Flora Wu wrote:

Thursday, June 09, 2022, 11:25 Total number of foils: 14 electrospun fiber pellets  Total weight = 208.3 g container has 3 Ta heat shields. Desired temperature at 1800 C Omega slope set at 0.990  Good vac = 3.0e-5 Torr, Bad vac = 5.0e-5 Torr. Pumping down in progress  Thursday, June 09, 2022, 11:25 chamber pumped down below 5e-5 initiate auto ramping, 1A/min ----> 100 A

 Thursday, June 09, 2022, 19:16

Pressure came down below 10e-5 Torr as TGHT ramped up to 100A.

Continue auto ramping to reach 250A at 1A/min.

 Thursday, June 09, 2022, 22:52

TGHT is hovering around 127A/1.68 V due to erractic pressure, see attachment #1..  Notice the backing line is at atm pressure - I don't recall this happened in the past. 

Temp is still low to be detected on Omega.  Will leave this overnight.

 Friday, June 10, 2022, 09:07

TGHT has been holding at 250A/3.76V since 2:45am.  Pressure comes down as THGT above 200 A.  Backing line is back down normal.

Temp reading at 1040 C. 

see attachment #2.

Continue to ramp up to 300A, monitoring temp/pressure.

 Friday, June 10, 2022, 10:31

TGHT reached to 300A/4.63V, temp at 1145C.  Pressure at 1.8e-6 and coming down. 

Continue to ramp up to 350A.

 Friday, June 10, 2022, 11:59

TGHT at 350A/5.66V, temp at 1300 C, Pressure at 8.1e-7 Torr, and coming down.

Continue to ramp up to 400A.

Friday, June 10, 2022, 13:19

TGHT reached to 400A/6.73V.  Pressure coming down from 1.04e-6 Torr. 

Temp at 1690.  Will set up manually to reach 1800 C. 

 Friday, June 10, 2022, 13:50

TGHT stepped up to 432A/7.42V.  Pressure coming down from 1.3 e-6 Torr. 

Temp at 1800 C.  See attachment#3 and #4 for the screenshot and temp-current plot.

Dumped striptool data to /usr1/evpr/carbonize_pan10_elog581_a and b.

Will keep at this setting over the weekend, and cooling down will take place on Sunday evening. 

 Sunday, June 12, 2022, 22:30

TGHT has been holding at 432A/7.40V since Friday.  Temperature has gone up slightly to 1825. 

See attachment#5 for the overall process. 

Initiated cooling down at -2A/min.

Chamber will be vented on Monday morning.

Friday, July 24, 2020, 15:00

Ta tube cotaining 497 ZrC discs wrapped with Ta heat-shields (3 layers)

Desired temperature= 1800C (expected TGHT 410 A), TBHT will be set fixed at 230A (max).

good vacuum = 3.00 e-05 Torr

bad vacuum = 5.00 e-05 Torr

Evap 2 was left to pump down over night.

Saturday, July 25, 2020, 08:57

IGP1= 8.7 e-07 Torr

Start ramp at 0.25 A/min to 20 A on TGHT 

Saturday, July 25, 2020, 10:07

IGP1= 2.7e -06 Torr

Set ramp target to 30 A 

Wednesday, July 29, 2020, 13:11 

OMEGA reading 1700 C at 430 A during the night.  It was kept at this temperature for 3.5 hours.  The OMEGA slope was not changed from 0.990

when IGP1 = 1.2 e-06 Torr and stable, cooling was started at -3A/min at 9 am on this day.

IGP1= 2.2 e-07 Torr now at time of dismounting

Saturday, November 23, 2024, 11:08

 No milling ZrC material sintering inside graphite cartridge

baseline standard discs included for comparison. 

4 Ta foils wrapped around  container

one spring at the back end to retain the graphite cartridge

One Ta cap with perforations at the front for T readings

initial heating at 2A/min to 50A, followed by heating at 1A/min to 90 A

Initial IGP1= 1.0e-6 Torr

OMEGA slope =0.990

Good and bad vacuum =5.0e-5 Torr and 5e-4 torr

Saturday, November 23, 2024, 11:20

autoramp start at 2A/min to 50A on tght

Saturday, November 23, 2024, 20:11

allowed pressure to drop to 3.3e-6 Torr after degassing. 

