Monday, July 13, 2015, 11:53

A Ta foil is placed in the target boat with separate slots for each endcap [same as elog 200]

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

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

 Monday, July 13, 2015, 15:00

Opened HS water valves, no leaks detected.

IGP1 = 2.7e-6 Torr.

Tapping up manually.

 Monday, July 13, 2015, 15:41

Tapped up manually to 30A

TGHT = 30A, 0.05V

IGP1 = 7e-6 Torr.

Initiating auto-ramp at 0.2A/min up to 480A with a final desired temperature of 1800C

 Tuesday, July 14, 2015, 09:12

IGP1 = 7.8e-7 Torr

TGHT = 241A, 3.3V

OMEGA = 1010C

Increasing auto-ramp to 2.0A/min

 Tuesday, July 14, 2015, 11:12

Reached final setpoint of TGHT = 480A, 8.43V

OMEGA = 1667C

IGP1 = 3.3e-6 Torr.

Tapping up manually to reach final desired temperature of 1800C.

 Tuesday, July 14, 2015, 11:33

Reached TGHT = 500A, 8.8V by tapping up manually.

OMEGA = 1714V

IGP1= 3.5e-6 Torr.

Re-initiating auto-ramp at 2.0A/min with a final setpoint of 580A.

New final desired temperature min of 1900C

 Tuesday, July 14, 2015, 13:16

TGHT = 577A, 10.74V

OMEGA = 1938C

IGP1 = 3.2e-6 Torr

Endcaps have been at this temperature for just over an hour.

Spikes in vacuum started ~430A - this is due to the green TaC coating reacting with the Ta foil, the carbide is reacting directly with the Ta foil [see picture]

Stopping sintering early before endcaps break -> initiating auto-cool at 2.0A/min.

 Wednesday, July 15, 2015, 11:33

Vented in air and took out this morning.

Endcaps sintered on top side but not fully sintered on inner edge.

Inner edge is peeling off and unsintered green TaC.

The coating peeling off did not shrink, as seen with previous tests done, one would expect a shrinkage in the coating when heated.

The peeling is most likely due to the way to endcaps were placed  in the slots of the Ta foil.

This may have cause the foil to be hotter than the inside of the endcaps and subsequently the Ta foil and TaC coating on the inside reacted - with the Ta foil extracting the carbide from the coating.

This would cause the outer edges of the inside of the endcap to peel/curl inwards as it was heated [like a cast, as the cast dries the outer edges curl inwards].

See photos attached for clarification.

Endcaps will be re-coated and sintered again via a different procedure.

John Wong wrote:

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 04, 2015, 11:26

HS water valves opened, no leaks detected.

IGP1 = 2.2e-7 Torr.

Tapped up manually to 30A.

IGP1 = 2.7e-7 Torr.

Initiating auto-ramp at 0.2A/min with a final value of 350A.

 Tuesday, August 04, 2015, 15:30

IGP1 = 2.8e-6 Torr.

TGHT = 79A.

Increasing ramping rate to 0.5A/min

 Wednesday, August 05, 2015, 15:25

EVAP2 reached 350A this morning, OMEGA = 1414C

Temperature measurements were taken using the FLUKE IR camera of the new window port to be used for the second OMEGA camera.

Measurements were taken of both the Cu seal on the inside of the window and in the centre of the window [the hottest point].

TGHT was ramped up at 2.0A/min from 1414C --> 1800C with auto ramp paused at each measurement reading taken.

See attachment for raw data.

TGHT remained at 500A/1800C for 4hrs and will be cooled down at a rate of 2.0A/min.

 Thursday, August 06, 2015, 15:32

Vented and opened today.

New window port passed inspection, max temperature reached = 32.4C

Coating on tube looks good, partial sintering. Internal sintered better than outside of tube.

See attached photos.

 Thursday, August 06, 2015, 15:36

The endcaps are stacked together with a punched out disc of graphite foil placed in between each endcap for separation so endcaps won't fuse together.

The end caps are further wrapped in a larger piece of graphite foil to hold together as a tube [same method used in elogID # 158]

There are two separate tubes in the target boat:

1) endcaps coated with TaC coating - never been sintered

2) previously sintered [but not fully] endcaps with a second coating done on the one side of each endcap

The boat is wrapped with 3-layers of Ta heatshields.

