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Thursday, May 30, 2013, 16:16
The target container was previously coated with TaC and sintered in Evap 2.
The target is loaded with 250 discs of UCx (material from batch#03_02042013)
Total length = 8.9cm
The container is wrapped with 3 layers of Ta-heat shield, including the back block.
A regular TaC coated/sintered endcap is inserted on left, wrt to the ionizer tube pointing out of the page. The right end is open with no cap.
(Did not use a D-cap... trying out this method. Need to be careful when handling the target!)
The chamber is dumping down.
Instructions for conditioning the UCx target:
1. TGHT will need to heat up to ~175A to burn off the organics.
Parameter setup: 5.0e-5 good vac, 6.0-5 bad vac. The auto-ramping rate is set to 0.1A/min.
2. Once the organics have burnt off, ramp down the TGHT to 0A at 2A/min.
3. Purge the glovebox with argon gas.
4. Vent the chamber with Ar gas. Close the valve when it is completely vented.
5. Remove the target. Be careful the left end (view from the top) is open with the D-cap.
6. Clean the chamber with TCE and remove all the gunge.
7. Install the target back
8. Pump down the chamber to at least low 10e-6 Torr before begin the final carbonization process.
9. Auto-ramp the TGHT current to 175A at 1A/min.
10. Once the TGHT reach to 175A. Auto-ramp TGHT to 520A at 0.1A/min.
11. At 520A, keep heating the target for at least 4-5 hours.
12. Auto ramp TGHT to 0A at 2A/min.
13. Purge the glovebox with argon for at least 5 min
14. Vent the chamber with argon gas. Close the vavle when it is completely vented.
15. Remove the target from the chamber and put in the "orange box" and transport to the Ar-glove box.
Done!
Friday, May 31, 2013, 18:17
Chamber has pumped down to 6.7e-6 Torr.
Ramping up TGHT to 175A.
Wednesday, June 05, 2013, 11:14
TGHT reached to 227A/1.99V. (see attachment#1)
TGHT is ramping down to 0A to clean up the chamber before continue with the conditioning.
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