Started ramp to 90A at 1A/min

Saturday, November 23, 2024, 23:46

started ramping at 1.5A/120s or 0.75A/min to 400A

Sunday, November 24, 2024, 07:55

Reached 1900 C at 410 A setpoint and 402 A on RD

Pressure did not increase after bumping up to 410 setpoint so will keep at this current until 11 am (four hours near 1900 C in total)

Sunday, November 24, 2024, 10:58

Final IGP1 at start of rampdown = 2.9e-6 Torr

Ramping down at -2A/min

The maximum current of 580A was reached at 9:15.

TGHT:RDCUR 578 A

TGHT:RDVOL 9.87 V

IGP1:RDVAC 3.8e-6

The temperature was measured with the Minolta 2-color pyrometer:

from the side - inside target container : ~1200 deg C

from the front trough hole in the heat shield : ~1800 deg C

Target was conditioned for 4 hours at 580A.

Initiating ramp-down sequence @ 2A/min

Peter Kunz wrote:

Target was conditioned for 4 hours at 580A. Initiating ramp-down sequence @ 2A/min

 Tuesday, August 05, 2014, 12:00

target vented in air and taken out this morning

 Tuesday, August 08, 2017, 14:57

See elog i.d's #384 and #381

Investigated wiring in PLC.

Some wires in PLC were not creating a good contact - could be problem re: IGP1 tripping off.

Wires replaced by Gelo.

Pumped down and turned on power supplies over weekend.

Everything remained on - IGP1 did not trip system off.

May proceed with regular use.

 Tuesday, September 12, 2017, 12:00:

The coated back window was changed to a shuttered window.

On star-point flange bolt interfered with the shutter, however it was removed, shortened, and re-installed.

The installation is complete. Awaiting roughing pump to leak check.

This morning, the vacuum responded to shutting of the water of the heat shield circuit (leak rate without pumping leveling out). The vacuum chamber was vented and the heat shield with flexible lines was replaced with another heat shield with fixed lines. The chamber was again pumped down and water opened at ~150 mTorr to test the leak up rate without pumping. No leaks apparent, so continued pumping down with turbo pump. At a vacuum of about 1E-6 Torr the water was again supplied to the heat shield circuit and an increase in vacuum could be observed. Stopped the turbo pump and prepared to vent. Two new heat shield lines were brazed in the machine shop and fitted by Maico after lunch. During this time one of the old lines (from heat shield to feedthrough in box) was leak tested and a leak found at a location just above the VCR. The line had been twisted and due to the twist developed a leak. With the two lines replaced, the vacuum was pumped down again and water could be supplied without any increase in vacuum pressure at 1E-6 Torr. To facilitate the new copper tubing, the restraining bracket for the heat shield VCRs was not mounted. It will have to be fitted later. Until then, please contact Anders for help in removing the heat shield to prevent any damage to the new lines.

Monday, July 10, 2017, 17:28

Two np-SiC fibrous pellets with different applied pressure:

1) 200MPa, 2)  335 MPa (see logbook pg 36 for more details). 

Desired heating temperature: 1550C (Previous setting: TGHT 400A/6.94V)

Two layers of Ta foils wrapped around the target boat.

Chamber is pumping down...

 Tuesday, July 11, 2017, 11:11

Pressured came down to 1.0e-6 Torr. 

Tapping up TGHT.

 Tuesday, July 11, 2017, 11:24

Tapped TGHT up to 45A - pressure stabilized at around 3.0e-5 Torr. 

Auto ramp 1.0A/min to reach 350A before tapping up further.

 Wednesday, July 12, 2017, 10:59

TGHT reached to 350A/5.5V, temp @ 1270C - much lower than expected; could be a short between the target container and the heat shield.  I actually had a had time adjusting the target legs to avoid shorting the cu-heat shield. 

Tapped TGHT further up to 375A/6.07V, Omega Temp at 1340C.  Holding current for about 50 mins, re-measured with pyrometer - temperature matches.

Wednesday, July 12, 2017, 14:49 

TGHT set at 450A/7.7A.  Temp at ~1550C.  See attachment for temp plot

Holding at temp for 5 days before cooling down on Monday July 17.

 Thursday, July 13, 2017, 17:52

TGHT tripped off due to bad IEVAP2:WFB1 water flow.  Not sure what was the cause.  Will leave the heater off for now and investigate this tomorrow.

 Friday, July 14, 2017, 11:48

Investigated the bad water flow situation.  It was due to a faulty water flow sensor.  The paddle wheel stopped turning until I gave it a tab.  We had a similar problem before with the water sensor, see elog ID 109.  It is probably the time to replace all the water sensors. 

 Tuesday, May 03, 2016, 14:29

Turned vacuum pump on this morning, sounded awful: loud grinding bad noises.

