Friday, May 18, 2018, 18:32

35 circles of 14 mm diameter of cast #3 were packed into a graphite sample container.

40 x UO2/C circles = 4.58 g

Graphite container mass = 6.95 g

Graphite tube is placed inside a target boat.

Boat previously coated with TaC and sintered.

Ta-target boat is wrapped with 3 used Ta foils for heat shielding and the boat was installed in Evap1.

Chamber currently pumping down.

Saturday, May 19, 2018, 07:30 

Initial IGP1 = 6.27e-7 Torr

 Tapped to 80A at 10A/10s with 20 s waiting period each 10 A

 Waited 4 min for vacuum to stabilize.

 Tapped to 100 A at 10A/10s with 20 s waiting period each 10 A

 Waited 12 min for vacuum

Tapped to 400 A at 25A/30s with 30 s waiting period each 25 A

Tapped to 520 A at 20A/30s with 30 s waiting period each 20 A

Pressure dropping indicates carbonization complete.

Current tripped off, vacuum was ok, water cooling was ok.

Saturday, May 19, 2018, 10:00 

Current was returned to 520 A manually

Tapped to 100 A at 10A/10s with 20 s waiting period each 10 A 

Tapped to 400 A at 25A/30s with 30 s waiting period each 25 A

Tapped to 520 A at 20A/30s with 30 s waiting period each 20 A

The discs will stay at max current for 4 hrs

 Saturday, May 19, 2018, 18:31

Vented with Argon and removed form evaporator 1

Friday, May 25, 2018, 15:34 

D-shaped discs were cut from cast 3

A 13mm punch was used to punch out discs from pre-cut strips using the old method.

The target consists of 205 discs with 10 cm in length - all single discs, no packs.

205 x UO₂/C discs = 22.04 g

Graphite insert with caps is placed inside a target boat.

Boat previously coated with TaC and sintered.

Ta-target boat is wrapped with 3-layers of heat shield and installed in evap1.

Chamber is pumping down.

 Saturday, May 26, 2018, 10:39

Current tapped manually to 80 A at 1A/s in 10 A blocks with a waiting period of 20 s between each increment

18 min waiting for pressure stabilization

Current tapped to 100 A in same rate

Saturday, May 26, 2018, 10:51 

After 9 min current was reduced to 60 A to reduce pressure.

Cuerrent was tapped to 100 A

After 10 min the rate was increased to 25 A each 20 s until 450 A

The rate was changed to 10 A each 2 min until 500 A

Last 20 A were tapped after 1 min 

Saturday, May 26, 2018, 15:41 

After 4hrs the current was reduced in a rate of 10 A /min

Monday, May 28, 2018, 12:45 

EVAPI was vented with Ar and UCx was transferred to glove box.

 Tuesday, June 12, 2018, 18:20

35 circles of 14 mm diameter of cast #4 were packed into a graphite sample container.

30 x UO₂/C circles = 4.07 g

Graphite container mass = 5.3 g

Graphite tube is placed inside a target boat.

Boat previously coated with TaC and sintered.

Ta-target boat is wrapped with 3 used Ta foils for heat shielding and the boat was installed in Evap1.

Chamber currently pumping down.

Wednesday, June 13, 2018, 10:29 

Initial IGP1 = 6.43e-7 Torr

Tapped to 80A at 10A/10s with 20 s waiting period each 10 A

Waited 5 min for vacuum to stabilize.

Tapped to 90 A at 10A/10s with 20 s waiting period each 10 A

Waited 5 min to tap to 100 A 

Waited 14 min for vacuum to stabilize

Tapped to 400 A at 25A/30s with 30 s waiting period each 25 A

Tapped to 520 A at 20A/30s with 30 s waiting period each 20 A

Max pressure ~0.06 Torr 

Marla Cervantes wrote:

