Laura Lambert wrote:

Friday, May 29, 2015, 11:21 Total number of foils: 425 discs Total mass of materials [incl graphite foils]: 44.41g Total length packed: 12.3cm Container has no heat shields. No endcaps inserted to allow outgassing. Currently being pumped down.  Friday, May 29, 2015, 14:13 HS water valves opened, no leaks detected. IGP1 = 5.4e-6 Torr. Tapping up manually. Friday, May 29, 2015, 16:48 Tapped up manually to 20A. IGP1 = 5.9e-6 Torr. Initiating auto-ramp at 0.2A/min for the TGHT and 0.1A/min for the TBHT. Max setpoints set to 580A and 230A for the TGHT and TBHT respectively. Good Vacuum = 3.0e-5 Torr. Bad Vacuum = 4.0e-5 Torr.  Monday, June 01, 2015, 09:17 IGP1 = 3.8e-6 Torr. TGHT = 478A. TBHT reached max setpoint of 230A. Increasing ramping rate to 0.5A/min.  Monday, June 01, 2015, 13:15 Checked window for temperature readings, good visibility, no coating on window.  IGP1 = 9.1e-6 Torr. TGHT reached max setpoint of 580A 30min ago. Stepping up manually to a target temperature of 2000C...  Monday, June 01, 2015, 16:25 IGP1 = 6.5e-6 Torr. TGHT = 870A, 17.90V OMEGA = 1948C

 Monday, June 01, 2015, 17:59

After almost an hour at 870A, the temperature went up from 1948C to 1980C; however temperature around the target container/legs are >2000C.  The voltage on the power supply also went up slightly. 

There is a film coated on the window port and that could affect the temp reading.

To be safe, I lowered the TGHT to 830A/17.38V, temp at 1930C. 

Will keep at 830A for 4 hours and cool down this evening. 

Recommend: Using Ta-heat shields for sintering next time.

 Monday, June 01, 2015, 22:55

TGHT at 830A for almost 5 hours.  

TEMP has gone up to 1994C.  Voltage has also gone up to 19V.  

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

 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

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. 

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

 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.

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.  

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.

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

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. 

Monday, June 22, 2015, 13:00

Containers is coated with TaC. Wrapped with 3 layers of Ta heat-shield.  Air blown to for quick dry.

Installed, and pumped down, vac currently at 6.7e-6 Torr. 

HS water valve open, no leaks detected. 

Stepping up TGHT/TBTH:  50A.

 Monday, June 22, 2015, 14:22

Pressure is coming down, currently at 1.75e-5 Torr.

auto-ramping initiated: TGHT = 820A; TBHT = 230A, rate at 2A/min.

 Tuesday, June 23, 2015, 00:50

Target container has reached to 1860C and has been heated for almost 4 hours, with TGHT at 800A/12.60V, DV = 6.28. TBHT at 230A/3.8V.  

Vac at 3e-6 Torr.  

Cooling down at 2A/min.  

Chamber can be vented tomorrow and SiC can be loaded in for the sintering process. 

Tuesday, June 23, 2015, 12:21

Target container is loaded with 485 discs of SiC with packed length of 17.4cm. 

Container is wrapped with 3 Ta-heat shields and previously coated/sintered with TaC.

Chamber is currently being pumped down

TGHT will be ramped up to 800A, ~1800C, and TBHT is limited to 230A max.

 Tuesday, June 23, 2015, 15:53

HS valves are open, no leaks detected.

TGHT stepped up to 70A, pressure is currently at 4.17e-5 torr and coming up. 

Initiated auto-ramping at 0.5A/min for both TGHT and TBHT: good vac at 3.0e-5, bad vac at 4.0e-5 Torr.

 Wednesday, June 24, 2015, 00:03

Stopped auto-ramping about 2 hours ago.  

Manual stepped up TGHT to 73A.  Vac is stabilizing at 5e-8 Torr.  Will keep it at that current over night.

