John Wong wrote:

Thursday, May 30, 2013, 16:16 The target container was previously coated with TaC and sintered in Evap 2. The target is loaded with 250 discs of UCx (material from batch#03_02042013) Total length = 8.9cm 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 to the ionizer tube pointing out of the page.  The right end is open with no cap.  (Did not use a D-cap... trying out this method.  Need to be careful when handling the target!) The chamber is dumping 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, 6.0-5 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 vavle when it is completely vented. 15.  Remove the target from the chamber and put in the "orange box" and transport to the Ar-glove box. Done!  Friday, May 31, 2013, 18:17 Chamber has pumped down to 6.7e-6 Torr.  Ramping up TGHT to 175A.  Wednesday, June 05, 2013, 11:14 TGHT reached to 227A/1.99V. (see attachment#1) TGHT is ramping down to 0A  to clean up the chamber before continue with the conditioning.

 Wednesday, June 05, 2013, 16:45

Glove box purged with Ar, ~30min

Chamber vented with Ar

Target removed. chamber cleaned with TCE.

Chamber pumped back down

IG1 currently at 1.4E-4 torr

See attachment 1 before chamber was cleaned

Thursday, June 06, 2013, 11:38

Chamber has been pumped down overnight

IG1 currently at 4.7E-06 Torr, BP at 30 mTorr

TGHT will be ramped up to 220A at 1A/min

Laura Lambert wrote:

John Wong wrote: Thursday, May 30, 2013, 16:16 The target container was previously coated with TaC and sintered in Evap 2. The target is loaded with 250 discs of UCx (material from batch#03_02042013) Total length = 8.9cm 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 to the ionizer tube pointing out of the page.  The right end is open with no cap.  (Did not use a D-cap... trying out this method.  Need to be careful when handling the target!) The chamber is dumping 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, 6.0-5 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 vavle when it is completely vented. 15.  Remove the target from the chamber and put in the "orange box" and transport to the Ar-glove box. Done!  Friday, May 31, 2013, 18:17 Chamber has pumped down to 6.7e-6 Torr.  Ramping up TGHT to 175A.  Wednesday, June 05, 2013, 11:14 TGHT reached to 227A/1.99V. (see attachment#1) TGHT is ramping down to 0A  to clean up the chamber before continue with the conditioning.      Wednesday, June 05, 2013, 16:45 Glove box purged with Ar, ~30min Chamber vented with Ar Target removed. chamber cleaned with TCE. Chamber pumped back down IG1 currently at 1.4E-4 torr See attachment 1 before chamber was cleaned     Thursday, June 06, 2013, 11:38 Chamber has been pumped down overnight IG1 currently at 4.7E-06 Torr, BP at 30 mTorr TGHT will be ramped up to 220A at 1A/min

 Thursday, June 06, 2013, 16:53

TGHT has reached to 220A; continue ramping up to 520A at 0.1A/min rate.

 Monday, June 10, 2013, 12:28

TGHT has reached to 520A; target has been heated at the current over the weekend.

IG is stabilizing at 3.7e-6 Torr. 

Initiating auto-cooling to 0A at 2A/min.

Chamber will be vented in Ar tomorrow.

 Monday, June 10, 2013, 17:50

TGHT reached to 0A. See attachment #1 for the overall process. 

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, October 11, 2013, 18:00

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

The target is loaded with ??? discs of UCx (material from batch #???)

Total length = ???

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.

Wednesday, April 30, 2014, 14:50

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

The target is loaded with 250 discs of UCx (material from batch#09_06022014)

Total length = 9.3cm

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 to the ionizer tube pointing out of the page, so the right end is open with no cap to allow out-gassing.

(Did not use a D-cap... This worked for UCx#8. Need to be careful when handling the target!)

The chamber is being dumping down.

TGHT will be ramped up to 520A - keep heating at that current for ~4 to 5 hours.

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

 Wednesday, April 30, 2014, 16:41

Vacuum at 1.5 e-5 Torr.  Stepped up TGHT to 25A.

 Wednesday, April 30, 2014, 17:42

Pressure 9.2 e-6 Torr.  Initiate auto-heating.

