Laura Lambert wrote:

John Wong wrote: Laura Lambert wrote:  Tuesday, June 30, 2015, 13:28 Target container was previously coated with TaC spray and sintered. It's is wrapped with 3 layers of Ta-heat shield, including the center block. The target consists of 221 discs of UCx with 7.5cm in length. A regular TaC coated endcap is inserted left, wrt the ionizer tube pointing down, so the right is open - discs are held on with Ta wire spring. The chamber is currently pumping down. TGHT will be ramped up to 520A at 0.1A/min Parameter setup: 5.0e-5 good vac, 6.0e-5 bad vac.  Tuesday, June 30, 2015, 14:43 IG1 = 1.8e-5 Torr. Tapped up manually to 30A. Vacuum stable; IG1 = 1.2e-5 Torr. Initiating auto-ramp.  Thursday, July 02, 2015, 08:41 EVAP1 was tripped off due to backflow preventer test this morning. IG1 - 4.2e-6 Torr. Tapping back-up manually before re-initiating auto-ramp.  Thursday, July 02, 2015, 11:49 Tapped up manually to 85A, 0.65V IG1 = 3.6e-6 Torr. Initiating auto-ramp.    Thursday, July 02, 2015, 12:58 NOTE:  Before venting the EVAP1 chamber, the Ar line must disconnect from Peter's sampling chamber (inside the fumehood) and connect back to the EVAP.     Friday, July 03, 2015, 13:42 water valve tripped off at ~1pm, which subsequently tripped off the TGHT [see photo] currently trying to figure out what caused this to occur before re-starting....  Friday, July 03, 2015, 14:47 All water valves look good, flow is good. WV turned back on, TGHT turned back on.  Tapped back up manually to 20A. IG1 = 2.3e-6 Torr Initiating auto-ramp at 0.1A/min with a max setpoint of 150A over the weekend. Will continue to ramp up monday.   Approved by Peter Kunz.  Monday, July 06, 2015, 09:29 TGHT reached 150A 1.5hrs ago. Vacuum stable. IG1 = 2.7e-5 Torr. Re-starting auto-ramp at 0.1A/min with a max setpoint of 520A.

 Wednesday, July 08, 2015, 10:44

The carbonization process is complete; chamber vacuum is stabilizing at 9.5e-6 Torr. 

Currently TGHT is at 430A.  Increased TGHT ramping rate to 1A/min.  Target should be at max current (520A) in 1.5 hours, so TGHT can be ramped down around 4:30pm today. 

 Wednesday, July 08, 2015, 16:36

TGHT at 520A/5.884V for over 4 hours.  Pressure coming down, currently at 1.42e-5 Torr. 

Initiated cooling at -2A/min. 

Chamber can be vented in Ar tomorrow and the target will be inspected.

Thursday, July 09, 2015, 17:08  

The target was taken out from the evaporator and inspected. 

Some "burnt" marks on the ionization legs can be observed and also the centre support leg is bent.  (see photos#1)

Not sure if the centre leg came in bent after machining or it happened during the carbonization process??  Do not have photos of the container before the process to compare.  

A few things to note…  During the process, the power supply did tripped off twice due to the cooling water valve shut off. (see photo#2).  An assumption is that sudden cool down of the hot target might have caused the quenching effect. 

No other visible damage.  

End caps are inserted and ready for assembly.

Link to photos:  https://www.dropbox.com/sh/c1ake0fu4x7lckc/AAD0F8TVRrpCbbHquEvSkyYIa?dl=0

 Thursday, July 30, 2015, 17:10

The mixture of UO2/C was prepared on July 13, 2015.  See screen shot for more info. 

The material is loaded into a target boat and wrapped with 3 layers of Ta-heat shield. 

 Chamber is currently being pumped down

Target boat will be ramped up to 520A at the rate of 0.1A/min

Vacuum limit stop at 5.0e-5 Torr, backing off at 6.0e-5 Torr.

