Tuesday, August 02, 2016, 13:41

Target container contains 471 discs of SiC [6 x 5 packs + 441 single discs]

Target packed length = 16cm. 

Mass of SiC(green)  = 52.7172g

Container is wrapped with 3 heatshields; no end caps are inserted yet - coated spring inserted both sides to hold discs in place.

Sintering temp = 1800C

TGHT max = 350A.  TBHT max at 230A. 

Chamber is currently being pumped down. 

Slope on OMEGA = 1.04

Tuesday, August 02, 2016, 16:00

Tapped up manually to 30A - vacuum to high, lowered down to 20A to be able to initiate auto-ramp.

IGP1 = 2.3e-5 Torr

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

 Friday, August 05, 2016, 11:57

Evap2 has reached TGHT = 350A, 5.33V

TBHT = 187A, 2.31V and still climbing...

OMEGA = 1365C

IGP1 = 7.88e-7 Torr

Increased max setpoint for TGHT to 400A.

 Friday, August 05, 2016, 13:33

TGHT = 380A, 5.97V

TBHT = 197A, 2.45V

OMEGA = 1396C

IGP1 = 8.75e-7 Torr

Increasing ramping rate to 2.0A/min and 1.0A/min for the TGHT and TBHT respectively.

New final setpoint for the TGHT = 450A

 Friday, August 05, 2016, 14:17

TBHT = 230A, 2.97V

TGHT = 450A, 7.4V

OMEGA = 1572C

IGP1 = 3.2e-6 Torr

Increasing max setpoint for TGHT to 500A and re-initiating auto-ramp.

 Friday, August 05, 2016, 15:18

At TGHT = 480A, OMEGA temperature dropped to 1400C due to coating on window.

Last reading was ~1600C

Tapped up manually to TGHT = 500A, 8.61V

Window fully coated therefore OMEGA reading is negligible at this point

Attempted to take temperature reading with other OMEGA from behind evaporator or using handheld manual temperature reader - all windows have a coating, therefore unsuccessful.

IGP1 = 1.75e-6 Torr

Reduced max voltage set for TGHT to 9.0V to minimize possibly voltage 'creep'

Will remain at these setpoints over wknd and ramp down monday morning.

 Monday, August 08, 2016, 08:45

TGHT = 500A on the 'current set' and 466A on the readout, 8.74V

TBHT = 230A, 2.99V

IGP1 = 6.6e-8 Torr

OMEGA = 1460C [reading through coating on window port]

Evap2 has been at these setpoints for the wknd.

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

 Monday, August 08, 2016, 10:38

Quick observational note:

while ramping down OMEGA readings have slowly increased.

At ~350A OMEGA = ~1500C

At ~300A, OMEGA = ~1750C

Currently at 280A, OMEGA = ~2800C

Coating on window has affected the OMEGA readings in a weird way...

 Monday, August 08, 2016, 15:17

Vented in air and opened up this afternoon.

Cleaned windows but left target loaded in evap2 for conditioning process.

 Monday, August 08, 2016, 15:19

Previously sintered over weekend [see elog i.d 311]

Target container contains 471 discs of SiC [6 x 5 packs + 441 single discs]

Target packed length = 16cm. 

Mass of 533 discs SiC(green)  = 52.7172g

Container is wrapped with 3 heatshields; no end caps are inserted yet - coated spring inserted both sides to hold discs in place.

Conditioning temp = 1800C.

TGHT max = 450A.  TBHT max = 230A. 

Chamber is currently being pumped down. 

 Monday, August 08, 2016, 16:38

Target was not removed from evap2 after sintering, vented and cleaned windows only.

IGP1 = 5.5e-6 Torr

Stepped up manually to 80A, vacuum stable.

IGP1 = 3.2e-6 Torr

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

 Thursday, August 11, 2016, 14:14

Tues the TGHT reached ~280A via auto-ramp

Evap2 was then tapped up manually to 480A/ ~1800C

Temperature readings on OMEGA have fluctuated up and down during conditioning process which was also observed for SiC#33

Also consistent with SiC#33, a lower current was required to reach 1800C during the conditioning process compared to the sintering process.

See attached link for data.

 Tuesday, August 16, 2016, 16:25

TGHT remained at 480A, 9.2V for ~7 days.

IGP1 = 6.5e-6 Torr

OMEGA = 1470C [with window coating, so temperature reading compromised]

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

Wednesday, August 17, 2016, 13:40

Vented in air and opened this morning.

Target broke  

Target clearly heated to high.

See attached snapshot of striptool from conditioning process.