 Friday, May 16, 2014, 16:02

Conditioning complete. (see attachment)

End-caps need to be expended before assembly.

Tuesday, May 20, 2014, 16:01

Target boat contains one pellet of carbon mesh coated with UC2.  The sample was prepared in the Ar-glove box and the container is wrapped with 2 layer of Ta foil (it wasn't easy to do the wrapping).

Chamber is currently being pumped down.

TGHT will be heated up to 600A. 

Wednesday, May 21, 2014, 11:40

Chamber has been pumped down overnight, vac @ 6.7e-6 Torr.

Tuesday, May 27, 2014, 10:51 

TGHT was heated up to 600A and stayed for 12hrs before cooled down (see attachment).

EDX/SEM/XRD will be done soon...

More information about this sample structure can be found here: https://www.dropbox.com/sh/hirm808pgjwzg71/AAB1-kP399IbIa8AGdI-OMGua

 Friday, June 13, 2014, 14:57

Chamber was vented and cleaned for UCx target production. 

Will re-visit this later...

Friday, June 13, 2014, 15:02

Target container was previously coated and sintered with TaC.  It's wrapped with 3-layers of Ta heat shield, including the center block.

The target consists of 280 discs of UCx with 9cm in length.

A regular TaC coated/sintered endcap is inserted on right, wrt to the ionizer tube pointing down, so the left end is open with no cap to allow out-gassing.

The chamber is being dumping down.

TGHT will be ramped up to 520A - keep heating at that current for ~4 to 5 hours.

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

 Friday, June 13, 2014, 16:26

Pressure at 1.9e-5 Torr. 

Initiate auto-ramping- stepping up from 0A at 0.1A/min - leaving for the weekend.

 Wednesday, June 25, 2014, 11:45

TGHT has reached 520A and target has been conditioned at that current for 13hrs. 

Auto-cooling initiated at 2A/min.

Once the target is cooled, the chamber will be vented in Ar.

 Friday, July 04, 2014, 10:06

Process is complete.  Target is stored in the Ar-glove box and ready for assembly.

 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.

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.

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)

Friday, March 20, 2015, 15:17 

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 225 discs of UCx with 9.2cm in length.

Packing step was skipped for first time, loaded singular discs into target container, no binder holding discs together.

A regular TaC coated endcap is inserted left, wrt the ionizer tube pointing down, so the right is open.

The chamber is currently pumping down.

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.

 Monday, March 23, 2015, 09:09

IOC has been rebooted.

Ion gauge won't turn on - goes into drive, then times out...

 Monday, March 23, 2015, 15:06

Both filaments in IG1 are burnt out.

EVAP1 will be vented tomorrow morning.

UCx will be placed in the pelican case under argon while the filaments are being replaced in the morning.

 Tuesday, March 24, 2015, 11:27

Vented in argon and placed target in pelican case.

Ion gauge replaced this morning.

Continued purging evap1 and re-installed UCx back into evap1.

Currently pumping back down.

 Wednesday, March 25, 2015, 09:38

IG1 = 8.65e-7 Torr

Tapped up evap1 manually to 40A.

Waited ~20min.

Vaccuum stable.

IGP1 = 7.75e-7 Torr.

Initiating auto-ramp.

 Wednesday, April 01, 2015, 15:07

TGHT has reached 520A, 5.82V - YAY!

Will continue to heat overnight and initiate ramp-down/ cooling tomorrow morning.

Slightly shorter time frame to reach max setpoints than normal - possibly due to lack of binder/ skipping packing process.

Great timing before the long weekend 

 Thursday, April 02, 2015, 09:20

Target has been conditioned at max setpoints for 20hours.

Auto-cooling ramp down initiated at 2.0A/min.

 Thursday, April 09, 2015, 16:02

Vented in argon and removed from evap1 tuesday.

Appears as though some discs may be slightly displaced, pictures to follow...

 Tuesday, June 30, 2015, 13:28

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 221 discs of UCx with 7.3cm in length.

A regular TaC coated endcap is inserted left, wrt the ionizer tube pointing down, so the right is open - discs are held on with Ta wire spring.

The chamber is currently pumping down.

TGHT will be ramped up to 520A at 0.1A/min

Parameter setup: 5.0e-5 good vac, 6.0e-5 bad vac.

