Laura Lambert wrote:

John Wong wrote: Laura Lambert wrote:  Tuesday, June 09, 2015, 9:16 Target container is coated with TaC. No Ta-heat shields are used. TGHT will be ramped up to 580A at 0.2A/min. TBHT will be ramped up to 230A at 01A/min. Chamber is currently being pumped down.  Tuesday, June 09, 2015, 15:37 HS water valves were opened. no leaks detected. Tapped up manually to 35A. Once vacuum stabilized after ~45min, initiated auto-ramp.  Wednesday, June 10, 2015, 08:02 IGP1 = 5.3e-7 Torr. TGHT = 250A and TBHT = 140A. Increasing auto ramp to 2.0A/min and 1.0A/min for the TGHT and TBHT respectively.    Wednesday, June 10, 2015, 16:32 TGHT/TBHT are at 580A/230A for almost 6 hours, temp at 1728C. Vac at 8.5e-7 Torr.  Cooling down initiated at 1A/min. Target container should be inspected once the chamber is vented.    Thursday, June 11, 2015, 10:55 Vented in air and opened up this morning. Same as last container sintered in evap2 [IG-LIS for UCx#13] - ends not quite fully sintered and coating not very good. most likely due to old TaC spray. See link for photos. https://www.dropbox.com/sh/75o43x8y2z16e7j/AABc8Z1fTTaTRtJ5_Jr1eacWa?dl=0

 Monday, June 15, 2015, 15:24

Same problem also found for the LP-IG-LIS container, WO#40860-1, see elog id#215.  After re-coating and sintering, it seems better. 

For this container, it is re-coated and will undergo the sintering process one more time. 

Will try to go up to 1900C for the sintering process.

Target container is temporarily wrapped with 6.2cm of Ta foil as a layer for heat shield on each side of the tube, excluding the centre block.  The shield will be removed once the process is done.  

Target current will be controlled accordingly. 

Chamber is being pumped down. 

 Monday, June 15, 2015, 16:17

HS water valves open; no leaks detected. 

IGP1 at 6.8e-6 Torr and coming down.

 Monday, June 15, 2015, 17:21

Stepping up TGHT/TBHT to 60A, pressure seems pretty stable at 7.2e-6 Torr and coming down. 

Setting TGHT to 400A and TBHT to 230A, auto-ramping initiated.   Will setup up current to reach 1900C, if necessary. 

 Monday, June 15, 2015, 20:28

TGHT and TBHT reached 400A/230A, Temp at 1552C.  Vac at 2.7e-6 Torr.

Stepping TGHT

Monday, June 15, 2015, 21:16  

TGHT at 520A/9.06 V to achieve 1900C.  DV at 5.09V.  

Vac at 4.2e-6 Torr.  

Will continue the sintering process at this temperature for another 3-4 hours. 

 Tuesday, June 16, 2015, 00:15

Target container has been heated at 1900C for over 3 hours.  

Vacuum is coming down to 1.4e-6 Torr.  

Initiated cooling process at 2A/min

Chamber can be vented tomorrow and container should be inspected

 Friday, June 26, 2015, 16:04

Container looks good!

 Thursday, June 25, 2015, 16:14

Total number of foils: 422 discs

Total mass of materials [incl graphite foils]: 

Total length packed: 12.0cm

Container has one Ta heat shield.

No endcaps inserted to allow outgassing

Two TaC coated Ta wires formed into a spring inserted either end to avoid ZrC expansion of materials.

Currently being pumped down.

 Friday, June 26, 2015, 11:44

HS water valves opened.

No leaks detected.

Initiating ramp up.

 Friday, June 26, 2015, 14:44

EVAP2 was tapped up manually to 50A.

Vacuum tripped evap off.

Tapping back up manually now...

 Friday, June 26, 2015, 15:53

Tapped up manually to 45A for both TGHT and TBHT

IGP1 = 4.8e-5 Torr

Will initiate auto-ramp at 0.2A/min and 0.1A/min for the TGHT and TBHT respectively once vacuum settled down and stable.

Max setpoints set to 520A and 230A for the TGHT and TBHT respectively.

Good Vacuum = 3.0e-5 Torr. Bad Vacuum = 4.0e-5 Torr.

Laura Lambert wrote:

Thursday, June 25, 2015, 16:14 Total number of foils: 422 discs Total mass of materials [incl graphite foils]:  Total length packed: 13.2cm Container has one Ta heat shield. No endcaps inserted to allow outgassing Two TaC coated Ta wires formed into a spring inserted either end to avoid ZrC expansion of materials. Currently being pumped down.  Friday, June 26, 2015, 11:44 HS water valves opened. No leaks detected. Initiating ramp up.  Friday, June 26, 2015, 14:44 EVAP2 was tapped up manually to 50A. Vacuum tripped evap off. Tapping back up manually now...  Friday, June 26, 2015, 15:53 Tapped up manually to 45A for both TGHT and TBHT IGP1 = 4.8e-5 Torr Will initiate auto-ramp at 0.2A/min and 0.1A/min for the TGHT and TBHT respectively once vacuum settled down and stable. Max setpoints set to 520A and 230A for the TGHT and TBHT respectively. Good Vacuum = 3.0e-5 Torr. Bad Vacuum = 4.0e-5 Torr.

