Marla Cervantes wrote:

Marla Cervantes wrote: Marla Cervantes wrote: Marla Cervantes wrote: 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.    Thursday, January 30, 2020, 11:51 Controls respond "It looks like the power supplies were tripped by either the pirani gauge (IEVAP:IGP1) or the Nuclear vent or by both. But, it did not look like that the interlock tree latched the bad condition when the power supplies tripped. I modified the PLC to properly latch the cause of the trip." and gave green light to restart the carbothermal reduction.  Thursday, January 30, 2020, 13:09 IGP1=5.9e-6Torr Ramp set to 1A/10s to 200 A Pressure rising too fast at 200 A, current reduced manually to 190 A Pressure start dropping and system tripped, notify to controls again, "The strip tool shows the vacuum level shoot down to 0 then shoot back up for a quick second but that is enough to tell the PLC that IGP is “bad”" Thursday, January 30, 2020, 15:58  Restarting process to try to trip the system on purpose  Initial pressure IGP1 = 2.7e-6Torr Ramp set to 1/A/10s to 200 A, 0.59 V Ramp set to 2A/10s to 300 A Max pressure during process IGP1 = 0.03 Torr Voltage increased and stabilized (see voltage rising). Ramp kept at 2A/10s to 400 A Thursday, January 30, 2020, 16:48  TGHT = 1.54 V, 399.744 A IGP1 = 0.00016 Torr and going down Ramp set to 2A/10s to 500 A Thursday, January 30, 2020, 17:02  TGHT= 1.9V, 499.2 A IGP1 = 0.00014 Torr Ramp set to 2A/10s to 600 A Ramp set to 0.5 A/min to 700 A, ramp stopped at 680 A Manually tapped to 697 A Pressure dropping indicated that carbothermal reduction is done. Unfortunately, the system did not trip.  Contact Gelo for the  next run, such that he can monitor the system and we can spot the problem.  Friday, January 31, 2020, 15:35 The EVP1 was vent with Ar and the P2N target was transferred to the glove box.

 Thursday, August 13, 2020, 14:33

XRD analysis of the P2N material showed that the carbothermal reduction was not completed

The material was loaded again in its oven, new Ta caps where secured to the edges, the body remained the same

The oven was set in the EVAP1 using Ar to avoid oxidation of the P2N material

Currently pumping down.

 Saturday, August 15, 2020, 14:45 

Vacuum is having a strange behavior, pressure shows that is going from 8e-11 to 4e-6 Torr (fig. 200815-Vaccum_P2N)

Proceeded to turn off turbo pump

Tuesday, August 18, 2020, 10:38

The IGP1 head was replaced with the EVAP1's IGP1 head

The vacuum will be started again

Marla Cervantes wrote:

Marla Cervantes wrote: Marla Cervantes wrote: Marla Cervantes wrote: Marla Cervantes wrote: 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.    Thursday, January 30, 2020, 11:51 Controls respond "It looks like the power supplies were tripped by either the pirani gauge (IEVAP:IGP1) or the Nuclear vent or by both. But, it did not look like that the interlock tree latched the bad condition when the power supplies tripped. I modified the PLC to properly latch the cause of the trip." and gave green light to restart the carbothermal reduction.  Thursday, January 30, 2020, 13:09 IGP1=5.9e-6Torr Ramp set to 1A/10s to 200 A Pressure rising too fast at 200 A, current reduced manually to 190 A Pressure start dropping and system tripped, notify to controls again, "The strip tool shows the vacuum level shoot down to 0 then shoot back up for a quick second but that is enough to tell the PLC that IGP is “bad”" Thursday, January 30, 2020, 15:58  Restarting process to try to trip the system on purpose  Initial pressure IGP1 = 2.7e-6Torr Ramp set to 1/A/10s to 200 A, 0.59 V Ramp set to 2A/10s to 300 A Max pressure during process IGP1 = 0.03 Torr Voltage increased and stabilized (see voltage rising). Ramp kept at 2A/10s to 400 A Thursday, January 30, 2020, 16:48  TGHT = 1.54 V, 399.744 A IGP1 = 0.00016 Torr and going down Ramp set to 2A/10s to 500 A Thursday, January 30, 2020, 17:02  TGHT= 1.9V, 499.2 A IGP1 = 0.00014 Torr Ramp set to 2A/10s to 600 A Ramp set to 0.5 A/min to 700 A, ramp stopped at 680 A Manually tapped to 697 A Pressure dropping indicated that carbothermal reduction is done. Unfortunately, the system did not trip.  Contact Gelo for the  next run, such that he can monitor the system and we can spot the problem.  Friday, January 31, 2020, 15:35 The EVP1 was vent with Ar and the P2N target was transferred to the glove box.  Thursday, August 13, 2020, 14:33 XRD analysis of the P2N material showed that the carbothermal reduction was not completed The material was loaded again in its oven, new Ta caps where secured to the edges, the body remained the same The oven was set in the EVAP1 using Ar to avoid oxidation of the P2N material Currently pumping down.  Saturday, August 15, 2020, 14:45  Vacuum is having a strange behavior, pressure shows that is going from 8e-11 to 4e-6 Torr (fig. 200815-Vaccum_P2N) Proceeded to turn off turbo pump Tuesday, August 18, 2020, 10:38 The IGP1 head was replaced with the EVAP1's IGP1 head The vacuum will be started again

