Sunday, March 12, 2023, 08:04

Ta HP-SIS was coated with TaC and wrapped with Ta heat-shields (3 layers + 1 inner layer around fins)

Desired temperature = 1850 C , TBHT will be set fixed at 230A (max).

Evap 2 will be pumped down over previous night

OMEGA slope= 0.990

Good vacuum = 5.00 e-4 Torr

Bad vacuum = 5.00 e-2 Torr

IGP1=1.9 e-07 Torr

Start autoramp @2A/min to120 A on TGHT and TBHT.

OMEGA target temp = 1850 C

Sunday, March 12, 2023, 13:08

start autoramp to 500A on TGHT @ 4A/min (2A/30s)

from 320A, 4.5 V on TGHT

IGP1= 6.8e-07 Torr

Sunday, March 12, 2023, 19:09

Starting ramp down @ -2A/min TGHT, and -1A/min TBHT

@687A, 10.7 V TGHT OMEGA = 1850 C

final pressure IGP1= 2.4e-06 Torr