 Friday, July 31, 2015, 14:33

Chamber has been pumped down overnight, currently at 3.3e-6 Torr.

Manually stepping up to 35A.

Set auto ramping TGHT to 200A at 0.1A/min for over the long weekend.  This current should be safe to just burn off the organic binder but not to start the carbonization process. 

 Monday, September 14, 2015, 15:28

Green cast dried UO2/C + organic mass = 61.31g

The green was rolled up and wrapped in a piece of graphite sheet.

The Ta-target boat is wrapped with 3-layers of heat shield and installed in Evap1.

 Wednesday, September 16, 2015, 17:55

The work in the B2 level is done; the nuclear ventilation for the evaporators is now operational. 

Tried to turn on the backing pump, but failed. 

Submitted an fault #8428 to vacuum group

 Thursday, September 17, 2015, 12:23

Vacuum group responded to the e-fault, and a new pump is installed.

Chamber is currently being pumped down.

 Friday, September 18, 2015, 14:12

Chamber pressure is at 3.0e-6 Torr.

TGHT stepped up to 30A.

Target boat will be ramped up to 520A at the rate of 0.1A/min

Vacuum limit stop at 5.0e-5 Torr, backing off at 6.0e-5 Torr.

 Friday, September 18, 2015, 16:05

Pressure stabilized at 3.6e-5 Torr. 

Initiate autoramping

 Monday, September 21, 2015, 11:38

TGHT was found tripped off at 50A on Saturday at about 6am; the backing pump gauge went up to 150mTorr at the same time (see attachment)

Note that a refurbished backing pump was installed before starting this process.  It could be a leak somewhere; will let vacuum group to inspect this. 

 Monday, September 21, 2015, 15:34

Vacuum group took a look at the pump.  It was the bleeding valve that was not properly close while the pump was installed.  So after some period of running, the valve got loosen from the pump's vibration and caused the leak. 

The pump is now back to operational. 

Chamber is being pumped again.  Once the vacuum is good, TGHT will be stepped up to 50A and autoramping will be initiated once it's ready.

 Monday, September 21, 2015, 17:51

TGHT at 50A, IG at 3.6e-6 Torr.

Initiated autoramping.

 Wednesday, September 30, 2015, 10:11

TGHT has reached to 520A/5.36V.  The carbonization process is complete, vacuum at 3.29e-6 Torr, BP at 12mTorr. (see attachment#2)

Initiated auto-cooling at 2A/min.

Thursday, October 15, 2015, 15:52

Target container previously sintered with TaC in Evap#2 - Target current at 440A, temp measured at 1900C.  A few tests on the temp measured were done (see Evap#2 elog #251 & 252). 
Note:  This is the new design container with a small back block.

Container is loaded with 245 discs of UC2; measured disc length 7.5 cm

A regular TaC coated endcap is inserted left, wrt the ionizer tube pointing down, so the right is open - discs are held on with Ta wire spring.

3 layers of Ta-heat shield is used. 

Target heater will be ramped up to 440A (according to the achieved temperature from Evap#2). 

Ramping rate at 0.1A/min.

Monitor closely on the vacuum around 400A to see if the carbonization process is complete. 

Chamber is currently being pumped down. 

 Friday, October 16, 2015, 10:33

Chamber has pumped down to 2e-6 Torr. 

Stepping up TGHT to 70A/0.23V. 

 Friday, October 16, 2015, 14:55

TGHT stepped up to 70A, pressure went to max 5.7e-5 Torr and it's coming down.

Initated autoramping.  (good vac at 5e-5 Torr, bad at 6.0e-5 Torr)

 Thursday, October 22, 2015, 12:26

TGHT has reached 440A/4.403V and stablized for about 5 hours. 

Pressure started coming down at around 370A which indicated the ending of the carbonization process. 

Currently vacuum is at 5.6e-6 torr. 

Initiated cooling down process at 2A/min.

