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| Laura Lambert wrote: |
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Thursday, October 02, 2014, 11:51
Target container sprayed with TaC, currently drying in fume hood
Monday, October 06, 2014, 12:11
Target container & back block is wrapped with 3 layers of Ta-heat shield. The chamber has been pumped down over the weekend.
Pressure currently at 2.23e-7 Torr.
HS water valves open; no leaks detected.
TGHT will be ramped up to 580A at 0.2A/min
TBHT will be ramped up to 230A at 0.2A/min.
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Monday, October 06, 2014, 12:16
Stepped up both TGHT/TBHT to 35A.
Tuesday, October 07, 2014, 12:54
TBHT reached to 230A/3.7V and TGHT is still ramping up, currently at 303A/4.5V. Temp measured with Omega-IR2 = 1165C with e'=0.85
Pressure @ 5.2e-7 Torr.
Increase ramping rate to 2A/min.
Tuesday, October 07, 2014, 16:21
TGHT is now at 580A and TGHT at 230A.
Temperature is measured with OMEGA-IR2, MIKRON, and analog pyrometer - All the measurements are agreed at 1700C (without the tantalum emissivity correction of 250C)
The OMEGA-IR2 slope has changed to 0.97 for the correction - The real temperature reading from the display is showing 1935C.
Now... attempting to low TBHT to see any temperature change.
Tuesday, October 07, 2014, 17:01
TGHT @ 580A.
TBHT = 180C, Temp = 1925C
TBHT = 130C, Temp = 1920C
Not much of change in the temperature on the target tube...
Tuesday, October 07, 2014, 17:07
Attempting to increase the temperature to 2000C
TGHT = 600A, Temp = 1955C
TGHT = 620A, Temp = 2000C
Target will continue heating at this temperature overnight... Will continue to monitor.
Tuesday, October 07, 2014, 20:59
After almost 4 hours of heating at 620A on TGHT, the temperature has dropped to 1980C.
Pressure is coming down to 1.17e-6 Torr.
Increased TGHT to 630A to maintain temp @ 2000C
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