 Monday, June 29, 2015, 06:57

TGHT has been at 520A/9.80V, DV 5.80V for 7 hours, temperature measured at 1800C.  Vac is coming down to 9.18e-6 Torr.  However, TGHT voltage is slightly going up over the 7 hours of heating, See screenshot attachment. (Can't make further comments until target is inspected.)

Initiated cooling down at 2A/min for TGHT and 1A/min for TBHT.

Chamber can be vented later today.

 Monday, June 29, 2015, 14:58

Target has been inspected.

Slightly crystallization on the outer tube of the container can be observed. 

Overall, the container looks a lot better than before. 

Rn foiled inserted. Salt added - Ready for test-stand

 Monday, June 29, 2015, 16:17

Target container is coated with TaC. No Ta-heat shields are used.

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

TBHT will be ramped up to 230A at 01A/min.

Chamber is currently being pumped down.

Laura Lambert wrote:

Monday, June 29, 2015, 16:17 Target container is coated with TaC. No Ta-heat shields are used. TGHT will be ramped up to 580A at 0.2A/min. TBHT will be ramped up to 230A at 01A/min. Chamber is currently being pumped down.

 Monday, June 29, 2015, 23:37

Opened the HS valves around 5pm.  Small leaks or just a vibration in the pipe line caused a rise in vacuum.  Leak rate is small, so allow the chamber to continue to pump down over night.

Sintering process can begin tomorrow if vacuum is allowed.

John Wong wrote:

Laura Lambert wrote:  Monday, June 29, 2015, 16:17 Target container is coated with TaC. No Ta-heat shields are used. TGHT will be ramped up to 580A at 0.2A/min. TBHT will be ramped up to 230A at 01A/min. Chamber is currently being pumped down.    Monday, June 29, 2015, 23:37 Opened the HS valves around 5pm.  Small leaks or just a vibration in the pipe line caused a rise in vacuum.  Leak rate is small, so allow the chamber to continue to pump down over night. Sintering process can begin tomorrow if vacuum is allowed.

 Tuesday, June 30, 2015, 08:22

IGP1 = 3.6e-7 Torr.

Tapped up manually to 40A.

Vacuum looks good.

IGP1 = 6.9e-7 Torr.

Inititating auto-ramp...

 Thursday, July 02, 2015, 09:56

IGP1 = 8.9e-7 Torr.

OMEGA = 1728C

TGHT and TBHT = 580A and 230A respectively.

Tapping up manually to 1800C.

 Thursday, July 02, 2015, 11:02

TGHT = 615A, 10.9V

OMEGA = 1800C

IGP1 = 1.1e-6 Torr.

Will continue to heat for 4hrs.

 Thursday, July 02, 2015, 15:43

Target container remained at 1800C for 4hrs50min.

Initiating auto-cool for TGHT = 2A/min and TBHT = 1A/min.

 Friday, July 03, 2015, 08:24

Vented in air and opened up this morning.

Edge of container on both ends not fully sintered [see photos]

Laura Lambert wrote:

John Wong wrote: Laura Lambert wrote:  Monday, June 29, 2015, 16:17 Target container is coated with TaC. No Ta-heat shields are used. TGHT will be ramped up to 580A at 0.2A/min. TBHT will be ramped up to 230A at 01A/min. Chamber is currently being pumped down.    Monday, June 29, 2015, 23:37 Opened the HS valves around 5pm.  Small leaks or just a vibration in the pipe line caused a rise in vacuum.  Leak rate is small, so allow the chamber to continue to pump down over night. Sintering process can begin tomorrow if vacuum is allowed.    Tuesday, June 30, 2015, 08:22 IGP1 = 3.6e-7 Torr. Tapped up manually to 40A. Vacuum looks good. IGP1 = 6.9e-7 Torr. Inititating auto-ramp...  Thursday, July 02, 2015, 09:56 IGP1 = 8.9e-7 Torr. OMEGA = 1728C TGHT and TBHT = 580A and 230A respectively. Tapping up manually to 1800C.  Thursday, July 02, 2015, 11:02 TGHT = 615A, 10.9V OMEGA = 1800C IGP1 = 1.1e-6 Torr. Will continue to heat for 4hrs.  Thursday, July 02, 2015, 15:43 Target container remained at 1800C for 4hrs50min. Initiating auto-cool for TGHT = 2A/min and TBHT = 1A/min.  Friday, July 03, 2015, 08:24 Vented in air and opened up this morning. Edge of container on both ends not fully sintered [see photos]

 Monday, July 06, 2015, 11:54

Inner tube surface isn't homogeneously sintered with TaC (see attachment).  