 Tuesday, June 30, 2015, 14:43

IG1 = 1.8e-5 Torr.

Tapped up manually to 30A.

Vacuum stable; IG1 = 1.2e-5 Torr.

Initiating auto-ramp.

 Thursday, July 02, 2015, 08:41

EVAP1 was tripped off due to backflow preventer test this morning.

IG1 - 4.2e-6 Torr.

Tapping back-up manually before re-initiating auto-ramp.

 Thursday, July 02, 2015, 11:49

Tapped up manually to 85A, 0.65V

IG1 = 3.6e-6 Torr.

Initiating auto-ramp.

 Friday, July 03, 2015, 14:47

All water valves look good, flow is good.

WV turned back on, TGHT turned back on. 

Tapped back up manually to 20A.

IG1 = 2.3e-6 Torr

Initiating auto-ramp at 0.1A/min with a max setpoint of 150A over the weekend.

Will continue to ramp up monday.

Approved by Peter Kunz.

Laura Lambert wrote:

Tuesday, June 30, 2015, 13:28 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 221 discs of UCx with 7.3cm in length. A regular TaC coated endcap is inserted left, wrt the ionizer tube pointing down, so the right is open - discs are held on with Ta wire spring. The chamber is currently pumping down. TGHT will be ramped up to 520A at 0.1A/min Parameter setup: 5.0e-5 good vac, 6.0e-5 bad vac.  Tuesday, June 30, 2015, 14:43 IG1 = 1.8e-5 Torr. Tapped up manually to 30A. Vacuum stable; IG1 = 1.2e-5 Torr. Initiating auto-ramp.  Thursday, July 02, 2015, 08:41 EVAP1 was tripped off due to backflow preventer test this morning. IG1 - 4.2e-6 Torr. Tapping back-up manually before re-initiating auto-ramp.  Thursday, July 02, 2015, 11:49 Tapped up manually to 85A, 0.65V IG1 = 3.6e-6 Torr. Initiating auto-ramp.

 Thursday, July 02, 2015, 12:58

NOTE:  Before venting the EVAP1 chamber, the Ar line must disconnect from Peter's sampling chamber (inside the fumehood) and connect back to the EVAP. 

John Wong wrote:

Laura Lambert wrote:  Tuesday, June 30, 2015, 13:28 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 221 discs of UCx with 7.3cm in length. A regular TaC coated endcap is inserted left, wrt the ionizer tube pointing down, so the right is open - discs are held on with Ta wire spring. The chamber is currently pumping down. TGHT will be ramped up to 520A at 0.1A/min Parameter setup: 5.0e-5 good vac, 6.0e-5 bad vac.  Tuesday, June 30, 2015, 14:43 IG1 = 1.8e-5 Torr. Tapped up manually to 30A. Vacuum stable; IG1 = 1.2e-5 Torr. Initiating auto-ramp.  Thursday, July 02, 2015, 08:41 EVAP1 was tripped off due to backflow preventer test this morning. IG1 - 4.2e-6 Torr. Tapping back-up manually before re-initiating auto-ramp.  Thursday, July 02, 2015, 11:49 Tapped up manually to 85A, 0.65V IG1 = 3.6e-6 Torr. Initiating auto-ramp.    Thursday, July 02, 2015, 12:58 NOTE:  Before venting the EVAP1 chamber, the Ar line must disconnect from Peter's sampling chamber (inside the fumehood) and connect back to the EVAP.

 Friday, July 03, 2015, 13:42

water valve tripped off at ~1pm, which subsequently tripped off the TGHT [see photo]

currently trying to figure out what caused this to occur before re-starting....

 Friday, July 03, 2015, 14:47

All water valves look good, flow is good.

WV turned back on, TGHT turned back on. 

Tapped back up manually to 20A.

IG1 = 2.3e-6 Torr

Initiating auto-ramp at 0.1A/min with a max setpoint of 150A over the weekend.

Will continue to ramp up monday.

Approved by Peter Kunz.

 Monday, July 06, 2015, 09:29

TGHT reached 150A 1.5hrs ago.

Vacuum stable.

IG1 = 2.7e-5 Torr.

