John Wong wrote:

Laura Lambert wrote:  Friday, October 17, 2014, 11:47 Target container was previously coated with TaC spray and sintered. It's is wrapped with 3 layers of Ta-heat shield, including the center block. The target consists of 255 discs of UCx with 10.5cm in length. A regular TaC coated endcap is inserted right, wrt the ionizer tube pointing down, so the left is open with a removable half-cap to allow out-gassing. The chamber was pumped down overnight. TGHT will be ramped up to 520A - keep heating the current for 4-5 hours. Parameter setup: 5.0e-5 good vac, 6.0e-5 bad vac. Auto ramp at 0.1A/min.  Friday, October 17, 2014, 13:25 IG1 = 2.6e-6 Torr Manually stepped up to 35A Waited ~1hr15 IG1 = 4.2e-6 Torr Initiating auto-ramp.    Monday, October 20, 2014, 14:10 There were two big power bumps occurred on Saturday Oct 18 and wiped all the IOC/PLC on the Evaporators.   All the system, including TGHT/pumps/EPICS/Alarm handlers were found off.  The ion gauge was turned on this morning and showed the pressure was around 16mTorr. (see attachment). The pump has been turned back on; pressure is currently at 3.5e-6 Torr. Ramping up TGHT...  Monday, November 03, 2014, 12:05 TGHT has reached to 580A and the target has conditioned at that current for about 3 days.  Cooling down at 2A/min.  Wednesday, November 05, 2014, 16:40 UCx conditioning complete. Target is now in the Ar-glove box.  End caps are inserted but need to be expanded. Need to insert Re foil prior to assembly.

 Monday, November 10, 2014, 13:48

UCx was being assembled, but as one of the endcaps was being expanded, the target container broke [friday nov 7th].

attempting to recover the materials and re-load into a new container now...

 Monday, November 10, 2014, 15:52

new target materials weight total [incl graphite] = 23.368g

(33.994g of materials taken out of broken target)

Thursday, August 01, 2013, 16:16

The target container was previously coated with TaC and sintered in Evap 2.

The target is loaded with 210 discs of UCx (material from batch # 04 - 05032013)

Total length = 7.2cm

The container is wrapped with 3 layers of Ta-heat shield, including the back block.

A regular TaC coated / sintered endcap is inserted on left, wrt the ionizer tube pointing out of the page. The right end is open with no cap.

The chamber is pumping down.

Instructions for conditioning the UCx target:

1. TGHT will need to heat up to ~ 175A to burn off the organics.

    Parameter setup: 5.0e-5 good vac, 6.0e-5 bad vac. The auto-ramping rate is set to 0.1A/min.

2. Once the organics have burnt off, ramp down the TGHT to 0A at 2A/min.

3. Purge the glovebox with argon gas.

4. Vent the chamber with Ar gas. Close the valve when it is completely vented.

5. Remove the target. Be careful the left end (view from the top) is open with the D-cap.

6. Clean the chamber with TCE and remove all the gunge.

7. Install the target back

8. Pump down the chamber to at least low 10e-6 Torr before begin the final carbonization process.

9. Auto-ramp the TGHT current to 175A at 1A/min.

10. Once the TGHT reach to 175A. Auto-ramp TGHT to 520A at 0.1A/min.

11. At 520A, keep heating the target for at least 4-5 hours.

12. Auto ramp TGHT to 0A at 2A/min.

13. Purge the glovebox with argon for at least 5 min.

14. Vent the chamber with argon gas. Close the valve when it is completely vented.

15. Remove the target from the chamber and put in the "orange james bond box" and transport to the Ar-glove box.

Done!