Will update later with photos of broken container

Laura Lambert wrote:

Monday, August 08, 2016, 15:19 Previously sintered over weekend [see elog i.d 311] Target container contains 471 discs of SiC [6 x 5 packs + 441 single discs] Target packed length = 16cm.  Mass of 533 discs SiC(green)  = 52.7172g Container is wrapped with 3 heatshields; no end caps are inserted yet - coated spring inserted both sides to hold discs in place. Conditioning temp = 1800C. TGHT max = 450A.  TBHT max = 230A.  Chamber is currently being pumped down.   Monday, August 08, 2016, 16:38 Target was not removed from evap2 after sintering, vented and cleaned windows only. IGP1 = 5.5e-6 Torr Stepped up manually to 80A, vacuum stable. IGP1 = 3.2e-6 Torr Initiating auto-ramp at 0.2A/min for the TGHT and 0.1A/min for the TBHT.  Thursday, August 11, 2016, 14:14 Tues the TGHT reached ~280A via auto-ramp Evap2 was then tapped up manually to 480A/ ~1800C Temperature readings on OMEGA have fluctuated up and down during conditioning process which was also observed for SiC#33 Also consistent with SiC#33, a lower current was required to reach 1800C during the conditioning process compared to the sintering process. See attached link for data.  Tuesday, August 16, 2016, 16:25 TGHT remained at 480A, 9.2V for ~7 days. IGP1 = 6.5e-6 Torr OMEGA = 1470C [with window coating, so temperature reading compromised] Initiating auto cool at 2.0A/min and 1.0A/min for the TGHT and TBHT respectively. Wednesday, August 17, 2016, 13:40 Vented in air and opened this morning. Target broke   Target clearly heated to high. See attached snapshot of striptool from conditioning process. Will update later with photos of broken container

 Tuesday, August 30, 2016, 15:17

A better look at the p/s voltage over the course of the constant heating at 480A.  (see attachment).

The striptool shows the voltage was not giving a stable output.  There were multiple occasions that the voltage dropped and then recovered; the obvious was on Aug 16.  This indicates that  the target was breaking up.

Finally on Aug 17, the voltage dropped and never recovered again - that indicates the target was broken.

Tuesday, April 26, 2016, 13:32

Container coated with TaC using 'flushing technique'.

Wrapped with 3 x Ta heat shields, incl center block - new method of each layer being one long single Ta foil covering entire container incl center block

Currently pumping down in evap2

 Wednesday, April 27, 2016, 10:25

IGP1 = 2.6e-7 Torr.

HS water valves opened, no leaks detected.

Tapped up manually to 35A.

Waited ~35min

Vacuum stable, IGP1 = 6.7e-7 Torr

Initiated auto-ramp at 0.2A/min for the TGHT with a final setpoint of 400A

Final desired temperature = 1900C

 Thursday, April 28, 2016, 14:41

Previously TBHT not on when sintering IGLIS container [since no ionizer tube] - John decided will turn on for this round

Tapped up TBHT manually to 140A, 1.69V

IGP1 = 4.5e-7 Torr

OMEGA = 1635C

TGHT = 382A, 5.8V

Initiating auto-ramp of TBHT at 0.1A/min with a final setpoint of 230A.

Friday, April 29, 2016, 08:40

IGP1 = 2.22-7 Torr

TGHT = 400A, 6.1V

TBHT = 233A, 2.9V

OMEGA = 1719C

Tapping up manually to OMEGA = 1900C

Friday, April 29, 2016, 15:22

IGP1 = 3.0e-7 Torr

TGHT = 460A, 7.52V

TBHT =230A, 2.93V

OMEGA = 1904C

Target container has remained at max temperature setpoint of 1900C for 4.5hrs.

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

 Monday, May 02, 2016, 08:35

Vented in air and opened up this morning.

Container looks good.

See attached photos.

John Wong wrote:

Laura Lambert wrote:  Thursday, June 04, 2015, 9:07 Container was sprayed with TaC and let dry. Container has 3x Ta heat shields including center block. Container was loaded into EVAP2 yesterday and pumped down overnight. HS water valves were opened up this morning, no leaks detected. IGP1 = 4.6e-7 Torr. Tapped up manually to 40A. Waited ~25min, Vacuum stable. IGP1 = 5.0e-7 Torr. Initiating auto-ramp. TGHT will be ramped to reach 2000C  Friday, June 05, 2015, 10:01 IGP1 = 4.5e-7 Torr. TGHT = 313A, 4.47V OMEGA = 1444C Increasing ramping rate to 1.0A/min  Friday, June 05, 2015, 11:31 IGP1 = 1.2e-6 Torr. Increasing ramping rate to 2.0A/min    Friday, June 05, 2015, 12:01 TGHT reached to 465A/7.56V, temp is stable at 2000C. Current vac at 1.2e-6 Torr and coming down Cooling down process can be initiated after 4 hours.

