Wednesday, March 13, 2019, 15:41

An uncoated tantalum tube was loaded with a graphite insert (with conical caps).

3 tantalum foils were wrapped around the tantalum tube and a Ta cap was added.

EVAP2 is currently pumping down

The tube will be hated for 5 days at 2000 C

Thursday, March 14, 2019, 10:07

IGP1 = 5.37e-7 Torr

The TGHT will be tapped manually to 50 A  

After aprox 1 hour IGP1 = 5.08e-7 Torr, TGHT=46.5 A, 0.224 V

Autoramp is set to 1A/min to 300 A

 Autoramp is set to 1A/min to 450 A

Autoramp was stopped at 425 A when 2000 C were achieved

 Sunday, March 17, 2019, 00:25

IGP1 = 2.03e-7 Torr

TGHT=424.2 A, 7.117 V, temp 1976 C

Sunday, March 17, 2019, 15:04 

IGP1 = 21.6e-7 Torr

TGHT=424.1 A, 7.085 V, temp 1967 C

cooling down -1 A/min

 Wednesday, January 23, 2019, 13:01

A previously coated tantalum tube with 3 layers of shielding (Details in e-log 426) was loaded with a graphite insert. 

The tube was loaded in evaporator 2 and pumped down

The graphite insert will be heated to 2000 C for 3 weeks

 Thursday, January 24, 2019, 10:04

Pressure = 3.66e-7 Torr

TGHT manually tapped to 45 A

Final pressure = 3.8e-7 Torr

Set autoramp to 350 A @ 2A/min

TGHT = 1643 C

Set autoramp to 400 A @ 2A/min

TGHT = 1790 C

Started to tapped manually at approx 5 A every 30 s

Final TGHT => 1896 C, 8.16 V, 480.46 A

The current will stay at 480 A until temperature stabilizes. 

The current was reduced to 476 A to stay at 1900 C

Friday, January 25, 2019, 17:16

Pressure = 3.22e-7 Torr

TGHT = 8.17 V, 477.65 A, 1882 C 

Monday, January 28, 2019, 09:09 

Pressure = 1.67e-7 Torr

TGHT = 8.07 V, 477.65 A, 1859 C 

The temperature readings are fluctuating between 1880 and 1859 C

Tuesday, January 29, 2019, 07:32

Pressure = 1.55e-7 Torr

TGHT = 8.17 V, 477.75 A, 1880 C 

Tuesday, January 29, 2019, 11:34

 Pressure = 1.55e-7 Torr

TGHT = 8.27 V, 477.56 A, 1897C 

Tuesday, January 29, 2019, 12:47 

 Pressure = 1.53e-7 Torr

TGHT = 8.19 V, 477.75 A, 1899C 

Tuesday, January 29, 2019, 13:38

 Pressure = 1.55e-7 Torr

TGHT = 8.25 V, 477.75 A, 1905C

Thursday, January 31, 2019, 16:12  

 Pressure = 1.40e-7 Torr

TGHT = 8.4 V, 476.81 A, 1918C

Thursday, January 31, 2019, 22:32

Pressure = 1.39e-7 Torr

TGHT = 8.37 V, 476.71 A, 1914C

The current will be ramped down @1 A/min

Friday, February 01, 2019, 09:58

 Last 22 A tapped to 0 manually

Tantalum tube was removed from the EVAP2

 Thursday, November 22, 2018, 10:12

A previously sintered tantalum tube with 3 layers of shielding was loaded with a graphite insert.

