Logbooks Lab Maintenance Evaporator_1 Evaporator_2 Laser cutter Target Production Test-Stand RH-ISAC RH-Cyclotron RH-Meson Hall RH-Beamlines RH-ARIEL
  Evaporator_1, Page 8 of 15  Not logged in ELOG logo
ID Date Author Target Material Target Oven W.O# Source Status Subjectdown
  71   Thursday, July 11, 2013, 16:22 John WongUO2/CTarget boat #2 DoneProcessing UC2 flakes (batch#05 - 18062013)

Peter Kunz wrote:

 

1. stage - burning off organics complete

2. stage - carbonization began 1-8 am 2013/07/02

 Thursday, July 11, 2013, 16:11

EPICS was down and wiped out all the strip tools, but Evap stayed on.  Data archivers showed the system was down at around mid-night on July 10 - no data was archived for 12 hours. 

TGHT has stayed at 520A (max) for at least 4 hours since I started the Evap EPICS back.

Vacuum is currently at 7.7e-6 Torr. 

The carbonization process is complete.

Auto-cool down in process - at 1A/min.


 

  72   Monday, July 15, 2013, 09:45 John WongUO2/CTarget boat #2 DoneProcessing UC2 flakes (batch#05 - 18062013)

John Wong wrote:

Peter Kunz wrote:

 

1. stage - burning off organics complete

2. stage - carbonization began 1-8 am 2013/07/02

 Thursday, July 11, 2013, 16:11

EPICS was down and wiped out all the strip tools, but Evap stayed on.  Data archivers showed the system was down at around mid-night on July 10 - no data was archived for 12 hours. 

TGHT has stayed at 520A (max) for at least 4 hours since I started the Evap EPICS back.

Vacuum is currently at 7.7e-6 Torr. 

The carbonization process is complete.

Auto-cool down in process - at 1A/min.


 

 Monday, July 15, 2013, 09:43

The TGHT reached to zero on Friday and the chamber has been left under vacuum over the weekend, currently at 1.3e-6 Torr.

The chamber will be vented in Ar and the UC2 flakes will be transported into the Ar-glove box.

The process is complete


 

  64   Monday, May 06, 2013, 14:34 John WongUO2/CTarget boat #2 DoneProcessing UC2 flakes (batch#04 - 05032013)

Monday, May 06, 2013, 14:29

UO2/C green was prepared on May 2, 2013 and let dry over the weekend.

UO2 powder used = 50.36g   (Inventory R-00835A UO2 + bottle = 896.30)

Graphite powder used = 10g

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

The Ta-target boat was wrapped with 3-Ta heat shields and installed in the Evap#1

The chamber is currently being down down.

The target 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, May 07, 2013, 11:12

Currently, IG @ 5.6e-6 Torr; BP @ 25mTorr.  Vacuum spikes intermittently...

Stepping up TGHT to 50A.  After about 15 min, vacuum climbed up to 5.5e-5 Torr. 

Lowered TGHT to 25A, and continue heating at that current...


 Tuesday, May 07, 2013, 12:18

Vacuum is coming down to 2.6e-5 Torr.

Auto-heating initiated...


 Friday, May 24, 2013, 14:19

The carbonization process has come the end.

TGHT has reached to 520A for ~14hrs. 

IG1 @ 6.34e-6 Torr, BP @ 25mTorr.

Autocooling is initiated; ramping rate @ 1A/min.

The chamber will be remained under vacuum, and will be vented in Ar next week.


 Monday, May 27, 2013, 14:11

The chamber was vented with Ar. 

UC2 was transfered to the Ar glovebox. 

Evap#1 is off.


 Wednesday, May 29, 2013, 17:14

See attachment#1 for TGHT vs IG1 data retrieval.


 

Attachment 1: UC2_flakes_batch#04-05032013.PNG
UC2_flakes_batch#04-05032013.PNG
  78   Thursday, September 19, 2013, 15:41 Laura LambertUO2/CTarget Boat #2 In progressProcessing UC2 flakes (batch #07 - 09192013)

Thursday, September 19, 2013, 15:35

UO2/C green was prepared on Aug 17, 2013. The slurry was cast on a piece of glass coated with WD40.

The cast was let dry until Aug 19, 2013.

Initial UO2 powder used = 49.97g (Inventory R-00835A UO2 + bottle = 745.42 before use)

Graphite powder used = 10.12g

Green cast dried UO2/C + organic mass = 59.62g

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

The Ta-target boat was wrapped with 3-Ta layers of heat shield and installed in Evap1 on Sept 19, 2013.