 Friday, June 05, 2015, 13:21

OMEGA = 1995C

Increasing TGHT to 470A to achieve desired max temperature of 2000C

Friday, June 05, 2015, 15:59

TGHT sat at max desired temperature of 2000C for ~4hrs.

TGHT = 470A, 7.7V

Initiating auto-cool at 1.0A/min.

 Monday, June 08, 2015, 11:31

Vented in air and opened up this morning.

Target container mostly sintered, two tiny patches near both ends not fully sintered.

Will re-install and re-sinter next week as another container with priority needs to be sintered first.

 Tuesday, June 09, 2015, 10:45

See attachements for 'not-fully-sintered' photos

Laura Lambert wrote:

John Wong wrote: Laura Lambert wrote:  Thursday, June 04, 2015, 9:07 Container was sprayed with TaC and let dry. Container has 3x Ta heat shields including center block. Container was loaded into EVAP2 yesterday and pumped down overnight. HS water valves were opened up this morning, no leaks detected. IGP1 = 4.6e-7 Torr. Tapped up manually to 40A. Waited ~25min, Vacuum stable. IGP1 = 5.0e-7 Torr. Initiating auto-ramp. TGHT will be ramped to reach 2000C  Friday, June 05, 2015, 10:01 IGP1 = 4.5e-7 Torr. TGHT = 313A, 4.47V OMEGA = 1444C Increasing ramping rate to 1.0A/min  Friday, June 05, 2015, 11:31 IGP1 = 1.2e-6 Torr. Increasing ramping rate to 2.0A/min    Friday, June 05, 2015, 12:01 TGHT reached to 465A/7.56V, temp is stable at 2000C. Current vac at 1.2e-6 Torr and coming down Cooling down process can be initiated after 4 hours.     Friday, June 05, 2015, 13:21 OMEGA = 1995C Increasing TGHT to 470A to achieve desired max temperature of 2000C Friday, June 05, 2015, 15:59 TGHT sat at max desired temperature of 2000C for ~4hrs. TGHT = 470A, 7.7V Initiating auto-cool at 1.0A/min.  Monday, June 08, 2015, 11:31 Vented in air and opened up this morning. Target container mostly sintered, two tiny patches near both ends not fully sintered. Will re-install and re-sinter next week as another container with priority needs to be sintered first.  Tuesday, June 09, 2015, 10:45 See attachements for 'not-fully-sintered' photos

 Wednesday, June 10, 2015, 12:06

After inspecting the target container,  the inner tube surface has "dark" patches, which may not be evenly coated or the coating layer was too think.  

See link for photos:  https://www.dropbox.com/sh/m94mjuuodwhz5jb/AADEBv_Kha_p_1An40eftWNHa?dl=0 

Attempt to re-spray the container and re-sinter.  

John Wong wrote:

Laura Lambert wrote: John Wong wrote: Laura Lambert wrote:  Thursday, June 04, 2015, 9:07 Container was sprayed with TaC and let dry. Container has 3x Ta heat shields including center block. Container was loaded into EVAP2 yesterday and pumped down overnight. HS water valves were opened up this morning, no leaks detected. IGP1 = 4.6e-7 Torr. Tapped up manually to 40A. Waited ~25min, Vacuum stable. IGP1 = 5.0e-7 Torr. Initiating auto-ramp. TGHT will be ramped to reach 2000C  Friday, June 05, 2015, 10:01 IGP1 = 4.5e-7 Torr. TGHT = 313A, 4.47V OMEGA = 1444C Increasing ramping rate to 1.0A/min  Friday, June 05, 2015, 11:31 IGP1 = 1.2e-6 Torr. Increasing ramping rate to 2.0A/min    Friday, June 05, 2015, 12:01 TGHT reached to 465A/7.56V, temp is stable at 2000C. Current vac at 1.2e-6 Torr and coming down Cooling down process can be initiated after 4 hours.     Friday, June 05, 2015, 13:21 OMEGA = 1995C Increasing TGHT to 470A to achieve desired max temperature of 2000C Friday, June 05, 2015, 15:59 TGHT sat at max desired temperature of 2000C for ~4hrs. TGHT = 470A, 7.7V Initiating auto-cool at 1.0A/min.  Monday, June 08, 2015, 11:31 Vented in air and opened up this morning. Target container mostly sintered, two tiny patches near both ends not fully sintered. Will re-install and re-sinter next week as another container with priority needs to be sintered first.  Tuesday, June 09, 2015, 10:45 See attachements for 'not-fully-sintered' photos    Wednesday, June 10, 2015, 12:06 After inspecting the target container,  the inner tube surface has "dark" patches, which may not be evenly coated or the coating layer was too think.   See link for photos:  https://www.dropbox.com/sh/m94mjuuodwhz5jb/AADEBv_Kha_p_1An40eftWNHa?dl=0  Attempt to re-spray the container and re-sinter.