Laura Lambert wrote:

Thursday, August 01, 2013, 16:16 The target container was previously coated with TaC and sintered in Evap 2. The target is loaded with 210 discs of UCx (material from batch # 04 - 05032013) Total length = 7.2cm The container is wrapped with 3 layers of Ta-heat shield, including the back block. A regular TaC coated / sintered endcap is inserted on left, wrt the ionizer tube pointing out of the page. The right end is open with no cap. The chamber is pumping down. Instructions for conditioning the UCx target: 1. TGHT will need to heat up to ~ 175A to burn off the organics.     Parameter setup: 5.0e-5 good vac, 6.0e-5 bad vac. The auto-ramping rate is set to 0.1A/min. 2. Once the organics have burnt off, ramp down the TGHT to 0A at 2A/min. 3. Purge the glovebox with argon gas. 4. Vent the chamber with Ar gas. Close the valve when it is completely vented. 5. Remove the target. Be careful the left end (view from the top) is open with the D-cap. 6. Clean the chamber with TCE and remove all the gunge. 7. Install the target back 8. Pump down the chamber to at least low 10e-6 Torr before begin the final carbonization process. 9. Auto-ramp the TGHT current to 175A at 1A/min. 10. Once the TGHT reach to 175A. Auto-ramp TGHT to 520A at 0.1A/min. 11. At 520A, keep heating the target for at least 4-5 hours. 12. Auto ramp TGHT to 0A at 2A/min. 13. Purge the glovebox with argon for at least 5 min. 14. Vent the chamber with argon gas. Close the valve when it is completely vented. 15. Remove the target from the chamber and put in the "orange james bond box" and transport to the Ar-glove box. Done!

 Monday, August 05, 2013, 07:51

Chamber has been pumped down over the weekend.  IG1 currently at 2.65e-6 Torr,

Stepped up TGHT to 20A. 

Monday, August 05, 2013, 08:01  

Vacuum seems stable.  

Initiated auto-ramping for TGHT to reach 175A at 1A/min. 

 Sunday, August 11, 2013, 21:23

TGHT has reached to 175A; target has heated at that current for ~28hours.  

Vacuum is currently at 2.9e-6 Torr, BP @ 31mTorr. 

Cooling target down to 0A at 2A/min. 

The chamber will be vented in Ar tomorrow for cleaning. 

 Monday, August 12, 2013, 17:37 (Interesting day....Close call )

Early this morning, the target was removed from the chamber.  As it was transferred to the "orange" seal-box, half the length of the UCx discs fell out from the opening end of the container. 

The discs and the target were transferred to the Ar-glove box.  Tried to fill back the discs but only a few could get in; most of the discs were cracked;

Used the recently prepared UC flakes from Batch#5-18062013 to fill up the target. 

Total length remained the same ~7.2 cm.

The chamber was cleaned;

The target is now installed back in the chamber, and it's currently being pumped down.

The right end remains open (wrt. the ionizier pointing out of the page). 

TGHT will be ramped up to 520A at the rate of 0.1A/min for the full conditioning.

Tuesday, August 13, 2013, 07:51  

Chamber has pumped down to 5.1e-6 Torr. 

Stepping up TGHT to 50A, monitoring pressure... 

Tuesday, August 13, 2013, 08:08  

Vac @ 8.6e-6 Torr and slowly going up. 

Increase TGHT to 80A. 

Tuesday, August 13, 2013, 08:38  

Pressure reached to 6.4e-5 Torr and came down. 

Initiated auto heating.  TGHT max to 520A at 0.1A/min. 

 Monday, August 19, 2013, 10:56

TGHT has reached to max current @ 520A, and heated over the weekend. (See attachment #1)

IG1 currently @ 4.5e-6 Torr, BP @ 33mTorr

Cooling down in progress, rate @ 2A/min.

 Thursday, August 22, 2013, 17:27

Target was removed from the chamber yesterday. 

It looks good and the assembly is underway....

This process is completed.

 Friday, June 01, 2018, 11:20

Target boat was previously coated with TaC and sintered.

Two small C-inserts of ~2cm length were placed on Ta boat

Sample 1-sc: 15 discs of cast 3 made with 1-step cast method (UCx+foil 1.437 g)

Sample 2-sc: 24 discs from rejected discs of 2-step casting (UCx+foil 1.585 g)

Ta boat was wrapped with 3 layers of Ta-heat shield

The chamber is currently pumping down.

TGHT will be ramped up to 495A [same parameters used to reach 1910C in evap2 when sintering TaC coating - elog410 evap2]

Monday, June 04, 2018, 11:27 

IG1 = 4e-7 Torr

Tapped up manually to 35A

Waited 1hr

Vacuum stable.