Chamber is currently being pumped down.

 Friday, August 07, 2015, 08:45

HS water valves opened, no leaks detected.

IGP1 = 3.6e-7 Torr.

Tapped up manually to 30A.

 Friday, August 07, 2015, 11:23

IGP1 = 2.2e-6 Torr.

Vacuum stable.

Initiating auto-ramp at 0.2A/min with a final setpoint of 480A.

Will ramp up over the weekend, confirm temperature readings on monday and tap up to final desired temperature of 1800C manually.

 Friday, August 07, 2015, 13:04

Vacuum climbed quite fast.

IGP1 = 6.3e-6 Torr.

Stopped auto-ramp to allow vacuum to settle.

Waited ~1hr.

IGP1 = 4.3e-6 Torr.

Re-initiating auto-ramp.

 Monday, August 10, 2015, 09:22

TGHT reached 480A, 8.2V on the weekend.

OMEGA = 1708C

IGP1 = 3.8e-7 Torr.

Tapped up manually to 1803C, 520A, 9.0V

IGP1 = 5.9e-7 Torr.

 Monday, August 10, 2015, 14:50

EVAP2 remained at 1800C for 4.5hours.

Internal temperature taken at new window port read 1800C using the mikron.

Initiating auto-cool at 2.0A/min.

 Tuesday, August 11, 2015, 09:23

Vented in air and opened up this morning.

The following observations were noted:

1) single round sintered endcaps:

-Batch of green endcaps, single round of sintering look good. fully sintered.

-however when applying a scratch test, excess TaC scrapes off.

[see single round sintering photos]

-A few endcaps almost heated too long and started to appear brittle/ further crystallization on inside of endcap - the side that did not have a second coating applied.

-Outside of endcap looks good/ fully sintered - the side that had a second round of TaC coating

-further tests confirm this batch should still be okay to use

[see round2 batch photos]

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.

John Wong wrote:

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.

 Thursday, August 20, 2015, 08:27

OMEGA = 1830C

Internal temperature using Mikron taken from the second 'new' view port: Hottest point on target leg = 2250C; hottest point on target material discs inside container = 1830C.

IGP1 = 1.5e-6 Torr.

EVAP2 has been sitting at max setpoints for ~15hours.

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

 Tuesday, August 25, 2015, 11:50

Container coated with TaC using new method: Ends tapped off,  with liquid poured in and swirled around entire container, then poured back out - 'flushing technique'

Container is wrapped with 3 x Ta heat shields, not incl center block.

Loaded into EVAP2 and currently pumping down.

 Tuesday, August 25, 2015, 13:52

IGP1 = 2.2e-6 Torr.

HS water valves opened.

No leaks detected.

Tapped up manually to 35A.

Vacuum stable.

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

Final setpoints for TGHT = 720A and TBHT = 230A, with final desired temp of 1800C

 Wednesday, August 26, 2015, 09:56

IGP1 = 8.8e-7 Torr.

TGHT = 260A, 3.0V

TBHT = 145A, 1.8V

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

 Wednesday, August 26, 2015, 14:15

IGP1 = 3.5e-6 Torr.

TGHT = 720A, 11.3V

TBHT = 230A, 3.2V

DV = 5.48V

OMEGA RS [right side-old port] = 1745C

OMEGA LS [left side-new port] = 1880C

Tapping up manually to achieve 1800C on OMEGA RS

 Wednesday, August 26, 2015, 14:44

IGP1 = 3.7e-6 Torr.

TGHT = 748A, 11.9V

DV = 5.78V

OMEGA RS = 1803C

OMEGA LS = 1935C

Thursday, August 27, 2015, 07:31

 Remained at max setpoints for ~17hrs.

IGP1 = 1.3e-6 Torr.

DV = 5.79V

OMEGA RS = 1862 [this reading may not be correct due to the laser being moved at max setpoint - this temperature reading may be taken from a different location then the last reading]

OMEGA LS = 1955

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

John Wong wrote:

Tuesday, September 01, 2015, 17:16 Target container contains 533 discs of SiC with packed length of 17cm.  Mass of 533 discs SiC(green)  = 57.8979g Total mass SiC(green) + target container = 1455g Container is wrapped with 3 heatshields; no end caps are inserted yet. Sintering temp at 1800C - TGHT will be set accordingly.  TBHT max at 230A.  Chamber is currently being pumped down.

