John Wong wrote:

John Wong wrote:  Wednesday, September 07, 2016, 14:45 Container was previously coated with TaC solution and wrapped with 1-full length layer of Ta- heat shield around the fins.   Chamber is being pumped down.  Vac at 5.6e-7 Torr before HS water valves were open; no leaks were detected.  Sintering Temperature 1900C (Omega slope @ 0.98); expected TGHT ~765A/11.90V, TGHT max at 230A.  Thursday, September 08, 2016, 18:14 At about 1600C, it was observed that the coating inside the tube seems to chip off (see attachment 1). TGHT was ramped up to 745A/11.85V and TBHT to 230A/3.25V.  Temperature measured on OMEGA/Mikron = 1914C/1881C; both instruments slopes set at 0.98. Will remain at this TGHT current over night Vac at 3.0e-6 Torr and coming down. Friday, September 09, 2016, 11:01  Target has been heated at the stable temperature at 1914C (for OMEGA) and 1881C (for Mikron) with current at 745A/11.94V (see attachment 2) for almost 19 hours.  No fluctuation in p/s current or temperature was observed.  The ramping up process is captured and can be view from the link below: https://www.dropbox.com/sh/9lgtin54o17ds6j/AABn1-XjvK44mm74TjqTAmvta?dl=0 Pressure at 1.07e-6 Torr.  Cooling down TGHT at 2A/min and TBHT at 1A/min.  Continue to capture the cooling down process.   Friday, September 09, 2016, 15:17  While the target container was cooling down, the chip-like particle began obvious (see attachment 3).   Will inspect the container.. TGHT currently at 260A.    Monday, September 12, 2016, 16:54 The TaC coating chipped off from the surface and didn't get sintered with the container.  (See attachment1).  There are a few possible reasons why this happened: 1.  The coating was too think.  This may cause the TaC  layer to curl up while the heater was ramped up.  2.  The coated material got brittle.  The container was flushed with TaC (probably a few weeks ago?) before it went through the sintering process.  Prolong exposure to air/light usually degrade the polymers viscoelasticity. 3.  TaC solution has got bad.  The particles can agglomerate over time and this can cause uneven surface. 4.  Combination of all... ??? Anyway, the chipped off TaC layer was gently scraped off with a stainless steel rod.  Then using kimwipes, i was able to remove most of the chipped off coating; it was not easy - especially trying to remove it from the inner tube. Instead of "flushing" the tube with TaC, I decided to spray it with thin layer.  And using the air supply, I could quickly dry the coating and installed it back to the evaporator for 2nd Round sintering as we are approaching the deadline! .

 Monday, September 12, 2016, 17:24

Chamber was pumped down to low 10e-6 Torr before HS water valves were open - no leaks detected.

TGHT/TBHT auto ramped at 2A/min to 600A/230A.

Will continue to monitor..

 Wednesday, September 14, 2016, 17:04

TGHT was stepped up to 700A and temp 1851C (OMEGA), 1930C(Mikron).  (see attachment 1).  The container was heated over night before it was cool down at 2A/min. 

Target container seems to properly sintered with TaC (see attachment 2); it will be used for SiC#35. 

 Tuesday, June 20, 2017, 15:58

Target consists of 470 discs.

Total packed length 3.4cm [exactly 7.8cm space on both sides]

Total mass 50.3105g [Incl foils + Ta wire on 6 packs]

Target consists of 350 single discs and 6x20 packs of Ta discs

Discs in target are arranged as follows: 1pack / 75singles / 1pack / 100singles / 2packs / 100singles / 1pack / 75singles / 1pack

1 long Ta Heat shield.

No endcaps inserted, no Rh foil inserted.

Chamber currently pumping down.

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

TGHT will be ramped up to 600A at 2.0A/min.

Final desired temperature = 1900C

OMEGA slope = 0.98

Vacuum limit stop at 3.0e-5 Torr, backing off at 4.0e-5 Torr.

*Note: container accidentally engraved with WO#412218-6 when it should be WO#42218-6

Wednesday, June 21, 2017, 10:05 

HS water valves opened, no leaks detected.

Tapped up manually to 40A, vacuum stable.

IGP1 = 5.53e-7 Torr

IGP2 = 4.35e-7 Torr

Initiating auto-ramp.

 Wednesday, June 21, 2017, 14:48

TGHT stopped at 575A due to voltage limit sitting at 9V

Increased max setpoint of voltage to 14V.

Re-started auto-ramp starting at 575A.

Wednesday, June 21, 2017, 15:23  

TGHT = 600A, 8.95V

TBHT = 230A, 3.72V

IGP1 = 1.55e-6 Torr

IGP2 = 1.62e-6 Torr

OMEGA = 1538C

Increasing max setpoint of TGHT to 700A

 Wednesday, June 21, 2017, 16:21

TGHT = 700A, 10.57V

TBHT = 230A, 3.75V

IGP1 = 2.2e-6 Torr

IGP2 = 2.4e-6 Torr

OMEGA = 1730C

Increasing max setpoint of TGHT to 750A

 Friday, June 23, 2017, 15:41

TGHT = 780A, 11.77V

TBHT = 230A, 3.77V

IGP1 = 4.8e-7 Torr

IGP2 = 4.8e-7 Torr

OMEGA = 1890C

Conditioning process complete.

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

 Monday, June 26, 2017, 10:51

Target vented in air and removed from evap2 today.

Endcaps inserted.

Target looks good!

 Friday, September 15, 2017, 09:44

Target consists of 470 discs.

