Tuesday, November 01, 2022, 17:24

2 samples of np-TiO2/C fibres were produced using the e-spinner.  Each sample was wrapped with a piece of graphite sheet, and then loaded into a target container. 

Sample will be heated to 1700 C.

TGHT will be autoramped to 450 A; this should be close to 1600 C. (see elog#596)

Good vacuum: 3e-5 Torr

Bad vacuum: 5e-5 Torr

Omega slope: 0.99

Initiate autoramp: 1 A/min

Chamber has been pumped down below 4.2e-6 Torr.

 Tuesday, November 01, 2022, 22:46

 Pressure currently at 6.4e-7 Torr.

Initiated auto-ramping

 Wednesday, November 02, 2022, 09:37

TGHT was ramped up to 448A (readback 445-452A / 8.05V - 8.11V).  The voltage is much higher than the last process, see elog #596.

Temperature is much higher at this current, reading at 1870 - 1872 C. 

Will keep at this setting for now and continue to monitor.

See attachment#1 for the TGHT-Pressure plot.

 Wednesday, November 02, 2022, 21:35

Samples have been heated for over 16 hours; temp has been stabilized at 1875 C, vacuum at 7.3 e-7 Torr. 

Initiated cooling at 1A/min.

Chamber will be vented tomorrow morning.

Friday, October 28, 2022, 07:58

The coated container was wrapped in four Ta foil heatshields.

Target temperature on OMEGA= 1850-1900 C

OMEGA slope:= 0.990

Target time at max temperature = 4 hours

Final Current TBHT= 230A

Final TGHT current= ~420A (adjustable)

Heating autoramp starged at 4A/min on both TGHT and TBHT to 40A

Then at 1A/min on both heaters to 120A.

Good vacuum = 5.0 e-02 Torr

Bad vacuum = 5.0E-04 Torr

 IGP1 initial = 4.5e-07 Torr

Friday, October 28, 2022, 10:50

after reaching 120A and leaving until pressure drop, autoramp at 2.5A/30s (5A/min) towards 400A TGHT and 230A TBHT.

Friday, October 28, 2022, 11:22

OMEGA= 1890 @ 412A, 7.1 V on TGHT

Leaving for 4 hours

Tuesday, October 25, 2022, 12:18

Container wrapped in 4 Ta foil heatshields

Target temperature on OMEGA= 1850-1900 C

OMEGA slope:= 0.990

Target time at max temperature = 4 hours

Final Current TBHT= 230A

Final TGHT current= ~420A (adjustable)

Heating autoramp started at 2A/min on both TGHT and TBHT to40A

Then at 1A/min on both heaters to 120A.

Good vacuum = 5.0 e-04 Torr

Bad vacuum = 5.0E-02 Torr

Wednesday, October 26, 2022, 07:07

IGP1= 7.5e-7 Torr

start ramp at 2A/min to 40A

Ramped at 1A/min to 120A then held until pressure drop.  Then ramped @ 4A/min to 400A on TGHT.

Wednesday, October 26, 2022, 14:09 

Manually rampted TGHT to 415A, 6.9V will hold for 4 hours 

OMEGA reads 1870 C initially

Thursday, October 27, 2022, 09:44

was held for 5 hours due to technical issues but should be ok.

OMEGA @ time of rampdown = 1830C

Rampdown @-2A/min TGHT and -1A/min TBHT

IGP1= 3.5e-07 Torr

Hannah Toy wrote:

Tuesday, October 18, 2022, 13:52 38 pieces of samples made of TiO2/C/PVP loaded into a target boat wrapped with 2 layers of Ta-heat shield. Samples will be heated to 1700, 1800, 1900, and 2000 C Some of the pieces will be removed after each target temperature  Target chamber has been pumping down and the current pressure reading is 6.62e-6 T  Tuesday, October 18, 2022, 14:12 TGHT will be autoramped to 250 A Good vacuum: 3e-5 Torr Bad vacuum: 5e-5 Torr Omega slope: 0.99 Initiate autoramp: 1 A/min

 Wednesday, October 19, 2022, 09:42

TGHT has reached to 250A/3.95V, Temp at ~1100 C.  (The archiver is currently not working; already contacted Control to look into it.)

Pressure reached below 4.9 e-7 Torr. 

Auto-ramp to 300 A at 2A/min.  Continue to monitor.

 Wednesday, October 19, 2022, 10:24

TGHT reached to 300 A/4.89V.  Temp at 1206 C. 

Pressure went up slightly and came down after the TGHT setpoint was reached, see attachment#1.