IG1 = 8.02e-7 Torr.

Initiating auto-ramp (0.1 A/min) up to 80 A

 Tuesday, June 07, 2018, 15:47

Vacuum stable

IG1 = 7.02e-7 Torr.

Changing auto-ramp to 0.02 A/min up to 140 A

Thursday, June 07, 2018, 15:49 

Vacuum stable 5.5e-7 Torr

Current 139 A, voltage 1.25 V

Changing auto-ramp to 0.1 A/min up to 495 

Saturday, June 9, 2018, 10:41 

The material stayed 4 hours at 495 A

Auto-ramp set to -1 A/min down to 0 A 

Monday, June 11, 2018, 17:43 

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

Wednesday, September 14, 2021, 21:14

Boat is wrapped with 2 layers of Ta-heat shield

The samples consists of 15 discs of UCx of 14mm diameter

The chamber is currently pumping down.

TGHT will be ramped up to 450 A

Wednesday, September 15, 2021, 07:17

IGP1 = 6.75e-6 Torr

Tapped up manually to 40A.

TGHT = 60 A, 2.39 V

Vacuum stable IG1 = 7.25e-6 Torr

Initiating auto-ramp for TGHT at a rate of 0.2A/min to 445 A

Parameter setup: 5.0e-5 good vac, 8.0e-5 bad vac.

 Wednesday, September 15, 2021, 11:57

IGP1=2.24e-5 Torr

TGHT= 102.016 A, 1.275 V

Autoramp changed to 1A/min to 450 A

Wednesday, September 15, 2021, 12:53

IGP1 = 3.3e-5 torr

TGHT= 150 A,  V

Autoramp changed to 2A/30s to 450 A

 1e-1 good vac, 5e-1 bad vac

Wednesday, September 15, 2021, 12:59

Friday, September 17, 2021, 07:54

IGP1 = 3.81e-6 Torr

TGHT = 449.6 A, 4.31 V

Autoramp set to -2A/min to 0 A 

Thursday, April 05, 2012, 16:43

Target oven is coated with TaC.  The oven is wrapped with 3 Ta-heat shields.

The chamber is currently being pumped down.  Vac @ high 10e-5 Torr.  Heater will be turned on once the pressure is gone down to low 10e-6. 

TGHT will be heated up to 820A.

**** Sintering is postponed until the situation with the ventilation in the lab06 is cleared. ****

 Friday, May 04, 2012, 16:59

The short-term solution  for improving the ventilation system and for the safety in operating the evaporators has been implement.  The test results was reviewed and approved by the committee.  The labs (06 and 07) are now back in operational. 

Friday, May 04, 2012, 17:03

Pumping down evaporator, currently a 2.4e-5 Torr.

Turned on TGHT, and stepped up to 85A.  Pressure remained at low e-5 Torr. 

Initiated Auto-heating at 0.5A/min to Max current 820A.  Parameter set:  Increasing current if Vac <4.0e-8 Torr, Backing current if Vac >5.0e-8 Torr.

 Monday, May 07, 2012, 10:38

At 820A, the TaC coating only seemed to have partially sinterred.  Raised TGHT up to 900A and heated for >6hrs.  The vacuum continued to increase as the target heater was raised; that indicated the sintering reaction was ongoing.  (See attachment #1: Targetoven_TaCsintered_acrchive.jpg).

The auto-cool down was initiated last night.  TGHT is now at 0A.  The chamber will be vented.

 Tuesday, June 12, 2012, 14:38

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

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.

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.

 Wednesday, March 28, 2018, 11:35

D-shaped discs were cut from cast 2, the same as the last sample of 1stepUCx [see elog i.d. 197]

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

The target consists of 195 discs with 8.1cm in length - all single discs, no packs.

195 x UO2/C discs = 19.79g

Graphite insert is placed inside a target boat with both endcaps on.

Boat previously coated with TaC and sintered.

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

Chamber pumped down overnight.

 Wednesday, March 28, 2018, 13:33

IGP1 = 4.03e-7 Torr

Tapped up TGHT manually to 80A, 0.83V - waited 50min, vacuum started to drop/stabilize.