Chamber is currently being pumped down. IG1 @ 9.97e-12T.

Target 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


 

  269   Tuesday, March 30, 2021, 16:04 Marla CervantesUO2/CP2N-02 DoneP2N-3 carbothermal reduction

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

  267   Tuesday, September 08, 2020, 20:45 Marla CervantesUO2/CP2N-02 DoneP2N-2 carbothermal reduction

 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


Wednesday, September 09, 2020, 12:36

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 

Attachment 1: P2N-2-CR-1.PNG
P2N-2-CR-1.PNG
  268   Thursday, September 10, 2020, 14:07 Marla CervantesUO2/CP2N-02 DoneP2N-2 Conditioning

 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. 

  253   Wednesday, January 29, 2020, 10:11 Marla CervantesEmptyP2N-02 DoneP2N test#2
The assembly consists of two tantalum foils, 0.001" thick, which are radially crimped to form a cylindrical surface. The outside support are two P2N  conditioning legs, and the inside supports are tantalum tapered rings. The solidworks geometry for this test is ITD0811 in PDM. 
 
 The P2N is attached to EVAP1 with copper legs and copper shims. A current ramp up to 600 A on the target wrapped with heat shields is attempted to benchmark the current/voltage increase in a bare target, so that we have reference values for future rampings with graphite and target material inside. 
The heat shields consist on two layers of Ta sheets on the body of the P2N secured with Ta-wire and two layers of Ta sheets on one side of the P2N.

Tuesday, January 28, 2020, 10:11

A P2N container  with heat shields, and without graphite container was installed in the EVAP1

Chamber is currently being evacuated.


Wednesday, January 29, 2020, 10:12

Pressure IGP1=1.87e-6 Torr

Final desired current TGHT = 600 A

Manually tapped to 40 A.

Voltage increased accordingly in an stable way.


Wednesday, January 29, 2020, 10:33 

Autoramp is set to 3/30s to 300 A 

The voltage and vacuum were stable so the autoramp was kept at 4/30s and the final current was set to 600 A

Accidentally went up to 600 A (1.98 V)!

When updating autoramp to 600 A, did not realize that procedure status was Active.

NOTE: If the procedure status is "active" the heater autoramp, does not "ramp" the current input in "final value", it will go in one step to that current.

The current was manually ramp down to 300 A

TGHT=299.52A, 0.89 V


Wednesday, January 29, 2020, 13:25

After approximately 2 hours conditions IGP1=1.6e-6Torr, TGHT =300 A, 1V.

The current ramp was started again: 4A/30s  to final value of 600 A


 Wednesday, January 29, 2020, 14:07

After 15 min, TGHT=599.424A, and 1.983 V (unstable) (see figure "P2N-test2_final voltage")

The current was ramp down to 0 A  at -5A/20s 


EVAP1 was vented with aair and the container was removed,

the copper shims and legs did not present signs of damage

the body's tantalum sheet had wrinkles inside,

the tantalum foils unfasten a bit, but were adjusted.

Attachment 1: P2N-test2_final_voltage.JPG
P2N-test2_final_voltage.JPG
Attachment 2: P2N-test2.JPG
P2N-test2.JPG
  252   Wednesday, January 22, 2020, 18:10 Marla CervantesEmptyP2N-02  DoneP2N test#1
The assembly consists of two tantalum foils, 0.001" thick, which are radially crimped to form a cylindrical surface. The outside support are two P2N  conditioning legs, and the inside supports are tantalum tapered rings. The solidworks geometry for this test is ITD0811 in PDM. 
 
A first current ramp up to 600 amperes on the bare naked target is attempted to benchmark the current/voltage increase in a bare target, so that we have reference values for future rampings with graphite and target material inside. 

Wednesday, January 22, 2020, 18:07

A P2N container  with no heat shields, and no graphite container was installed in the EVAP1

Chamber is currently being evacuated.


 Thursday, January 23, 2020, 09:45

Pressure IGP1=1.87e-6 Torr

Final desired current TGHT = 600 A

Manually tapped to 40 A

 The voltage looks ok, at 32 A the voltage's behavior change (see picture "voltage at 32 A") but is stable


Thursday, January 23, 2020, 13:20

Autoramp is set to 4/30s to 300 A 

The voltage and vacuum were stable so the autoramp was kept at 4/30s and the final current was set to 600 A

At 600 A the voltage was 2.4 V, the current and voltage remained stable for 1 hour (see figures 600A and 600A-zoomed)


Thursday, January 23, 2020, 15:57

The current was ramp down to 0 A  at -5A/20s 


Thursday, January 23, 2020, 16:36 

After 10 min at 0A, the current was ramp up to 600 A at 4A/30s.