 Wednesday, September 02, 2015, 09:11

HS water valves opened, no leaks detected.

IGP1 = 1.15e-6 Torr

Tapped up manually to 40A.

Waited ~1hr40 for vacuum to stabilize.

IGP1 = 3.6e-6 Torr.

Max setpoints set to TGHT = 630A and TBHT = 230A, ~1400C

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

Once max setpoints achieved, will tap up manually until window port becomes coated [as previously observed]

Once window port becomes coated will leave at set temp for ~4hrs to continue with outgassing, then cool down, clean window and ramp back up.

If LS port still clean, will continue to ramp up to final desired temperature of 1800C.

 Wednesday, September 02, 2015, 14:23

IGP1 = 4.0e-5 Torr.

Vacuum too high, stopped auto-ramp and tapped down manually.

Dropped TGHT down from 80A to 50A

Dropped TBHT down from 55A to 50A

Wednesday, September 02, 2015, 15:29

Vacuum down to IGP1 = 1.2e-5 Torr.

Re-initiating auto-ramp...

 Tuesday, September 08, 2015, 10:04

IGP1 = 4.5e-7 Torr.

TGHT = 630A, 9.6V

TBHT = 230A, 3.2V

DV = 0.22V

OMEGA RS = 1476C

OMEGA LS = 1450C

see attached photo for screenshot.

will tap up manually with a visual on both window ports...

John Wong wrote:

John Wong wrote: Laura Lambert wrote: John Wong wrote: Tuesday, September 01, 2015, 17:16 Target container contains 533 discs of SiC with packed length of 17cm.  Mass of 533 discs SiC(green)  = 57.8979g Total mass SiC(green) + target container = 1455g Container is wrapped with 3 heatshields; no end caps are inserted yet. Sintering temp at 1800C - TGHT will be set accordingly.  TBHT max at 230A.  Chamber is currently being pumped down.     Wednesday, September 02, 2015, 09:11 HS water valves opened, no leaks detected. IGP1 = 1.15e-6 Torr Tapped up manually to 40A. Waited ~1hr40 for vacuum to stabilize. IGP1 = 3.6e-6 Torr. Max setpoints set to TGHT = 630A and TBHT = 230A, ~1400C Initiating auto ramp at a rate of 0.2A/min and 0.1A/min for the TGHT and TBHT respectively. Once max setpoints achieved, will tap up manually until window port becomes coated [as previously observed] Once window port becomes coated will leave at set temp for ~4hrs to continue with outgassing, then cool down, clean window and ramp back up. If LS port still clean, will continue to ramp up to final desired temperature of 1800C.  Wednesday, September 02, 2015, 14:23 IGP1 = 4.0e-5 Torr. Vacuum too high, stopped auto-ramp and tapped down manually. Dropped TGHT down from 80A to 50A Dropped TBHT down from 55A to 50A Wednesday, September 02, 2015, 15:29 Vacuum down to IGP1 = 1.2e-5 Torr. Re-initiating auto-ramp...  Tuesday, September 08, 2015, 10:04 IGP1 = 4.5e-7 Torr. TGHT = 630A, 9.6V TBHT = 230A, 3.2V DV = 0.22V OMEGA RS = 1476C OMEGA LS = 1450C see attached photo for screenshot. will tap up manually with a visual on both window ports...    Tuesday, September 08, 2015, 15:44 TGHT has stepped up to 820A.  Coating on both windows is becoming obvious and it's interfering the temp readers; however, the left window (see attachment, which is further away from the target) is lightly coated than the right.  See attachment for The Temp (and Power) vs current plots. Target will remained heated at the current and will be cooled down later today.    The target will be re-conditioned up to 820A and temp and mass will be re-measured. Plans: The chamber will be vented tomorrow and the target will be taken out to weigh for mass change.  The chamber windows will need to be clean. A piece of Ta foil will be cover in front of the ionizer to trap any loss material (if any).  Tuesday, September 08, 2015, 17:37 TGHT was at 800A for 2 hours before ramping up 820A for another 2 hours heating.  More coating on the right window is observed and temp reading came down to 1340C.  The left window remains the same and temp reads at 1646C.   Ramping TGHT/TBHT to 0A at 2A/min and 1A/min, respectively.    Wednesday, September 09, 2015, 12:27 Result after the sintering process: No yellow crystal formed (compared to previously observed SiC targets that heated up above 1900C).  Total green mass = 57.90g  mass of graphite foil = 0.035g x 533 discs = 18.7g  mass of green SiC = 39.30g  Target container with SiC before sintered = 1455g  Target container after sintered = 1450g  mass loss ~ 5.0g ~ 13% organic mass, as expected!   The target will undergo the re-condition stage, and the temperature will be measured from 600A to 820A.     Wednesday, September 09, 2015, 17:39 Both end-caps are inserted onto the targets.  The total mass (Target, Sintered SiC, end caps, 4x 19"round graphite foils) = 1453g. Target is wrapped with 3 layers of heat shields.   The extraction electrode is wrapped with Ta-foil (see attachment).  This is to trap any lose particle, if any.   Chamber is currently being pumped down, currently at 1.2e-5 Torr.