Tuesday, June 12, 2018, 18:20 35 circles of 14 mm diameter of cast #4 were packed into a graphite sample container. 30 x UO2/C circles = 4.07 g Graphite container mass = 5.3 g Graphite tube is placed inside a target boat. Boat previously coated with TaC and sintered. Ta-target boat is wrapped with 3 used Ta foils for heat shielding and the boat was installed in Evap1. Chamber currently pumping down. Wednesday, June 13, 2018, 10:29  Initial IGP1 = 6.43e-7 Torr Tapped to 80A at 10A/10s with 20 s waiting period each 10 A Waited 5 min for vacuum to stabilize. Tapped to 90 A at 10A/10s with 20 s waiting period each 10 A Waited 5 min to tap to 100 A  Waited 14 min for vacuum to stabilize Tapped to 400 A at 25A/30s with 30 s waiting period each 25 A Tapped to 520 A at 20A/30s with 30 s waiting period each 20 A Max pressure ~0.06 Torr

 Wednesday, June 13, 2018, 11:08

Pressure was dropping indicating full carbothermal reduction but the current tripped off to 0 A.

Marla Cervantes wrote:

Marla Cervantes wrote:  Tuesday, June 12, 2018, 18:20 35 circles of 14 mm diameter of cast #4 were packed into a graphite sample container. 30 x UO2/C circles = 4.07 g Graphite container mass = 5.3 g Graphite tube is placed inside a target boat. Boat previously coated with TaC and sintered. Ta-target boat is wrapped with 3 used Ta foils for heat shielding and the boat was installed in Evap1. Chamber currently pumping down. Wednesday, June 13, 2018, 10:29  Initial IGP1 = 6.43e-7 Torr Tapped to 80A at 10A/10s with 20 s waiting period each 10 A Waited 5 min for vacuum to stabilize. Tapped to 90 A at 10A/10s with 20 s waiting period each 10 A Waited 5 min to tap to 100 A  Waited 14 min for vacuum to stabilize Tapped to 400 A at 25A/30s with 30 s waiting period each 25 A Tapped to 520 A at 20A/30s with 30 s waiting period each 20 A Max pressure ~0.06 Torr   Wednesday, June 13, 2018, 11:08 Pressure was dropping indicating full carbothermal reduction but the current tripped off to 0 A.

 Wednesday, June 13, 2018, 12:23

The problem was reported to controls group

After 1 hour at 0 A, the autoramp was set to 4 A/min up to 520 A

The current and voltage are increasing accordingly.

The material will stay 4 hours at max point.

Thursday, June 14, 2018, 09:14 

After 4 hours the auto ramp was set to -1A/min to 0 A

Thursday, June 14, 2018, 14:47 

The IEVAP  was vented with Ar and the UCx was trasnferred to the glove box.

 Friday, June 15, 2018, 16:39

35 circles of 14 mm diameter of cast #3 were packed into a graphite sample container.

35 x UO₂/C circles = 4.07 g

Graphite container mass = 5.3 g

Graphite tube is placed inside a target boat.

Boat previously coated with TaC and sintered.

Ta-target boat is wrapped with 3 used Ta foils for heat shielding and the boat was installed in Evap1.

Chamber currently pumping down.

 Saturday, June 16, 2018, 15:00

Tapped to 80A at 10A/10s with 20 s waiting period each 10 A

Waited 5 min for vacuum to stabilize.

Tapped to 90 A at 10A/10s with 20 s waiting period each 10 A

Waited 14 min for vacuum to stabilize

Tapped to 100 A at 10A/10s with 20 s waiting period each 10 A

Tapped to 520 A at 20A/20s with 20 s waiting period each 20 A

 Tuesday, June 19, 2018, 15:51 

 The material will be in the evap for a week

Wednesday, June 27, 2018, 09:53 

 The IEVAP  was vented with Ar and the UCx was trasnferred to the glove box.

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

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.

Monday, October 22, 2018, 17:55 

UO2/C green was prepared , September 24, 2018

Initial UO2 powder used = 50.11 g (Inventory R-01032A, UO2 + bottle = 374.03 g before use)

Graphite powder used = 10.13 g

Green cast dried UO2/C + organic mass = 62.45 g 

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 [2 reused, 1 new] and installed in evap1.

Currently pumping down.

 Tuesday, October 23, 2018, 15:38

IGP1 = 2.44e-6 Torr,

Tapped to 60 A at 10A/10s with 20 s waiting every 10 A,

Waited 28 min to vacuum to stabilize,

tapped to 80 A at 10A/10s with 20 s waiting every 10 A,

max pressure 7x10-3 Torr, waited 50 min to vacuum to drop

Tapped to 100 A at 10A/10s with 20 s waiting every 10 A,

max pressure 4x10-2 Torr, tapped current to 80 A,

The pressure was dropping, when it was at 2x10-2 Torr, the current tripped off.

