Fri Apr 8 14:51:37 2011:  Target is wrapped with 3 Ta-heat shields.  The evaporator has been pumped down for over 4 hrs, currently vac @ 2.8e-6 Torr.  (See attachment #1, note: the drops in the IG1 reading were due to Controls group helping to fix the alarm handler notifications for the pagers.)

 Fri Apr 8 14:56:21 2011:  TGHT @ 20A/0.079V, panel reads 18V.   Vac @ 2.73e-6 Torr.

Fri Apr 8 14:57:42 2011: TGHT @ 40A/0.165V, panel reads 18A.  Vac @ 2.73e-6 Torr. 

Fri Apr 8 14:59:51 2011: Auto heating begins.  (See Attachment#2 for the parameter setup).  The target heater will read to 820A at 21:30.  ISAC Ops will help to cool down the target at around 05:00 on Saturday; instructions will be given.

Mon Apr 11 09:37:40 2011:  Target was cooling on last Saturday April 9 by the help from ISAC Ops.  (See Attachment#3 for the cooling down process).

Mon Apr 11 09:42:09 2011 :  Evaporator is vented.

Mon Apr 18 18:10:53 2011: 

FEBIAD-HP target (w.o 38295-8) is coated with TaC (previously prepared on Feb 15, 2011).  This target will be used for the SiC run in Oct, 2011.  The target is wrapped with 3 Ta-heat shields and is in the evaporator.  Pumping down of the evaporator is in process, currently vac @ 3.66e-5 Torr.   

Tue Apr 19 11:00:36 2011: Evaporator has been pumped down over night (~17hrs).  Vac is currently at 1.84e-6 Torr (See Attachment#1: pumping down curve).

Tue Apr 19 11:09:49 2011: TGHT @ 30A/0.086V, Vac @ 1.82e-6 Torr.

Tue Apr 19 11:13:05 2011: TGHT @ 60A/0.184V, Vac @ 1.75e-6 Torr.

Tue Apr 19 11:14:06 2011: Auto-heating will begin @ 0.5A/min until vacuum is stable then the auto ramping rate will increase. (See Attachment#2: parameter setup).

Tue Apr 19 14:27:08 2011:  TGHT is currently at 148A/0.65V, vac @ 1.92e-5 Torr.  The pressure spiked up to 7.7e-5 Torr (trip @ 8e-5 Torr) at ~124A.  The current was lowered down to 120A to allow the pressure to come down (See Attachment#3: Vac_curve).   Auto-heating rate has changed to 1A/min. 

Wed Apr 20 10:08:52 2011:  TGHT reached to 700A and stayed for about 5 hours.  ISAC Ops helped to start the auto cooling down process.  (See Attachment#3: Overall Process). 

Tue Apr 26 11:12:36 2011

Result:  The dried coating isn't looking the same like the rest of the target.  Typically, the finished coating looks gray.  But a layer (or line) of light brown coating can been seen from one end of the target to the other end. 

--> This target was heated up to 700A.  Will try to re-heat this again to 820A. 

Re-heating the Target

Tue Apr 26 12:44:30 2011:  Target is wrapped with 3 Ta-heat shield and is in the evaporator which is currently being pumped down. 

Tue Apr 26 17:39:40 2011:  TGHT was tapped up to 70A before began with auto-heating @ 2A/min to 820A max.  Currently TGHT at 204A/1.0V, Vac @ 3.97e-6 Torr.  ISAC Ops will help to start auto cooling at 04:00 on April 27.

Wed Apr 27 12:26:41 2011: Auto cooling completed.  P/S off and evaporator is vented, (See Attachment#5: Overall Process_2).  Target oven looks good; finished surface looks gray, as expected. 

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.  

Wed Apr 6 17:06:56 2011: Target oven is wrapped with 3 Ta-heat shields.  Pumping down evaporator in progress.

Thu Apr 7 09:32:36 2011: Evaporator has been pumped down for over 16 hrs, vac @ 1.74e-6 Torr (see attachment#1).   Target heater is turned on and about to ramp up.

 Thu Apr 7 09:37:11 2011: TGHT @ 20A/0.071V, panel reads 18A.

Thu Apr 7 09:38:16 2011: TGHT @ 40A/0.147V, panel reads 37A.