 Tuesday, August 18, 2020, 20:44

The pressure reading are normal after swapping the IGP1's gauge head

Wednesday, August 19, 2020, 07:47 

XRD analysis of the P2N material showed that the carbothermal reduction was not completed

The material was loaded again in its oven, new Ta caps where secured to the edges, the body remained the same

The oven was set in the EVAP1 using Ar to avoid oxidation of the P2N material

See elog 263

Wednesday, August 19, 2020, 07:47

Good vacuum 1e-1 Torr

Bad vacuum 5e-1 Torr

IGP1 = 4.11e-6 Torr

Autoramp set to 1A/10s to 150 A.

Wednesday, August 19, 2020, 10:00

TGHT = .45 V, 149.8 A

IGP1 = 9.1e-5 Torr

 Autoramp set to 1A/10s to 200 A.

Wednesday, August 19, 2020, 10:13

TGHT = 0.6 V, 200.2 A

IGP1 = 3e-4 Torr and increasing

After 6 min:

good vacuum =  5e-2 Torr

bad vacuum = 1e-1 Torr

autoramp set to 1A/30s to 250 A

Since the pressure was decreasing, the ramp was changed to  1A/10s to 250 A, vacuum limits remained the same

Wednesday, August 19, 2020, 10:28

Good vacuum 1e-1 Torr

Bad vacuum 5e-1 Torr

IGP1 = 1.7e-4 Torr

TGHT =  0.78 V, 250.1 A

Autoramp set to 2.5 A/10 s to 700 A

Wednesday, August 19, 2020, 11:17

 Good vacuum 1e-1 Torr

Bad vacuum 5e-1 Torr

IGP1 = 2e-4 Torr

TGHT = 2.64 V, 699 A

Autoramp set to 2 A/10 s to 800 A

 Wednesday, August 19, 2020, 11:29

 Good vacuum 1e-1 Torr

Bad vacuum 5e-1 Torr

IGP1 = 5.2e-5 Torr

TGHT = 3.1 V, 798.8 A

Note: Voltage starts to become unstable, an power is around 2.3 kW, pressure has not increased enough to indicate reduction with certainty

In order to reach 3 kW autoramp set to 1A/10 s to 900 A

Wednesday, August 19, 2020, 12:18

The current was increased to 1000 A expecting to see a high peak in pressure but there was not an increase in preasure.

The target is being ramped down to 850 A 

 Tuesday, September 08, 2020, 20:44

A P2N oven with three heat shields, loaded with a graphite container filled with UO2/C ring-discs was set in the EVAP1

EVAP1 is currently being evacuated.

Wednesday, September 09, 2020, 10:11

IGP1 = 4.7e-6 Torr

Good vacuum 1e-1 Torr

Bad vacuum 5e-1 Torr

Autoramp set to 1A/10s to 150 A.

Wednesday, September 09, 2020, 10:50 

TGHT = .32 V, 149.8 A

IGP1 = 6.5e-5 Torr

Autoramp set to 1A/10s to 200 A 

Wednesday, September 09, 2020, 11:00

TGHT =0.46 V, 200 A

IGP1 =  6e-4 Torr and going up

good vacuum =  5e-2 Torr

bad vacuum = 1e-2 Torr

autoramp set to 1A/10s to 250 A

autoramp stopped at 215 A, since pressure kept increasing, the current was manually decreased to 180 A.