A second coating may help.  

For the re-sintering process, the target container will be wrapped with 6.2cm Ta (width) foil as a layer for heat shield on each side of the tube,  excluding the centre block - just like the same process was done last time, see e-log ID#217.  

The Ta-foil and the target tube will be spaced with Ta wire coiled around it.  

TGHT can be ramped up about 520A/9.1V to achieve 1900C.  Heating time for 3-4 hours until vacuum comes down to low 10-6 Torr. 

John Wong wrote:

Laura Lambert wrote: John Wong wrote: Laura Lambert wrote:  Monday, June 29, 2015, 16:17 Target container is coated with TaC. No Ta-heat shields are used. TGHT will be ramped up to 580A at 0.2A/min. TBHT will be ramped up to 230A at 01A/min. Chamber is currently being pumped down.    Monday, June 29, 2015, 23:37 Opened the HS valves around 5pm.  Small leaks or just a vibration in the pipe line caused a rise in vacuum.  Leak rate is small, so allow the chamber to continue to pump down over night. Sintering process can begin tomorrow if vacuum is allowed.    Tuesday, June 30, 2015, 08:22 IGP1 = 3.6e-7 Torr. Tapped up manually to 40A. Vacuum looks good. IGP1 = 6.9e-7 Torr. Inititating auto-ramp...  Thursday, July 02, 2015, 09:56 IGP1 = 8.9e-7 Torr. OMEGA = 1728C TGHT and TBHT = 580A and 230A respectively. Tapping up manually to 1800C.  Thursday, July 02, 2015, 11:02 TGHT = 615A, 10.9V OMEGA = 1800C IGP1 = 1.1e-6 Torr. Will continue to heat for 4hrs.  Thursday, July 02, 2015, 15:43 Target container remained at 1800C for 4hrs50min. Initiating auto-cool for TGHT = 2A/min and TBHT = 1A/min.  Friday, July 03, 2015, 08:24 Vented in air and opened up this morning. Edge of container on both ends not fully sintered [see photos]    Monday, July 06, 2015, 11:54 Inner tube surface isn't homogeneously sintered with TaC (see attachment).   A second coating may help.   For the re-sintering process, the target container will be wrapped with 6.2cm Ta (width) foil as a layer for heat shield on each side of the tube,  excluding the centre block - just like the same process was done last time, see e-log ID#217.   The Ta-foil and the target tube will be spaced with Ta wire coiled around it.   TGHT can be ramped up about 520A/9.1V to achieve 1900C.  Heating time for 3-4 hours until vacuum comes down to low 10-6 Torr.

 Monday, July 06, 2015, 16:28

Container has been re-coated with TaC.

Target container is wrapped with a single 15.5cm x 8.5cm Ta foil heat shield on each side of the center block, spaced with Ta wire coil.

Chamber is currently being pumped down.

 Tuesday, July 07, 2015, 09:36

HS water valves were opened this morning, no leaks detected.

IGP1 = 6e-7 Torr.

Tapped up manually to 30A.

Waited ~1hr.

Vacuum stable, IGP1 = 1.9e-6 Torr.

Initiating auto-ramp at 0.2A/min and 0.1A/min for TGHT and TBHT respectively.

 Target container reached max setpoints of 520A/230A and 1950C ~6hrs ago.

IGP1 = 7.6e-7 Torr.

Initiating auto-cool at 2.0A/min and 1.0A/min for the TGHT and TBHT respectively.

 Friday, July 10, 2015, 11:16

Vented in air and removed from evap2.

Again, edges not fully sintered [see photos]

Inside of container looks better, fully coated.

Laura Lambert wrote:

Thursday, September 24, 2015, 08:39 IGP1 = 6.5e-7Torr HS water valves opened, no leaks detected. Tapped up manually to 35A. Waited ~20min. Vacuum stable, IGP1 = 1.5e-6 Torr. Initiated auto-ramp at 0.2A/min and 0.1A/min for the TGHT and TBHT respectively with final setpoints of 250A and 230A. Final temp of 1200C on auto-ramp in order to initiate temperature measurements starting at ~1200C. Thursday, September 24, 2015, 10:24   IGP1 = 8.7e-7 Torr TGHT = 44A, TBHT = 38A Increasing auto-ramp to 0.5A/min and 0.2A/min for the TGHT and TBHT respectively.

 Thursday, September 24, 2015, 12:04

 A few notes about the target container:The Ta-foil is cut in a full length of the target container, and that also covers up the back block, and the container is wrapped with 3 sheets (see attachment)

 The inner tube is coated with TaC, using the "flushing technique" - the coating looks much better; will see how it turns out after the sintering process

The target will be heated up to 1900C .  Due to the new wrapping of the Ta-heat shield, the heat distribution may be different.  So the target heater will be ramped up to achieve the desired temperature.  