Thu Apr 7 09:40:53 2011:  Auto-heating begins.  (See attachment#2 for Parameter Setup)

Fri Apr 8 10:08:07 2011:  Auto-cooling process began last night at 8:30pm.  Instructions were given to the on shift ISAC-Ops to being the auto cooling.  The process was finished this morning at around 3am.  (See attachment#3 for the cooling down process).  The evaporator p/s is off and ready to be vented.

Thu Apr 14 09:52:59 2011: Target is wrapped with 3-Ta heat shield and ready to go into the evaporator. 

Thu Apr 14 11:57:29 2011: The process is on hold until the problem with the screw and the washer of the evaporator is resolved.  See ID#15 for more details.

Fri Apr 15 11:22:27 2011:  The shorter fully threaded bolts and un-threaded washer are being used. 

Fri Apr 15 11:23:30 2011:  Target is in the evaporator and ready for the fin diffusion bonding.  The evaporator is currently being pumped down.

Fri Apr 15 15:57:40 2011: TGHT @ 20A, Vac @ 4.53e-6 Torr.  ISAC Ops will help to start the auto heating process at 18:00hr tonight  and  begin the auto cooling on April 16 @ 18:00 hr. 

 Mon Apr 18 10:53:39 2011:  Target was heated @ 820A over the weekend and pumped down on Saturday April 16 in the evening.  P/S is off and evaporator is vented.  (see Attachment#1 for the striptool)

Mon Apr 18 12:16:22 2011:  Target fin diffusion bonding is nicely done, and the evaporator shows no sign of any coating.  It looks like the problem from the bolts and washers is resolved.  

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

 Tuesday, April 19, 2016, 09:47

Temperature measurements have been taken in evap2 on target containers. 

Previously all UCx targets have been conditioned in evap1 at 520A. The respective target containers TaC coating was sintered in evap2 at a different current.

All future UCx targets will now be conditioned in evap1 at the same current required to reach 1900C in evap2 when sintering the TaC coating on the container to be used for the respective target.

ie. If a container is being sintered in evap2 at 450A [1900C], this same container is used for UCx - then that specific UCx target will be conditioned in evap1 at 450A.

Confirm full carbonization has been achieved by following with the vacuum on the strip tool and make sure the final vacuum comes down at the end of the whole process.

March 23, 2011

12:30: Target oven is wrapped with 3 Ta-heat shields.  Pumping down evaporator

18:24: IEVAPIG1 is reading at 4.55e-6 Torr.  The p/s will be turned on tomorrow since there is no ISAC Ops on site. 

March 24

11:57: Evaporator has pumped down over night.  Vacuum @ 2.01e-6 Torr.  

14:42: TGHT @ 20A, Vac @ 1.65e-6 Torr.

14:52: TGHT @ 40A, Vac @ 1.66e-6 Torr.

14:52: Auto Heating begins: TGHT to max 820A.  Incrementing if vac < 4.5e-5 Torr, backing off if vac > 6.5e-5 Torr.

 16:04: TGHT @ 181A, vac @ 7.59e-6 Torr.

18:03: TGHT @ 420A, vac @ 4.71e-6 Torr.   (See attachment 2 for TGHT/IG1 for the past 4 hours)

March 25,

11:15:  TGHT has been at 820A for 14hr.  Vac @ 4.27e-6 Torr.  (See attachement 3 for TGHT/IG1 for these past hours)

11:17:  Auto cooling down is in progress...

17:21:  Auto cooling down ended at TGHT ~100A.  The TGHT was tabbed down manually from 100A to zero.  (See attachment #4 for the cooling down progress)

John Wong wrote:

March 23, 2011 12:30: Pumping down evaporator 18:24: IEVAPIG1 is reading at 4.55e-6 Torr.  The p/s will be turned on tomorrow since there is no ISAC Ops on site.  March 24 11:57: Evaporator has pumped down over night.  Vacuum @ 2.01e-6 Torr.   14:42: TGHT @ 20A, Vac @ 1.65e-6 Torr. 14:52: TGHT @ 40A, Vac @ 1.66e-6 Torr. 14:52: Auto Heating begins: TGHT to max 820A.  Incrementing if vac < 4.5e-5 Torr, backing off if vac > 6.5e-5 Torr.  16:04: TGHT @ 181A, vac @ 7.59e-6 Torr. 18:03: TGHT @ 420A, vac @ 4.71e-6 Torr.   (See attachment 2 for TGHT/IG1 for the past 4 hours) March 25, 11:15:  TGHT has been at 820A for 14hr.  Vac @ 4.27e-6 Torr.  (See attachement 3 for TGHT/IG1 for these past hours) 11:17:  Auto cooling down is in progress... 17:21:  Auto cooling down ended at TGHT ~100A.  The TGHT was tabbed down manually from 100A to zero.  (See attachment #4 for the cooling down progress)

 All the pumps are off.  The evaporator will be vented next week. 