 Wednesday, September 09, 2020, 11:16

TGHT = 0.4 V, 179.7 A,

IGP1 = 8.5e-4 Torr an going down

good vacuum =  5e-2 Torr

bad vacuum = 1e-2 Torr

autoramp set to 1A/30s to 200 A

Wednesday, September 09, 2020, 11:32

TGHT = 0.46 V, 200.2 A,

IGP1 = 3e-3 Torr an going down

good vacuum =  5e-2 Torr

bad vacuum = 1e-2 Torr

autoramp set to 1A/30s to 300 A

Wednesday, September 09, 2020, 11:38

IGP1 = 1e-3 Torr 

Since the pressure was decreasing, the ramp was stopped at 210 and changed to  1A/10s to 300 A, vacuum limits remained the same

Wednesday, September 09, 2020, 11:53

The pressure reached the bad vacuum limit 1e-2 Torr and stopped

After ~8min the pressure limits were changed to:

good vacuum =  5e-2 Torr

bad vacuum = 1e-1 Torr

Wednesday, September 09, 2020, 12:05 

IGP1 = 1.15e-3 Torr

Autoramp set to 2.5 A/10 s to 700 A

Pressure increased! and ramp paused at 685 A

re-started autoramp to 700 A at 1A/10s

Wednesday, September 09, 2020, 13:56

Pressure kept increasing after 700 A, so autoramp was set to 750 A at  1A/10s

Pressure kept increasing

At 750 A pressure started reducing, autoramp was set to 760 A at 1A/10 s

System tripped suddenly (Gelo was notified)

The carbothermal reduction seemed complete 

 Thursday, September 10, 2020, 14:01

A P2N target was carbothermal reduced but at the maximum current, the power supply tripped (elog. 267)

Therefore, the target was not hot long enough to fully outgas, that is why it will be reheated.

Desired current 650 A

Thursday, September 10, 2020, 14:07 

IGP1 =  3.3e-6 Torr

Autoramp set to 650 A at 1 A/10 s 

Thursday, September 10, 2020, 16:06

Ramp reached desired current

TGHT = 2.4 V, 649 A

IGP1 = 3e-3 Torr 

 Friday, September 11, 2020, 11:17

TGHT = 2.24 V, 649.2 A

IGP1 = 3.7e-6 Torr

Friday, September 11, 2020, 12:55 

 TGHT = 2.2 V, 648.8 A

IGP1 = 3.7e-6 Torr

Autoramp set to 700 A at 1 A/10 s,

No more gas was released, the system was ramped down to 0 A at 2 A/min

Friday, September 11, 2020, 18:17

TGHT = 0.35 V, 133 A

IGP1 = 2.7e-6 Torr

 Friday, September 11, 2020, 20:01

TGHT = 0 V, 2.56 A

IGP1 = 2.6e-6 Torr

Monday, September 14, 2020, 16:19

EVAP1 was vented with Ar and the P2N material was transferred to the preparatory glove box. 

Green target material characteristics  (elog 105)

#discs = 49

Average disc thickness = 0.453mm

Empty cartridge weight = 9.42 g

Full cartridge weight = 39.86 g

UO2+C weight = 30.44 g 

Tuesday, March 30, 2021, 16:04

The target material was loaded in a P2N oven, wrapped with three heat shields, and set in the EVAP1

EVAP1 is currently being evacuated.

Wednesday, March 31, 2021, 09:42

IGP1 = 3.24e-6 Torr

Good vacuum 1e-1 Torr

Bad vacuum 5e-1 Torr

Autoramp set to 1A/10s to 150 A. 

Wednesday, March 31, 2021, 10:17

TGHT = .54 V, 149.88 A

IGP1 = 6.3e-4 Torr and increasing

Max pressure = 0.06 Torr

Wednesday, March 31, 2021, 10:33 

IGP1= 0.004 Torr

Autoramp set to 1A/10s to 200 A

Wednesday, March 31, 2021, 10:43

Maximum pressure 0.03 Torr and going down

Autoramp set to 1A/10s to 250 A

Wednesday, March 31, 2021, 11:04 

TGHT = 1.1 V, 299.9 A

IGP1 = 6e-4 Torr and going down

Autoramp set to 2.5 A/10 s to 700 A

Wednesday, March 31, 2021, 11:35

Ramp stopped at 690 A

TGHT = 2.9V, 689.1A

IGP1 = 0.127 Torr 

Wednesday, March 31, 2021, 11:37

Autoramp  set to 700 A at 1A/20s

Manually ramped to 740 A (3V) to make sure carbothermal reduction is done.