IGP1 = 1x10-4 Torr

Tapped back to 60 A at 10A/10s with 20 s waiting every 10 A,

waited 5 min to tap to 80 A at same rate

waited 5 min to tap to 100 A at same rate

waited 25 min to vacuum to drop from 2e-2 Torr to 8e-4Torr

Tapped to 110 A at same rate

Marla Cervantes wrote:

Monday, October 22, 2018, 17:55  UO2/C green was prepared , September 24, 2018 Initial UO2 powder used = 50.11 g (Inventory R-01032A, UO2 + bottle = 374.03 g before use) Graphite powder used = 10.13 g Green cast dried UO2/C + organic mass = 62.45 g  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 [2 reused, 1 new] and installed in evap1. Currently pumping down  Tuesday, October 23, 2018, 15:38 IGP1 = 2.44e-6 Torr, Tapped to 60 A at 10A/10s with 20 s waiting every 10 A, Waited 28 min to vacuum to stabilize, tapped to 80 A at 10A/10s with 20 s waiting every 10 A, max pressure 7x10-3 Torr, waited 50 min to vacuum to drop Tapped to 100 A at 10A/10s with 20 s waiting every 10 A, max pressure 4x10-2 Torr, tapped current to 80 A, The pressure was dropping, when it was at 2x10-2 Torr, the current tripped off. IGP1 = 1x10-4 Torr Tapped back to 60 A at 10A/10s with 20 s waiting every 10 A, waited 5 min to tap to 80 A at same rate waited 5 min to tap to 100 A at same rate waited 25 min to vacuum to drop from 2e-2 Torr to 8e-4Torr Tapped to 110 A at same rate waited 3 min  to tap to 120 A at same rate waited 1 min  to tap to 130 A at same rate waited 1 min  to tap to 140 A at same rate   waited 15 min to pressure to drop from 6e-2 Torr to 7e-4 Torr   Changing manual rate to 10A/10s with waiting periods of 1 min, current was increased from 140 A to 260 A with this rate.   Changing manual rate to 20A/10s with waiting periods of 30 s, current was increased from 260 A to 480 A with this rate.   Waiting 4 min for the pressure to increase.   Changing the rate to 5A/30s, tapped until 510 A,   Changing the waiting period to 1 min, kept tapping to 530 A,   The pressure was dropping, when it was at 2x10-2 Torr, the current tripped off   The vacuum limit is 5e-1 Torr, and the pressure was dropping, there was no reason for the current to trip.   The pumps seems to be fine in the hot lab.

 Wednesday, October 24, 2018, 17:51

Rod from controls checked on the system, seems that the controls are not the cause of the trip

Rod suggested that the power supply might be overheating, 

thermocouples were installed on the surface of the power supply to register the temperature during the process

Tapping the current up again at accelerated rate see spread sheet for details.

Since pressure was not decreasing the current was increased to 595 A (rate 1A/min) [see figure CT-2]

The power supply's maximum temperature was 32.7 C which is a difference of 9.7 degrees with respect to the initial temperature. 

The target will remain at maximum temperature overnight.

Marla Cervantes wrote:

Marla Cervantes wrote: Monday, October 22, 2018, 17:55  UO2/C green was prepared , September 24, 2018 Initial UO2 powder used = 50.11 g (Inventory R-01032A, UO2 + bottle = 374.03 g before use) Graphite powder used = 10.13 g Green cast dried UO2/C + organic mass = 62.45 g  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 [2 reused, 1 new] and installed in evap1. Currently pumping down.  Tuesday, October 23, 2018, 15:38 IGP1 = 2.44e-6 Torr, Tapped to 60 A at 10A/10s with 20 s waiting every 10 A, Waited 28 min to vacuum to stabilize, tapped to 80 A at 10A/10s with 20 s waiting every 10 A, max pressure 7x10-3 Torr, waited 50 min to vacuum to drop Tapped to 100 A at 10A/10s with 20 s waiting every 10 A, max pressure 4x10-2 Torr, tapped current to 80 A, The pressure was dropping, when it was at 2x10-2 Torr, the current tripped off. IGP1 = 1x10-4 Torr Tapped back to 60 A at 10A/10s with 20 s waiting every 10 A, waited 5 min to tap to 80 A at same rate waited 5 min to tap to 100 A at same rate waited 25 min to vacuum to drop from 2e-2 Torr to 8e-4Torr Tapped to 110 A at same rate waited 3 min  to tap to 120 A at same rate waited 1 min  to tap to 130 A at same rate waited 1 min  to tap to 140 A at same rate   waited 15 min to pressure to drop from 6e-2 Torr to 7e-4 Torr   Changing manual rate to 10A/10s with waiting periods of 1 min, current was increased from 140 A to 260 A with this rate.   Changing manual rate to 20A/10s with waiting periods of 30 s, current was increased from 260 A to 480 A with this rate.   Waiting 4 min for the pressure to increase.   Changing the rate to 5A/30s, tapped until 510 A,   Changing the waiting period to 1 min, kept tapping to 530 A,   The pressure was dropping, when it was at 2x10-2 Torr, the current tripped off   The vacuum limit is 5e-1 Torr, and the pressure was dropping, there was no reason for the current to trip.   The pumps seems to be fine in the hot lab.  Wednesday, October 24, 2018, 17:51 Rod from controls checked on the system, seems that the controls are not the cause of the trip Rod suggested that the power supply might be overheating,  thermocouples were installed on the surface of the power supply to register the temperature during the process Tapping the current up again at accelerated rate see spread sheet for details. Since pressure was not decreasing the current was increased to 595 A (rate 1A/min) [see figure CT-2] The power supply's maximum temperature was 32.7 C which is a difference of 9.7 degrees with respect to the initial temperature.  The target will remain at maximum temperature overnight.

 Thursday, October 25, 2018, 09:07

Carbothermal reduction completed

IGP1 =  1.22e-5 Torr

Maximum power supply's temperature 33.3 C

Ramping current down at 2 A/min.

Monday, October 29, 2018, 12:30

Transferring  UCx to glove box

Mass = 48.384 g

 Thursday, November 22, 2018, 17:25

D-shaped discs were cut from cast #26

A 13mm punch was used to punch out discs from pre-cut strips

The target consists of 236 discs of 10 cm in length - all single discs, no packs.

236 x UO₂/C discs = 22.66 g

Graphite insert with caps = 11.74 g

The loaded inser is placed on target boat.

Boat previously coated with TaC and sintered.

Ta-target boat is wrapped with 3-layers (2 new one used) of heat shield and installed in evap1.

Chamber is pumping down.

 Friday, November 23, 2018, 08:53

Vacuum limits:

Good vacuum 1e-1 Torr

Bad vacuum 5e-1 Torr

IGP1 = 4.12 e-6 Torr

Current tapped manually to 100 A at 1A/s in 10 A blocks with a waiting period of 20 s between each increment.

Initial IGP1 = 5.31 e-6 Torr

Max  IGP1 = 0.066 Torr

Waited 20 min for pressure to rise and drop.

The current tripped off, when the 0.013 torr  (Fig. Nov23-CurrentTrip1).

Increasing the current to 100 A again.

IGP1 = 7.00e-5 Torr

Rate was increased to 25 A each 20 s until 200 A

The pressure increased and IV1 opened, current was dropped to 100 A

Pressure after 5 min 4e-4 Torr

Rate was increased again to 25 A each 20 s until 200 A

The current was reduced to 110 A because the pressure was rising to fast

Rate was increased again to 25 A each 20 s until 300 A

The automatic ramp was set to 20 A/ min from 0 to 300 A

The automatic ramp was changed to 10A/2min to 450 A

IGP1 = 2.15e-5 Torr

After 1.5 hour, the automatic ramp was set to 20 A/ min from 450 to 500 A

After 4hrs, the automatic ramp was set to -2 A/ min from 500 to 0 A

Marla Cervantes wrote:

Thursday, November 22, 2018, 17:25 D-shaped discs were cut from cast #26 A 13mm punch was used to punch out discs from pre-cut strips The target consists of 236 discs of 10 cm in length - all single discs, no packs. 236 x UO2/C discs = 22.66 g Graphite insert with caps = 11.74 g The loaded inser is placed on target boat. Boat previously coated with TaC and sintered. Ta-target boat is wrapped with 3-layers (2 new one used) of heat shield and installed in evap1. Chamber is pumping down.  Friday, November 23, 2018, 08:53 Vacuum limits: Good vacuum 1e-1 Torr Bad vacuum 5e-1 Torr IGP1 = 4.12 e-6 Torr Current tapped manually to 100 A at 1A/s in 10 A blocks with a waiting period of 20 s between each increment.   Initial IGP1 = 5.31 e-6 Torr Max  IGP1 = 0.066 Torr Waited 20 min for pressure to rise and drop. The current tripped off, when the 0.013 torr. Increasing the current to 100 A again. IGP1 = 7.00e-5 Torr Rate was increased to 25 A each 20 s until 200 A The pressure increased and IV1 opened, current was dropped to 100 A Pressure after 5 min 4e-4 Torr Rate was increased again to 25 A each 20 s until 200 A The current was reduced to 110 A because the pressure was rising to fast Rate was increased again to 25 A each 20 s until 300 A Pressure was ok and current tripeed off The automatic ramp was set to 20 A/ min from 0 to 300 A The automatic ramp was changed to 10A/2min to 450 A IGP1 = 2.15e-5 Torr After 1.5 hour, the automatic ramp was set to 20 A/ min from 450 to 500 A After 4hrs, the automatic ramp was set to -2 A/ min from 500 to 0 A

 Monday, November 26, 2018, 17:00

 The UCx was transferred to the glove box and loaded in  tantalum container  42218-3.

Friday, June 14, 2019, 17:10

A 14 mm die was used to cut out discs from strips

The target consists of 236 discs of 10 cm in length - all single discs, no packs.

231 x UO₂/C discs = 25.76 g

12 UO₂ discs for measurements = 1.49 g

Graphite insert without caps= 11.59 g

The loaded insert is placed on target boat.

Boat previously coated with TaC and sintered.

Ta-target boat is wrapped with 3-layers (2 new one used) of heat shield and installed in evap1.

Chamber is pumping down.

Monday, June 17, 2019, 08:56 

Pressure limits:

Good vacuum 1e-1 Torr

Bad vacuum 5e-1 Torr

IGP1 = 6.600777e-7 Torr

Current tapped manually to 80 A at 1A/s in 10 A blocks with a waiting period of 20 s between each increment.

Initial IGP1 = 5.31 e-6 Torr

Monday, June 17, 2019, 10:03

After 42 minutes the pressure started dropping and the current rate was changed to 1A/s with for 20 second intervals followed by 20 second wait while monitoring pressure.

Monday, June 17, 2019, 14:41

Current was tapped to 100A but the pressure increased too rapidly; therefore, the current was tapped down to 75A.

After pressure stabilized, the current was tapped up to 100 A @1A/s in 20A segments and 20 second pauses.

Continued tapping up at the above rate until 160A, at which point the pressure shot up and tripped the system.

The pressure stabilized within 18 minutes.

The wait interval on the heater ramps control was changed to 1s

The current increment was set to 0.2A with a final value of 200A

At 170A the autoramp was stopped and the current manually tapped down to 160A to prevent rapid pressure buildup.

5 minutes later the pressure had stabilized and autramp was restarted.

At 160A we changed the waiting interval to 10s and the current increment to 2A.

At 200A we stopped autoramp and manually tapped at 1A/s in 20A segments with 10s pauses. 

At 360A, we changed the current increment to 1A while keeping the wait interval at 10s.

At 440A the autoramp was stopped to change the current increment to 0.5A while the waiting interval was kept at 10s.

The autoramp final current was set to 500A.

At 495A the autoramp was stopped because the pressure was dropping significantly.

The Target was left for 3 hours at 495A.

Pre-cooling conditions:

TGHT = 494A, 4.8V

IGP1 = 6.7e-6 Torr

Cooling rate = -2A/min

Friday, June 26, 2019, 17:10

A 13 mm die was used to cut out discs from strips

The target consists of 264 discs of 10 cm in length - all single discs, no packs.