The tube was loaded in evaporator 2 on Wednesday 21/11/2018 and pumped down

The graphite insert will be heated to 2000 C

current pressure IGP1 =  4.2e-7 Torr

TGHT manually tapped to 40 A

Autoramp set to 2 A/min on TGHT to 400 A aiming for 1800 C

 Thursday, November 22, 2018, 17:13

TGHT 401.25 A, 6.79 V

Temperature 1780 C

IGP1 7.89e-7 Torr

Tapping manually to reach 1800 C, final current 407.2 A, 6.96 V

  Friday, November 23, 2018, 17:13

 Tuesday, December 04, 2018, 07:53

TGHT 469.1 A, 8.814 V

Temperature 1983 C

IGP1 1.52e-7 Torr

Wednesday, December 05, 2018, 21:30

 TGHT 469.1 A, 8.75 V

Temperature 1983 C

IGP1 1.22e-7 Torr

Thursday, December 06, 2018, 12:25

 TGHT 468.9 A, 8.66 V

Temperature 1977 C

IGP1 1.42e-7 Torr

Friday, December 07, 2018, 17:59

  TGHT 468.9 A, 8.80 V

Temperature 1977 C

IGP1 1.42e-7 Torr

Wednesday, December 12, 2018, 12:18 

TGHT 469.2 A, 8.7 V

Temperature 1945 C

IGP1 1.10e-7 Torr

Thursday, December 13, 2018, 10:42

TGHT 469 A, 8.7 V

Temperature 1939 C

IGP1 1.04e-7 Torr

Ramping temperature down at -2 A/min

 Friday, December 14, 2018, 10:42

TGHT 0.0 A, 0.051 V

IGP1 4.36e-8 Torr

 Friday, November 02, 2018, 17:33

A new LP-FEBIAD was coated and syntered (e-log 421 Evaporator_2) 

The container was loaded with an empty graphite insert.

Graphite insert mass = 24.1724 g

A current of 440 A TGHT and 230 A TBHT will be inputed to the container

EVAP2 currently pumping down

 Saturday, November 03, 2018, 08:04

IGP1 = 5.66e-7 Torr

Tapping manually to 40 A on TGHT and TBHT

Then auto/ramp wiill be set to 2 A/min on TGHT and 1 A/min on TBHT

Maximum temperature achieve 1802 C

 Tuesday, November 06, 2018, 14:49

Container has reduced and increased its temperature from ~1760 to 1802 C.

IGP1  3.44e-7 Torr

TGHT 441.7 A and 7.7 V

TBHT 233.2 A and 3.2 V

 Wednesday, November 07, 2018, 08:32

Temperature 1785 C

IGP1  2.90e-7 Torr

TGHT 441.38 A and 7.7 V

TBHT 233.2 A and 3.2 V

 Friday, November 09, 2018, 17:26

Temperature 1787 C

IGP1  2.12 -7 Torr

TGHT 442.03 A and 7.7 V

TBHT 233.06 A and 3.19 V

Tuesday, November 13, 2018, 14:13: Turbos, power supplies off. Prepare for venting. 

 Thursday, November 23, 2017, 14:54

Graphite insert loaded into previously TaC coated target boat.

One endcap removed to allow for outgassing: left side out, right side in.

Weight of graphite tube + single endcap = 10.2012g

Same Ta heats shields remain on container from sintering TaC coating.

Currently pumping down in evap2.

Friday, November 24, 2017, 11:31

IGP1 = 4.52e-7 Torr

IGP2 = 3.43e-7 Torr

OMEGA slope = 0.98

Good vac at 3.0e-4, bad vac at 8.0e-4 Torr.

HS water valves have remained open since the last time evap2 was used.

No leak check done.

Tapped up manually to 50A.

Vacuum stable.

IGP1 = 5.34e-7 Torr

IGP2 = 5.54e-7 Torr

Initiating auto ramp for TGHT @ 0.2A/min to a max setpoint of 300A

Once max setpoints achieved, will tap up manually to final desired temperature of 2000C

Uranium targets go to a max temperature of 1950C online, so graphite insert should be tested to 2000C

 Monday, November 27, 2017, 10:15

IGP1 = 2.5e-7 Torr

IGP2 = 1.9e-7 Torr

Reached 300A, 4.61V

OMEGA = 1298C

Tapped up manually to 485A, 8.46V

OMEGA = 1808C

Remained at this setpoint for a day

Tuesday, November 28, 2017, 15:41 

IGP1 = 3.88e-7 Torr

IGP2 = 3.58e-7 Torr

Tapping up to 2000C...

Tuesday, November 28, 2017, 16:10 

TGHT = 570A, 10.20V

OMEGA = 2005C

IGP1 = 9.64e-7 Torr

IGP2 = 1.05e-6 Torr

There was a minor drop in voltage at 540A, 9.58V - dropped to ~9.4V then slowly went back up to 9.58V [see photo]

Will remain at this setpoint overnight and cool down in the a.m.

 Wednesday, November 29, 2017, 08:48

Voltage increased slowly while sitting at max setpoint of 570A [see photo]

TGHT = 570A, 11.20V --> voltage increased by 1.0V over ~16.5hrs

OMEGA = 2114C

IGP1 = 6.6e-7 Torr

IGP2 = 6.5e-7 Torr

Initiating auto-cool at 2.0A/min

 Wednesday, November 29, 2017, 16:15

Vented in air and removed today.

Will update tomorrow with results and photos.

