Wednesday, March 18, 2020, 07:10

Ta tube was coated with TaC and wrapped with Ta heat-shields (3 layers)

Desired temperature= 1900 C (expected TGHT ~430 A), TBHT will be set fixed at 230A (max).

Evap 2 was pumped down on the previous night.

Good vacuum= 3.00 e-5 Torr

Bad vacuum = 5.00 e-5 Torr

Ramped TGHT and TBHT to 40A at 0.5A/min

Initial pressure IGP1 = 4.8e-7Torr

 Wednesday, March 18, 2020, 09:29

After an hour pressure reduced to 5.45e-6 Torr

TGHT; 0.518 V, 40.5 A

TBHT: 0.41 V, 38.6 A

Autoramp TGHT and TBHT at 1A/min to 400A and 230A respectively.

 Wednesday, March 18, 2020, 18:29

TGHT = 400A, 6.6V, TBHT= 232.9, 3.9V

OMEGA = 1240 C, this is 500 degC lower than previous LP-SIS at same conditions

https://elog.triumf.ca/TIS/Evaporator_2/464

Start autoramp to 460A on TGHT at 1A/min

Wednesday, March 18, 2020, 20:51

TGHT: 464 A, 7.75 V

Temperature 1328, I won't increase the temperature because there is a chance that the reading is 500 degC off and the target is sitting at 1828 degC instead of 1328 degC 

Wednesday, March 18, 2020, 23:17

After ~4 hours at 1317 degC according to the pyrometer:

TGHT = 7.7 V, 457.8 A,

TBHT = 3.9 V, 232.9 A,

IGP1 = 1.16e-6

Commence cooling at -2A/min for TGHT and -1A/min for TBHT

Thursday, March 19, 2020, 15:53

Venting and dismounting.

The coating does not have the quality to be used online, another LP-SIS will be coated and sinter