Called vacuum group, will replace pump tomorrow morning.

Sounds like materials coming out from all the out-gassing during sintering processes has ruined the bearings.

Evaporator #2 is still under construction.  For further information please contact Jens Lassen.

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.

 Monday, May 08, 2017, 10:05

Turbo pump control box died last week.

Replaced with a new one.

Swapped out VCRs on HS to tray connection. (Right one felt slightly off)

Tuesday, September 17, 2019, 13:23: roughing.

Tuesday, September 17, 2019, 13:32: Turbo pump on. 

Tuesday, September 17, 2019, 13:44: waterlines re-opened. No vacuum response. Ok. @ 7.90e-05T & dropping. 

Wednesday, September 18, 2019, 08:05: Vacuum ok @ 6.87e-07T. Turbo pump off. 

Wednesday, September 18, 2019, 08:21: Venting. 

Pumped down again easy for Ta#59. Issue resolved.

Thursday, June 09, 2022, 09:07

Yesterday, Wednesday June 08, 2022 @ ~3.00 pm a "dummy" target container was installed in EVAP 2 after the heatshield assembly had been swapped.

The purpose is to test correct functioning of the system.  Melting and evaporation on one of the bolts of the previous target container (eLog578) prompted the change in heatshield assembly and current testing.

TGHT was ramped up to 740A @ 4A/min, left to run at the final current for ~4.5 hours and then ramped down @-2A/min to 0A.

Will dismount dummy container this morning.

IGP1=2.5e-07 Torr

Thursday, June 09, 2022, 11:16

The target appears in good shape.  No abnormal behaviour. 

Picture attached are of the previous failed target eLog 578

Swapped out the Cu gaskets for SS gaskets in the HS top lines. (x2)

Wednesday, October 13, 2021, 08:35: Roughing.

Wednesday, October 13, 2021, 08:50: Turbo pump on. TP Current 6.06-6.10A.

Wednesday, October 13, 2021, 08:59: TP maxed out at 3-4 KRPM, yet went "Green/On".

Wednesday, October 13, 2021, 09:00: Change FULL to Low setting. Restart. TP Current 6.15A.

Wednesday, October 13, 2021, 09:08: Timed out. Restarted from 5 KRPM. 

Wednesday, October 13, 2021, 09:14: Stalling @ 5 KRPM. Stop TP. Contact vacuum group.

Monday, October 18, 2021, 09:03: Roughing. Reboot TP controller. 

Monday, October 18, 2021, 09:25: Walkthrough soft start w/ vacuum group. TP timed out. Soft start failed. 

Monday, October 18, 2021, 09:31: EVAP 2 vented. TP to be disconnected & removed.

Monday, October 18, 2021, 09:55: TP removed. Quick check, barely spins when spin by hand gently. Replacement or refurbishment needed. 

500 lpm turbo pumps installed. TV551 Varian. SN: 202311 (Slightly active from BL1A - will not cross contaminate. Field only - Tagged) 

Wednesday, October 20, 2021, 11:35: Roughing. 

Wednesday, October 20, 2021, 11:52: TP on. 

Wednesday, October 20, 2021, 11:59: TP at speed. 

Wednesday, October 20, 2021, 12:02: Vacuum @ 6.13e-05T. Open HS waterline.

Wednesday, October 20, 2021, 12:03: Vacuum @ 5.63e-05T & dropping.

Wednesday, October 20, 2021, 12:04: Vacuum @ 5.32e-05T. TGHT PS on. 

Thursday, March 07, 2019, 09:09

Transfer tube from Legnaro was coated with TaC.

The transfer tube was set in a tantalum boat and wrapped with 3 heat shields,

the legs of the transfer tube were let out of the shielding sheets.

Chamber pump down was started on Wednesday March 06, 2019.

Desired temperature TGHT = 1800 C, Omega slope set = 0.990.

IGP1= 4.48e-07 Torr

Will tap up TGHT manually to 40-50 A and monitor pressure.

 Thursday, March 07, 2019, 10:57

The TGHT current was left at 40 A for 50 min, the pressure achieved was 6.15e-7 Torr

The TGHT was rised to 45 A 11:00 am the pressure rised to 6.18e-7 Torr (11:10am)

The TGHT was rised to 50 A 11:10 am the pressure rised to 6.81e-7 Torr (11:32am)

auto ramp was set to 1 A/min to 300 A

Good vacuum 3e-5 Torr

Bad vaccum 5e-5 Torr

auto ramp was set to 1 A/min to 400 A

auto ramp was set to 1 A/min to 470 A

Final conditions TGHT = 485 A, 8.25V Temperature = 1800 C

The transfer tube stayed at 1800 C for 4 hours

auto ramp was set to -1 A/min to 0 A. 