Re-starting auto-ramp at 0.1A/min with a max setpoint of 520A.

Laura Lambert wrote:

John Wong wrote: Laura Lambert wrote:  Tuesday, June 30, 2015, 13:28 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 221 discs of UCx with 7.5cm in length. A regular TaC coated endcap is inserted left, wrt the ionizer tube pointing down, so the right is open - discs are held on with Ta wire spring. The chamber is currently pumping down. TGHT will be ramped up to 520A at 0.1A/min Parameter setup: 5.0e-5 good vac, 6.0e-5 bad vac.  Tuesday, June 30, 2015, 14:43 IG1 = 1.8e-5 Torr. Tapped up manually to 30A. Vacuum stable; IG1 = 1.2e-5 Torr. Initiating auto-ramp.  Thursday, July 02, 2015, 08:41 EVAP1 was tripped off due to backflow preventer test this morning. IG1 - 4.2e-6 Torr. Tapping back-up manually before re-initiating auto-ramp.  Thursday, July 02, 2015, 11:49 Tapped up manually to 85A, 0.65V IG1 = 3.6e-6 Torr. Initiating auto-ramp.    Thursday, July 02, 2015, 12:58 NOTE:  Before venting the EVAP1 chamber, the Ar line must disconnect from Peter's sampling chamber (inside the fumehood) and connect back to the EVAP.     Friday, July 03, 2015, 13:42 water valve tripped off at ~1pm, which subsequently tripped off the TGHT [see photo] currently trying to figure out what caused this to occur before re-starting....  Friday, July 03, 2015, 14:47 All water valves look good, flow is good. WV turned back on, TGHT turned back on.  Tapped back up manually to 20A. IG1 = 2.3e-6 Torr Initiating auto-ramp at 0.1A/min with a max setpoint of 150A over the weekend. Will continue to ramp up monday.   Approved by Peter Kunz.  Monday, July 06, 2015, 09:29 TGHT reached 150A 1.5hrs ago. Vacuum stable. IG1 = 2.7e-5 Torr. Re-starting auto-ramp at 0.1A/min with a max setpoint of 520A.

 Wednesday, July 08, 2015, 10:44

The carbonization process is complete; chamber vacuum is stabilizing at 9.5e-6 Torr. 

Currently TGHT is at 430A.  Increased TGHT ramping rate to 1A/min.  Target should be at max current (520A) in 1.5 hours, so TGHT can be ramped down around 4:30pm today. 

 Wednesday, July 08, 2015, 16:36

TGHT at 520A/5.884V for over 4 hours.  Pressure coming down, currently at 1.42e-5 Torr. 

Initiated cooling at -2A/min. 

Chamber can be vented in Ar tomorrow and the target will be inspected.

Thursday, July 09, 2015, 17:08  

The target was taken out from the evaporator and inspected. 

Some "burnt" marks on the ionization legs can be observed and also the centre support leg is bent.  (see photos#1)

Not sure if the centre leg came in bent after machining or it happened during the carbonization process??  Do not have photos of the container before the process to compare.  

A few things to note…  During the process, the power supply did tripped off twice due to the cooling water valve shut off. (see photo#2).  An assumption is that sudden cool down of the hot target might have caused the quenching effect. 

No other visible damage.  

End caps are inserted and ready for assembly.

Link to photos:  https://www.dropbox.com/sh/c1ake0fu4x7lckc/AAD0F8TVRrpCbbHquEvSkyYIa?dl=0

Thursday, October 15, 2015, 15:52

Target container previously sintered with TaC in Evap#2 - Target current at 440A, temp measured at 1900C.  A few tests on the temp measured were done (see Evap#2 elog #251 & 252). 
Note:  This is the new design container with a small back block.

Container is loaded with 245 discs of UC2; measured disc length 7.5 cm

A regular TaC coated endcap is inserted left, wrt the ionizer tube pointing down, so the right is open - discs are held on with Ta wire spring.

3 layers of Ta-heat shield is used. 

Target heater will be ramped up to 440A (according to the achieved temperature from Evap#2). 

Ramping rate at 0.1A/min.

Monitor closely on the vacuum around 400A to see if the carbonization process is complete. 

Chamber is currently being pumped down. 