Continued to tap up manually to 430A, 4.22V

Started out slow with a rate of ~10A/5min, and slowly increased to a rate of ~10A/min as vacuum stabilized, slowing down again when reaching carbonization outgassing.

Auto ramp at 0.2A/min from 430A-520A.

Thursday, March 29, 2018, 10:04

Reached 520A around 2am.

TGHT = 520A, 5.13V

IGP1 = 1.74e-6 Torr

Initiated auto-cool this morning at a rate of 1.0A/min.

Laura Lambert wrote:

Wednesday, March 28, 2018, 11:35 D-shaped discs were cut from cast 2, the same as the last sample of 1stepUCx [see elog i.d. 197] A 13mm punch was used to punch out discs from pre-cut strips using the old method. The target consists of 195 discs with 8.1cm in length - all single discs, no packs. 195 x UO2/C discs = 19.79g Graphite insert is placed inside a target boat with both endcaps on. Boat previously coated with TaC and sintered. Ta-target boat is wrapped with 3-layers of heat shield and installed in evap1 yesterday afternoon. Chamber pumped down overnight.  Wednesday, March 28, 2018, 13:33 IGP1 = 4.03e-7 Torr Tapped up TGHT manually to 80A, 0.83V - waited 50min, vacuum started to drop/stabilize. Continued to tap up manually to 430A, 4.22V Started out slow with a rate of ~10A/5min, and slowly increased to a rate of ~10A/min as vacuum stabilized, slowing down again when reaching carbonization outgassing. Auto ramp at 0.2A/min from 430A-520A. Thursday, March 29, 2018, 10:04 Reached 520A around 2am. TGHT = 520A, 5.13V IGP1 = 1.74e-6 Torr Initiated auto-cool this morning at a rate of 1.0A/min.

 Monday, April 09, 2018, 16:00

ISAC controls performed a PLC switch over compromising the nuclear ventilation controls WITHOUT NOTIFYING ME  

This is the 2nd time in a month this has happened without being notified.

Evap1 has therefore tripped.

During this switch there was a problem which caused the turn over to take even longer.

Sat here tapping reset until nuclear ventilation was 'back on'.

Vacuum proceeded to drop once the tests were complete, then started to spike again, nuc vent remained not ok after tests were done nuc vent ok.

Laura Lambert wrote:

Laura Lambert wrote:  Wednesday, March 28, 2018, 11:35 D-shaped discs were cut from cast 2, the same as the last sample of 1stepUCx [see elog i.d. 197] A 13mm punch was used to punch out discs from pre-cut strips using the old method. The target consists of 195 discs with 8.1cm in length - all single discs, no packs. 195 x UO2/C discs = 19.79g Graphite insert is placed inside a target boat with both endcaps on. Boat previously coated with TaC and sintered. Ta-target boat is wrapped with 3-layers of heat shield and installed in evap1 yesterday afternoon. Chamber pumped down overnight.  Wednesday, March 28, 2018, 13:33 IGP1 = 4.03e-7 Torr Tapped up TGHT manually to 80A, 0.83V - waited 50min, vacuum started to drop/stabilize. Continued to tap up manually to 430A, 4.22V Started out slow with a rate of ~10A/5min, and slowly increased to a rate of ~10A/min as vacuum stabilized, slowing down again when reaching carbonization outgassing. Auto ramp at 0.2A/min from 430A-520A. Thursday, March 29, 2018, 10:04 Reached 520A around 2am. TGHT = 520A, 5.13V IGP1 = 1.74e-6 Torr Initiated auto-cool this morning at a rate of 1.0A/min.    Monday, April 09, 2018, 16:00 ISAC controls performed a PLC switch over compromising the nuclear ventilation controls WITHOUT NOTIFYING ME   This is the 2nd time in a month this has happened without being notified. Evap1 has therefore tripped. During this switch there was a problem which caused the turn over to take even longer. Sat here tapping reset until nuclear ventilation was 'back on'. Vacuum proceeded to drop once the tests were complete, then started to spike again, nuc vent remained not ok after tests were done nuc vent ok.