John Wong wrote:

John Wong wrote: March 23, 2011 12:30: Pumping down evaporator 18:24: IEVAPIG1 is reading at 4.55e-6 Torr.  The p/s will be turned on tomorrow since there is no ISAC Ops on site.  March 24 11:57: Evaporator has pumped down over night.  Vacuum @ 2.01e-6 Torr.   14:42: TGHT @ 20A, Vac @ 1.65e-6 Torr. 14:52: TGHT @ 40A, Vac @ 1.66e-6 Torr. 14:52: Auto Heating begins: TGHT to max 820A.  Incrementing if vac < 4.5e-5 Torr, backing off if vac > 6.5e-5 Torr.  16:04: TGHT @ 181A, vac @ 7.59e-6 Torr. 18:03: TGHT @ 420A, vac @ 4.71e-6 Torr.   (See attachment 2 for TGHT/IG1 for the past 4 hours) March 25, 11:15:  TGHT has been at 820A for 14hr.  Vac @ 4.27e-6 Torr.  (See attachement 3 for TGHT/IG1 for these past hours) 11:17:  Auto cooling down is in progress... 17:21:  Auto cooling down ended at TGHT ~100A.  The TGHT was tabbed down manually from 100A to zero.  (See attachment #4 for the cooling down progress)  All the pumps are off.  The evaporator will be vented next week.

 Evaporator Vented.

According to Jonathan Aoki, the electricians will be servicing another MCC which will result in loss of cooling water for about 8 hours starting at 16:00 March 30.  We shouldn't be running the evaporator or any condensers at that time.

It's the NON-ACTIVE water that will go off.  The evaporator is on sity water, so it will be OK.

The evaporator ion gauge filament burnt out on May 11, 2011.  A target was in the evaporator at that time and was about to being the sintering process.  The gauge had two filaments, so vacuum group helped to switch to the second filament.  The evaporator was vented on May 17, 2011, and a new ion gauge with two filaments was installed.  The gauge was tested and it's working fine. 

Wednesday, September 07, 2011, 11:18:  

IEVAP:CG2 @ 52mT before oil change. 

Edi D.V changed the oil for the backing pump.  WP#2011-09-07-2. CG2 currently @ 21mT.

2011-09-01:

• Glove box was leaking (air/argon) between base and box. Light was shining through.
• Removed old neoprene seal at base.
• Resealed glove box between base and box with DAP Butylflex. No light shining through after repair.
• Replaced rubber disks at 4 feed-throughs.
• Maico Dalla Valle replaced the inner ring on the glove ports. See dwg ITA2954 and ECO-2418.
• After the repair, the glove box has a significantly reduced leak, estimated to a few liters per minute at an air pressure of  0.5" H₂O.

Evaporator drawings can be found on ITA2900D

Work Permit: 2011-09-01-2 

Friday, September 09, 2011, 10:05

Target oven coated with TaC, and wrapped with 3-Ta heat shields.  Chamber is currently being pumped down. 

TGHT @ 140A, IG 9.2 e-6 Torr, BP 20mT. 

Started auto heating, rate @ 2A/min, to max current of 820A. 

Friday, September 09, 2011, 12:25

Evaporator tripped off at 163A. 

Stepped TGHT back to 160A.  Vacuum holding at 4.3e-5 Torr.

Monday, September 12, 2011, 09:55

Evaporator was cooled down over the weekend. 

Chamber will be vented shortly.

See attachment#1: striptool

 Tuesday, June 12, 2012, 14:38

The backing pump oil was changed (ISAC WP#2012-06-12-1). 

Friday, October 04, 2013, 15:37

A LP target container is coated with TaC.  The container is wrapped with 3 layers to heat shield.  

This container will be used for the graphite tube test.  

Chamber is being pumped down.

 The HS cooling water valves are open and no leaks are detected. 

TGHT will be ramped up to 580A at 0.2A/min

TBHT will be ramped up to 230A at 0.2A/min.

The temperature will be monitored and measured.