 Wednesday, April 17, 2019, 09:03

An uncoated target container was loaded with a graphite insert and wrapped with 3 tantalum layers,

Two Ta caps were used

EVAP2 was pumped down, IGP1 = 5.14e-7 Torr

 The TGHT and TBHT current was tapped to 40 A manually

Autoramp was set to TGHT 1A/min to 500 A

and TBHT 0.5A/min to 230 A.

The temperature reached 2000 C as planned 

the target container stayed at that temperature for 1 week.

Tuesday, April 23, 2019, 10:00

EVAP2 was vented and the target container was removed.

The container crystalized but did not break.

Friday, May 24, 2019, 15:26

 A graphite insert with tantalum wires in its caps

was loaded in a tantalum tube, the system will be heated to 2000 C

and after 6 hrs at that temperature, it will be cooled and heated to 2000 C again.

The temperature will be hold at 2000 C for a 6 days.

Currently the chamber is being evacuated.

 Saturday, May 25, 2019, 06:01

IGP1 = 2.2e-7 Torr

Manually tapping to 50 A

Autoramp set to 1 A/min to 400 A

Saturday, May 25, 2019, 13:37

The autoramp was set to 450 A

Then it was manually tappe to 475 A 

Thursday, June 6, 2019, 16:43

A graphite insert with tantalum wires in its caps was loaded in a tantalum tube.

The system will be heated to 2000 C again (see elog 446)

Currently the chamber is being evacuated.

Friday, June 7, 2019, 16:40

Autoramp was set to 450 A at 1A/min to reach 2000 C

The temperature will be hold at 2000 C for a 4 days.

Tuesday, June 11, 2019, 16:46 

Autoramp is set to -2 A/min to 0 A

Wednesday, June 12, 2019, 17:01 

The tube present sever crystallization but is not broken and has some resistance against pressure.

Wednesday, August 28, 2019, 06:00

A graphite insert (with conical caps) was loaded in tantalum tube 

the Ta tube was wrapped with 3 tantalum foils,

a tantalum cap was inserted in one side of the Ta tube and sealed.

The tube was set in the EVAP2 and the furnace was pumped down.

IGP1 = 1.23e-6 Torr.

The current was tapped to 50 A

Autoramp was set to 1 A/min to 400 A.

 Wednesday, August 28, 2019, 12:02

Autoramp reached 400 A

TGHT = 6.57 V, 404.4 A, IGP1=4.7e-6 Torr

Autoramp was set to 450 A at 1A/min

 Wednesday, August 28, 2019, 12:48

Autoramp reached 450 A

TGHT =7.526 V, 450.188 A, IGP1=5.88e-6 Torr

Autoramp was set to 500 A at 1A/min

Wednesday, August 28, 2019, 13:40

Autoramp reached 500 A, temperature 1880 C

TGHT =8.79 V, 501.094A, IGP1=7.48-6 Torr

Autoramp was set to 540 A at 1A/min 

Wednesday, August 28, 2019, 14:03

The autoramp was stopped at 520 A, because according to previous tests that current is enough to have 2000 C,

the temperature read was 1930 C

TGHT =9.23 V, 520.7 A, IGP1=7.8-6 Torr

Wednesday, August 28, 2019, 15:20

The autoramp was set to 540 A at 1A/min

When the ramp stopped the conditions were:

TGHT=9.59 V, 539.5 A, IGP1= 6.08e-6 Torr

Temperature= 1988 C

Manually tapped to 545 A the temperature reached 2000 C

Wednesday, August 28, 2019, 17:08 

To keep the temperature at 2000 or less the current was decreased,

TGHT= 8.91 V, 445.125 A, IGP1=9.93e-7 Torr

Max temperature read: 2001 C

Min temperature read: 1996 C

Tuesday, September 03, 2019, 11:15

The tube was stable at 1950-1960 C during the weekend but today at around 6 am it had a drop in the current indicating mechanical failure 

The autoramp was set to -2A/min to 0 A. 

The tube will be examined and in case that it is not broken it will be set in the EVAP1 to continue heating it.

Monday, September 09, 2019, 16:35  

The tube became brittle and broke.

Aaron Schmidt wrote:

Wednesday, August 07, 2024, 15:36: Roughing. Had initially been roughed & TP started w/ Marla CS, however it timed out. Restarting. Wednesday, August 07, 2024, 15:37: TP on. Wednesday, August 07, 2024, 15:46: Tripped at 4 KRPM. Restarted. Up to 5 KRPM. Failed to start. Thursday, August 08, 2024, 10:00: TP started.  Thursday, August 08, 2024, 10:12: TP Tripped but nearly spun up. Reset & Restarted. TP Green / on.