At 600 A the voltage was 2.43 V (TGHT)

The container was left at 600 A overnight.


Friday, January 24, 2020, 10:51

The PN2 stayed at 600 A for 15 hrs

The voltage increased 0.1 V during the first 7hr at 600 A and then it stabilized at 2.5 V (see figure "second ramp voltage")


Friday, January 24, 2020, 10:57

The current was ramp down to 0A at -5A/20s  


 

Attachment 1: p2n_conditioning_-_Naked_target_installed.jpg
p2n_conditioning_-_Naked_target_installed.jpg
Attachment 2: voltage_at_32_A.JPG
voltage_at_32_A.JPG
Attachment 3: 600A.JPG
600A.JPG
Attachment 4: 600A-zoomed.JPG
600A-zoomed.JPG
Attachment 5: First_current_ramp_up.JPG
First_current_ramp_up.JPG
Attachment 6: Second_ramp_voltage.JPG
Second_ramp_voltage.JPG
  254   Thursday, January 30, 2020, 09:37 Marla CervantesUO2/CP2N-02 In progressP2N target material carbothermal reduction

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 

  255   Thursday, January 30, 2020, 10:15 Marla CervantesUO2/CP2N-02 ProblemsP2N target material carbothermal reduction

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.

 
  256   Thursday, January 30, 2020, 11:53 Marla CervantesUO2/CP2N-02 Problems resolvedP2N target material carbothermal reduction

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.

  257   Thursday, January 30, 2020, 13:11 Marla CervantesUO2/CP2N-02 ProblemsP2N target material carbothermal reduction

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.

Attachment 1: voltage-rising.JPG
voltage-rising.JPG
  258   Friday, January 31, 2020, 15:36 Marla CervantesUO2/CP2N-02 DoneP2N target material carbothermal reduction

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.

Attachment 1: P2N-Carbothermal_reduction.JPG
P2N-Carbothermal_reduction.JPG
  263   Thursday, August 13, 2020, 14:37 Marla CervantesUO2/CP2N-02 ProblemsP2N target material carbothermal reduction

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

Attachment 1: 200815-Vacuum_P2N.PNG
200815-Vacuum_P2N.PNG
  265   Tuesday, August 18, 2020, 20:45 Marla CervantesUO2/CP2N-02 Problems resolvedP2N target material carbothermal reduction

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

  279   Wednesday, April 13, 2022, 10:55 Luca EgoritiUC2 P2N-SISDoneP2N carbothermal reduction P2Ncartridge-220323

Wednesday, April 13, 2022, 10:50

P2NC-220323

Preparing the P2N-UCx for online operation on June 2022

Two cartridges were filled with annular UO2/C foils last week.

48 cartridges total

Today, Darwin and I are placing one of the two cartridges in the EVAP1. The cartridge is P2NC-220323.

 


Thursday, April 14, 2022, 09:34

Carbothermal reduction heating process started with a ramp rate of 3 A/min

Pressure 1.8E-6T

 


Thursday, April 14, 2022, 10:31

Paused autoramp because pressure increasing too rapidly. Will continue ramp up once pressure stabilizes.

 


Thursday, April 14, 2022, 11:20

autoramp restarted @3A/min

IGP1=2.7E-4 Torr

 


Thursday, April 14, 2022, 13:24

After first major outgass finished and pressure trending down, increased autoramp to 5A/min to 600A


Thursday, April 14, 2022, 13:27

IGP1 = 3.3E-4A

TGHT = 600A, 2.5V

decrease ramp rate to 3A/min to 650A


Thursday, April 14, 2022, 13:45

Set autoramp to 670A


Thursday, April 14, 2022, 13:52

paused autoramp at 668A because pressure increase too steep. 

Changed ramp rate to 0.5A/min and restarted ramp up to 700A


Thursday, April 14, 2022, 15:20

Continued increase in current towards 700A while pressure decrease indicated completeness of reduction.

Started rampdown to 650A.

Pressure was 1.7E-4 Torr on IGP1


Friday, April 15, 2022, 06:28  

The current was reduced to 500A @ 3:50 PM yestesterday.

Currently, TGHT = 500A, 2.0V

started aurtoramp down @ -2A/min

IGP1= 2.4E-6 Torr

 


Monday, May 02, 2022, 12:32

Cartridge reloaded onto EVAP 1. Will heat back up to check carbothermal reduction. 