Total packed length 3.4cm [exactly 7.8cm space on both sides]

Total mass g [Incl foils + Ta wire on 6 packs]

Target consists of 350 single discs and 6x20 packs of Ta discs

Discs in target are arranged as follows: 1pack / 75singles / 1pack / 100singles / 2packs / 100singles / 1pack / 75singles / 1pack

1 long Ta Heat shield on each side, not incl center block.

No endcaps inserted, no Rh foil inserted.

Loaded into evap2 yesterday.

Chamber pumped down overnight.

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

TGHT will be ramped up to 650A at 2.0A/min.

Final desired temperature = 1900C

OMEGA slope = 0.98

HS water valves were already open.

Tapped up manually to 40A, vacuum stable.

IGP1 = 1.1e-6 Torr

IGP2 = 7.8e-7 Torr

Initiating auto-ramp.

Vacuum limit stop at 3.0e-5 Torr, backing off at 4.0e-5 Torr.

 Monday, September 18, 2017, 08:38

TGHT = 647A, 10.04V

TBHT = 233A, 3.51V

IGP1 = 4.65e-7 Torr

IGP2 = 3.78e-7 Torr

OMEGA = 1700C

Increasing max setpoint of TGHT to 750A

 Monday, September 18, 2017, 14:49

TGHT = 760A, 11.96V

TBHT = 233A, 3.54V

IGP1 = 8.9e-7 Torr

IGP2 = 8.6e-7 Torr

OMEGA = 1905C

Conditioning process complete.

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

 Tuesday, September 19, 2017, 10:38

Target was cooled down in sections so Yasser could take some temperature measurements with his thermocouples.

Vented in air and removed from evap2 this morning.

Target looks good.

Endcaps inserted and expanded.

Inserting Rh foil this afternoon.

 Tuesday, September 26, 2017, 10:53

Tapped up manually to 230A over the course of ~35min.

TBHT striptool = 228A, 0.33V

TBHT direct readout = 230.4A, 0.33V

Vacuum good/ stable.

Minor spike to IGP1 = 1.5e-5 Torr ~5min after reached max setpoint of 230A.

IGP1 striptool = 3e-6 Torr

IGP1 direct readout = 3.79e-6 mBar

Initiating auto-cool at 2.0A/min.

 Ta#56 HP-SIS target description:

Total Ta foils = 470 [6x20 packs + 350 single discs]

Foil Thickness = 0.025mm

Target density = 14.01 g/cm3

Target length = 3.4 cm

Total Mass = 47.374 g [Incl foils + Ta wire on 6 packs]

Total mass w/ Target oven= 1469 g

Discs in target are arranged as follows: 1pack / 75singles / 1pack / 100singles / 2packs / 100singles / 1pack / 75singles / 1pack

Thursday, June 21, 2018, 11:430: Ta#56 loaded into Evap 2 

Thursday, June 21, 2018, 11:37: Roughing

Thursday, June 21, 2018, 11:48 : Turbo pump started.

Thursday, June 21, 2018, 11:56 : Turbo pump at speed

Monday, June 25, 2018, 08:00: Vacuum @ 3.35e-07T

Monday, June 25, 2018, 08:05: TGHT/TBHT Power supplies switched on.

Monday, June 25, 2018, 09:35: Vacuum @ 3.23e-07T. Manually bump up TGHT to 40A.

Slope found / set.

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

TGHT will be ramped up to 650A at 2.0A/min.

Final desired temperature = 1900C

OMEGA slope = 0.98

Monday, June 25, 2018, 11:41: Auto-ramping TGHT / TBHT @ 2 / 1 A per min to 300 / 180 A 

Monday, June 25, 2018, 13:28: Check: Vacuum @ 1.08e-06T. TGHT / TBHT @ 248 / 110 A

Monday, June 25, 2018, 13:50: TGHT ramping halted momentarily. Limit increased to 350 A, continue ramping.

Monday, June 25, 2018, 14:44: Check: Vacuum @ 1.08e-06T. TGHT / TBHT @ 350 / 180 A. (hold till am)

Omega: 1033 deg C

Tuesday, June 26, 2018, 08:37: Vacuum @ 3.03e-07T. Auto-ramping TGHT / TBHT @ 2 / 1 A per min to 600 / 230 A . Omega: 1010 deg C (approx)

Tuesday, June 26, 2018, 11:25: Vacuum @ 1.34e-06T. TGHT / TBHT @ 248 / 110 A. Omega: 1605 deg C (approx) 

Auto-ramping TGHT  @ 2 A per min to 650 A

Tuesday, June 26, 2018, 12:06: Limited at 608A ? Display still ramping past the auto-ramp limit. 

Tuesday, June 26, 2018, 12:24 : Auto ramp halted. Display brought to 610 A. Readback 603 A

Tuesday, June 26, 2018, 12:41: Voltage limit adjusted to 12.00V. Mnaualy increased TGHT to 620 A. Auto-ramping TGHT  @ 2 A per min to 650 A

Tuesday, June 26, 2018, 12:59: Check: Vacuum @ 1.53e-06T. TGHT / TBHT @ 650 / 230 A. 

Omega: 1747 deg C

Tuesday, June 26, 2018, 15:07: Check: Vacuum @ 9.73e-07T. TGHT / TBHT @ 650 / 230 A. (hold till am)

Omega: 1760 deg C

Wednesday, June 27, 2018, 07:49: Check: Vacuum @ 5.06e-07T. TGHT / TBHT @ 650 / 230 A.

Omega: 1796 deg C. Begin auto-ramping TGHT to 700 A @ 2 A per min with pause at 675 A. Monitor.

