ELOG Evaporator

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.

260

Monday, November 09, 2015, 12:56

Sintering TaC coating on 'temporary endcaps' springs (Slope changed to 1.04)

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...

259

Thursday, November 05, 2015, 16:20

Sintering TaC coating on 'temporary endcaps' springs

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.

258

Monday, November 02, 2015, 16:29

temp measurements with 3xTa h.s on LPSIS (small block) container

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.

257

Monday, October 26, 2015, 16:17

temp measurements with 2xTa h.s on LPSIS (small block) container

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.

256

Monday, October 26, 2015, 16:14

Sintering TaC on LPSIS (small block) container & temp measurements with 1xTa h.s

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.

255

Thursday, October 22, 2015, 17:10

Sintering TaC on LPSIS (small block) container

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.

254

Thursday, October 22, 2015, 11:41

Sintering TaC on LPSIS (small block) container

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

253

Wednesday, October 21, 2015, 17:39

Sintering TaC on LPSIS (small block) container

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.

252

Thursday, October 08, 2015, 12:26

Test#2: Measuring temp with thermocouple (away from centre) & 2C-IR

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.

251

Tuesday, October 06, 2015, 15:18

Test#1: Measuring temp with thermocouple (centre) & 2C-IR

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...

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