 Friday, June 12, 2015, 14:58

re-sprayed with second layer of TaC spray this morning.

re-loaded into evap2.

HS water valves opened, no leaks detected.

will ramp-up over weekend.

Laura Lambert wrote:

John Wong wrote: Laura Lambert wrote: John Wong wrote: Laura Lambert wrote:  Thursday, June 04, 2015, 9:07 Container was sprayed with TaC and let dry. Container has 3x Ta heat shields including center block. Container was loaded into EVAP2 yesterday and pumped down overnight. HS water valves were opened up this morning, no leaks detected. IGP1 = 4.6e-7 Torr. Tapped up manually to 40A. Waited ~25min, Vacuum stable. IGP1 = 5.0e-7 Torr. Initiating auto-ramp. TGHT will be ramped to reach 2000C  Friday, June 05, 2015, 10:01 IGP1 = 4.5e-7 Torr. TGHT = 313A, 4.47V OMEGA = 1444C Increasing ramping rate to 1.0A/min  Friday, June 05, 2015, 11:31 IGP1 = 1.2e-6 Torr. Increasing ramping rate to 2.0A/min    Friday, June 05, 2015, 12:01 TGHT reached to 465A/7.56V, temp is stable at 2000C. Current vac at 1.2e-6 Torr and coming down Cooling down process can be initiated after 4 hours.     Friday, June 05, 2015, 13:21 OMEGA = 1995C Increasing TGHT to 470A to achieve desired max temperature of 2000C Friday, June 05, 2015, 15:59 TGHT sat at max desired temperature of 2000C for ~4hrs. TGHT = 470A, 7.7V Initiating auto-cool at 1.0A/min.  Monday, June 08, 2015, 11:31 Vented in air and opened up this morning. Target container mostly sintered, two tiny patches near both ends not fully sintered. Will re-install and re-sinter next week as another container with priority needs to be sintered first.  Tuesday, June 09, 2015, 10:45 See attachements for 'not-fully-sintered' photos    Wednesday, June 10, 2015, 12:06 After inspecting the target container,  the inner tube surface has "dark" patches, which may not be evenly coated or the coating layer was too think.   See link for photos:  https://www.dropbox.com/sh/m94mjuuodwhz5jb/AADEBv_Kha_p_1An40eftWNHa?dl=0  Attempt to re-spray the container and re-sinter.        Friday, June 12, 2015, 14:58 re-sprayed with second layer of TaC spray this morning. re-loaded into evap2. HS water valves opened, no leaks detected. will ramp-up over weekend.

 Friday, June 12, 2015, 16:07

Vacuum comes down to 6.1e-6 Torr.

Initiated auto-ramping at 0.2A/min for 300A first. 

John Wong wrote:

Laura Lambert wrote: John Wong wrote: Laura Lambert wrote: John Wong wrote: Laura Lambert wrote:  Thursday, June 04, 2015, 9:07 Container was sprayed with TaC and let dry. Container has 3x Ta heat shields including center block. Container was loaded into EVAP2 yesterday and pumped down overnight. HS water valves were opened up this morning, no leaks detected. IGP1 = 4.6e-7 Torr. Tapped up manually to 40A. Waited ~25min, Vacuum stable. IGP1 = 5.0e-7 Torr. Initiating auto-ramp. TGHT will be ramped to reach 2000C  Friday, June 05, 2015, 10:01 IGP1 = 4.5e-7 Torr. TGHT = 313A, 4.47V OMEGA = 1444C Increasing ramping rate to 1.0A/min  Friday, June 05, 2015, 11:31 IGP1 = 1.2e-6 Torr. Increasing ramping rate to 2.0A/min    Friday, June 05, 2015, 12:01 TGHT reached to 465A/7.56V, temp is stable at 2000C. Current vac at 1.2e-6 Torr and coming down Cooling down process can be initiated after 4 hours.     Friday, June 05, 2015, 13:21 OMEGA = 1995C Increasing TGHT to 470A to achieve desired max temperature of 2000C Friday, June 05, 2015, 15:59 TGHT sat at max desired temperature of 2000C for ~4hrs. TGHT = 470A, 7.7V Initiating auto-cool at 1.0A/min.  Monday, June 08, 2015, 11:31 Vented in air and opened up this morning. Target container mostly sintered, two tiny patches near both ends not fully sintered. Will re-install and re-sinter next week as another container with priority needs to be sintered first.  Tuesday, June 09, 2015, 10:45 See attachements for 'not-fully-sintered' photos    Wednesday, June 10, 2015, 12:06 After inspecting the target container,  the inner tube surface has "dark" patches, which may not be evenly coated or the coating layer was too think.   See link for photos:  https://www.dropbox.com/sh/m94mjuuodwhz5jb/AADEBv_Kha_p_1An40eftWNHa?dl=0  Attempt to re-spray the container and re-sinter.        Friday, June 12, 2015, 14:58 re-sprayed with second layer of TaC spray this morning. re-loaded into evap2. HS water valves opened, no leaks detected. will ramp-up over weekend.  Friday, June 12, 2015, 16:07 Vacuum comes down to 6.1e-6 Torr. Initiated auto-ramping at 0.2A/min for 300A first.