 Monday, April 09, 2018, 16:52

Turns out I wasn't on a list of ppl who need to know about this test when I should be

They also didn't reset the alarms locally outside the hot lab so nuc vent remained not ok until this was reset.

IGP1 reached 0.027 Torr before nuc vent was ok and pumps were able to be turned back on 

Pumps back on IGP1 = 1.86e-5 Torr and still pumping down

Laura Lambert wrote:

Laura Lambert wrote: Laura Lambert wrote:  Wednesday, March 28, 2018, 11:35 D-shaped discs were cut from cast 2, the same as the last sample of 1stepUCx [see elog i.d. 197] A 13mm punch was used to punch out discs from pre-cut strips using the old method. The target consists of 195 discs with 8.1cm in length - all single discs, no packs. 195 x UO2/C discs = 19.79g Graphite insert is placed inside a target boat with both endcaps on. Boat previously coated with TaC and sintered. Ta-target boat is wrapped with 3-layers of heat shield and installed in evap1 yesterday afternoon. Chamber pumped down overnight.  Wednesday, March 28, 2018, 13:33 IGP1 = 4.03e-7 Torr Tapped up TGHT manually to 80A, 0.83V - waited 50min, vacuum started to drop/stabilize. Continued to tap up manually to 430A, 4.22V Started out slow with a rate of ~10A/5min, and slowly increased to a rate of ~10A/min as vacuum stabilized, slowing down again when reaching carbonization outgassing. Auto ramp at 0.2A/min from 430A-520A. Thursday, March 29, 2018, 10:04 Reached 520A around 2am. TGHT = 520A, 5.13V IGP1 = 1.74e-6 Torr Initiated auto-cool this morning at a rate of 1.0A/min.    Monday, April 09, 2018, 16:00 ISAC controls performed a PLC switch over compromising the nuclear ventilation controls WITHOUT NOTIFYING ME   This is the 2nd time in a month this has happened without being notified. Evap1 has therefore tripped. During this switch there was a problem which caused the turn over to take even longer. Sat here tapping reset until nuclear ventilation was 'back on'. Vacuum proceeded to drop once the tests were complete, then started to spike again, nuc vent remained not ok after tests were done nuc vent ok.    Monday, April 09, 2018, 16:52 Turns out I wasn't on a list of ppl who need to know about this test when I should be They also didn't reset the alarms locally outside the hot lab so nuc vent remained not ok until this was reset. IGP1 reached 0.027 Torr before nuc vent was ok and pumps were able to be turned back on  Pumps back on IGP1 = 1.86e-5 Torr and still pumping down

 Tuesday, April 10, 2018, 14:46

Glove box fixed!

Vented in Argon and transferred to glove box.

Graphite insert has moved to within 1mm of the end of the left side of the boat.

This could have happened during removal from evap1, hard to tell.

Either way, clearly a looser fit of the graphite insert in the boat indicating possible shrinkage of graphite insert.

 Friday, January 19, 2018, 12:29

Circles from cast 1 were used, the same as the last round of 1stepUCx [see elog i.d. 164]

A 14mm punch was used to punch out circles from the cast.

35 circles were packed into a graphite sample container.

35 x UO2/C circles = 5.69 g

Graphite container = 6.84 g

Graphite container 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 currently pumping down.

Marla Cervantes wrote:

Friday, January 19, 2018, 12:29 Circles from cast 1 were used, the same as the last round of 1stepUCx [see elog i.d. 164] A 14mm punch was used to punch out circles from the cast. 35 circles were packed into a graphite sample container. 35 x UO2/C circles = 5.69 g Graphite container = 6.84 g Graphite container 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 currently pumping down.

 Monday, January 22, 2018, 15:48

A power outage on Sunday tripped off EVAP1.

Marla Cervantes wrote:

Marla Cervantes wrote:  Friday, January 19, 2018, 12:29 Circles from cast 1 were used, the same as the last round of 1stepUCx [see elog i.d. 164] A 14mm punch was used to punch out circles from the cast. 35 circles were packed into a graphite sample container. 35 x UO2/C circles = 5.69 g Graphite container = 6.84 g Graphite container 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 currently pumping down.    Monday, January 22, 2018, 9:00 A power outage on Sunday tripped off EVAP1.