 Thursday, September 10, 2015, 09:55

HS water valves opened this morning, no leaks detected.

TGHT and TBHT tapped up manually to 35A.

IGP1 = 4.4e-7 Torr, vacuum stable.

Initiating auto-ramp at 1.0A/min and 0.5A/min for the TGHT and TBHT respectively with final setpoints of 600A and 230A.

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, 12:03

Vacuum spiking rapidly.

Stopped auto-ramp, tapped TGHT and TBHT down manually, allowing vacuum to stabilize.

IGP1 = 3.5e-6 Torr.

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

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

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.

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.

 Tuesday, November 10, 2015, 14:20

Container previously sintered with TaC coating and temperature measurements taken [see elog ID# 256, 257, 258]

3x Ta heat shields

2 packs of 5 SiC discs ~2inches from the end of the right side wrt ionizer tube into page.

Loaded into evap2 and currently pumping down.

see photos attached.

 Monday, November 16, 2015, 11:24

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

Tapped up manually to 35A.

Vacuum stable.

IGP1 = 3.4e-7 Torr.

Initiating auto-ramp at 1.0A/min and 0.5A/min for the TGHT and TBHT respectively.

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

Monday, November 16, 2015, 13:29

Vacuum too high.

IGP1 = 2.9e-5 Torr.

Decreasing ramping rate down to 0.5A/min and 0.2A/min for the TGHT and TBHT respectively.

 Tuesday, November 17, 2015, 09:12

IGP1 = 1.45e-7 Torr.

TGHT = 250A, 3.28V

TBHT = 230A, 3.33V

OMEGA = 1194C

Tapping up manually to 1900C

 Tuesday, November 17, 2015, 11:22

Tapped up manually to 1800C, realized SiC should only be tapped up to 1700C, backed off immediately down to 415A from 460A/ 1800C.

See attachment for photo of striptool/ time spent above 1700C [~20min].

 Tuesday, November 17, 2015, 15:46

TGHT remained at 1700C for ~4hrs.

TGHT = 420A, 6.44V.

IGP1 = 2.3e-7 Torr.

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

See attachment for raw data of temperature measurements.

 Wednesday, November 18, 2015, 13:32

Vented in air and took out this morning.

Looks good, no visual changes with the container.

Monday, November 23, 2015, 14:29

No heat shields.

Container empty.

Loaded into evap2 and currently pumping down.

 Tuesday, November 24, 2015, 09:36

HS water valves opened this morning, no leaks detected.

IGP1 = 4.5e-7 Torr.

Changed slope of OMEGA IR to 0.98 for empty container.

Tapped up manually to 35A.

IGP1 = 4.7e-7 Torr.

Vacuum stable, initiating auto-ramp at 2.0A/min and 1.0A/min for the TGHT and TBHT respectively.

Final setpoints: TBHT = 230A, TGHT = 300A

Will tap up manually to 2000C

 Tuesday, November 24, 2015, 14:00

TGHT = 300A, 3.75V

TBHT = 230A, 3.08V

IGP1 = 4.7e-7 Torr

No reading yet on the OMEGA.