 Friday, October 16, 2015, 10:33

Chamber has pumped down to 2e-6 Torr. 

Stepping up TGHT to 70A/0.23V. 

 Friday, October 16, 2015, 14:55

TGHT stepped up to 70A, pressure went to max 5.7e-5 Torr and it's coming down.

Initated autoramping.  (good vac at 5e-5 Torr, bad at 6.0e-5 Torr)

 Thursday, October 22, 2015, 12:26

TGHT has reached 440A/4.403V and stablized for about 5 hours. 

Pressure started coming down at around 370A which indicated the ending of the carbonization process. 

Currently vacuum is at 5.6e-6 torr. 

Initiated cooling down process at 2A/min.

John Wong wrote:

Thursday, October 15, 2015, 15:52 Target container previously sintered with TaC in Evap#2 - Target current at 440A, temp measured at 1900C.  A few tests on the temp measured were done (see Evap#2 elog #251 & 252).  Note:  This is the new design container with a small back block. Container is loaded with 245 discs of UC2; measured disc length 7.5 cm A regular TaC coated endcap is inserted left, wrt the ionizer tube pointing down, so the right is open - discs are held on with Ta wire spring. 3 layers of Ta-heat shield is used.  Target heater will be ramped up to 440A (according to the achieved temperature from Evap#2).  Ramping rate at 0.1A/min. Monitor closely on the vacuum around 400A to see if the carbonization process is complete.  Chamber is currently being pumped down.   Friday, October 16, 2015, 10:33 Chamber has pumped down to 2e-6 Torr.  Stepping up TGHT to 70A/0.23V.   Friday, October 16, 2015, 14:55 TGHT stepped up to 70A, pressure went to max 5.7e-5 Torr and it's coming down. Initated autoramping.  (good vac at 5e-5 Torr, bad at 6.0e-5 Torr)  Thursday, October 22, 2015, 12:26 TGHT has reached 440A/4.403V and stablized for about 5 hours.  Pressure started coming down at around 370A which indicated the ending of the carbonization process.  Currently vacuum is at 5.6e-6 torr.  Initiated cooling down process at 2A/min.

 Monday, October 26, 2015, 16:18

Target vented in argon, taken out and currently in glove box.

Target looks good, last one of the year! 

Endcaps inserted and need to be expanded, Rh foil still needs to be added.

 Thursday, February 18, 2016, 15:34

Target container was previously coated with TaC spray and sintered.

Container is wrapped with 3 layers of Ta-heat shield, including the center block - same method as for sintering TaC coating [new wrapping method-see elog112 eva2].

The target consists of 244 discs of UCx with 7.8cm in length.

A regular TaC coated endcap is inserted left, wrt the ionizer tube pointing down, so the right is open

The chamber is currently pumping down.

TGHT will be ramped up to 520A at 0.1A/min

Parameter setup: 5.0e-5 good vac, 6.0e-5 bad vac.

 Friday, February 19, 2016, 08:28

IG1 = 4.7e-6 Torr

Tapped up manually to 35A.

Waited ~1hr, vacuum stable

IG1 = 3.8e-6 Torr.

Initiating auto-ramp.

Laura Lambert wrote:

Thursday, February 18, 2016, 15:34 Target container was previously coated with TaC spray and sintered. Container is wrapped with 3 layers of Ta-heat shield, including the center block - same method as for sintering TaC coating [new wrapping method-see elog112 eva2]. The target consists of 244 discs of UCx with 7.8cm in length. A regular TaC coated endcap is inserted left, wrt the ionizer tube pointing down, so the right is open The chamber is currently pumping down. TGHT will be ramped up to 520A at 0.1A/min Parameter setup: 5.0e-5 good vac, 6.0e-5 bad vac.  Friday, February 19, 2016, 08:28 IG1 = 4.7e-6 Torr Tapped up manually to 35A. Waited ~1hr, vacuum stable IG1 = 3.8e-6 Torr. Initiating auto-ramp.

 Friday, February 26, 2016, 10:26

Target has been heated at 520A for 10 hrs.

Vacuum at 5.3e-6 Torr. 

Initiated cool down at 1A/min. 

Remember to vent with Ar.