Wednesday, June 27, 2018, 08:00: Check: Vacuum @ 5.80e-07T. TGHT / TBHT @ 675 / 230 A.

Omega: 1843 deg C. Begin auto-ramping TGHT to 700 A @ 2 A per min. Monitor.

Wednesday, June 27, 2018, 08:16: Vacuum @ 7.45e-07T. TGHT / TBHT @ 700 / 230 A. Omega: 1890 deg C (approx). 

Wednesday, June 27, 2018, 08:23: Vacuum @ 8.53e-07T. TGHT / TBHT @ 707 / 230 A. TGHT Voltage= 10.783V. Omega: 1906-1913 deg C. Desired temperature = 1900C reached.

Wednesday, June 27, 2018, 13:11: Vacuum @ 6.77e-07T. Omega: 1902-1915 deg C

Wednesday, June 27, 2018, 14:53: Begin auto-cooling TGHT / TBHT @ - 2 / -1 A per min overnight. 

Thursday, June 28, 2018, 07:39: Power supplies off. Turbo pump off.  

Thursday, June 28, 2018, 09:38: Vented. Remove From Evap 2.

Monday, March 9, 2020, 03:15

Container coated with TaC and wrapped with 3 Ta heat shields.

Desired temperature= 1900 C, Omega Slope set = 0.990, Auto TGHT at 0.2A/min to reach 400A, TGHT will be tapped up accordingly to reach desired Temp.

TBHT will be set fixed at 230 A (max).

Good vac at 3.00e -5 Torr

Bad vac at 5.00e-5 Torr

Chamber pump down

Tuesday, March 10, 2020, 09:17

Starting manual ramp to 50 A @ approximately 2A/min

IGP1 = 3.73e-7 Torr after opening water line pressure slowly incresed to 4.4e-7 Torr

TBHT also has Chiller interlock reached out to controls for removal.

Tuesday, March 10, 2020, 10:47

Chiller Interlock removed for TBHT.   Started manual ramp to 50A @ approximately 2A/min

Tuesday, March 10, 2020, 11:15

allowing to stabilize at 50A on TGHT and TBHT

IGP1= 7.9 e=7 Torr and trending up

Tuesday, March 10, 2020, 12:09

Pressure on IGP1 spiked.  Allowing to stabilize.

Tuesday, March 10, 2020, 14:36: Stopped By to check. Vacuum @ 3.02e-03T. Turbo pump appears to have tripped. Shut off Both PS. Prepare to vent. - Aaron S.

Tuesday, March 10, 2020, 14:48: Tightened all fittings (Just in case). HS side & HS waterline at the feed through. Roughing. 

Tuesday, March 10, 2020, 15:06: TP1 @ 38KRPM 1.34e-04T & dropping.  TGHT & TBHT PS on. Monitor before heating. -AS

Wednesday, March 11, 2020, 06:25: Vacuum @ 3.39e-07T. TGHT / TBHT PS on. - AS

Wednesday, March 11, 2020, 06:26: Manually tapped up TGHT / TBHT to 10 / 10 A. Ok.

Wednesday, March 11, 2020, 06:28: Auto-ramping TGHT / TBHT @ 4 A per min to 50 / 50 A.

Wednesday, March 11, 2020, 07:07: Vacuum @ 3.64e-07T. TGHT / TBHT @ 50 A. All appears stable. - AS

Wednesday, March 11, 2020, 07:036

Started autoramp  at 2 A/min

IGP1= 3.6e-7 Torr

Wednesday, March 11, 2020, 08:06

TGHT=10 5A, 1.3 V       TBHT = 105 A, 1.2 V

pressure rising fast; manual ramp down to 95A on both TGHT and TBHT

 Wednesday, March 11, 2020, 09:54

 IGP1= 4.7e-6 Torr; TGHT = 93.1 A, 1.2 V; TBHT = 95.1 A, 1.1 V

start autoramp at 1A/min (0.5 A/30s)

IGP1= 1.28e-5 Torr

TGHT = 108.3 A, 1.44 V

TBHT = 110 A, 1.29 V

Stop autoramp

Wednesday, March 11, 2020, 10:25

IGP1= 5.9e-5 Torr

manually tapped TGHT and TBHT set-current to  105 A respectively. 

pressure dropping.

Wednesday, March 11, 2020, 11:18

IGP1=8.0e-06 Torr

manually ramp to set-current 115 A for both TGHT and TBHT at approximately 2A/ min

allow to stabilize before proceeding

Wednesday, March 11, 2020, 12:12

IGP1=7.02e-6 Torr

TGHT = 112.7 A, 1.5 V

TBHT = 114.6 A, 1.4 V

Auto-ramping at 1A/min TGHT to 430 A and TBHT top 230A

 Wednesday, March 11, 2020, 18:45

IGP1= 1.2 e-06 Torr

TGHT=421.8 A, 6.2 V

TBHT = 231.9 A, 3.1 V

auto-ramp TGHT at 1A/min to set-current 530A

Wednesday, March 11, 2020, 23:08

IGP1= 1.3e-6 Torr

TGHT= 519.9 A, 7.87V

TBHT = 232.0 A, 3.1 V

start autoramp TGHT to 600A at  1A/min

Wednesday, March 11, 2020, 23:36

IGP1= 1.6e-6 Torr

TGHT = 542.9 A, 8.2V

TBHT = 232.9 A, 3.1V

Set autoramp to 750A on TGHT at 0.5 A/min

Thursday, March 12, 2020, 06:55

The Voltage set on TGHT was too low so current had not increased

IGP1= 1.5e-6 Torr

TGHT = 640 A, 10V

TBHT 232/9A, 3.1V

Oncrease TGHT voltage set to 14.5 and start autoramp at 3A/min to 750 A

Thursday, March 12, 2020, 7:43

TGHT = 735.7 A, 11.8V

OMEGA = 1595C

Auto -ramp set to 780 A for TGHT

Thursday, March 12, 2020, 7:58

OMEGA = 1655 C

TGHT set to 800 A at 3A/min

Thursday, March 12, 2020, 9:42

OMEGA =  1704 C

TGHT = 789.5 A, 13.0 V

Manual tap up to 837 A set on TGHT and 821 A readback

Thursday, March 12, 2020, 10:00

TGHT readback = 821.0 A, 13.7 V

OMEGA = 1744 C

TBHT same as previous entry.