Laura Lambert wrote:

Thursday, February 18, 2016, 15:34 Target container was previously coated with TaC spray and sintered. Container is wrapped with 3 layers of Ta-heat shield, including the center block - same method as for sintering TaC coating [new wrapping method-see elog112 eva2]. The target consists of 244 discs of UCx with 7.8cm in length. A regular TaC coated endcap is inserted left, wrt the ionizer tube pointing down, so the right is open The chamber is currently pumping down. TGHT will be ramped up to 520A at 0.1A/min Parameter setup: 5.0e-5 good vac, 6.0e-5 bad vac.  Friday, February 19, 2016, 08:28 IG1 = 4.7e-6 Torr Tapped up manually to 35A. Waited ~1hr, vacuum stable IG1 = 3.8e-6 Torr. Initiating auto-ramp.

 Friday, February 26, 2016, 10:26

Target has been heated at 520A for 10 hrs.

Vacuum at 5.3e-6 Torr. 

Initiated cool down at 1A/min. 

Remember to vent with Ar. 

Tuesday, August 23, 2016, 17:33

Target boat coated with TaC (sprayed) and wrapped with Ta-heat shield. 

chamber is currently being pumped down. Vac currently at 3.3e-5Torr. 

TGHT to be ramped up to 580A.

Initiate autoramping at 0.1A/min

 Wednesday, August 24, 2016, 10:34

TGHT at 111A/1.07V.  Vac at 7.5e-6 Torr and coming down.

Increase ramping rate to 2A/min.

 Thursday, August 25, 2016, 12:01

TGHT has been stabilized at 580A/6.89V for over 24 hours.  Vac at 7.5e-6 Torr.

Initiated cooling at 2A/min.

 Monday, September 12, 2016, 17:30

Container was properly sintered.

Monday, September 12, 2016, 17:30

A bunch of end caps (12?) and a long Ta-wire in spring sharp  were coated with TaC coating and wrapped in a small sheet of graphite foil. 

Container is then wrapped with a sheet of Ta heat shield.

These caps and wires will be sintered in Evap 1, so they may be prompted to contamination from the uranium processes. 

I have no choice but to use Evap1 to do this work since we are falling behind with the schedule.  

In the future, please have all the materials (targets, end caps, binder, etc) well prepared. 

I do not know what is the required current to sinter the caps since there is no temp measurement.  So, the best is to go with how the container was sintered, 580A. 

Monday, September 12, 2016, 17:36

Chamber has been pumped down to mid 10-6 Torr. 

Auto ramp to 580A at 2A/min.

Laura Lambert wrote:

Monday, November 07, 2016, 13:29 UO2/C green was prepared Nov 3rd, 2016. This is the first cast made with the new batch of UO2 [but from the same purchase as the last batch] The cast peeled off the glass nicely Nov 4th, 2016 and finished drying over the weekend. Some materials were stuck on the WC jar wall and balls, consistent with every time. Initial UO2 powder used = 50.16g (Inventory R-01032A, UO2 + bottle = 1078.15g before use) Graphite powder used = 10.03g Green cast dried UO2/C + organic mass = 61.91g  The green was rolled up and wrapped in a piece of graphite sheet. The Ta-target boat was wrapped with 3-layers of heat shield and installed in evap1 today. Chamber is currently pumping down, IG1 = 2.4e-5 Torr. Target boat will be ramped up to 520A at the rate of 0.1A/min. Vacuum limit stop at 5.0e-5 Torr, backing off at 6.0e-5 Torr.  Tuesday, November 08, 2016, 07:43 IG1 = 2.4e-6 Torr Tapped up to 35A, 0.50V Waited ~50min, vacuum stable. IG1 = 1.3e-5 Torr Initiating auto-ramp

 Tuesday, November 15, 2016, 09:59

TGHT reached to 520A/5.12V; however the pressure was still remained high at the limit 5.0e-5 Torr which indicating that the carbonization process isn't complete yet.

Increase TGHT to 520A at a ramping rate of 0.1A/min.

Thursday, July 05, 2018, 13:24

Target container was previously coated and sintered with TaC, also wrapped with Ta heat shields (see Evap2 elog# 410).