231 x UO₂/C discs = 25.76 g

10 UO₂ discs for measurements = 1.49 g

Graphite insert without caps= 17.44 g

The loaded insert is placed on target boat.

Boat previously coated with TaC and sintered.

Ta-target boat is wrapped with 3-layers (3 used) of heat shield and installed in evap1.

Chamber is pumping down. 

Tuesday, July 30, 2019, 09:45

Pressure limits:

Good vacuum 1e-1 Torr

Bad vacuum 5e-1 Torr

Initial vacuum IGP1 = 5.94e-7 Torr

Current tapped manually to 85 A at 1A/s in 5 A blocks with a waiting period of 25 s between each increment. 

Tuesday, July 30, 2019, 10:53

After 30 min, the pressure started stabilizing around 0.0013 g

The current rate was changed to 1 A/2min to 88 A

The current rate was changed to 1 A/min to 90 A

The current rate was changed to 1 A/30s to 100 A

The final pressure obtained was 0.0011 Torr

The current rate was changed to 2 A each 10 s to 170 A

The final pressure obtained was 0.04 Torr

The current rate was changed to 1 A each 10 s to 180 A

The final pressure obtained was 0.008 Torr

The final pressure was 0.001 Torr

The current was tapped manually to 400 A in intervals of 10 A at 1 A/s each 10 s

The autoramp was set to 1 A each 10 s to 450 A

Then the current was increased manually at 1 a each 20 s until 475 A

The current was increased in this manner until 480 A to make sure the pressure was not rising 

Tuesday, July 30, 2019, 12:00

After the pressure stabilized and started reducing the current was reduced to 480 A

After 3 hours at 475 A the autoramp was set to -2A/min

 Wednesday, October 02, 2019, 11:09

A graphite cartridge loaded with UO2/C foils, wrapped with three Ta heat shields was placed in the EVAP1.

The EVAP1 is currently pumping down.

 Thursday, October 03, 2019, 09:40

Pressure limits:

Good vacuum 1e-1 Torr

Bad vacuum 5e-1 Torr

Initial vacuum IGP1 = 9.54e-7 Torr

Current tapped manually to 80 A at 1A/s in 5 A blocks with a waiting period of 25 s between each increment. 

Thursday, October 03, 2019, 10:36

The pressure started decreasing after 45 min and the auto ramp was set to 1 A each 30 s to 86 A 

The autoramp was set to 2 A each 10 s to 180 A

The autoramp was set to 3.2 A each 10 s to 300 A

The autoramp was re start at 3.2 A each 10 s to 400 A 

The autoramp was set to 1 A each 10 s to 430 A 

The autoramp was set to 2 A each 10 s to 450 A 

The autoramp was set to 2 A each 10 s to 480 A 

Autoramp at 2 A per min to 500 A

Manually tapped to 545 A.

After 48 hrs at maximum temperature, the target was cooled done at -2 A/min 

Monday, October 28, 2019, 10:29

A loaded graphite cartridge was set in a tantalum boated and wrapped with 3 tantalum sheets

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

IGP1 = 1.10 e-6 Torr

Monday, October 28, 2019, 10:31

Good vacuum = 1e-1 Torr

Bad vaccum = 5e-1 Torr

The current ramp is 1 A each 10 s from 0 A to 100 A

Monday, October 28, 2019, 11:13 

After 18 min the pressure started dropped.

Monday, October 28, 2019, 11:22 

When the pressure reduced to 5e-4 Torr the current ramp was changed to 3.3 A each 10 s to 480 A, the vacuum limits stayed the same.

Monday, October 28, 2019, 11:45

The limit was set to 500 A with same ramp

Monday, October 28, 2019, 11:48 

The ramp was changed to 1A/10s to 550 A

 Monday, October 28, 2019, 11:55

At 520 A the pressure reach 1e-1 Torr and the autoramp stopped

Monday, October 28, 2019, 13:39

the current was increased manually at aprox. 1A/30 s 

The current dropped suddenly even though the pressure was under the limits and the ramping was in the limits.