Thursday, September 24, 2015, 18:45  

TGHT reached to 250A3.6V, TGHT at 230A and stayed for 1.5 hours.  Temp-L = 1280C, Temp-R = 1360C.  

Auto-ramp TGHT to 500A at 1A/min and heat at that current for overnight.  Will take temp reading tomorrow.  

Thursday, September 24, 2015, 23:08  

TGHT has reached to 500A/8.57V.  Temp-L = 1895C, Temp-R = 2073C. (Not sure why the temperature is real, will need to investigate more to get an absolute temp)

Just to be safe… Ramping down TGHT to 425A (according to e-log id 216, Temp-R reached to 1800C with TGHT at 425A/6.84V, but no temp measured for the left at that time)

Will check again later.

Friday, September 25, 2015, 11:52  

The target has been heated at 420A for ~12hours; temp measured ~1900C, slightly higher than the previous target container (W.O#40860-1); the Ta-wraping could affect the heat distribution.  

The temperature is also confirmed by using the 2-C digital pyrometer.  The tube inner surface is measured about 1900C, and the ionizer tube is about 2400C.  (see attachment #2).

Initiating auto-cooling at 2A/min for TGHT and 1A/min for TBHT.

The target will be inspected next Monday

 Wednesday, September 30, 2015, 16:01

The target container is fully sintered (see attachment#3) 

It is still in the discussion where this container will be used online for the UCx.  Nevertheless, the target contain is ready and it looks pretty good. 

John Wong wrote:

Laura Lambert wrote: Thursday, September 24, 2015, 08:39 IGP1 = 6.5e-7Torr HS water valves opened, no leaks detected. Tapped up manually to 35A. Waited ~20min. Vacuum stable, IGP1 = 1.5e-6 Torr. Initiated auto-ramp at 0.2A/min and 0.1A/min for the TGHT and TBHT respectively with final setpoints of 250A and 230A. Final temp of 1200C on auto-ramp in order to initiate temperature measurements starting at ~1200C. Thursday, September 24, 2015, 10:24   IGP1 = 8.7e-7 Torr TGHT = 44A, TBHT = 38A Increasing auto-ramp to 0.5A/min and 0.2A/min for the TGHT and TBHT respectively.      Thursday, September 24, 2015, 12:04  A few notes about the target container:The Ta-foil is cut in a full length of the target container, and that also covers up the back block, and the container is wrapped with 3 sheets (see attachment)  The inner tube is coated with TaC, using the "flushing technique" - the coating looks much better; will see how it turns out after the sintering process The target will be heated up to 1900C .  Due to the new wrapping of the Ta-heat shield, the heat distribution may be different.  So the target heater will be ramped up to achieve the desired temperature.   Thursday, September 24, 2015, 18:45   TGHT reached to 250A3.6V, TGHT at 230A and stayed for 1.5 hours.  Temp-L = 1280C, Temp-R = 1360C.   Auto-ramp TGHT to 500A at 1A/min and heat at that current for overnight.  Will take temp reading tomorrow.   Thursday, September 24, 2015, 23:08   TGHT has reached to 500A/8.57V.  Temp-L = 1895C, Temp-R = 2073C. (Not sure why the temperature is real, will need to investigate more to get an absolute temp) Just to be safe… Ramping down TGHT to 425A (according to e-log id 216, Temp-R reached to 1800C with TGHT at 425A/6.84V, but no temp measured for the left at that time) Will check again later. Friday, September 25, 2015, 11:52   The target has been heated at 420A for ~12hours; temp measured ~1900C, slightly higher than the previous target container (W.O#40860-1); the Ta-wraping could affect the heat distribution.   The temperature is also confirmed by using the 2-C digital pyrometer.  The tube inner surface is measured about 1900C, and the ionizer tube is about 2400C.  (see attachment #2). Initiating auto-cooling at 2A/min for TGHT and 1A/min for TBHT. The target will be inspected next Monday  Wednesday, September 30, 2015, 16:01 The target container is fully sintered (see attachment#3)  It is still in the discussion where this container will be used online for the UCx.  Nevertheless, the target contain is ready and it looks pretty good.

 Tuesday, October 06, 2015, 15:09

After further discussion, we are going to reheat this container to 420A.  The temperature will be measured with the thermocouple - probe inside the centre of the tube - and the 2C-IR for comparison. 

This test is to ensure that the container is actually heated to 1900C before the UCx material can be loaded

The chamber has been pumped down to 1.92e-6 Torr.  Heat shield valve is open and no leaks are detected. 

Ramping up TBHT to 230A max and TGHT to achieve ~1900C

 Wednesday, October 07, 2015, 11:12

Yesterday...