 Wednesday, March 31, 2021, 12:00

The power supply tripped, Gelo was monitoring the heating process.

Wednesday, March 31, 2021, 14:33

The target will be heated for 4 hours to get read of impurities.

IGP1 = 6e-6 Torr 

Autoramp set to 650 at 1A/10s 

Wednesday, March 31, 2021, 20:37

TGHT = 2.77 V, 669.6A 

IGP1 = 8.5e-6 Torr

EVAP1 ramped down to 0 A at 2 A/min

 Friday, August 17, 2018, 11:17

Four discs of UCx produced with the 1-step casting method were placed in a glass jar.

The mass of the discs was 0.400 g.

The glass jar with the discs were placed in the heating chamber of the IEVAP.

Currently IEVAP is pumping down until vacuum is in the order of  ~10^-6 Torr.

Friday, August 17, 2018, 16:28 

Final vacuum: 9.5x10^-6 Torr

IEVAP's heating chamber will be vented with air and the materials will be taken out.

 Friday, August 17, 2018, 17:27

Material was transferred to the glove box

Monday, October 07, 2019, 09:51 

A TaC coated target container  was loaded with a graphite cartridge with UCx

The target container has 3 heat shields

Tuesday, October 08, 2019, 09:51 

IGP1 = 1.9596e-6 Torr

Autoramp set up to:

TGHT= 1 A/min to 425 A (same current used to reach 1900C in evap2 when sintering TaC coating - e-log 241 evap2)

TBHT= 1 A/min 230 A

The limits are:

Good vacuum 5e-5 Torr

Bad vacuum 8e-5 Torr

Wednesday, October 09, 2019, 13:58

After 4 hours at maximum current, the current was ramped down at 1 A/min for both.

Wednesday, October 09, 2019, 14:00

EVAP1 was vented with Ar, and the target oven was removed to access the Ta cap.

The Ta cap difference in mass was 0.002 g

Wednesday, September 18, 2019, 07:48

A TaC coated target container  was loaded with a graphite cartridge with UCx

The target container has 3 heat shields

IGP1 = 9.3e-6 Torr

Autoramp set up to:

TGHT= 0.2 A/min to 438 A (same current used to reach 1900C in evap2 when sintering TaC coating - elog-455 evap2)

TBHT= 0.1 A/min 230 A

The limits are:

Good vacuum 5e-5 Torr

Bad vacuum 8e-5 Torr

Wednesday, September 18, 2019, 09:55

The autoramp where changed to 1 A/min on both the TGHt and the TGHT.

 Wednesday, September 18, 2019, 21:06

After 4 hours at TGHT = 4.15 V, 437.76 A and TBHT = 2.77 V, 228.31 A (and pressure of 1.07e-5 Torr)

The autoramp was set to TGHT = - 1 A/min and TBHT = -0.5 Torr

Tuesday, September 29, 2019, 14:05

 The EVAP1 was vented with Ar and the target was removed, 

The target was directly assembled after removing it from EVAP1

Finally, the assembly was transferred to the glove box

 Tuesday, September 24, 2019, 06:52

The target UCx28 that was previously conditioned e-log 241, was set again in the EVAP1 for re-conditioning,

the reason was to get rid of all the material that could evaporate from the target and has the potential of clogging the ionizer.

The heating conditions are the same as the previous conditioning:

TGHT= 1 A/min to 438 A (same current used to reach 1900C in evap2 when sintering TaC coating - elog-455 evap2)

TBHT= 1 A/min 230 A

IGP1 = 2.91e-6 Torr

 Wednesday, September 24, 2019, 18:30

IGP1 = 5.77e-6 Torr

The cooling conditions are the same as the previous conditioning:

TGHT= -1 A/min 

TBHT= -0.5 A/min

 Wednesday, September 25, 2019, 13:56

EVAP1 was vented with Ar,

The target container was removed to look at the Ta cap

The Ta cap was coated.

Wednesday, September 25, 2019, 13:58 

A new Ta cap was set in the transfer tube hole and the target container was installed again.

Wednesday, September 25, 2019, 14:00 

The target UCx28 that was previously conditioned , was set again in the EVAP1 for re-conditioning,

the reason was to get rid of all the material that could evaporate from the target and has the potential of clogging the ionizer.

EVAP1 currently pumping down.