Autoramp was set to 3 A/ 10 s from to to 500 A

Then it was changed to 1 A  /30s from 500 to 506 A

Finally it was changed to 1 A/ 10 s from 506 to 520 A

Manually tapped to 530 A

Monday, October 28, 2019, 15:40

At 13:45 the current reached 530 A. 

Marla Cervantes wrote:

Monday, October 28, 2019, 10:29 A loaded graphite cartridge was set in a tantalum boated and wrapped with 3 tantalum sheets The set up was installed in the EVAP1 and pumped dwon during the weekend. IGP1 = 1.10 e-6 Torr Monday, October 28, 2019, 10:31 Good vacuum = 1e-1 Torr Bad vaccum = 5e-1 Torr The current ramp is 1 A each 10 s from 0 A to 100 A Monday, October 28, 2019, 11:13  After 18 min the pressure started dropped. Monday, October 28, 2019, 11:22  When the pressure reduced to 5e-4 Torr the current ramp was changed to 3.3 A each 10 s to 480 A, the vacuum limits stayed the same. Monday, October 28, 2019, 11:45 The limit was set to 500 A with same ramp Monday, October 28, 2019, 11:48  The ramp was changed to 1A/10s to 550 A  Monday, October 28, 2019, 11:55 At 520 A the pressure reach 1e-1 Torr and the autoramp stopped Monday, October 28, 2019, 13:39 the current was increased manually at aprox. 1A/30 s  The current dropped suddenly even though the pressure was under the limits and the ramping was in the limits. Autoramp was set to 3 A/ 10 s from to to 500 A Then it was changed to 1 A  /30s from 500 to 506 A Finally it was changed to 1 A/ 10 s from 506 to 520 A Manually tapped to 530 A Monday, October 28, 2019, 15:40 At 13:45 the current reached 530 A.

The final pressure was IGP1 = 3.3e-6 Torr 

After 18 hrs at maximum temperature the autoramp was set to -2 A/min to 0 A.

Wednesday, January 29 2020, 05:55  

A P2N container  with heat shields, and with a UO2/C loaded graphite container was installed in the EVAP1

Chamber is currently being evacuated.

Thursday, January 30, 2020, 08:56

Pressure limits:

Good vacuum 1e-1 Torr

Bad vacuum 5e-1 Torr

Initial pressure: 

IGP1=1.52e-6Torr

Current ramp set to 1A/min to 10 A, voltage is stable.

Current ramp increased to 1A/10s to 100 A. The pressure started raising around 80 A.

Current was kept 5min at at 100 A, voltage was stable

Thursday, January 30, 2020, 09:32 

Current ramp set to 1A/20s to 150 A (same pressure limits)

Pressure keep increasing during heating

Thursday, January 30, 2020, 09:53 

Current was kept at 150 min during 5 min, the voltage is stable, pressure started to stabilize:

IGP1 = 0.027 Torr

TGHT = 0.418 V

Ramp set to 1A/min to 200 A.

Thursday, January 30, 2020, 10:02

Pressure decreasing:

TGHT= 153 A 

Marla Cervantes wrote:

Wednesday, January 29 2020, 05:55   A P2N container  with heat shields, and with a UO2/C loaded graphite container was installed in the EVAP1 Chamber is currently being evacuated. Thursday, January 30, 2020, 08:56 Pressure limits: Good vacuum 1e-1 Torr Bad vacuum 5e-1 Torr Initial pressure:  IGP1=1.52e-6Torr Current ramp set to 1A/min to 10 A, voltage is stable. Current ramp increased to 1A/10s to 100 A. The pressure started raising around 80 A. Current was kept 5min at at 100 A, voltage was stable Thursday, January 30, 2020, 09:32  Current ramp set to 1A/20s to 150 A (same pressure limits) Pressure keep increasing during heating Thursday, January 30, 2020, 09:53  Current was kept at 150 min during 5 min, the voltage is stable, pressure started to stabilize: IGP1 = 0.027 Torr TGHT = 0.418 V Ramp set to 1A/min to 200 A. Thursday, January 30, 2020, 10:02 Pressure decreasing: TGHT= 153 A

 Thursday, January 30, 2020, 10:15

At 155 A while pressure decreasing, the power supply tripped off,

Controls has been notified, waiting for instructions.