 Thursday, March 12, 2020, 10:35

 Tapped up TGHT to 832.6 A, 13.8 V

OMEGA = 1759 C

TBHT = 232.9 A, 3.6 V

Will not tap further. 

Thursday, March 12, 2020, 13:22

IGP1 = 5.0 e-06 Torr (stable)

TGHT = 832.7 A readback (849 A set), 13.7V

TBHT = 232.9 A, 3.6 V

OMEGA = 1758 C

Start cooling at TGHT 3A/min

 Thursday, March 12, 2020, 14:08

IGP1= 1.32e-06 Torr

TGHT = 706 A, 11.0 V

TBHT = same as previous

OMEGA = 1583C

Start cooling TBHT at 1A/min continue cooling TGHT at 3A/min

Friday, March 13, 2020, 08:18

IGP1= 3.9e-8 Torr

Will unload sintered container

Friday, March 13, 2020, 13:52

Total number of foils: 493

Total length packed 17.4 cm

container has 3 Ta heat shields.

No endcaps inserted to facilitate out-gassing

Two TaC coated Ta wire springs inserted at both ends.

Initially to ramp TGHT and TBHT to 50A at 1A/min

Then heat manually to OMEGA ~1400 C , ramping TGHT manually and automatically  to reach 530A A (Omega slope set = 0.990)

Then temperature = 1800 (C using slope 1.08 at after 1700C manually and automatically ramp to 700A then  TGHT will be tapped up accordingly to reach desired Temp).

TBHT will be set fixed at 230 A (max).  TBHT heated manually and automatically to max.

Good vac at 3.00 e -5 Torr

Bad vac at 5.00 e-5 Torr

Evaluation discs not included because no space.

Total Green disc mass measured = 58.78 g

Friday, March 13, 2020, 14:22

Container loaded and pressuring down started without any pump issues.

Friday, March 13, 2020, 23:26

IGP1= 9.1e-07 Torr

Start auto tap at .25A/min to 50A on both TBHT and TGHT

Saturday, March 14, 2020, 07:09

IGP1=6.9e-6 Torr

TGHT = 49.1 A, 0.58V

TBHT = 49.2A, .49V

Continue ramp to 80 A on both heaters at .0.25A/min (good vacuum 3.0 e-04 Torr, bad vaccum 5.0 e-04 Torr

Saturday, March 14, 2020, 08:22

IGP1=6.8 e-05 Torr

Pressure spike TGHT =63.7 A, 0.77 V; TBHT = 60.0 A , 0.62 V

Aborted ramp alow to stabilize (Tapped TBHT to 63.8 A

Saturday, March 14, 2020, 12:16

IGP1= 8.1e-05 Torr

start autoramp at 0.25A/min

Saturday, March 14, 2020, 17:47

IGP1= 2.9e-05 Torr

TGHT= 78.4A, 1.0 V

TBHT = 79.4A, .88 V

manual and automatic  tap up to 740A TGHT and 230A TBHT then tap manually to 1800 C (mostly at .075 A/min and increasing to 1A /min as pressure stabilizes)

Sunday, March 15, 2020, 22:40

OMEGA = 1711 C

TGHT = 784,6 A, 12.9V (readback)

TBHT = 232 A, 3.5 V

Tap TGHT to 800 A readback set to 815A

Sunday, March 15, 2020, 23:20

OMEGA =1801 C

TGHT = 799.2 A, 13.3 V, TBHT = 232.9, 3.6V

Start gradual tap-down as temperature rising (1810 C at end of this note)

Sunday, March 15, 2020, 23:49

OMEGAA = 1818 C

TGHT = 769.9A, 12.6 V; TBHT = 232.9 A, 3.6 V

Temperature dropping tapped back up to 799 A on TGHT read back (set to 815 A)

Monday, March 16, 2020, 04:10

OMEGA = 1395 C (not reliable)

TGHT = 799.2 A, 13.2 V

TBHT = 232.9 A, 3.6 V

IGP1 = 2.2 e-06 Torr

Initiate cooling at -1.5 A/min on TGHT to 600A (at 600 A increase cooling rate to 3 A/min ; at 300 A increase cooling to 4 A/min and start TBHT cooling at 1 A/min; at `200 A on TGHT increase cooling to 4 A/min and TBHT 2 A/min)

Monday, March 16, 2020, 09:43

TGHT = 0 A , 0.02V

TBHT = 53,2 A, .56 V  (increase cooling to 4 A/min)

IGP1= 1.12e-07 Torr

Monday, March 16, 2020, 10:37

IGP1= 9.5 e -8 Torr

TGHT and TBHT = 0A, 0V

Will unload container

Monday, March 16, 2020, 12:40

Ten discs removed for evaluation (6 from left side and 4 from right side)

two graphite discs placed at each end as well as two TaC coated and sintered end-caps

total length after sintering = 17.8 cm

 Monday, June 15, 2020, 13:30

Container coated with TaC and wrapped with 3 Ta heat shields.

