Friday, October 07, 2022, 07:55
Cartridge-220928UCx was installed in the EVAP1 and pumped down yesterday.
Material will be reduced in LP-SIS wrapped with 3 Ta foils.
IGP1 = 2.1e-6 Torr
a cap was installed to collect material coming out from the ionizer tube
The initial weight of the cap 1 + small bag was recorded to be: 2.82 g Final weight of cap1 + small bag = 2.84g (see attached picture)
Good vacuum = 5e-4 Torr
Bad vacuum = 5e-2 Torr
Power desired 1900W as approximate power used online.
Will autoramp @2A/min to 30A, then slow down ramp to 1A/min to 120A.
After first pressure bump cleared, will ramp up to 400 A @ 2A/20s to 425A on TGHT. TBHT will be topped off at 230A.
from 425A, TGHT will be ramped at 1A/min and monitored for pressure behaeviour.
sytem will be left at reduction current for 4 hours. Then, the current will be dropped to 1900W and allow to run for 8 hours.
The cup will be collected and the system will be run again in increments of two hours.
*slight change from test plan to save time*
Friday, October 07, 2022, 21:55
A true pressure max was not observed. A max while current still rising. stopped at 560A on TGHT and 5.3V
will leave at the above conditions for 4 hours.
Suspect that the thinner Ta shields make a difference. Suggest to add a fourth shield and process the previous cartridge in a tube rather than a boat. Treat for four hours (pressure max) and then test increasing the current to see if there is a pressure bump. If no pressure bump then lower current to deposit 1900W for 8 additional hours.
After 4 hours at max current, the current was dropped to 450A (TGHT) and left for 8 hours.
Saturday, October 08, 2022, 09:26
start autoramp down @-2A/min for TGHT and -1A/min for TBHT
Cap+ bag = 2.82 g
final cap +bag = 2.84 g
Tuesday, October 11, 2022, 10:15
Today will switch end-cup. Will weigh new end-cup and place inside the evap1 glovebox. Then will remove used end-cap and install new end-cap. Used end-cup will be weighed on same balance as before. All mass measurements will be done with the same balance. Note, that a makeshift balance air isolation container was built to allow balance to not be affected by air currents.
Cap 2+bag initial weight = 2.80 g +/- 0.01 g
Cap 2+bag final weight = 2.81g +/- 0.01 g
No visible deposition on cap
Wednesday, October 12, 2022, 07:51
Start ramp up at 2A/min. TGHT to 450A, TBHT to 230A
IGP1= 6.7e-07Torr
Wednesday, October 12, 2022, 09:47
Ramping up @ 4A/min to same final settings: TGHT = 450A and TBHT = 230A
Wednesday, October 12, 2022, 11:15
@10:45am 450A, 4.15V were reached on TGHT
Will leave for 2 hours at 450A then ramp down, then switch cap.
Monday, October 17, 2022, 09:40
The second cap was taken out over the weekend (attachment number 2).
The final weight of this cap with bag = 2.81 +/- 0.01 g
Installed a nex cap (3) with initial weigh of cap +bag = 2.74 g
Allowed vacuum to settle over Sunday and will start ramping today
Will ramp to 470 A and hold for 2 hours. Ramp rate 2A /30s
IGP1= 4.6e-07 Torr
Monday, October 17, 2022, 11:39
ramping with no issues. will finish ramp around 12:03 pm and will start rampdown @ around 2:05 pm.
Monday, October 17, 2022, 12:03
TGHT= 470A, 4.5V
TBHT= 228A, 2.9V
IGP1= 5.6e-06 Torr
Monday, October 17, 2022, 14:05
Start rampdown at 2A/min TGHT and 1A/min TBHT to zero amp
current IGP1= 2.6e-06 Torr
TGHT = 470A, 4.5V
TBHT= 228.3A, 2.9V
Tuesday, October 18, 2022, 09:39
IGP1=4.4e-7 Torr
ready to dismount
Tuesday, October 18, 2022, 13:50
Cap 3 + bag initial weight = 2.74 g
Final weight of cap+bag = 2.74 g (no change)
no visible deposition on cap either |