TBHT ramped up to 230A and TGHT was at 160A before taking temperature readings. 

TGHT from 160A to 423A, IR2C temp reading increases linearly from 1138C to 1900C, whereas the thermocouple readouts are not quite linear, 1040C to 1748C (see attachment)

After 18 hours, both temp reader dropped about 45C. 

Increased TGHT to 440C, IR2C & thermocouple currently read 1912C & 1762C, respectively. 

 Wednesday, October 07, 2015, 12:28

Lowered TBHT to 200A and TGHT remained at 440A.  IR2C = 1900C, TypeC = 1745C.  Not much affect from TBHT. 

Will increase TBHT back to 230A, then start ramping down TGHT and taking temp readings. 

 Wednesday, October 07, 2015, 17:49

Stepped down TGHT to 160A and TBHT stayed at 230A.  Cooling down temp is generated.  See attachment. 

Notice the overall temp during cooling is lower than that during heating. 

TGHT and TBHT will be ramped down to 0A. 

Chamber will be vented tomorrow. 

More details later...

John Wong wrote:

John Wong wrote: Laura Lambert wrote: Thursday, September 24, 2015, 08:39 IGP1 = 6.5e-7Torr HS water valves opened, no leaks detected. Tapped up manually to 35A. Waited ~20min. Vacuum stable, IGP1 = 1.5e-6 Torr. Initiated auto-ramp at 0.2A/min and 0.1A/min for the TGHT and TBHT respectively with final setpoints of 250A and 230A. Final temp of 1200C on auto-ramp in order to initiate temperature measurements starting at ~1200C. Thursday, September 24, 2015, 10:24   IGP1 = 8.7e-7 Torr TGHT = 44A, TBHT = 38A Increasing auto-ramp to 0.5A/min and 0.2A/min for the TGHT and TBHT respectively.      Thursday, September 24, 2015, 12:04  A few notes about the target container:The Ta-foil is cut in a full length of the target container, and that also covers up the back block, and the container is wrapped with 3 sheets (see attachment)  The inner tube is coated with TaC, using the "flushing technique" - the coating looks much better; will see how it turns out after the sintering process The target will be heated up to 1900C .  Due to the new wrapping of the Ta-heat shield, the heat distribution may be different.  So the target heater will be ramped up to achieve the desired temperature.   Thursday, September 24, 2015, 18:45   TGHT reached to 250A3.6V, TGHT at 230A and stayed for 1.5 hours.  Temp-L = 1280C, Temp-R = 1360C.   Auto-ramp TGHT to 500A at 1A/min and heat at that current for overnight.  Will take temp reading tomorrow.   Thursday, September 24, 2015, 23:08   TGHT has reached to 500A/8.57V.  Temp-L = 1895C, Temp-R = 2073C. (Not sure why the temperature is real, will need to investigate more to get an absolute temp) Just to be safe… Ramping down TGHT to 425A (according to e-log id 216, Temp-R reached to 1800C with TGHT at 425A/6.84V, but no temp measured for the left at that time) Will check again later. Friday, September 25, 2015, 11:52   The target has been heated at 420A for ~12hours; temp measured ~1900C, slightly higher than the previous target container (W.O#40860-1); the Ta-wraping could affect the heat distribution.   The temperature is also confirmed by using the 2-C digital pyrometer.  The tube inner surface is measured about 1900C, and the ionizer tube is about 2400C.  (see attachment #2). Initiating auto-cooling at 2A/min for TGHT and 1A/min for TBHT. The target will be inspected next Monday  Wednesday, September 30, 2015, 16:01 The target container is fully sintered (see attachment#3)  It is still in the discussion where this container will be used online for the UCx.  Nevertheless, the target contain is ready and it looks pretty good.     Tuesday, October 06, 2015, 15:09 After further discussion, we are going to reheat this container to 420A.  The temperature will be measured with the thermocouple - probe inside the centre of the tube - and the 2C-IR for comparison.  This test is to ensure that the container is actually heated to 1900C before the UCx material can be loaded The chamber has been pumped down to 1.92e-6 Torr.  Heat shield valve is open and no leaks are detected.  Ramping up TBHT to 230A max and TGHT to achieve ~1900C  Wednesday, October 07, 2015, 11:12 Yesterday... TBHT ramped up to 230A and TGHT was at 160A before taking temperature readings.  TGHT from 160A to 423A, IR2C temp reading increases linearly from 1138C to 1900C, whereas the thermocouple readouts are not quite linear, 1040C to 1748C (see attachment) After 18 hours, both temp reader dropped about 45C.  Increased TGHT to 440C, IR2C & thermocouple currently read 1912C & 1762C, respectively.   Wednesday, October 07, 2015, 12:28 Lowered TBHT to 200A and TGHT remained at 440A.  IR2C = 1900C, TypeC = 1745C.  Not much affect from TBHT.  Will increase TBHT back to 230A, then start ramping down TGHT and taking temp readings.   Wednesday, October 07, 2015, 17:49 Stepped down TGHT to 160A and TBHT stayed at 230A.  Cooling down temp is generated.  See attachment.  Notice the overall temp during cooling is lower than that during heating.  TGHT and TBHT will be ramped down to 0A.  Chamber will be vented tomorrow.  More details later...