Thursday, September 26, 2019, 07:09 

The heating conditions are the same as the previous conditioning:

TGHT= 1 A/min to 438 A (same current used to reach 1900C in evap2 when sintering TaC coating - elog-455 evap2)

TBHT= 1 A/min 230 A

IGP1 = 1.51e-6 Torr

Friday, September 26, 2019, 12:56

The cooling conditions are the same as the previous conditioning:

TGHT= -1 A/min 

TBHT= -0.5 A/min

Friday, September 27, 2019, 17:59

EVAP1 was vented with Ar, the target was removed from the heating chamber to exchange the Ta cap for a new one.

The old Ta cap was not fully coated and it presented a different coloration with respect to the 2 previous caps used for conditioning.

Friday, September 27, 2019, 18:03

The target UCx28 that was previously conditioned , was set again in the EVAP1 for re-conditioning,

the reason was to get rid of all the material that could evaporate from the target and has the potential of clogging the ionizer.

EVAP1 currently pumping down.

Saturday, September 28, 2019, 09:33 

The heating conditions are the same as the previous conditioning:

TGHT= 1 A/min to 438 A (same current used to reach 1900C in evap2 when sintering TaC coating - elog-455 evap2)

TBHT= 1 A/min 230 A

IGP1 = 1.419e-6 Torr

The ramping started at 9:36 am on Septemper 28th 

Sunday, September 29, 2019, 12:30

The cooling conditions are the same as the previous conditioning:

TGHT= -1 A/min 

TBHT= -0.5 A/min

Monday, September 30, 2019, 11:40 

After 23 hours being heated, the target was cooled down and EVAP1 was vented with Ar

The target was removed form EVAP1 and placed in the fumehood.

The tantalum cap used to collect the outgassed material from the target container was not fully coated.

The heat shields of the target container were removed and the target container was inspected,

the ends of the Ta container were crystallized, the area above the graphite cartridge does not have signs of crystallization. 

Monday, September 30, 2019, 10:54 

After being exposed to air for 1.5 hours,

the target UCx28 that was previously conditioned , was set again in the EVAP1 for re-conditioning.

The UCx28 was wrapped with 3 new Ta-heat shields and placed in the EVAP1, 

EVAP1 is currently pumping down.

Tuesday, October 1, 2019, 08:33

The heating conditions are:

TGHT= 1 A/min to 430 A 

TBHT= 1 A/min 230 A

Initial vacuum IGP1 = 1.22193-6 Torr

Since the ends of the target container are crystallized and the voltage is starting to vary, the target was heated only for 3 hours instead of 4.

The cooling conditions are the same as the previous conditioning:

TGHT= -1 A/min 

TBHT= -0.5 A/min

Wednesday, October 02, 2019, 11:01 

EVAP1 was vented with Ar and the target was removed form EVAP1 and assembled,

the assembly was placed in the glove box.

The tantalum cap used to collect the outgassed material from the target container was not fully coated.

 Tuesday, November 05, 2019, 16:43

A TaC coated target container  was loaded with a graphite cartridge with UCx

The target container has 3 heat shields

EVAP1 pumping down

Wednesday, November 06, 2019, 11:46 

IGP1 = 2.09e-6 Torr

Good vacuum 5e-5 Torr

Bad vacuum 8e-5 Torr

Autoramp set up to:

TGHT= 1 A/min to 465 A (same current used to reach 1865 C in evap2 when sintering TaC coating - e-log 464 evap2)

TBHT= 1 A/min 230 A

 Thursday, November 07, 2019, 10:15

After approximately 4 hours at maximum temperature the pressure was 5.85e-6 Torr and the autoramp was set to:

TGHT -1 A/min

TBHT -0.5 A/min

After 4 hours that the current stayed at 0 A, EVAP1 was vented with argon and the target was removed; before transferring the target to the preparatory glove box, the tantalum cap to collect deposits from the target was inspected, there was not deposits on it so it was determined that the conditioning was successful and the target was transferred to the preparatory glove box.

 Friday, May 24, 2019, 15:04

A TaC coated tantalum tube, loaded with graphite foils was transferred to EVAP1

https://elog.triumf.ca/TIS/Evaporator_2/445

The tueb will be heated with the same power used in EVAP2,

the power of the EVAP2 and EVAP1 will be matched using the fit from Document-126503

The chamber is currently pumping down

 Monday, May 27, 2019, 08:58

The current will be tapped to 50 A to replicate the procedure of EVAP2 

then the current will be set to 1 A/min to 500 A and increased to match with EVAP2 power.