Re-initiating auto-ramp to final setpoint TGHT = 450A

 Wednesday, November 25, 2015, 09:11

IGP1 = 3.0e-7Torr.

TGHT = 450A, 6.37V

Tapping up manually to 2000C

 Wednesday, November 25, 2015, 15:31

container was tapped up manually to 650A, slope/emissivity settings were checked.

ramped back down to 450A and tapped up manually while recording data up to 1800C [legs = 2000C]

once reached 1800C, tapped TBHT down manually to see relation of TBHT to temperature/ TGHT

remained at 1800C for ~1hr [while tapping down TBHT] before initiating auto-cool at 2.0A/min for the TGHT

see attachment for raw data.

 Thursday, November 26, 2015, 10:08

Vented in air and took out this morning.

 Monday, November 30, 2015, 15:37

No heat shields.

Container empty.

Loaded into evap2 and currently pumping down.

Tuesday, December 01, 2015, 10:07 

HS water valves opened this morning, no leaks detected.

IGP1 = 4.3e-7 Torr.

Slope of OMEGA = 0.98

Tapped up manually to 35A.

Vacuum stable, initiating auto-ramp at 2.0A/min and 1.0A/min for the TGHT and TBHT respectively.

Final setpoints: TBHT = 90A, TGHT = 360A

Once final setpoints reached, will tap up manually to max 1800C [legs = 2000C]

 Monday, December 07, 2015, 09:06

Container was tapped up manually with emissivity measurements taken every 50A starting at 360A.

The final measurement was taken at 640A.

Container was ramped down for the weekend.

See attachment for raw data.

 Monday, December 07, 2015, 09:04

No heat shields.

Container empty.

IGP1 = 1.1e-7 Torr.

Slope of OMEGA = 0.98

Tapped up manually to 35A.

Vacuum stable, initiating auto-ramp at 2.0A/min and 1.0A/min for the TGHT and TBHT respectively.

Final setpoints: TBHT = 90A, TGHT = 360A

Will tap up with the same parameters as last round to confirm results.

 Friday, December 11, 2015, 11:44

Took out of evap2 yesterday.

Aurelia took many emissivity measurements to compare with previous data - which matched up.

The dip in emissivity before going up again around ~560A could be due to oxidation of the materials.

 Wednesday, December 16, 2015, 10:09

Target consists of 505 discs.

Total packed length 3.4cm.

*same parameters at Ta#46*

Total mass of target materials 53.9381g [4 packs of 20 with Ta wire + 425 single discs].

3 x Ta Heat shields.

No Re foil inserted.

No endcaps inserted.

Chamber pumped down overnight.

IGP1 = 5.1e-7 Torr.

Tapped up manually to 35A.

IGP1 = 5.2e-7 Torr.

Vacuum stable, initiating auto-ramp.

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 239]

 Wednesday, December 16, 2015, 15:08

TBHT reached max setpoint of 230A, 3.3V

TGHT = 600A, 8.9V

IGP1 = 1.1e-6 Torr.

OMEGA = 1543C

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

 Wednesday, December 16, 2015, 16:02

TGHT = 700A, 10.6V

IGP1 = 2.1e-6 Torr.

OMEGA = 1740C

Tapping up manually to 1800C.

 Wednesday, December 16, 2015, 16:28

TGHT = 730A, 11.2V

Vacuum is coming down from IGP1 = 2.6e-6 Torr.

OMEGA = 1800C

Will condition the target at 1800C overnight and ramp down in the morning.

 Thursday, December 17, 2015, 09:31

OMEGA = 1802C on right side

Temp on leg of left side = 2150C, the hottest point - measured with the Mikron pyrometer.

 Friday, December 18, 2015, 08:53

Evap2 remained at 1800C for ~26.5hrs

Auto-ramped down to TGHT = 300A and TBHT = 90A at a rate of 2.0A/min and 1.0A/min respectively.

Conditioning complete.

TGHT will be ramped up later today for emissivity measurements.

 Monday, January 04, 2016, 11:21

the following was performed by aurelia.

emissivity measurements were taken late december.

evap2 was cooled down and left under vacuum over the xmas break.

currently ramping back up for more emissivity measurements.

 Friday, January 08, 2016, 10:47

Aurelia done measurements.

vented and opened this morning.