Thursday, August 08, 2024, 10:43

A cartridge was filled with graphite foils and loaded in an uncoated tantalum tube. The tube was wrapped with four Ta-sheets. A Ta-foil was placed in the tube's right end for measuring the temperature.

Good vacuum 3e-5 Torr

Bad vacuum 5e-5 Torr

Initial IGP1 = 5.06E-7 Torr

Starting ramp at 1A/min to 200 A

Friday, August 09, 2024, 09:40 Pressure started to rise, but temperature is not within pyrometer range yet. Current 42 A, Voltage 0.5 V

Friday, August 09, 2024, 10:46 Pressure started to reduce (peak 1.4e-5 Torr). Temperature is not within pyrometer range yet Current 100 A, Voltage 1.3 V

Friday, August 09, 2024, 11:28 Temperature started to be detected, but not stable enough. Current 135 A, Voltage 1.9 V

Friday, August 09, 2024, 12:54 Temperature 1129 °C, current 196 A, voltage 3 V.

Friday, August 09, 2024, 12:56

Next ramp 0.5A/min while taking temperature readings periodically until 250A

Friday, August 09, 2024, 14:45

IGP1 = 1.0e-6 Torr

Next ramp 1A/min to 480 A aiming at 2000 °C

Friday, August 09, 2024, 17:13

IGP1 = 1.9e-6 Torr, Current 327A, Voltage 5.3V

Ramp changed to 2A/min to 480 A aiming at 2000 °C

Coolded down after 4 hours at ~2000°C

at -2A/min

 Tuesday, May 21, 2019, 17:57

A tantalum tube previously coated with TaC and sintered was loaded with graphite foils.

The mass of the foils was 20.04 g.

The system will be heated to 2000 C to find out the corresponding current.

After that the tantalum tube will be trasferred to the EVAP1

and it will be heated there for 5 days. 

EVAP2 currently pumping down

 Thursday, May 23, 2019, 05:48

IGP1 = 2.516e-7 Torr

Manually tap to 50 A

Autoramp set to 1 A/min to 400 A

Thursday, May 23, 2019, 13:09 

IGP1 = 3.78e-6 Torr

TGHT = 6.4 V, 401.3 A

Temperature reading = 1629

Thursday, May 23, 2019, 13:09

Autoramp was set to 550 A at 1 A/min 

Stopped at 530 A

Thursday, May 23, 2019, 21:27

IGP1 = 6.77e-7 Torr

TGHT = 9.2175 V, 507.375 A

After 6 hours at ~2000 C the autoramp was set to -2 A/min to 0 A 

Friday, May 24, 2019, 8:46

EVAP2 was vented with air and the tantalum tube was removed, examined and transferred to EVAP1

Tuesday, November 24, 2020, 09:23

A batch of 60 discs of 18 mm diameter were loaded in a tantalum tube. The tantalum tube was wrapped with 3 layers of Ta foil for heat shielding and mounted in the EVAP2. EVAP2 pumped down overnight and Aaron made a leak test this morning (elog 524). 

The target material will be heated to 1990 degC. To measure the temperature, the tube has a Ta foil close to the graphite foils and it is held in place with a tantalum spring. Another Ta spring holds the graphite foils in the opposite side of the tube. The temperature will be measured with the Omega pyrometer (slope 0.99)

IGP1 = 6e-7 Torr. Note: The pressure has an usual behavior (see 2020-11-24-IGP1  and 2020-11-24IGP1-zoom out). After ~9 hrs, the pressure became stable (see 2020-11-24IGP1 -stable)

Tuesday, November 24, 2020, 13:00

IGP1 = 6.7e-7 Torr

Good vacuum of 3e-2 Torr and Bad vacuum 5e-2 Torr

The autoramp is set to 80 A at 1 A each 10 s 

 Tuesday, November 24, 2020, 13:43

IGP1 = 2.7e-5 Torr

TGHT = 1.13 V 80.5 A

Autoramp is set to to 100 A at 1 A each 20 s

Tuesday, November 24, 2020, 13:57 

IGP1 = 2.5e-5 Torr and going down

TGHT = 100.2 A, 1.47 V

Autoramp is set to to 120 A at 1 A each 20 s

Tuesday, November 24, 2020, 14:06 

IGP1 = 2.09e-5 Torr

TGHT = 1.6 v, 122 A

Autoramp is set to 200 A at 2 A each 10 s

Tuesday, November 24, 2020, 14:18 IGP1 = 5.4e-5 Torr

IGP1 = 1.5e-5 Torr

TGHT = 2.9 V, 200.5 A

Omega = 1123 °C

Autoramp is set to 450 A, conditions:

2 A each 10 s with a good vacuum of 3e-2 Torr and a bad vacuum 5e-2 Torr 

Tuesday, November 24, 2020, 14:45

The autoramp was stopped at 424 A 

TGHT = 421.65 A, 8.353 V

IGP1= 2.5e-5 Torr and going down

Omega 2020 degC

The TGHT current was reduced to 420 A (8.27 V) and the temperature reduced to 2007 degC

Tuesday, November 24, 2020, 21:03

IGP1 = 2.09e-6 Torr

TGHT = 7.899 V, 421.312 A

Temperature = 1870 degC

Autoramp is set to 0 A at 1 A/min 

Friday, December 02, 2022, 09:46

297 graphite discs packed into a Ta tube wrapped in four heatshields.

Good vacuum 5.0e-04 Torr

Bad vacuum 5.0 e-02 Torr

Will be conditioned @ 2000 C for 5 hours and then for one hour at 10A greater than final current.  Final current will be calculated from

regression.

 IGP1= 5.7 e-07 Torr

ramping to 40A @ 2A/min TGHT

Friday, December 02, 2022, 20:59

Was ramped to 320A but the window must be coated because Temperature readings are drastically off. Will cool down and repeat on Monday after cleaning window.  Will ramp down at -2A/min

OMEGA= 1360 C, expect much higher.

Tuesday, December 06, 2022, 10:58

ramp started at 4A/min .  Initial pressure was 2.6 e-07 Torr

Tuesday, December 06, 2022, 12:45

OMEGA readings low (1290 @ 331A, 5.6V )

Will tap up until pressure bump observed.

Tuesday, December 06, 2022, 13:04

 Pressure bump observed around 440 A, 7.9 V

IGP1= 8.4 e-06 Torr. 

Current stopped and will keep at this current for 10 hours (11 pm rampdown)

Tuesday, December 06, 2022, 13:24

Ramped to 500A, Will leave at 500A for the rest of the conditioning.

Tuesday, December 06, 2022, 23:05

Starting rampdown at -2A/min

IGP1= 4.9e-07 Torr

TGHT= 500A, 9.3V

Wednesday, December 07, 2022, 09:43

Dismounting today.

IGP1 final = 9.6e-08 Torr

Wednesday, December 07, 2022, 13:29

Reinstalled in the evaporator.  Window was not shaded.  Will try heating to 500A once more.

ramp at 6A/min

Wednesday, September 14, 2022, 9:30

A Ta container tube was wrapped with 3 Ta heatshields.

322 graphite discs were loaded.

one Tantalum cup (modified to fit losely) was inserted on the front end along with a Ta spring.

A Ta spring was also installed on the back end to maintain the discs inside the tube.

The system was left to establish vacuum over night.

Good vacuum set to5e-03Torr

Bad vacuum was set to 5e-2 Torr

Total weight of system including springs = 249.63 g

Two Ta foils were installed on the copper heatshield facing the ends of the container.

The initial weight of the front Ta foil = 22.5 g

The initial weight of the back Ta foil will be determined by difference after cleaning =

OMEGA slope = 0.99

The target will be heated to 2100 C, held there for 10 hours.  The target will be removed, the end Ta foils will be removed to analyses, new Ta end foils will be installed and the Target will be heated to 2100 plus 10 A higher than previous and left at that temperature for 2 hours.

Wednesday, September 14, 2022, 9:47

IGP1= 4.57e--7 Torr

initial Utoramp at 1A/10s to 80A and held at 80 amps until pressure good.

 Wednesday, September 14, 2022, 11:54

Start autoramp at 1A/20s to 120A

 Wednesday, September 14, 2022, 12:22

Autoramp at 1A/20s to 200A

Wednesday, September 14, 2022, 12:34

Autoramp increased to 2A/20s when TGHT = 154A

Wednesday, September 14, 2022, 13:46

 Autoramping to 512A as projected current for 2100 C

 Wednesday, September 14, 2022, 14:24

OMEGA = 1945 C @ 512A

Tapped to 540A, 10.5V and OMEGA = 2075. Will leave at this current and see Temperature behaeviour.