Thursday, October 08, 2015, 12:01  

Test 2: To heat the target container back to ~440A and measure the temperature with the type C thermocouple (inside the tube, away from the centre block) and compared the temp reading with the 2C-IR.   

Chamber is currently being pump down, vac at 9e-6 Torr.  

Will ramp up TGHT to 160A and TBHT to 230A at 2A/min.

 Thursday, October 08, 2015, 17:01

TGHT is now at 440A, TBHT is constant at 230A - IR2C is reading the same as before, 1910C, but Type C is reading lower at 1770C.  (see attachment)

Will keep the current at 440A overnight. 

 Friday, October 09, 2015, 10:06

TGHT has stayed at 440A, TBHT at 230A for ~18hours.  R-temp dropped slightly from 1910C to 1890C and typeC dropped from 1770 to 1756; otherwise the measurements are reproducible. 

After the group discussion, the online heating curve will be re-calculated based on the temp reading from the IR2C curve. 

Next, the target container will be filled with UCx material and the conditioning current for Evap#1 will only go up to 440A (or at least the required current to reach the end of the re-carbonization step). 

So pay attention to the current when heating the target up in EVAP#1.

Initiate cooling at 2A/min for TGHT and 1A/min TBHT

 Friday, October 09, 2015, 11:35

A note about the voltage that may explain the change in the temperature: 

See attachment #2: 

Left plot = Test #1:

Initially TGHT ramped up to 423A and temp measured at 1900C.  Notice, about an hour later, there was a sudden drop in the voltage, and from thereon, the temp was measured at 1860C.  About 18 hours later, TGHT was increased to 440A to achieve 1910C.  

Right plot = Test #2 
Ramped up TGHT to 440A, temp measured 1910C.  At that constant current over the 6 hours period, the voltage slowly increased, and the temperature slightly dropped to 1895C.  

 Wednesday, October 21, 2015, 17:35

This container is prepared for a backup UCx target (otherwise it will be used for development purposes).

The container is coated with TaC; one layer of Ta-heat shield is used. 

TGHT will be ramped up to reach 1900C (previous container had TGHT ramped up to 440A).  

TBHT will be ramped up to max 230A.  

Chamber is currently being pumped down.  

Heating can begin once the vacuum is good, currently at 4.8e-5 Torr. 

 Friday, October 23, 2015, 16:15

TGHT reached to 500A and temp measured at 1940C.  More about the temp plot can be found in the dropbox.

Initiated cooling down at 2A/min. 

Target will be inspected next Monday.

John Wong wrote:

Wednesday, October 21, 2015, 17:35 This container is prepared for a backup UCx target (otherwise it will be used for development purposes). The container is coated with TaC; one layer of Ta-heat shield is used.  TGHT will be ramped up to reach 1900C (previous container had TGHT ramped up to 440A).   TBHT will be ramped up to max 230A.   Chamber is currently being pumped down.   Heating can begin once the vacuum is good, currently at 4.8e-5 Torr.

 Thursday, October 22, 2015, 11:36

HS water valves opened, no leaks detected.

Tapped up manually to 35A.

Vacuum stabilized, initiated auto-ramp at 0.2A/min and 0.1A/min for the TGHT and TBHT respectively.

Final setpoints TGHT = 300A, TBHT = 230A

IGP1 = 1.0e-6 Torr; TGHT = 45.18A, 0.17V; TBHT = 38.4A, 0.41V

Laura Lambert wrote:

John Wong wrote:  Wednesday, October 21, 2015, 17:35 This container is prepared for a backup UCx target (otherwise it will be used for development purposes). The container is coated with TaC; one layer of Ta-heat shield is used.  TGHT will be ramped up to reach 1900C (previous container had TGHT ramped up to 440A).   TBHT will be ramped up to max 230A.   Chamber is currently being pumped down.   Heating can begin once the vacuum is good, currently at 4.8e-5 Torr.     Thursday, October 22, 2015, 11:36 HS water valves opened, no leaks detected. Tapped up manually to 35A. Vacuum stabilized, initiated auto-ramp at 0.2A/min and 0.1A/min for the TGHT and TBHT respectively. Final setpoints TGHT = 300A, TBHT = 230A IGP1 = 1.0e-6 Torr; TGHT = 45.18A, 0.17V; TBHT = 38.4A, 0.41V

 Thursday, October 22, 2015, 17:09

Pressure coming down to 1.5e-6 Torr. 