Desired temperature= 1900 C, Omega Slope set = 0.990, Auto TGHT at 0.2A/min to reach 400A, TGHT will be tapped up accordingly to reach desired Temp.

TBHT will be set fixed at 230 A max).

Good vac at 3.00e -5 Torr

Bad vac at 5.00e-5 Torr

Chamber pump down

Wednesday, April 28, 2021, 11:54

Total number of foils: 449 (not including analysis discs)

Total length packed 16.7 cm

5 extra analysis discs and 2 dr. Blade discs

container has 3 Ta heat shields.

No endcaps inserted to facilitate out-gassing

One Ta disc inserted at front end

Initially to ramp TGHT and TBHT to 50A at0.5 A/min

Then heat manually to OMEGA ~1400 C , ramping TGHT manually and automatically  to reach 530A A (Omega slope set = 0.990)

Then temperature = 1800C

TBHT will be set fixed at 230 A (max).  TBHT heated manually and automatically to max.

Good vac at 3.00 e -5 Torr

Bad vac at 5.00 e-5 Torr

Thursday, April 29, 2021, 10:09

IGP1 = 6.5 e-07 Torr

Start heating at 0.5 A/min to 50 A on both TGHT and TBHT 

Thursday, April 29, 2021, 21:45

 IGP1= 7.7 e-06 

TGHT = 50.3A , 0.59 V

TBHT = 49.4 A, 0.56 V

Pressure is taking a while to equilibrate.  Will wait a bit more to continue heating

Thursday, April 29, 2021, 23:49

IGP1 = 7.2 e-06 Torr

will start ramping at 0.5 A/min to 100 A 

Saturday, May 01, 2021, 20:09 

Friday, April 30, 2021, 08:19

IGP1 pressure higher than bad vacuum.  Stopped autoramp.  Will allow vacuum to come back down and restart ramp. 

Saturday, May 01, 2021, 09:04

Yesterday the system had tripped.  All pumps had turned off and the pressure was found at 0.005 torr

vacuum was restarted.

 Current IGP1= 6.5e-07 Torr

Restarting heaters.  

Autoramp at 0.5A/min to 20A on both TGHT and TBHT

Saturday, May 01, 2021, 10:48

IGP1=5.9e-7 Torr

TGHT = 20.0 A, 0.24V

TBHT = 20A, 0.20V 

 Autoramp at 0.5A/min to 40A both TGHT and TBHT

Saturday, May 01, 2021, 13:26 

TGHT = 40.0 A, 0.47 V

TBHT= 39A, 0.44V

IGP1= 5.5 e-07 Torr

Autoramp at 0.5A/min to 60 A on both TGHT and TBHT

Saturday, May 01, 2021, 20:09

TGHT = 60.0 A, 0.72V

TBHT = 59.4 A, 0.69V

IGP1= 4.4e-07 Torr

Autoramp at 0.5A/min to 100 A on both TGHT and TBHT

Sunday, May 02, 2021, 18:30 

IGP1= 1.7 e-06 Torr

TGHT =100A, 1.3V

TBHT = 99.9A, 1.3V

Autoramp both heaters at 0.25A/min to 120A and monitor 

Sunday, May 02, 2021, 18:45

pressure increase to 4.1e-06 Torr.  TBHT unexpectedly rose to 120A and was manually tapped back down to 104 A.  Will keep both , TGHT and TBHT, at 104 A  for a while. 

Sunday, May 02, 2021, 19:50

Stepping at 0.5A/min to 105A then to 110 A on both TGHT and TBHT

Sunday, May 02, 2021, 22:10 

Will leave both TGHT and TBHT at 110 A until pressure comes back down

currently IGP1= 1.3e-05 Torr

Monday, May 03, 2021, 09:35 

IGP1= 2.2 e-06 Torr

Tapping TGHT and TBHT to 115A 

Monday, May 03, 2021, 11:30

 Tapping TGHT and TBHT to 120A @ 1A/min

Monday, May 03, 2021, 18:38

IGP1= 5.4e-06 Torr

TGHT = 130.3 A, 1.8 V

TBHT = 129.1 A, 1.8 V

Continue gradual ramping at 1A/min in increments of 5 A 

Tuesday, May 04, 2021, 09:27

IGP1= 3.2e-5 Torr

TGHT = 400 A, 6.0V

TBHT = 232 A, 3.6V

OMEGA = 1104 C

waiting for pressure to drop then will continue heating 

Tuesday, May 04, 2021, 17:27

TGHT = 420.1 A, 6.5V

TBHT= 232A, 3.6V

OMEGA = 1139 C

IGP1= 1.15e-5 Torr 

will increase ramp up at 0.5A/min to 430A and hold (TGHT)

Tuesday, May 04, 2021, 22:43

TGHT= 430A, 6.6V

TBHT = 232.8A, 3.6V

OMEGA= 1157 C

IGP1=6.6e-6 Torr

 Set Autoramp at 0.5A/min to 540 A (TGHT)

Wednesday, May 05, 2021, 08:09

IGP1= 7.5e-06 Torr

TGHT = 534 A, 8.5V

TBHT=232 A, 3.7 V 

OMEGA = 1485

Continue ramp at 0.5A/min to to 600 A on TGHT

Wednesday, May 05, 2021, 15:07

IGP1=1.2e-5 Torr

TGHT=601A, 9.6V

TBHT= 232A, 3.7V

OMEGA =1600 C

ramp to 650A on TGHT at 0.5A/min 

Wednesday, May 05, 2021, 20:05

Tapped TGHT to 694A, 11.4 V (manually)

TBHT= 232A, 3.7V

OMEGA =  1790 C

IGP1= 2.5e-05 Torr

Will monitor Pressure and temperature .  Will start 4 hour count.