After 10 min OMEGA reads 2080C.  Will start cooling at 12:20 am

Wednesday, September 14, 2022, 14:29

OMEGA = 2104C will ramp down slightly to keep 2100C

Wednesday, September 14, 2022, 14:31

OMEGA = 2098 @ 530A, 10.4V

Wednesday, September 14, 2022, 14:33

OMEGA = 2100 @ 410A,9.8V

Wednesday, September 14, 2022, 14:45

OMEGA = 2093 at 500A, 9.75V

Wednesday, September 14, 2022, 15:07

497A, 9.6V, OMEGA 2100

Wednesday, September 14, 2022, 22:09

@ approximately 515 pm noticed that OMEGA was reading 1600 C while TGHT was at 497A and 10.0V

Suspect damage to the container and possible damage

Left at the same current.

Just now the OMEGA is reading 2200C at 497A and 9.7V.  Out of precaution, lowered the current to 475A and the volatage is 9.2V

OMEGA now reads 2152 C.  Will leave at this current until 12:30 am when the 10 hour heating will end and will start rampdown at -2A/min

Thursday, September 15, 2022, 00:05

TGHT= 475A, 9.2V

OMEGA= 2126 C

IGP1= 1.33e-6 Torr

lowered current to 470A, 9.1 V, IGP1= 1.3e-6 Torr, OMEGA stabilized at 2120C

Thursday, September 15, 2022, 00:09

IGP1= 1.3e-6 Torr

will increase 10A to see pressure response. OMEGA= 2130C

Increase in IGP1 to 1.4e-6 Torr observed but immediately started to trend down

Thursday, September 15, 2022, 00:16

IGP1= 1.36e-6 Torr

OMEGA = 2131A

TGHT = 480 A

Thursday, September 15, 2022, 00:18

Start ramp down at -2A/min

Thursday, September 15, 2022, 09:45

IGP1=4.35e-07 Torr

TGHT turned off

Starting dismounting of target tube

Thursday, September 22, 2022, 07:04

Container tube was crystalized and was easily cut with a small pair of nail scissors.  All but 18 discs were transferred to a new container.  WO# 44691-3

Tuesday, July 10, 2018, 16:40

Container was flashed with TaC solution and let dry in air. 

No Ta heat shield is used. 

Desired temperature 1900C, ramp up TGHT accordingly. (Take note at 1500 and 1600 C).  

OMEGA slope setting = 0.98

TBHT set at 250A (as usual)

Chamber is currently being pump down.

 Wednesday, July 11, 2018, 10:54

Pressure at 4.5 e-7 Torr. 

Autoramping TGHT at 0.1A/min to reach 300A and TBHT at 0.1A/min to reach 230A. 

Once TGHT setting is reached, it will be further increased according to the temp measurement. 

 Friday, July 13, 2018, 10:57

TGHT at 300A/4.02V but temp is still too low to be detected. 

Increase TGHT to 400A, ramping at 1A/min.  TBHT is already at 230A/4.0V.

Current pressure at 4.4e-7 Torr.

 Friday, July 13, 2018, 13:09

TGHT reached 400A/5.85V, temp reading 1112C.

Ramping up to 500A

 TGHT reached 500A/7.9V.  temp reading 1250 C.

Ramping up to 600A

 Friday, July 13, 2018, 17:13

TGHT reached 600A/10.74V, temp reading 1742 C.

Ramping up to 650A

 Wednesday, July 18, 2018, 11:54

TGHT has remained at 650A/12.05V since Friday July 13.

Temperature check:

pyrometer: 1650 (250 correction) = 1900 C

OMEGA:  1-color (e= 0.32 for spectral hemispherical) = 1910 C

OMEGA: 2-color (slope @ 0.99) = 1905 C

Measurements are in agreement

Cooling TGHT at 2A/min, TBHT at 1A/min. Current pressure 3.7e-7 Torr.

 Wednesday, July 18, 2018, 13:47

TGHT at 500A, 8.4V, temp at 1600 C (4.2 kW)

TGHT at 475/7.84V, temp at 1550 C (3.72 kW - Max operating target heating power)

TGHT at 450/7.31V, temp at 1500 C (3.28 kW)

With TBHT set for 230A, usual operation setting, the temperature on the transfer tube is to exceed 2000 C.  Keeping TBHT at that setting may affect the overall temperature.

Note:  To condition the nanoSiC, it is better to keep TBHT at 0A and ramp up TGHT to 475A while monitoring the vacuum.  Then step up TBHT; any increase in vacuum would indicate a local evaporation of nanoSiC close to the ionizer. 

Temp measurement is complete, cooling down TGHT/TBHT to zero.

 Thursday, July 19, 2018, 12:23

TGHT has been at 0A for over 18 hours.  Vacuum pressure at 7e-8 Torr.

Venting chamber.