 Wednesday, March 27, 2019, 08:50

A graphite insert was set into a tantalum tube in the evaporator 2 for 3 days

The objective of the test was to determine the current and voltage required to reach 2000 C

Current 424.2 A, voltage 7.17 V, P = 3 kW 

details can be find here https://elog.triumf.ca/TIS/Evaporator_2/433

The test will continue for 2 weeks in the EVAP1.

 Good vacuum 5e-4 Torr

Bad vacuum 1.00e-4

Pressure IGP1 = 1.55e-6 Torr

The autoramp was set to 420 A, at 1 A/min,

Monday, April 01, 2019, 07:57

TGHT = 4.68 V, 424.32 A

IGP1 = 9.61e-7 Torr

Autoramop is set to -1 A/min to 0 A

Monday, April 01, 2019, 11:19 

IGP1=5.43e-7 Torr

At TGHT = 223 A and 2.1 V the autoramp was increased to -2 A/min

Monday, April 01, 2019, 11:20

Sudden and unexpected  pressure increment to 1.4e-5 Torr, might be a glitch.

Monday, April 01, 2019, 13:10

IGP1 = 4.34e-7Torr

The autoramp was stopped at TGHT = 17.28 A, 0.0625 V,

and it was lower down to 0 A manually

 Results: The tantalum tube deformed in the contact points with the graphite insert

 Wednesday, April 10, 2019, 13:30

Tantalum foil caps were added to a graphite insert (see picture caps)

 The insert was set in a tantalum tube previously coated and wrapped with 3 Ta sheets.

The system was installed in the EVAP1, and it will be heated for a week at 2000 C.

Currently pumping down.

 Thursday, April 11, 2019, 13:26

IGP1 = 9.9e-7 Torr

The current is tapped to 40 A

After 1hr the autoramp is set to 1 A/min to TGHT 500 A

The TGHT current remained at 500 A for week

until at April 18 at ~4:30 pm

a localized power outage tripped the EVAP1.

The EVAP1 was ventd with air and the tantalum tube was removed

The tantalum tube did not break.

 Friday, April 05, 2019, 10:04

A tantalum tube was coated with TaC and wrapped with Ta heat-shield (3 layers)

Desired temp = 1900 C (expected TGHT ~445A/7.5V), TBHT will be set fixed at 230A (max).

Yesterday the tube was set in the EVAP1 and pumped down.

Friday, April 05, 2019, 10:07 

IGP1= 1.61e-6 Torr

The current is manually tapped to 40 A.

Friday, April 05, 2019, 13:25

After ~2 hours 

IGP1 = 1.54e-6 Torr

TGHT = 0.61 V, 40.39 A

Autoramp is set to 1 A/min to 400 A

Good vac at 3.00-5 Torr

Bad vac at 5.0e-5 Torr.

Sunday, April 07, 2019, 9:00

The current was increased to 424 A

Monday, April 08, 2019, 16:36

EVAP1 vented with air, sintered tube was removed. 

 Tuesday, October 30, 2018, 10:12

A new LP-SIS was coated and syntered (e-log 420 Evaporator_2) 

The container was loaded with a graphite insert loaded with UCx

Graphite insert + UCx mass = 26.927 g

A current of 440 A TGHT and 230 A TBHT will be inputed to the contianer

IGP1 = 8.72e-7 Torr

 The current was tapped manually to 440 A TGHT and 230 A TBHT (see fig. Heatinf test)

Maximum pressure during heating = 1.7e-3 Torr.

Target will stay at maximum current for 1 week.

Marla Cervantes wrote:

Tuesday, October 30, 2018, 10:12 A new LP-SIS was coated and syntered (e-log 420 Evaporator_2)  The container was loaded with a graphite insert loaded with UCx Graphite insert + UCx mass = 26.927 g A current of 440 A TGHT and 230 A TBHT will be inputed to the contianer IGP1 = 8.72e-7 Torr  The current was tapped manually to 440 A TGHT and 230 A TBHT (see fig. Heating test) Maximum pressure during heating = 1.7e-3 Torr. Target will stay at maximum current for 1 week.

 Wednesday, October 31, 2018, 10:09

The current tripped off,  around 5:00 am, the pressure was below 1e-5 Torr (see fig. current-trip_off).

On a previous test, we measured the maximum temperature of the power supply = 33.3 C (e-log 227).

Power supply overheating doesn't seem to be the problem.

EPICS windows are half withe and not answering correctly.

Also, TBHT says that IGP1 < 500 mTorr, and its interlock needs reset (see figure EPICS).