up manually to 1900C...

 Monday, April 10, 2017, 11:46

TGHT tripped off at 410A, ~1530C

Water is still on and good flow.

Vacuum was stable ~1.8e-7 Torr.

No power trips according to controls.

Not sure of reasoning behind trip.

Initially tried tapping back-up, no current was being applied.

Turned off and back on TGHT power supply - this restarted things and now works again.

Have tapped back up to 35A, vacuum still good.

Restarting auto-ramp to 400A at 1.0A/min

 Monday, April 10, 2017, 13:13

Vacuum looks good.

IGP1 = 1.1e-7 Torr

TGHT = 127A, 1.30V

Increasing ramping rate to 2.0A/min

 Monday, April 10, 2017, 16:08

IGP1 = 1.5e-7 Torr

TGHT = 400A, 6.24V

OMEGA = 1510V

Increasing auto ramp setpoint to 450A at a rate of 0.2A/min

 Wednesday, April 12, 2017, 11:06

IGP1 = 2.96e-7 Torr

TGHT = 555A, 9.74V

OMEGA = 1935C

Has remained at max setpoints overnight.

Initiating auto-cool at 2.0A/min

 Thursday, April 13, 2017, 11:59

vented in air and opened up this morning.

container looks good.

see photo attached.