Wednesday, May 05, 2021, 22:03

OMEGA = 1765 C 

TGHT = 694A, 11.5V

TBHT = 232A, 3.8 V

IPG1= 1.6e-05 Torr

Manually bumping TGHT to 700 A

Wednesday, March 01, 2023, 21:46

Ta HP-SIS was coated with TaC and wrapped with Ta heat-shields (3 layers + 1 inner layer around fins)

Desired temperature = 1850 C , TBHT will be set fixed at 230A (max).

Evap 2 will be pumped down over previous night

OMEGA slope= 0.990

Good vacuum = 5.00 e-4 Torr

Bad vacuum = 5.00 e-2 Torr

IGP1= 5.7 e-07 Torr

Start autoramp @1A/min to 500 A on TGHT and 230A TBHT. 

Thursday, March 02, 2023, 10:10

ramping to 600A on TGHT @ 2A/30s, TBHT at 230A, 3.2V

Thursday, March 02, 2023, 11:22

At 11 am reached 1800s C and 1851C @1120 am. 

TGHT = 690 A, 10.5V

TBHT = 230 A, 3.3V

Cool down to start at 3 pm

Monday, March 06, 2023, 21:29

Total number of foils:382 ( including 5 analysis discs on the right side of the container)

Total length packed 17 cm (excluding 5 analysis discs that will be removed)

container has 4 Ta heat shields (one inner only around fins)

No endcaps inserted to facilitate out-gassing

Ta coated spring at  both ends

ramp to 500A @ 1A/min TGHT and to 230A on TBHT

max approx 700A on TGHT and 230A on TBHT (Omega slope set = 0.990)

Then temperature = 1800C

TBHT will be set fixed at 230 A (max).  TBHT heated manually and automatically to max.

Good vac at 5.00 e -4 Torr

Bad vac at 5.00 e-2 Torr

 IGP1= 3e-06 Torr at start of initial ramp.

Tuesday, March 07, 2023, 07:23

IGP1= 1.2e-05 Torr

OMEGA = 1288 C

Tuesday, March 07, 2023, 10:01

Will ramp to 715 A and keep there for 4 hours.  OMEGA readings not reliable beyond this point due to coating on EVAP2 window.

Tuesday, March 07, 2023, 11:10

TGHT = 715A, 11.0V

TBHT = 230A, 3.2V

OMEGA = 1750 C (but not reliable)

Maintaining for 4 hours then will ramp down @ -2A/min TGHT and -1A/min TBHT

Wednesday, March 08, 2023, 07:27

Final IGP1= 1.3e-07 Torr (before shutting down pumps)

Sunday, March 12, 2023, 08:04

Ta HP-SIS was coated with TaC and wrapped with Ta heat-shields (3 layers + 1 inner layer around fins)

Desired temperature = 1850 C , TBHT will be set fixed at 230A (max).

Evap 2 will be pumped down over previous night

OMEGA slope= 0.990

Good vacuum = 5.00 e-4 Torr

Bad vacuum = 5.00 e-2 Torr

IGP1=1.9 e-07 Torr

Start autoramp @2A/min to120 A on TGHT and TBHT.

OMEGA target temp = 1850 C

Sunday, March 12, 2023, 13:08

start autoramp to 500A on TGHT @ 4A/min (2A/30s)

from 320A, 4.5 V on TGHT

IGP1= 6.8e-07 Torr

Sunday, March 12, 2023, 19:09

Starting ramp down @ -2A/min TGHT, and -1A/min TBHT

@687A, 10.7 V TGHT OMEGA = 1850 C

final pressure IGP1= 2.4e-06 Torr

Monday, March 13, 2023, 22:28

Total number of foils:380 ( including 5 analysis discs on the front side of the container)

Total length packed 17 cm (excluding 5 analysis discs that will be removed)

container has 4 Ta heat shields (one inner only around fins)

No endcaps inserted to facilitate out-gassing

Ta coated spring at  both ends

ramp to 500A @ 1A/min TGHT and to 230A on TBHT

max approx 700A on TGHT and 230A on TBHT (Omega slope set = 0.990)

Then temperature = 1800 C.  Will ramp to 1820 C

TBHT will be set fixed at 230 A (max).  TBHT heated manually and automatically to max.

Good vac at 5.00 e -4 Torr

Bad vac at 5.00 e-2 Torr

 IGP1= 2.8e-06 Torr at start of initial ramp.

Tuesday, March 14, 2023, 07:26  

Increased autoramp to 2A/min to 700 A on TGHT while keeping TBHT to 230A, 3.3V

Tuesday, March 14, 2023, 09:53

At 743A, 11.8V TGHT

OMEGA = 1780 C.  (not entirely reliable, will leave at this current for 4 hours)

Tuesday, March 14, 2023, 14:00

Starting rampdown at -2A/min on TGHT and -1A/min TBHT

Final IGP1= 5.5e-06 Torr

OMEGA= 1750C

TBHT= 230A, 3.3V

Tuesday, September 12, 2023, 09:51

The coated container was wrapped in 3 Ta foil heatshield and left in evap2 over night to attain vacuum.