Sunday, June 14, 2015, 09:37  

TGHT at 254.2A/3.5V3, DV = 1.614V Temp at 1177C. 

Vacuum is stable at 3.2e-7 Torr.  

Increase ramping rate at 2A/min until TGHT reached 300A. 

Sunday, June 14, 2015, 10:04  

TGHT reached 300A, temp 1368C.

Tapping up to ~1800C

Sunday, June 14, 2015, 11:26 

TGHT at 425A/6.84V, DV 3.59V, temp at 1814C, 

Vacuum coming down, currently at 7.5e-7 Torr. 

Will remain at that current for at least 4 hours before cooling down

Sunday, June 14, 2015, 17:15  

Target container has been sintered with TiC for over 6 hours at 1823C, with TGHT at 425A/6.84V, DV at 3.584V. 

Vac at 4.9e-7 Torr.  

Cooling initiated.  

Chamber can be vented tomorrow and target container can be taken out for inspection. 

 Monday, June 15, 2015, 11:38

Target container was taken out for inspection.  

It's observed that the coated/sintered TaC surface is improved.  The sintered temperature was only gone up just above 1800C, so there still some area near the ends that is still somewhat "brownish", fully sintered shows a

smooth .  (see attachment) 

Spraying into a cylinder tube can be challenging.  It was observed that the coating was dispersed out from the end cap to the centre tube.  For that reason, the container isn't has much protective layer;vthe Ta surface can

react with carbides and the container eventually breaks.  Take the endcap process for example,  the caps are evenly coated with TaC and can be sintered up to 2000C (see e-log Evap ID 202).

Suggestions:  

Using a spray ball nozzle or some sort so that the inner tube can be evenly coated. 

Under investigating...

 Tuesday, September 23, 2014, 15:00

A new target boat [new design with no end caps] was sprayed with TaC coating and let dry.

The target boat is wrapped with 3-layers of Ta-heat shield.

The boat was installed in EVAP2, chamber is currently being pumped down.

Laura Lambert wrote:

Tuesday, September 23, 2014, 15:00 A new target boat [new design with no end caps] was sprayed with TaC coating and let dry. The target boat is wrapped with 3-layers of Ta-heat shield. The boat was installed in EVAP2, chamber is currently being pumped down.

 Tuesday, September 23, 2014, 18:31

Chamber was pumped down to 2.5e-6 Torr. 

HS water valve open; no leaks detected.

Stepping up TGHT to 40A - pressure is increasing...

 Tuesday, September 23, 2014, 19:05

Auto-ramping TGHT to 580A at 0.5A/min.  Temperature will be measured and TGHt will be adjusted accordingly.

 Wednesday, September 24, 2014, 11:57

Pressure is stable at 2.2-6 Torr as TGHT is ramping up.  Increase ramping rate to 2.0A/min.  Currently TGHT at 540A.

 Wednesday, September 24, 2014, 15:36

TGHT at 580A for 2 hrs.  Inner tube temp (left side wall, viewing from the window port) ~1800C (measured with Mikron = 1550C +250C em. correction); Vac @ 1.67e-6 Torr.

Temperature measurement distance from the window to Mikron = 45cm.

Increase TGHT to reach 2000C (Mikron @ 1750C)

 Wednesday, September 24, 2014, 18:14

TGHT has gone up to 725A/13.2V.  Temp measured at 1740C (+250C = ~2000C).  Pressure gone up to 5.5e-6 Torr and it's coming down slowly.

Will continue heating at this temperature for a few hours; then cool down afterward.