Loaded 201 discs of UCx with 7.27 cm in length + 5 extra discs for QC samples. 

One end-cap (coated/sintered TaC) inserted right, wrt the ionizer tube pointing down.

Left side is OPEN; a spring is inserted to hold the discs in place.

Chamber is currently being pumped down. 

TGHT will be ramped up to 495A/8.85V and TBHT to 230A/3.26V (same parameters used for sintering the container, evap2 elog#410).

Vacuum initial setting:

Good Vac = 5.0 e-5 Torr, Bad vac = 8.0 e-5 Torr.

pressure level will be monitored accordingly...

Auto-ramping setting

TGHT: 60 wait time, 0.2A/min, final 495A

TGHT: 60 wait time, 0.2A/min, final 230A.

 Thursday, July 05, 2018, 16:50

Tapping up TGHT to 40 A/0.49 V and TGHT to 40A/0.64V.

Vac slowly increasing from 5.0 e-6 Torr. 

Initiate auto-heating

 Tuesday, July 10, 2018, 10:46

Holding TGHT at 495A/5.3V for over 25 hours.  Pressure at 2.9e-6 Torr.

Initiate autocooling TGHT at 2A/min, TBHT 1.0A/min

 Wednesday, July 11, 2018, 17:12

Target was removed from the Evap; it is now in the Ar glovebox.  End cap is inserted. 

Target is ready for installation.

Wednesday, July 11, 2018, 17:41

Cast prepared by Marla (see note in Hotlab)

Target boat contained about 50g UO2 powder. 

TGHT will be ramped up to 520A.

Vacuum limit stop at 3.0 e-4 Torr, backing off at 6.0e-4 Torr. 

Chamber is currently being pumped down

 Thursday, July 12, 2018, 10:45

Pressure at 8.9e-7 Torr. 

Initiate auto ramping TGHT at 0.1A/min to reach 580A (will monitor vacuum to ensure complete carbonization)

 Wednesday, July 18, 2018, 10:23

TGTH at 369A/3.7V, carbonization in progress. 

Pressure limited was set to 5.0e-5 Torr; change limit to 6e-4 Torr (as indicated above)

Increase ramping rate to 0.2A/min.

 Thursday, July 19, 2018, 12:12

Completion of the U-carbonization has been reached. 

Cooling down TGHT at 2A/min

Chamber will be vented in Ar and materials will be transferred to Ar glovebox

Friday, August 03, 2018, 17:44

Target consists of 230 UCx discs, total packing length of 7.1cm. 

Container was previously coated/sintered with TaC (see elog #415) in Evap#2 with TGHT set to 450A/7.5V and TBHT 230A/4.2

Vacuum initial setting:

Good Vac = 5.0 e-5 Torr, Bad vac = 8.0 e-5 Torr.

pressure level will be monitored accordingly...

Auto-ramping setting

TGHT: 60 wait time, 0.2A/min, final 450A

TGHT: 60 wait time, 0.2A/min, final 230A.

Chamber is currently being pumped down.Good

 Monday, August 06, 2018, 00:04

Pressure at 3.6e-6 Torr. 

Initiate autoramping.

 Friday, August 10, 2018, 11:02

TGHT/TBHT have been at 450A(4.5V)/230A(2.9) for over 15 hours.

Pressure is stabilized at 5.2e-6 Torr. 

Initiated auto-cooling at 2A/min for TGHT and 1A/min for TBHT.

Saturday, September 29, 2018, 18:52

Cast is from Jar#1.  (see process sheet for details)

Target boat contains about 50g UO2 powder. 

TGHT will be ramped up to 520A; fast tapping can be done, see elog#211, or set to autoramping with higher vacuum limit (1setup UCx process with pressure up to 60mTorr, see elog #210)

Chamber is currently being pumped down

 Saturday, September 29, 2018, 21:21

Pressure at 2.6e-5 Torr.