 Leak noted on previous TaC sintering on HP FEBIAD # 42464-3.

Swapped out gaskets on HS flex line a re-tightened.

Monday, November 25, 2019, 11:31: Roughing.

Monday, November 25, 2019, 11:42: Turbo pump on. 

Monday, November 25, 2019, 13:38: Vacuum @ 7.29e-06T. 

Monday, November 25, 2019, 13:42: Waterlines opened. Vacuum slowly climbed to 7.57e-06T. Waterlines closed / purged. 

Monday, November 25, 2019, 13:47: Vacuum @ 6.83e-06T.

Monday, November 25, 2019, 13:50: Waterlines opened. Vacuum gradually climbed again. Waterlines closed / purged.

Monday, November 25, 2019, 13:51: Turbo pump off. 

Monday, November 25, 2019, 14:41: Vent. Check seals (All on HS line).

Monday, November 25, 2019, 14:48: Roughing. 

Monday, November 25, 2019, 15:06: Vacuum @ 1.22e-04T. Waterlines opened. Vacuum continued to pump down steadily to 8.86e-05T and dropping.

Monday, November 25, 2019, 15:07: Turbo pump off. 

Monday, November 23, 2020, 17:01: Flex-line HS installed.

Tuesday, November 24, 2020, 08:03: Vacuum @ 9.55e-07T.

Tuesday, November 24, 2020, 08:08: Vacuum Ok

Tuesday, November 24, 2020, 08:09: Modify Controls dialogue on IEVAP2:IGP1:RDVAC

Max value from 0.1 to 0.0001 to better view curve on the strip tool and monitor for vacuum spikes.

Tuesday, November 24, 2020, 08:13: TGHT / TBHT PS on. 

Flex-Line HS had been fully scrubbed out earlier. All gaskets replaced.

Empty. Quick check for leaks.

Monday, March 01, 2021, 13:57: Roughing.

Monday, March 01, 2021, 14:13: TP1 on. 

Monday, March 01, 2021, 15:18: Vacuum @ 1.01e-05T. Open HS waterline. 

Monday, March 01, 2021, 15:24: Vacuum @ 9.30e-06T & dropping. Waterline ok. 

Monday, March 01, 2021, 15:25: Turbo pump off. Vent when ready. 

 FEBIAD installed. Anode PS installed. ANODE connected!.

Leak check

Thursday, September 10, 2020, 07:46: Vacuum @ 6.30e-07T

Thursday, September 10, 2020, 07:47: HS Waterline open. Stable vacuum.

Thursday, September 10, 2020, 07:51: Auto-ramp TGHT / TBHT to 400 / 200 A @ 2 A per min. 

FM

Thursday, September 10, 2020, 13:28: Pyrometer aligned.  Current reading 1106.7 @ slope=0.9

Thursday, September 10, 2020, 13:46: Auto-ramp TGHT / TBHT to 580/ 250A @ 2 A per min. 

Thursday, September 10, 2020, 13:47: Recording pyrometer data 

Thursday, September 10, 2020, 15:33: Auto-ramp finished. Temperature=1568.0 @slope=0.9

Thursday, September 10, 2020, 15:35: Voltage power supply limited to 150 mA.

Thursday, September 10, 2020, 15:36: Voltage power supply is set to output. Nothing strange on the other PS.

Thursday, September 10, 2020, 15:42: Slowly increased the voltage to 150 V but nothing read. two times during the voltage sweep the current on the Ps showed 1mA. Nothing strangeon the vacumm or the other power supply voltages

Thursday, September 10, 2020, 15:45: Auto-rampup TBHT to 290 @ 2A/min 

Thursday, September 10, 2020, 16:08: Voltage sweep  

Thursday, September 10, 2020, 17:24: Auto-rampup to 300 @ 2A/min

Friday, September 11, 2020, 11:05: Auto-ramping to 290 @ -2A/min 

Friday, September 11, 2020, 13:22: auto-ramping to 305 @ 2A/min 

Friday, September 11, 2020, 14:10: The power supply is not reading current anymore. At 305 A I couldn't get any reading. I lowered the current to 290 A and the PS displays 0 mA even at 500 V, whereas before it showed 13 mA.

Vacuum looks normal not any sort of spike.

I will open the system to inspect the interior.

Friday, September 11, 2020, 14:15: Auto-cooling to 0 A TGHT/TBHT @-2A/min 

Saturday, September 12, 2020, 10:52: Venting 

Saturday, September 12, 2020, 14:00: Confirmed anode de-attached. I will spot welded again. 