 Wednesday, September 24, 2014, 18:56

Temperature is pretty stable at 1740C on Mikron, and pressure is still coming down, currently at 2.9e-6 Torr.

Slow ramping down TGHT at 1.0A/min.  The chamber should be ready for venting tomorrow. 

Target boat will be inspected.

 Thursday, September 25, 2014, 17:25.

The boat was inspected and it turned out great!  The coating was fully sintered and there is no sign of damage on the boat. 

See the link for photos.

https://www.dropbox.com/sh/m7ycqhkj4avfull/AABHVTweTsP4ajeWZ6uoY010a?dl=0

Thursday, September 25, 2014, 17:32

Target boat is filled with Ta-coated endcaps.  The caps are stacked together.  In between each cap, a piece of graphite foil is used for separation so the Ta caps would not fused. 

See link for photos:

https://www.dropbox.com/sh/rydtdho6ggh4l3l/AAAYmvqT0mVQ_pnz4iecS4ksa?dl=0

The boat is wrapped with 3-layers of heatshields.  The chamber is currently being pumped down.

TGHT will be ramped up to 580A and the temperature will be measured.

Monday, September 29, 2014, 11:12

TGHt was stepped up to 40A on last Friday and chamber continues to pump down over the weekend.

Vac @ 2.56e-6 Torr, mp @ 19mTorr.

Ramping up TGHT 580A at 1.0A/min.

 Monday, September 29, 2014, 11:50

TGHT tripped off at 53A.  Reduce ramping rate to 0.5A/min for now.

 Monday, September 29, 2014, 16:17

Vacuum is coming down to 9.5e-7 Torr.  Increased ramping rate to 1.0A/min.

 Tuesday, September 30, 2014, 11:59

TGHT reached to 580A/10.18V.  Target has been heated at that current for almost 12 hrs. Vac @ 4.9e-7 Torr.

Local temp measured with Mikron = (1500C + 250 C correction) = 1750C

Cooling down at 2A/min.

 Thursday, October 02, 2014, 11:13

The coating is fully sintered; no sign of any damage on the endcaps.  

Process is successful.  

 Thursday, October 02, 2014, 11:51

Target container sprayed with TaC, currently drying in fume hood

 Monday, October 06, 2014, 12:11

Target container & back block is wrapped with 3 layers of Ta-heat shield.  The chamber has been pumped down over the weekend. 

Pressure currently at 2.23e-7 Torr. 

HS water valves open; no leaks detected.

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

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

Laura Lambert wrote:

Thursday, October 02, 2014, 11:51 Target container sprayed with TaC, currently drying in fume hood  Monday, October 06, 2014, 12:11 Target container & back block is wrapped with 3 layers of Ta-heat shield.  The chamber has been pumped down over the weekend.  Pressure currently at 2.23e-7 Torr.  HS water valves open; no leaks detected. TGHT will be ramped up to 580A at 0.2A/min TBHT will be ramped up to 230A at 0.2A/min.

 Monday, October 06, 2014, 12:16

Stepped up both TGHT/TBHT to 35A. 

Tuesday, October 07, 2014, 12:54

TBHT reached to 230A/3.7V and TGHT is still ramping up, currently at 303A/4.5V. Temp measured with Omega-IR2 = 1165C with e'=0.85

Pressure @ 5.2e-7 Torr. 

Increase ramping rate to 2A/min.

 Tuesday, October 07, 2014, 16:21

TGHT is now at 580A and TGHT at 230A.

Temperature is measured with OMEGA-IR2, MIKRON, and analog pyrometer - All the measurements are agreed at 1700C (without the tantalum emissivity correction of 250C)

The OMEGA-IR2 slope has changed to 0.97 for the correction - The real temperature reading from the display is showing 1935C.

Now... attempting to low TBHT to see any temperature change.

 Tuesday, October 07, 2014, 17:01

TGHT @ 580A.

TBHT = 180C, Temp = 1925C

TBHT = 130C, Temp = 1920C

Not much of change in the temperature on the target tube...

Tuesday, October 07, 2014, 17:07

Attempting to increase the temperature to 2000C

TGHT = 600A, Temp = 1955C

TGHT = 620A, Temp = 2000C

Target will continue heating at this temperature overnight... Will continue to monitor.

 Tuesday, October 07, 2014, 20:59

After almost 4 hours of heating at 620A on TGHT, the temperature has dropped to 1980C.  

Pressure is coming down to 1.17e-6 Torr.  