Tapping up TGHT in process

 Saturday, September 29, 2018, 21:32

Tapped to 80A/0.65V.  Wait for vacuum to stabilize.

 Saturday, September 29, 2018, 21:42

Pressure stabilized at 2.5mTorr.

Tapping up to 90A/0.701V

Saturday, September 29, 2018, 21:44

Pressure stabilized at 2.7m Torr; tapping up to 100A/0.77V

Saturday, September 29, 2018, 23:57

TGHT at 520A/4394V (see attachment for striptool capture).  Pressure at 163mTorr and coming down.

 Sunday, September 30, 2018, 12:56

At around midnight, pressure was coming down from 160 mTorr to 21 mTorr before TGHT tripped off (see attachment#2).

I suspect the TP was working too hard causing it to trip.

Pressure at 2.1e-6 Torr. 

Using auto-ramping.  Set good vac at 2.0e-4 Torr, bad vac at 5.0e-4 Torr.  Ramping TGHT at 2A/min to reah 520A.

 Sunday, September 30, 2018, 17:11

Pressure limiting at 0.2 mTorr as TGHT slowly ramping up, currently at 442A;  (see attachment#3).

 Monday, October 01, 2018, 21:15

TGHT was held at 520A for at least a day.  Vac at 3.7e-6 Torr.  Ramping down TGHT at 2A/min.

Marla Cervantes wrote:

Monday, September 03, 2018, 10:17 Graphite insert fully loaded with UCx was loaded into previously TaC coated target container. No end caps on Ta target container. Weight of graphite tube + UCx discs = 27.118 g Currently pumping down in evap1. Tuesday, September 04, 2018, 10:17  IGP1 = 4.02e-6 Torr Tapped up TBHT and TGHT manually to 100 A @1 A/s with pauses of 20 s. Wait for 40 min to pressure to stabilize. Max pressure 1.38e-4 Torr. Final pressure 5.93e-5 Torr. Tuesday, September 04, 2018, 11:46  Good vacuum 5e-1 Torr Bad vacuum 8e-1 Torr Initiating auto ramp for TGHT @ 10 A/min to a max setpoint of 520 A Initiating auto ramp for TBHT @ 5 A/min to a max setpoint of 245 A  Tuesday, September 04, 2018, 12:54  After achieving 520 A with auto ramp, manually tapped to 599 A. Manually tapped back to 550 A.

 Saturday, September 29, 2018, 20:52

Target is taken out from the chamber and transferred to the Ar glove box.

Thursday, October 11, 2018, 18:06

Target consists of 284 UCx discs, total packing length of 8.0 cm. 

Container was previously coated/sintered with TaC (see elog #417) in Evap#2 with TGHT set to 400A and TBHT 230A, but there was a problem with the readback.  Will ramp up TGHT to 400A to see if the carbonization is complete; if not, additional 50A on TGHT can be applied.

One end-cap is inserted on the right, wrt to the ionizer, and left end is open. 

Vacuum initial setting:

Good Vac = 5.0 e-5 Torr, Bad vac = 8.0 e-5 Torr.

pressure level will be monitored accordingly...

Auto-ramping setting

TGHT: 60 wait time, 0.2A/min, final 400A (or addtional of 50 A if required as mentioned above)

TGHT: 60 wait time, 0.2A/min, final 230A.

 Chamber is currently being pumped down.

 Friday, October 12, 2018, 15:35

Chamber has pumped down to 1.8e-6 Torr. 

Stepping up TGHT and TBHT to 40A.

 Friday, October 12, 2018, 17:07

TGHT/TBTH was held at 40A reaching max pressure of 1.7e-5 before slowly coming down. 

Initiated autoramping.

 Thursday, October 18, 2018, 11:10

TGHT reached to 400A/3.98V, pressure is coming down from the upper limit at around 320A which indicated the carbonization is approaching to completion (see attachment#1).  However, two more out-gassing steps are typically observed as TGHT reached around 450 A (see previous UCx conditioning process).  Currently the pressure is at 1.04 e-5 torr. 