Increased ramping rate to 2A/min for both TGHT and TBHT.

John Wong wrote:

Laura Lambert wrote: John Wong wrote:  Wednesday, October 21, 2015, 17:35 This container is prepared for a backup UCx target (otherwise it will be used for development purposes). The container is coated with TaC; one layer of Ta-heat shield is used.  TGHT will be ramped up to reach 1900C (previous container had TGHT ramped up to 440A).   TBHT will be ramped up to max 230A.   Chamber is currently being pumped down.   Heating can begin once the vacuum is good, currently at 4.8e-5 Torr.     Thursday, October 22, 2015, 11:36 HS water valves opened, no leaks detected. Tapped up manually to 35A. Vacuum stabilized, initiated auto-ramp at 0.2A/min and 0.1A/min for the TGHT and TBHT respectively. Final setpoints TGHT = 300A, TBHT = 230A IGP1 = 1.0e-6 Torr; TGHT = 45.18A, 0.17V; TBHT = 38.4A, 0.41V    Thursday, October 22, 2015, 17:09 Pressure coming down to 1.5e-6 Torr.  Increased ramping rate to 2A/min for both TGHT and TBHT.

 Monday, October 26, 2015, 16:10

Target container was ramped down over the weekend and taken out today.

Coating looks good.

Will add on another Ta layer and continue with temperature measurements.

See attachment for raw data.

 Monday, October 26, 2015, 16:16

Container previously sintered with TaC coating and temperature measurements taken with 1x Ta heat shield [see elog ID# 256]

2x Ta heat shields on this container.

Loaded into evap2 and currently pumping down.

 Tuesday, October 27, 2015, 10:07

HS water valves opened up this morning, no leaks detected.

Tapped up manually to 35A.

Waited ~10min, vacuum stable

Initiating auto-ramp at 2.0A/min and 1.0A/min for the TGHT and TBHT respectively.

Final setpoints: 300A for the TGHT and 230A for the TBHT

 Tuesday, October 27, 2015, 13:54

Reached final setpoints.

IGP1 = 5.3e-7 Torr.

Tapping up manually to 1900C

Tuesday, October 27, 2015, 16:42

Tapped up manually to 1900C

TGHT = 455A, 7.66V

IGP1 = 9e-7 Torr

Will remain at 455A overnight and ramp-down in the morning.

Wednesday, October 28, 2015, 09:32 

TGHT remained at 455A for ~17hrs.

IGP1 = 4.3e-7 Torr.

OMEGA = 1888C

See attachment for raw data of temperature measurements.

Initiating auto-cool at 2.0A/min and 1.0A/min for the TGHT and TBHT respectively.

 Wednesday, October 28, 2015, 16:32

Vented and took out this afternoon.

Container looks good. 

See photos attached.

 Monday, November 02, 2015, 16:28

Container previously sintered with TaC coating and temperature measurements taken with 1x Ta heat shield [see elog ID# 256] and 2x Ta heat shield [see elog ID#257]

3x Ta heat shields on this container.

Loaded into evap2 and currently pumping down.

 Tuesday, November 03, 2015, 10:37

HS water valves opened up this morning, no leaks detected.

Tapped up manually to 35A.

Vacuum stable.

IGP1 = 6.8e-7 Torr.

Initiating auto-ramp at 2.0A/min and 1.0A/min for the TGHT and TBHT respectively.

Final setpoints: 250A for the TGHT and 230A for the TBHT

 Tuesday, November 03, 2015, 13:09

IGP1 = 7.7e-7 Torr

TGHT = 250A, 3.42V

TBHT = 185A, 3.0V

OMEGA = 1237C

Increasing ramping rate of TBHT to 2.0A/min.

 Tuesday, November 03, 2015, 13:47

Reached final setpoints.

IGP1 = 8.7e-7 Torr.

Tapping up manually to 1900C

 Tuesday, November 03, 2015, 15:45

Tapped up manually to 1900C

TGHT = 450A, 7.26V

IGP1 = 1.6e-6 Torr

Will remain at 450A overnight and ramp-down in the morning.

 Wednesday, November 04, 2015, 10:00

TGHT remained at 450A for ~18hrs.

IGP1 = 6e-7 Torr.

OMEGA = 1908C

See attachment for raw data of temperature measurements and picture showing voltage movement at max setpoint.

Initiating auto-cool at 2.0A/min and 1.0A/min for the TGHT and TBHT respectively.

 Wednesday, November 04, 2015, 16:43

Vented and took out this afternoon.

Container looks good.

No visible changes to container compared to 2xTa heat shield temp measurements.

 Thursday, November 05, 2015, 16:19

Springs coated with TaC and loaded into container for sintering.

3x Ta heat shield.

EVAP2 currently pumping down.