Target temperature on OMEGA= 1850-1900 C

OMEGA slope:= 0.990

Target time at max temperature = 4 hours

Final Current TBHT= 230 A

Final TGHT current= ~700A (adjustable)

Heating autoramp starged at 1A/min on  TGHT  and TBHT to 120A

Then at 2 A/min  to =400 A TGHT and 230A TBHT

Good vacuum = 5.0 e-04 Torr

Bad vacuum = 5.0E-02 Torr

Initial IGP1= 2.7e-06 Torr

Tuesday, September 12, 2023, 7:00

Started autoramp @1A/min to 120A on both TGHT and TBHT

Tuesday, September 12, 2023, 09:53

Heating ramp set to 230A for both TGHT and TBHT.  Rate at 2A/min for both heaters.

Tuesday, September 12, 2023, 11:21

Continued ramp on TGHT at 2A/min to 335A and now setting to 3A/min (1.5A/30s)

Tuesday, September 12, 2023, 11:47

Continue ramping @3A/min on TGHT

 Tuesday, September 12, 2023, 13:33

Reached 1840 C at TGHT =677A and 10.5V

Will keep for 4 hours

Thursday, December 14, 2023, 09:53

Target left pumping down in Evap2 overnight. 

Initial weight including protective jig = 1474.3 g

Total number of target foils:388 

 10 analysis discs: 5x 220727-2 labelled as A and 5x 231123-2 labelled as B on the right side (front) of container.  Order of discs ABABABABAB.

Total length packed 15.5 cm

container has 3 Ta heat shields including the inner made of three pieces as to cover the center block.

No endcaps inserted to facilitate out-gassing

Ta coated spring at  both ends

ramp to 500A @ 1A/min TGHT and to 230A on TBHT

max approx 700A on TGHT and 230A on TBHT (Omega slope set = 0.990)

Then temperature = 1800C

TBHT will be set fixed at 230 A (max).  TBHT heated manually and automatically to max.

Good vac at 5.00 e -4 Torr

Bad vac at 5.00 e-2 Torr

 IGP1= 9.3e-07 Torr at start of initial ramp.

Thursday, December 14, 2023, 09:56

Started initial ramp up 1A/min on both heaters

Thursday, December 14, 2023, 11:03

Pressure dropping.  Will increase ramp speed to 2A/min on both heaters (1A/30s)

Thursday, December 14, 2023, 11:17

pressure dropping.  Increase ramp to 4A/min (2A/30s)

Will stop and ramping for temperature measurements

Thursday, December 14, 2023, 13:28

Increased ramp to 5A/min (2.5A/30s)

 Will heat to 703A on TGHT and leave for 4 hours

 Monday, April 29, 2024, 19:50

Started coating with coating stand.

The coated container was wrapped in 3 Ta foil heatshields.

Vacuum IGP1 initial =9.1 e-07 Torr

Target temperature on OMEGA= 1850-1900 C

OMEGA slope:= 0.990

Target time at max temperature = 4 hours

Final Current TBHT= 230 A

Final TGHT current= ~700A (adjustable)

Heating autoramp starged at 2A/min(1A/30s) on  TGHT  100A

Then at 2A/min  to =700 A TGHT and 230A TBHT

Good vacuum = 5.0 e-04 Torr

Bad vacuum = 5.0E-02 Torr

Monday, April 29, 2024, 20:25

Reached 1810 @700A

Will leave until 1230am

Wednesday, May 01, 2024, 11:53

The coated container was wrapped in 4 Ta foil heatshields.

Vacuum IGP1 initial =8.1 e-06 Torr

Target temperature on OMEGA= 1850-1900 C

OMEGA slope:= 0.990

Target time at max temperature = 4 hours

Final Current TBHT= 230 A

Final TGHT current= ~500A (adjustable)

Heating autoramp starged at 3A/min(1A/30s) on  TGHT  100A

Then at 2A/min  to =400 A TGHT and 230A TBHT

Good vacuum = 5.0 e-04 Torr

Bad vacuum = 5.0E-02 Torr

Wednesday, May 01, 2024, 22:19

1830C reached at 670A. 10.0V TGHT

Start cooling after 4 hours. 

Thursday, January 30, 2025, 09:17

Left to pump down on previous night

The coated container was wrapped in 4 Ta foil heatshields.

Vacuum IGP1 initial =8.1 e-06 Torr

Target temperature on OMEGA= 1850-1900 C

OMEGA slope:= 0.990

Target time at max temperature = 4 hours

Final Current TBHT= 230 A

Final TGHT current= ~500A (adjustable)

Heating autoramp starged at 0.5A/min(1A/120s) to 60A on both TGHT and TBHT

Then at 0.5A/min  to 90 A, both TGHT and 230A TBHT

When pressure stable will ramp at 2A/min to ~500A on TGHT and 230A on TBHT

Good vacuum = 5.0 e-04 Torr

Bad vacuum = 5.0E-02 Torr

Thursday, January 30, 2025, 09:20

currently ramping to 90A

Thursday, January 30, 2025, 12:30

Ramping to 120A @ 0.5 A/min

Thursday, January 30, 2025, 13:59

Ramping to 140 A at 1A/min (to check pressure change.  So far with slower heating, pressure has not spiked very high).

Thursday, January 30, 2025, 15:59

Started ramping @ 2A/30s to 500 A on TGHT

TBHT is at 230A

Thursday, January 30, 2025, 21:25

Target was sintered when OMEGA reading 1700-1750 C

At 640-660A on TGHT RD

Check target coating and repeat these setting if good.

Thursday, January 30, 2025, 21:43

Cooling started at -2A/min on TGHT and -1A/min TBHT

Saturday, February 01, 2025, 09:23

The coated container was wrapped in 4 Ta foil heatshield and left in evap2 over night to attain vacuum.