Increased TGHT to 630A to maintain temp @ 2000C

John Wong wrote:

Laura Lambert wrote:  Thursday, October 02, 2014, 11:51 Target container sprayed with TaC, currently drying in fume hood  Monday, October 06, 2014, 12:11 Target container & back block is wrapped with 3 layers of Ta-heat shield.  The chamber has been pumped down over the weekend.  Pressure currently at 2.23e-7 Torr.  HS water valves open; no leaks detected. TGHT will be ramped up to 580A at 0.2A/min TBHT will be ramped up to 230A at 0.2A/min.    Monday, October 06, 2014, 12:16 Stepped up both TGHT/TBHT to 35A.  Tuesday, October 07, 2014, 12:54 TBHT reached to 230A/3.7V and TGHT is still ramping up, currently at 303A/4.5V. Temp measured with Omega-IR2 = 1165C with e'=0.85 Pressure @ 5.2e-7 Torr.  Increase ramping rate to 2A/min.  Tuesday, October 07, 2014, 16:21 TGHT is now at 580A and TGHT at 230A. Temperature is measured with OMEGA-IR2, MIKRON, and analog pyrometer - All the measurements are agreed at 1700C (without the tantalum emissivity correction of 250C) The OMEGA-IR2 slope has changed to 0.97 for the correction - The real temperature reading from the display is showing 1935C. Now... attempting to low TBHT to see any temperature change.  Tuesday, October 07, 2014, 17:01 TGHT @ 580A. TBHT = 180C, Temp = 1925C TBHT = 130C, Temp = 1920C Not much of change in the temperature on the target tube... Tuesday, October 07, 2014, 17:07 Attempting to increase the temperature to 2000C TGHT = 600A, Temp = 1955C TGHT = 620A, Temp = 2000C Target will continue heating at this temperature overnight... Will continue to monitor.  Tuesday, October 07, 2014, 20:59 After almost 4 hours of heating at 620A on TGHT, the temperature has dropped to 1980C.   Pressure is coming down to 1.17e-6 Torr.   Increased TGHT to 630A to maintain temp @ 2000C

 Wednesday, October 08, 2014, 11:46

Temperature readout from omega-IR2C = 2054C

TGHT = 11.14V, 628.0A

TBHT = 2.01V, 129.8A

IGP1 = 8.2e-7Torr

Initiating auto-cool for TGHT @ 2A/min, TBHT @ 1A/min

 Thursday, October 09, 2014, 16:00

vented in air and opened up this morning

target container looks good!

Laura Lambert wrote:

John Wong wrote: Laura Lambert wrote:  Thursday, October 02, 2014, 11:51 Target container sprayed with TaC, currently drying in fume hood  Monday, October 06, 2014, 12:11 Target container & back block is wrapped with 3 layers of Ta-heat shield.  The chamber has been pumped down over the weekend.  Pressure currently at 2.23e-7 Torr.  HS water valves open; no leaks detected. TGHT will be ramped up to 580A at 0.2A/min TBHT will be ramped up to 230A at 0.2A/min.    Monday, October 06, 2014, 12:16 Stepped up both TGHT/TBHT to 35A.  Tuesday, October 07, 2014, 12:54 TBHT reached to 230A/3.7V and TGHT is still ramping up, currently at 303A/4.5V. Temp measured with Omega-IR2 = 1165C with e'=0.85 Pressure @ 5.2e-7 Torr.  Increase ramping rate to 2A/min.  Tuesday, October 07, 2014, 16:21 TGHT is now at 580A and TGHT at 230A. Temperature is measured with OMEGA-IR2, MIKRON, and analog pyrometer - All the measurements are agreed at 1700C (without the tantalum emissivity correction of 250C) The OMEGA-IR2 slope has changed to 0.97 for the correction - The real temperature reading from the display is showing 1935C. Now... attempting to low TBHT to see any temperature change.  Tuesday, October 07, 2014, 17:01 TGHT @ 580A. TBHT = 180C, Temp = 1925C TBHT = 130C, Temp = 1920C Not much of change in the temperature on the target tube... Tuesday, October 07, 2014, 17:07 Attempting to increase the temperature to 2000C TGHT = 600A, Temp = 1955C TGHT = 620A, Temp = 2000C Target will continue heating at this temperature overnight... Will continue to monitor.  Tuesday, October 07, 2014, 20:59 After almost 4 hours of heating at 620A on TGHT, the temperature has dropped to 1980C.   Pressure is coming down to 1.17e-6 Torr.   Increased TGHT to 630A to maintain temp @ 2000C    Wednesday, October 08, 2014, 11:46 Temperature readout from omega-IR2C = 2054C TGHT = 11.14V, 628.0A TBHT = 2.01V, 129.8A IGP1 = 8.2e-7Torr Initiating auto-cool for TGHT @ 2A/min, TBHT @ 1A/min  Thursday, October 09, 2014, 16:00 vented in air and opened up this morning target container looks good!