 Friday, November 06, 2015, 08:39

Opened HS water valves, no leaks detected.

Tapped up manually to 35A.

IGP1 = 5.5e-7 Torr.

 Friday, November 06, 2015, 10:08

IGP1 = 5.8e-7 Torr.

Vacuum stable.

Initiating auto-ramp at 0.2A/min and 0.1A/min with final setpoints of 450A and 230A for the TGHT and TBHT respectively.

See photos attached to view how springs were coated and loaded into container.

 Monday, November 09, 2015, 09:07

TGHT reached 450A, 7.2V ~8pm sat, nov 7th.

OMEGA = 1775C

IGP1 = 3.2e-7 Torr.

Tapping up manually to 1900C.

Laura Lambert wrote:

Thursday, November 05, 2015, 16:19 Springs coated with TaC and loaded into container for sintering. 3x Ta heat shield. EVAP2 currently pumping down.  Friday, November 06, 2015, 08:39 Opened HS water valves, no leaks detected. Tapped up manually to 35A. IGP1 = 5.5e-7 Torr.  Friday, November 06, 2015, 10:08 IGP1 = 5.8e-7 Torr. Vacuum stable. Initiating auto-ramp at 0.2A/min and 0.1A/min with final setpoints of 450A and 230A for the TGHT and TBHT respectively. See photos attached to view how springs were coated and loaded into container.  Monday, November 09, 2015, 09:07 TGHT reached 450A, 7.2V ~8pm sat, nov 7th. OMEGA = 1775C IGP1 = 3.2e-7 Torr. Tapping up manually to 1900C.

 Monday, November 09, 2015, 12:30

Checked the temp on the inner surface (not at the spring) of the container was around 2050C at 500A. 

The TaC coated spring is reading at 1900C; that's what the OMEGA is reading with the setting for 2-colors and slope at 0.98.

Lower TGHT to 450A/ 7.12V.

By comparing the data from the previous temp curve (OMEGA slope at 0.98) with no material inside the container,  the voltage and current plot is aligned with the curve.

Changed OMEGA setting slope to 1.04.  Current temp is reading at 1917C at 450A.

For 2-Color setting, the emissivity should be negligible.  That makes me believe that different materials has different slope setting for the temp reading.  

One thing to note is that, the sintering temp of TaC is around 1900-2000C.  It was clear that the container was fully sintered with TGHT at 450A.

Will need to gather more data with different material to understand the slope setting better. 

Try: 

SiC at 1700C, slope at 1.04

ZrC at 1900C, slope at 104

Ta at 1900C, slope at 0.98.

Compare the data...

John Wong wrote:

Laura Lambert wrote:  Thursday, November 05, 2015, 16:19 Springs coated with TaC and loaded into container for sintering. 3x Ta heat shield. EVAP2 currently pumping down.  Friday, November 06, 2015, 08:39 Opened HS water valves, no leaks detected. Tapped up manually to 35A. IGP1 = 5.5e-7 Torr.  Friday, November 06, 2015, 10:08 IGP1 = 5.8e-7 Torr. Vacuum stable. Initiating auto-ramp at 0.2A/min and 0.1A/min with final setpoints of 450A and 230A for the TGHT and TBHT respectively. See photos attached to view how springs were coated and loaded into container.  Monday, November 09, 2015, 09:07 TGHT reached 450A, 7.2V ~8pm sat, nov 7th. OMEGA = 1775C IGP1 = 3.2e-7 Torr. Tapping up manually to 1900C.    Monday, November 09, 2015, 12:30 Checked the temp on the inner surface (not at the spring) of the container was around 2050C at 500A.  The TaC coated spring is reading at 1900C; that's what the OMEGA is reading with the setting for 2-colors and slope at 0.98. Lower TGHT to 450A/ 7.12V. By comparing the data from the previous temp curve (OMEGA slope at 0.98) with no material inside the container,  the voltage and current plot is aligned with the curve. Changed OMEGA setting slope to 1.04.  Current temp is reading at 1917C at 450A. For 2-Color setting, the emissivity should be negligible.  That makes me believe that different materials has different slope setting for the temp reading.   One thing to note is that, the sintering temp of TaC is around 1900-2000C.  It was clear that the container was fully sintered with TGHT at 450A. Will need to gather more data with different material to understand the slope setting better.  Try:  SiC at 1700C, slope at 1.04 ZrC at 1900C, slope at 104 Ta at 1900C, slope at 0.98. Compare the data...

 Monday, November 09, 2015, 14:20

IGP1 = 3.3e-7 Torr.

TGHT = 450A, 7.12V

OMEGA = 1915C

Initiating auto-cool at 2.0A/min and 1.0A/min for the TGHT and TBHT respectively.

 Tuesday, November 10, 2015, 13:23

Vented and opened this morning.

springs look [mostly] sintered.

see photo attached.