 Monday, January 22, 2018, 10:00

Chamber pumping down.

Water flow turned on.

Monday, January 22, 2018, 13:30

IGP1 = 8e-6 Torr

Tapped up entire process manually to 520A in 45 min

TGHT = 520 A, 6.08 V 

Vacuum coming down indicating carbonization process complete

Will remain at max setpoint overnight.

Marla Cervantes wrote:

Marla Cervantes wrote: Marla Cervantes wrote:  Friday, January 19, 2018, 12:29 Circles from cast 1 were used, the same as the last round of 1stepUCx [see elog i.d. 164] A 14mm punch was used to punch out circles from the cast. 35 circles were packed into a graphite sample container. 35 x UO2/C circles = 5.69 g Graphite container = 6.84 g Graphite container 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 currently pumping down.    Monday, January 22, 2018, 9:00 A power outage on Sunday tripped off EVAP1.  Monday, January 22, 2018, 10:00 Chamber pumping down. Water flow turned on. Monday, January 22, 2018, 13:30 IGP1 = 8e-6 Torr Tapped up entire process manually to 520A in 45 min TGHT = 520 A, 6.08 V  Vacuum coming down indicating carbonization process complete Will remain at max setpoint overnight.

 Tuesday, January 23, 2018, 9:30

Initiating auto-cool at 2 A/min

 Tuesday, January 23, 2018, 16:00

 EVAP1 was not vented, Ar tank has low level, Ar tank will be replaced.

Wednesday, January 24, 2018, 11:37

 EVAP1 was vented very carefully using the Ar remaining in the Ar tank.

Ar tank remaining gas: ~8 psi.

Wednesday, January 24, 2018, 15:42 

UCx was transferred to glove box.

Final mass 4.501 g

Marla Cervantes wrote:

Wednesday, January 10, 2018, 14:44 Circles from cast 1 were used, the same as the last round of 1stepUCx [see elog i.d. 164] A 14mm punch was used to punch out circles from the cast. 35 circles were packed into a graphite sample container. 35 x UO2/C circles = 5.75 g Graphite container = 5.38 g Graphite container 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 currently pumping down.

 Friday, January 12, 2018, 07:43

IGP1 = 0.0266 Torr

TGHT = 520A, 5.92V

Voltage has been climbing consistently since it has reached it's max setpoint, gone up ~0.8V in ~18hrs

Carbonization complete.

Initiating auto-cool at 2.0A/min

Will update later with more information on this process.

 Friday, January 12, 2018, 09:47

Turned the turbo pump back on, to ensure safe cooling.

Monday, February 05, 2018, 17:24

35 circles from cast#2 of 14 mm diameter were packed into a graphite sample container.

35 x UO2/C circles = 4.59 g

Graphite container = 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 new Ta foils for heat shielding and the boat was installed in Evap1.

Chamber currently pumping down.

 Tuesday, February 06, 2018, 10:59

Initial IGP1 = 4.79e-7 Torr

Tapped up entire process manually to 520A in 30 min

TGHT = 520 A, 5.32 V

Vacuum coming down indicating carbonization process complete.  

Will remain at max setpoint for 4 hrs to ensure full carbonization before cooling down.

 Tuesday, February 06, 2018, 14:44

Initiating auto-cool at 2.0 A/min 

 Thursday, February 08, 2018, 10:43

Vented with Ar and removed from EVAP1

 Thursday, February 01, 2018, 12:59

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

28 discs corresponded to cats#1 and 7 discs to cast#2

35 x UO2/C circles = 3.42 g

Graphite container = 6.96 g

Graphite tube is placed inside a target boat.

Boat previously coated with TaC and sintered.

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

Chamber currently pumping down.

 Friday, February 02, 2018, 13:18

Initial IGP1 = 4.82x10e-7 Torr

Tapped up entire process manually to 520A in 30 min

TGHT = 520 A, 5.63 V

Vacuum coming down nicely indicating carbonization process complete 

Will remain at max setpoint for 4 hrs to ensure full carbonization before cooling down.

 Friday, February 02, 2018, 16:57

Initiating auto-cool at 2.0 A/min 

Monday, February 05, 2018, 17:23