Tuesday, May 03, 2022, 08:40

IGP1= 1.32e-6 Torr

Good vacuum 1e-1 Torr

Bad vacuum 5e-1 Torr

Autoramp set to 1A/10s to 500A

Autoramped up to 750A @ 1A/10s.  Only slight pressure increases observed areound 150A and 650A to 700 A.  Parameter curves will be evaluated.


Tuesday, May 03, 2022, 11:11

Started rampdown at -1A/10s. 

IGP1 was 3.0e-5 Torr and trending down when rampdown started

 

 

  280   Wednesday, May 04, 2022, 09:47 Luca EgoritiUC2 P2N-SISDoneP2N carbothermal reduction P2NC220408

 Wednesday, May 04, 2022, 09:42

Yesterday, a second graphite cartridge was installed in EVAP1, it consists of the old, 3-body cartridge design, and was sanded on the outside to be able to fit a P2N container. 

 

 


First I tried ramping manually, but the heating tripped because pressure was too high.

Then the parameters were set as previously, but it tripped again

IGP1= 2e-5 Torr

Good vacuum 8e-2 Torr

Bad vacuum 5e-1 Torr

Autoramp set to 1A/10s to 500A

Autoramped up to 700A @ 1A/10s. 

 

Wednesday, May 04, 2022, 11:40

Another ramping trial, with different heating rate:

IGP1= 3e-5 Torr

Good vacuum 8e-2 Torr

Bad vacuum 5e-1 Torr

Autoramp set to 1A/20s to 700A

Autoramped up to 700A @ 1A/20s.  

 

Wednesday, May 04, 2022, 15:50

IGP1= 3e-2 Torr

Good vacuum 8e-2 Torr

Bad vacuum 5e-1 Torr

Autoramp set to 1A/20s to 730A

Autoramped up to 720A @ 1A/20s.  

Pressure dropping while current is increasing at autoramp rate.

 

Wednesday, May 04, 2022, 16:10

From 730A, once the pressure went down to ~1E-3T, the current was suddenly raised to 750A and 770A to see if significant pressure increase was noticed, but small bumps reaching 1.5E-3T were not considered a sign of further reduction.

The rampdown started from a pressure ~1E-3T, from 770A to zero with rate 2A/10s 

 

 

 

  266   Wednesday, August 19, 2020, 07:49 Marla CervantesUO2/CP2N-02 DoneP2N carbothermal reduction (#2)

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 

Attachment 1: P2N.PNG
P2N.PNG
  22   Wednesday, May 18, 2011, 13:13 John WongSiC38295-8HP-FEBIADProblemsOrganics burnoff & Sintering

Wed May 18 13:12:24 2011:  Target is wrapped with 3 Ta-heat shields and is installed in the evaporator which is being pumped down.

Wed May 18 23:11:42 2011:  TGHT was raised to 40A and held for about 6 hours; Vac gradually came down to 2.1e-6 Torr.  TGHT increased to 90A and pressure is going up, currently vac @ 2.9 e-5 Torr.  Auto heating will begin soon at 0.5A/min --> 820A.  

Thu May 19 10:23:34 2011:  TGHT at 92A/0.32V, vac @ 4.47 e-5 torr.  (See Attachment#1: heating_past_12hrs)

Tue May 24 10:22:59 2011:  TGHT reached to max currrent 820A and held for over the long weekend.  The cooling process began at 15:00 yesterday.  Evaporator is vented.  P/S off.

 


Mon May 30 17:03:01 2011

The end caps of the target after the sintering process were found damage; the caps were vaporized just like the previous SiC target w.o#38481-8.  (See attachments#2: SiC000-003).  After some investigation, it looks like some reaction had occurred when the target heater was ramped up beyond 550A.  (See Attachment#3: SiC_striptool).

The yellow solid will be analyzed using EDX/SEM.  More details will be posted later....


Wednesday, September 14, 2011, 10:16 

SEM/EDX were done.  See attachment #9 for the EDX results. 

The formation of the yellow solid is the condensation of silicon.  As seen on the EDX results, the solid is mainly Si, C and some trace of Al (could be from the loading rod).  

The new D-end cap has be used to allow a better out-gassing.  

 

 

 

Attachment 1: heating_past_12hrs.jpg
heating_past_12hrs.jpg
Attachment 2: SiC_000.png
SiC_000.png
Attachment 3: SiC_001.png
SiC_001.png
Attachment 4: SiC_002.png
SiC_002.png
Attachment 5: SiC_striptool.png
SiC_striptool.png
Attachment 6: SiC_EDX.jpg
SiC_EDX.jpg
ELOG V2.9.2-2455