Auto-ramping TGHT to 450A at 1A/min, continue to observe the vacuum...

 Thursday, October 18, 2018, 12:57

TGHT reached to 450A/4.6V. Pressure is coming down from 1.6 e-5 Torr. (see attachment#2).  Will remain at this heating current until pressure reached to mid 10-6 torr.

 Tuesday, May 26, 2019, 18:20

A loaded graphite cartridge was set in a tantalum boated and wrapped with 3 tantalum sheets (Friday May 22, 2020)

The set up was installed in the EVAP1 and pumped down during the weekend.

IGP1 = 7.10 e-7 Torr

Good vacuum = 1e-1 Torr

Bad vacuum = 5e-1 Torr

Current ramp is 1A per 10s from 0A to 120A

Wednesday, June 03, 2020, 08:11 

A loaded graphite cartridge was set in a tantalum boated and wrapped with 3 tantalum sheets (Friday May 29, 2020)

The set up was installed in the EVAP1 then IEVAP:IGP1 was replaced (elogs 260 and 261).  

Vacuum was turned on after Ion Gauge swap.

IGP1 = 3.6 e-5 Torr

Good vacuum = 5e-2 Torr

Bad vacuum = 5e-1 Torr

Current ramp is 1A per 10s from 0A to 120A

Wednesday, June 03, 2020, 09:59 

After about 20 minutes at 120 A, TGHT tripped again exactly as before.

Will restart ramp at 1A per 10s from 0A to 120A .  Will set good vacuum to 1e-2 Torr

IGP1= 4.3e-05 Torr

Wednesday, June 03, 2020, 10:57

IGP1 =  9e-4 Torr

Pressure peaked around 4e-3 Torr and now trending down

TGHT =120 A

Wednesday, June 03, 2020, 11:23

IGP1=9.5e-5 Torr

Good Vacuum 1e-02 Torr

Bad Vacuum 5e-1 Torr

Starting TGHT ramp to 550 A at 3A per 10s  

Wednesday, June 03, 2020, 14:41

ramp up was good.  TGHT at 550 A since 12:30 pm.  TGHT did not trip. *note adjusted good vacuum.  Ramping takes a little longer but doesn't trigger TGHT shutdown.

Wednesday, June 03, 2020, 22:55

IGP1 =  3.5e-5 Torr

TGHT = 249.4 A, 5.7 V

Start ramp down at -2A per minute to 0 A

Target #34 was installed in the EVAP1 and pumped down (Tuesday June 29, 2021).

Target #34 is going to be conditioned on a Ta boat wrapped with 3 Ta foils.

IGP1 = 1.85e-6 Torr

Good vacuum = 1e-1 Torr

Bad vacuum = 5e-1 Torr

Power desired 1.6kW. This is the second target conditioned this way. 

Subsequent targets should be conditioned following thermal reduction.

 Thursday, July 01, 2021, 06:05

IGP1= 1.35e-06 Torr

Start autoramp @2A/30s to 400A

Thursday, July 01, 2021, 07:59

Pressure increase was observed near 400A 

will ramp to 450A and  keep for 8 hours

IGP1= 1.4 e-05 Torr

450A and 4.0V reached at 8:14 am on Thursday July 01, 2021

Rampdown @-2A/min was started at 4.14 pm on Thursday July 01, 2021 IGP1 stable at 2.7e-06Torr

Cannot transfer into glovebox yet because moisture is a bit high after regeneration.  Moisture is dropping. Will wait until moisture is sufficiently low.

Monday, July 05, 2021, 20:43

Cartridge was removed and placed in bag inside glovebox

Removed 10 discs for analysis but might place them back inside depending on final decision.  We had previously removed 10 discs after thermal reduction.

 Wednesday, July 07, 2021, 14:39

Target Provisional ID = 200929 was installed in the EVAP1 and pumped down (Tuesday July 7, 2021).