Friday, March 08, 2019, 16:53 

EVAP2 was vented with air and the transfer tube was unloaded

Wednesday, April 26, 2023, 09:32

LP FEBIAD loaded with 367 TiC discs and 4 TiC removable discs for analyses

50 packs of 5 and the rest are singles

TaC coated (sintered) springs placed at both ends

Initial total Weight = 521.83 g

Initial heating @ 1A/min to 400 A on TGHT and 280A on TBHT

OMEGA slope = 0.99

Vacuum limits up to 200A:  3.0e-05 Torr -- 5.0e-04 Torr

Vacuum limit up after 200A: 3.0e-05 Torr -- 5.0e-05 Torr

No Ta heat-shields used

Initial IGP1 = 4.1e-07 Torr

Wednesday, April 26, 2023, 09:49

Starting initial ramp up to 200A on both TGHT and TBHT @ 1A/min

Wednesday, April 26, 2023, 12:50

Around 120A on TGHT, the pressure started to slowly drop.  First outgassing done.

Wednesday, April 26, 2023, 14:03

IGP1 = 6.0 e-05 Torr

TGHT = 200 A, 2.7V

TBHT = 200 A, 2.6 v

OMEGA = Below lower limit

Waiting for pressure to fall below 5e0-5 Torr.  Will change bad vacuum to 5.0e-05 Torr and then continue ramping @1A/min to 400 A on TGHT and 280 A on TBHT.

Wednesday, April 26, 2023, 14:13

IGPI= 4.2 e-05 Torr

starting ramping to 400 A on TGHT and 280A on TBHT 

Wednesday, April 26, 2023, 14:26

The IGP1 pressure just fell below 3.0e-05 Torr and ramping has resumed

Wednesday, April 26, 2023, 14:42

pressure hovering around good vacuum so very slow progress.

Wednesday, April 26, 2023, 15:12

TGHT= 223 A, 3.1 V

TBHT = 226 A, 3.0 V

Set ramp rate is 1A/min but real rate is slightly less than 0.5A/min due to pressure fluctuation.

Darwin Ortiz Rosales wrote:

Wednesday, April 26, 2023, 09:32 LP FEBIAD loaded with 367 TiC discs and 4 TiC removable discs for analyses 50 packs of 5 and the rest are singles TaC coated (sintered) springs placed at both ends Initial total Weight = 521.83 g Initial heating @ 1A/min to 400 A on TGHT and 280A on TBHT OMEGA slope = 0.99 Vacuum limits up to 200A:  3.0e-05 Torr -- 5.0e-04 Torr Vacuum limit up after 200A: 3.0e-05 Torr -- 5.5e-05 Torr No Ta heat-shields used Initial IGP1 = 4.1e-07 Torr Wednesday, April 26, 2023, 09:49 Starting initial ramp up to 200A on both TGHT and TBHT @ 1A/min Wednesday, April 26, 2023, 12:50 Around 120A on TGHT, the pressure started to slowly drop.  First outgassing done. Wednesday, April 26, 2023, 14:03 IGP1 = 6.0 e-05 Torr TGHT = 200 A, 2.7V TBHT = 200 A, 2.6 v OMEGA = Below lower limit Waiting for pressure to fall below 5e0-5 Torr.  Will change bad vacuum to 5.0e-05 Torr and then continue ramping @1A/min to 400 A on TGHT and 280 A on TBHT. Wednesday, April 26, 2023, 14:13 IGPI= 4.2 e-05 Torr starting ramping to 400 A on TGHT and 280A on TBHT  Wednesday, April 26, 2023, 14:26 The IGP1 pressure just fell below 3.0e-05 Torr and ramping has resumed Wednesday, April 26, 2023, 14:42 pressure hovering around good vacuum so very slow progress. Wednesday, April 26, 2023, 15:12 TGHT= 223 A, 3.1 V TBHT = 226 A, 3.0 V Set ramp rate is 1A/min but real rate is slightly less than 0.5A/min due to pressure fluctuation.

 Vacuum spike at 300A.

Currently:

TGHT= 316A, 4.6V

TBHT=283A, 3.9V

Wednesday, April 26, 2023, 18:18 Ramping TBHT down from 280A to 270A