 Wednesday, June 24, 2015, 07:41

Vac has come down to 3.6e-6 Torr.

Continue to step up TGHT...

 Wednesday, June 24, 2015, 23:52

It has been a super long day operating the evaporator and finally the target is up to 1800C.  Vac is coming down from 2.e-5 Torr. 

TGHT is at 790A/12.61V, DV at 6.60V, TBHT at 230A/3.57V.  Omega temp reader is at 1680C - that's due to the window being coated with SiC, as expected. 

Target will continue heated at that current for over night, and will start the cooling process next AM. 

Thursday, June 25, 2015, 06:18  

Target is holding pretty well over night.  Vac is coming down to 1.6e-6 Torr. 

Initiated cooling down at 2A/min. 

 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.

 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. 

 Friday, July 31, 2015, 15:39

A Ta tube was coated with TaC.  The inner of the tube was filled with TaC solution and the excess was drained out to give a homogenous coating.  The outer layer of the tube was brushed with TaC. 

The tube is installed in a target boat and wrapped with 3 layers of heat shields.  

Chamber is currently pumped down and the target heater will be ramped up after the long weekend (Tue)

A new window port is installed (see photo).  TGHT will need to be ramped up slowly to make sure the new window can sustain the heat shine from the target - local check on the Evap is required to make sure it's safe to keep ramping up the heater.     

Tuesday, August 18, 2015, 15:53

Target consists of 505 discs.

Total packed length 3.4cm.

Total mass 75.2772g.

Re foil inserted.

3x Ta Heat shields.

No endcaps inserted.

Chamber currently pumping down.

TBHT will be ramped up to 230A at 1.0A/min.

TGHT will be ramped up to 1800C, auto ramp to 600A at 2.0A/min [estimated final value of 720A according to elog ID 184]

*Note: Turbo Pump is on low speed

 Wednesday, August 19, 2015, 10:15

IGP1 = 8.3e-7 Torr.

Tapped up manually to 35A.

Initiating auto-ramp.

Wednesday, August 19, 2015, 15:55  

IGP1 = 3.3e-6 Torr.

TBHT reached max setpoint of 230A

TGHT reached max setpoint of 600A

OMEGA = 1554C

Increasing final setpoint of TGHT to 700A and re-initiating auto-ramp.

Laura Lambert wrote:

Tuesday, August 18, 2015, 15:53 Target consists of 505 discs. Total packed length 3.4cm. Total mass 75.2772g. Re foil inserted. 3x Ta Heat shields. No endcaps inserted. Chamber currently pumping down. TBHT will be ramped up to 230A at 1.0A/min. TGHT will be ramped up to 1800C, auto ramp to 600A at 2.0A/min [estimated final value of 720A according to elog ID 184] *Note: Turbo Pump is on low speed  Wednesday, August 19, 2015, 10:15 IGP1 = 8.3e-7 Torr. Tapped up manually to 35A. Initiating auto-ramp. Wednesday, August 19, 2015, 15:55   IGP1 = 3.3e-6 Torr. TBHT reached max setpoint of 230A TGHT reached max setpoint of 600A OMEGA = 1554C Increasing final setpoint of TGHT to 700A and re-initiating auto-ramp.

 Wednesday, August 19, 2015, 17:13

TGHT reached to 700A/10.5V, direct voltage at 5.2V, and temp measured at both ends at 1755C.  Vac is coming down from 4.2e-6 Torr. 

Stepping up TGHT to reach 1800C

Wednesday, August 19, 2015, 17:22

Increased TGHT to 722A/11.3V (direct voltage at 5.48V) to reach 1800C (consistant with the heating curve as for the previous HPTa target, elog 184)

Will continue to condition the target at this temperature for overnight. 

Cooling down can be initiated tomorrow morning at 2A/min --- Please measure the target temperature from the new window port before cooling it down.