Target is going to be thermally reduced for 8 hours and then conditioned for an additional 8 hours

IGP1 = 2.0 e-6 Torr

Good vacuum = 1e-1 Torr

Bad vacuum = 5e-1 Torr

Power desired 1.6kW.

10 extra discs included for analysis

Wednesday, July 07, 2021, 14:49 

Ramping up TGHT at 6A/min [wait interval = 10 s at increments of 1A]

Wednesday, July 07, 2021, 15:58

IGP1= 5.7 e-5 Torr and trending down.  Will start ramp up to 450A at  18A/min [wait interval 10s at 3A increments]

Wednesday, July 07, 2021, 16:20 

IGP1= 2.2e-3 Torr

Will continue ramping TGHT to 500A and watch pressure

Wednesday, July 07, 2021, 16:26

Continue ramping to 550 at 3A/10s

 Wednesday, July 07, 2021, 16:29

holding at 550A, 5.1V for 8 hours 

Wednesday, July 07, 2021, 23:41 

TGHT = 550A, 5.7 V

begin ramp down at -2A/min to 450A and leave for 8 hours

Thursday, July 08, 2021, 08:20

 IGP1= 2.7 e-06 Torr

TGHT = 450A, 4.5V

Will start ramp down at -2A/min to 0A 

 Thursday, September 23, 2021, 06:55

A loaded graphite cartridge was set in a tantalum boated and wrapped with 3 tantalum sheets (Wednesday September 22)

IGP1 = 3.6 e-5 Torr

Good vacuum = 5e-2 Torr

Bad vacuum = 5e-1 Torr

Current ramp is 2A per min from 0A to 120A and 1A/10s from 120A to (450-550A)

Thursday, September 23, 2021, 07:09 

IGP1 = 1.84 e-06 Torr

Start Autoramp to 120A @ 2A/min 

Thursday, September 23, 2021, 10:25

Start Autoramp to 550A @ 1A/10s

 IGP1= 1.05e-05 Torr

TGHT= 120 A, 1.06 V

Thursday, September 23, 2021, 11:57 

Pressure drop observed at 530A.  Start 4 hour count.  

Thursday, September 23, 2021, 15:57 

IGP1= 9.1e-06 Torr

After 4 hour reduction started rampdown to 400A at 2A/30s.

8 hour conditioning to start at 16:15 pm

Friday, September 24, 2021, 00:16

TGHT= 399.8 A, 3.5V

IGP1= 2.4 e-06 Torr 

Start ramp down at 2A/min

Wednesday, June 01, 2022, 08:39

A loaded graphite cartridge was set in a tantalum boated and wrapped with 3 tantalum sheets (previous day)

IGP1 = 1.6 e-6 Torr

Good vacuum = 5e-2 Torr

Bad vacuum = 5e-1 Torr

Current ramp is 1A per 10s from 0A to 40A then continue to 80A at 1A/10s.  Then at 1A/min to 120 A and allow degas and then autoramp 1A/10s from 120A to (450-550A)

Wednesday, June 01, 2022, 09:51

IGP1= 3.0e-4 Torr

TGHT = 120A, 1.0V

Start autoramp at 1A/10s to 420A

Wednesday, June 01, 2022, 10:02

Increased ramp rate to 3A/10 s as per SOP to 440 A then will slow down the ramp to observe pressure behavior.

Wednesday, June 01, 2022, 10:19

At 430 A, autoramp set to 1A/10s to 500A as pressure was increasing. 

Will observe behavior of pressure curve then leave for 4 hours

Wednesday, June 01, 2022, 11:04

Pressure started dropping at 520A.  Stopped ramping and will leave for 4 hours.

Wednesday, June 01, 2022, 14:48

Autoramp to 400 A at 2A/30s and leave for 8 hour treatment

Wednesday, June 01, 2022, 23:00

IGP1= 2.1e-6 Torr

TGHT= 400A

Ramping down @-2A/min to 0A

Thursday, June 02, 2022, 10:09

IGP1= 6.7e-7 Torr

Ready to dismount