Saturday, September 12, 2020, 18:29: After many failures I aborted the spot welding. The anode ended up looking pretty bad. 

 Sunday, September 13, 2020, 19:06: Opened waterlines. Vacuum still decreasing.

Monday, September 14, 2020, 09:12: Vacuum @  8.15e-7 T. and decreasing. I will start the ramping now.

Monday, September 14, 2020, 09:28: Auto-ramping to 400/200 A @ 4/min (1 A/15 s) .

No reading on the 2-color pyrometer channel. 1-color channels indicate around 1000C

 Monday, September 14, 2020, 12:49: Recording temperature and vacuum. Auto-ramp TBHT to 210 @ 4A/min.

 Monday, September 14, 2020, 12:57: Emissivity slope sweep. Only "under" is being shown

Monday, September 14, 2020, 12:58:  Auto-ramp TBHT to 220 @ 4A/min. 

Monday, September 14, 2020, 13:05: Emissivity slope sweep. Only "under" is being shown

Monday, September 14, 2020, 13:06: Auto-ramp TBHT to 240 @ 4A/min.  

Monday, September 14, 2020, 13:17: Auto-ramp TBHT to 250 @ 4A/min.   

Monday, September 14, 2020, 13:22: Emissivity slope sweep. Only "under" is being shown 

Monday, September 14, 2020, 13:23: Auto-ramp TBHT to 260 @ 4A/min.    

Monday, September 14, 2020, 13:27 : Emissivity slope sweep. Only "under" is being shown 

Monday, September 14, 2020, 13:27 : Auto-ramp TBHT to 275 @ 4A/min.    

Monday, September 14, 2020, 13:36: Emissivity slope sweep. Only "under" is being shown for the 2-color channel. 1-color channel displays around 1200 C. Maybe there is a different  cutoff for the 2-color channel

Monday, September 14, 2020, 13:38: At 400V the PS reads back 1mA 

Monday, September 14, 2020, 13:39 : Auto-ramp TBHT to 290 @ 4A/min.   

Monday, September 14, 2020, 17:41: Roughing 

Tuesday, September 15, 2020, 07:03: Vacuum stable at 4.65e-7T.

Tuesday, September 15, 2020, 07:03:  Auto-ramp TGHT / TBHT to 400/ 200A @ 4 A per min. 

Tuesday, September 15, 2020, 10:00:  Auto-ramp TGHT  to 500 @ 4 A per min. 

Tuesday, September 15, 2020, 11:13:  Auto-ramp  TBHT to 250@ 4 A per min. 

Tuesday, September 15, 2020, 15:44: There is a short inside the system. I  thought it might be the vanadium wire but increasing the tbht current did not indicate a clear evaporation so I don't think this is the case.

I'll ramp down to 0 at 8A/min to open and inspect. My measurements don't make any sense without both the pyrometer and the anode leakage current reading.

Tuesday, September 15, 2020, 15:49: Auto-cooling TGHT/TBHT to 0A at 8A/min (2A /15 s).

 Tuesday, September 15, 2020, 16:00: Auto-cooling aborted, the system is no longer current limited. The contact causing the issue probably moved while cooling.

***many ramp ups.downs, Temperature measurements, voltage sweeps, inverse temperature estimations. Absolute temperature measurements for when the vanadium wire melted, the pyrometer was already reading 1920, a slightly adjust on the emissivity slope move it to 1911C

Tuesday, September 15, 2020, 18:47: Ramp down TGHT/TBHT to 500/250 A @ -1A/min

Tuesday, September 15, 2020, 18:48: Done for today. 

Wednesday, September 16, 2020, 10:02: Auto-ramp up TGHT/TBHT to 580/285 A @ 2A/min 

Wednesday, September 16, 2020, 12:59: Auto-ramp  up TGHT/TBHT to 600 A @ 2 A/min 

Wednesday, September 16, 2020, 13:45: Auto-ramp up TBHT to 290 A @ 1A/min 

Wednesday, September 16, 2020, 18:45: Auto-ramp down TGHT/TBHT to 400/200 A @ -2A/min 

Thursday, September 17, 2020, 08:46: Auto-ramp up TBHT to 285 A @ 2A/min 

Thursday, September 17, 2020, 12:03: Auto-cooling TGHT/TBHT to 0A @ -4A/min

Thursday, September 17, 2020, 13:49: Turbo off. Roughing pump off 

 Monday, February 13, 2012, 16:21

The Evaporator 2 is now commissioned.  See attachment#1 for the commissioning report or refer to Document #43321.