 Thursday, October 09, 2014, 16:36

Photos for the OMEGA-IR2C temp measurement can be found on this link (see also the subfolder for the heating process):

https://www.dropbox.com/sh/n5sxcepg7e847xw/AACMubuKW1idd49D1Nz_0diNa?dl=0

Laura Lambert wrote:

Friday, May 22, 2015, 11:43 A target boat was sprayed with TaC coating and let dry yesterday. The target boat is wrapped with 3-layers of Ta-heat shield. The boat was installed in EVAP2, chamber is currently being pumped down.  Friday, May 22, 2015, 14:22 HS water valves opened, no leaks detected. IGP1 = 2.4e-6 Torr. Tapping up manually...  Friday, May 22, 2015, 14:33 Tapped up to 20A. Vacuum jumped up to 7e-6 Torr. Backed off to 5A before vacuum started to drop again. IGP1 = 5e-6 Torr. Tapping up manually again...just more slowly...  Friday, May 22, 2015, 15:31 Tapped up to 12A, unable to tap up very fast due to volatile content in coating. IGP1 = 3.6e-6 Torr. Initiating auto-ramp at 0.1A/min with a max current of 580A.  Monday, May 25, 2015, 09:03 IGP1 = 3e-7 Torr. TGHT = 397.5A, 6.43V Increasing ramping rate to 1.0A/min.

 Monday, May 25, 2015, 17:06

TGHT at been at 580A for over 4 hours.  Cooling down in process at 1A/min. 

John Wong wrote:

Laura Lambert wrote:  Friday, May 22, 2015, 11:43 A target boat was sprayed with TaC coating and let dry yesterday. The target boat is wrapped with 3-layers of Ta-heat shield. The boat was installed in EVAP2, chamber is currently being pumped down.  Friday, May 22, 2015, 14:22 HS water valves opened, no leaks detected. IGP1 = 2.4e-6 Torr. Tapping up manually...  Friday, May 22, 2015, 14:33 Tapped up to 20A. Vacuum jumped up to 7e-6 Torr. Backed off to 5A before vacuum started to drop again. IGP1 = 5e-6 Torr. Tapping up manually again...just more slowly...  Friday, May 22, 2015, 15:31 Tapped up to 12A, unable to tap up very fast due to volatile content in coating. IGP1 = 3.6e-6 Torr. Initiating auto-ramp at 0.1A/min with a max current of 580A.  Monday, May 25, 2015, 09:03 IGP1 = 3e-7 Torr. TGHT = 397.5A, 6.43V Increasing ramping rate to 1.0A/min.    Monday, May 25, 2015, 17:06 TGHT at been at 580A for over 4 hours.  Cooling down in process at 1A/min.

 Vented in air and opened up this morning.

Target boat looks good! fully sintered! 

 Tuesday, May 26, 2015, 13:06

Endcaps were sprayed with TaC coating and let dry.

Each endcap is wrapped separately with a sheet of graphite foil and stacked in the target boat [see image]

The target boat is wrapped with 3-layers of Ta-heat shield.

The boat is installed in EVAP2, chamber is currently being pumped down.

 Wednesday, May 27, 2015, 08:50

HS water valves opened, no leaks detected.

Stepped up manually to 35A.

Initiated auto-ramp at 0.2A/min yesterday afternoon.

TGHT = 254A, 3.56V.

IGP1 = 5.9e-7 Torr.

Increasing ramping rate to 1.0A/min with a max setpoint of 400A.

Laura Lambert wrote:

Tuesday, May 26, 2015, 13:06 Endcaps were sprayed with TaC coating and let dry. Each endcap is wrapped separately with a sheet of graphite foil and stacked in the target boat [see image] The target boat is wrapped with 3-layers of Ta-heat shield. The boat is installed in EVAP2, chamber is currently being pumped down.  Wednesday, May 27, 2015, 08:50 HS water valves opened, no leaks detected. Stepped up manually to 35A. Initiated auto-ramp at 0.2A/min yesterday afternoon. TGHT = 254A, 3.56V. IGP1 = 5.9e-7 Torr. Increasing ramping rate to 1.0A/min with a max setpoint of 400A.

 Wednesday, May 27, 2015, 17:51

TGHT has been at 400A for almost 6 hours.  Temp at 1500C.

Cooling down to 0A at 1A/min.

Chamber will be vented to inspect the caps. 

May have to remove the graphite foil wrapped on the caps and re-sintered the caps to 1800C.