Target temperature on OMEGA= 1850-1900 C

OMEGA slope:= 0.990

Target time at max temperature = 4 hours

Final Current TBHT= 230 A

Final TGHT current= ~650A (adjustable)

Heating autoramp starged at 1A/min on  TGHT  and TBHT to 120A

Then at 2 A/min  to =400 A TGHT and 230A TBHT

Good vacuum = 5.0 e-04 Torr

Bad vacuum = 5.0E-02 Torr

Initial IGP1=5.6e-07Torr

Saturday, February 01, 2025, 11:05

@ 194A, 2.5V on TGHT, the pressure is dropping (has been dropping since 150A).  starting ramp at 4a/min

Thursday, February 13, 2025, 11:40

Log entries lost as computer rebooted.  Max temperature on OMEGA was 1850 C and held for 4 hours.  Cooled @ -2A/min TGHT and -1A/min TBHT.

 Monday, October 25, 2021, 11:52

Ta IGLIS tube was coated with TaC and wrapped with Ta heat-shields (3 layers)

Desired temperature = 1900 C (expected TGHT ~430 A), TBHT will be set fixed at 230A (max).

Evap 2 will be pumped down over previous night

Good vacuum = 3.00 e-3 Torr

Bad vacuum = 5.00 e-2 Torr

Initial total weight = 439.0 g

Final weight after sintering = 438.8 g

Tuesday, October 26, 2021, 07:18 

IGP1= 9.2 e-07 Torr

Will ramp to 50A at 1A/min on both TGHT and TBHT.

Tuesday, October 26, 2021, 08:37 

IGP1= 3.0 e-05 Torr

TGHT= 50.2 A, 0.6 V

TBHT = 49.4 A, 0.5 V

Will allow pressure to drop further then start further ramp up

Tuesday, October 26, 2021, 14:36

TGHT =  100 A, 1.3 V

TBHT = 99 A, 1.0 V

IGP1 = 3.e-5 Torr

ramp up TGHT to 400 A and TBHT to 230 A at 1.5 A/ min

Tuesday, October 26, 2021, 18:46 

 Will keep at 430A on TGHT and 230A on TBHT for 4 hours.

OMEGA reading = 1653  C is suspicious based on previous coating.  

Tuesday, October 26, 2021, 23:05

TGHT = 430.5 A, 6.9 V

TBHT = 232.09A, 2.8 V

IGP1= 8.8e-06 Torr

Start cooling THGT at -2A/min and TBHT at -1A/min 

 Thursday, May 11, 2017, 11:21

Turns out SiC HP-FEBIAD that has finished conditioning is loaded in the wrong container and it should be a SiC HP-FEBIAD cold transfer line...so rush on new target.

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

Container is wrapped with 1x heatshield around each side of cooling fins, not incl center block.

Loaded into EVAP2 and currently pumping down.

 Thursday, May 11, 2017, 13:40

IGP1 = 1.85e-6 Torr.

HS water valves opened.

No leaks detected.

Tapped up manually to 35A.

Vacuum stable.

IGP1 = 3.2e-6 Torr

IGP2 = 4.2e-6 Torr

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

Final setpoints for TGHT = 450A and TBHT = 230A, with final desired temp of 1900C

OMEGA slope = 0.98

 Friday, May 12, 2017, 07:57

IGP1 = 4.3e-7 Torr.

IGP2 = 4.4e-7 Torr

TGHT = 233A, 2.8V

TBHT = 130A, 1.6V

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

 Friday, May 12, 2017, 08:54

Comparing direct readouts with epics:

IGP1: direct = 1.9e-6 Torr; epics = 1.3e-6 Torr

IGP2: direct = 1.55e-6 Torr; epics = 1.4e-6 Torr

TGHT: direct = 320A, 4.38V; epics = 321A, 4.19V

TBHT: direct = 181A, 2.40V; epics = 178A, 2.34V

 Friday, May 12, 2017, 10:28

IGP1 = 1.07e-6 Torr

IGP2 = 1.15e-6 Torr

TGHT = 450A, 6.37V

TBHT = 230A, 3.21V

OMEGA = 1197C

Increasing max setpoint of TGHT = 700A

 Friday, May 12, 2017, 13:06

IGP1 = 2.4e-6 Torr

IGP2 = 2.5e-6 Torr

TGHT = 696A, 11.21V

TBHT = 233A, 3.26V

OMEGA = 1758C

Increasing max setpoint of TGHT = 800A

 Friday, May 12, 2017, 13:32

TGHT maxed out at 715A but continued ramping.

This was noticed when current set of TGHT = 750A but readout = 715A

This is due to max voltage limit = 12.0V and readout =11.58V

Increasing TGHT max setpoint to 14.0V and restarting auto ramp from 714A

 Friday, May 12, 2017, 14:45

Container has reached max setpoint of ~1900C

TGHT setpoint = 775A

TGHT = 769A, 12.54V

TBHT = 233A, 3.28V

IGP1 = 2.94e-6 Torr

IGP2 = 2.99e-6 Torr

OMEGA = 1912C

Will remain at max setpoint over weekend.

See attached photos of temperature measurements using MIKRON while TGHT current set point = 770A.

Photos are not super accurate but good as a rough idea.

Ex. for left side the point in the camera is actually pointed slightly closer to the end of the container but in the photo it looks more centered.

Saturday, May 13, 2017, 10:52 by Anders

Ramping down heaters. Temp 1912 C. Vacuum IGP1 = 5.4e-7 Torr

Monday, May 15, 2017, 13:10

Vented in air and taken out this a.m.

Target container looks good. 

Fully sintered coating.