Continue to auto-ramp to 350A at 2A/min.

 Wednesday, October 19, 2022, 11:35

TGHT reached to 350A/5.8V.  Temp at 1360C.

Pressure reached above 1e-6 Torr and came down after TGHT reached the setpoint. 

Continue to auto-ramp to 400 A at 2A/min

 Wednesday, October 19, 2022, 11:57

TGHT reached to 400 A/6.89V.  Temp at 1485C.

Pressure went up to 3.3e-6 Torr and came down after TGHT reached the setpoint,  see attachment#2.

A temp vs current plot has been generated (see shared folder \Hannah\) - est TGHT 480A to reach 1700 (T1).

Auto-ramp to 420 at 1A/min.  Continue to monitor closely...

 Wednesday, October 19, 2022, 13:01

TGHT reached 420A/7.23V, Temp at 1520 C.

Continue auto-ramping to 440A at 1A/min.

 Wednesday, October 19, 2022, 13:42

TGHT reached 440A/7.65V.  Temp at 1572 C

Continue auto-ramping to 460A at 1A/min.

Wednesday, October 19, 2022, 14:10

TGHT reached to 460A/8.10 V.  Temp at 1628 C.

Tapping up TGHT to reach 1700 C

 Wednesday, October 19, 2022, 15:33

TGHT was tapped up to 474A, Temp reached to 1700 C since 14:30.

Pressure is slowing coming down, currently at 1.4 e-6 Torr.

Will hold at this target current for a few hours.

 Wednesday, October 19, 2022, 16:58

Temp went up slightly to 1713 C as the pressure is coming down. 

Lower TGHT to 468A/8.45V to maintain the temp at 1700 C.

 Wednesday, October 19, 2022, 19:55

Temp went up again to 1716 C, but this time the pressure also went up, see attachment#3.  Not sure why the target got hotter... the voltage seems normal and consistent. 

Lower TGHT to 462A/8.44V to maintain at 1700 C. 

Continue monitoring...

 Wednesday, October 19, 2022, 22:56

Temp went up another 10 C, to 1710 C, TGHT is holding at 462 A/8.48V.  Notice the TGHT current readback is fluctuating between 458A - 463 A. 

Initiated cooling.. 2A/min

 Friday, October 21, 2022, 08:55

 All the samples were taken out from the Evap on Thursday Oct 20.  We decided to do so because there was not enough sample in each batch for XRD analysis.  All the sample will be analyzed as treated at 1700 C. 

See attachement #$ for the overall TGHT/Vac plot.

 Tuesday, October 18, 2022, 13:52

38 pieces of samples made of TiO2/C/PVP loaded into a target boat wrapped with 2 layers of Ta-heat shield.

Samples will be heated to 1700, 1800, 1900, and 2000 C

Some of the pieces will be removed after each target temperature 

Target chamber has been pumping down and the current pressure reading is 6.62e-6 T

 Tuesday, October 18, 2022, 14:12

TGHT will be autoramped to 250 A

Good vacuum: 3e-5 Torr

Bad vacuum: 5e-5 Torr

Omega slope: 0.99

Initiate autoramp: 1 A/min

Monday, October 17, 2022, 10:03

The coated container was wrapped in 4 Ta foil heatshields. (The 4 shields appear to work well)

Target temperature on OMEGA= 1850-1900 C

OMEGA slope:= 0.990

Target time at max temperature = 4 hours

Final Current TBHT= 230A

Final TGHT current= ~420A (adjustable)

Heating autoramp started at 2A/min on both TGHT and TBHT to40A

Then at 1A/min on both heaters to 120A.

Good vacuum = 5.0 e-04 Torr

Bad vacuum = 5.0E-02 Torr

Monday, October 17, 2022, 12:45

Autoramping @4A/min on both TGHT and TBHT to 400 and 30A respectively

Monday, October 17, 2022, 12:56

slowed ramp to 2A/min on both heaters as pressure was increasing too fast.  (1A/30s).

Monday, October 17, 2022, 13:30

increased ramp rate to 4A/min on TGHT as TBHT is already at 230A

Monday, October 17, 2022, 14:16

leaving at TGHT : 393A, 6.5V ; TBHT  233A, 4.2V

OMEGA reads 1864C.  Will start rampdown at 6:17 pm

Monday, October 17, 2022, 18:16

OMEGA read 1875C at max and now reads 1856C

starting ramp down at -2A/min TGHT and -1A/min TBHT

Final IGP1= 1.4e-06 Torr

Tuesday, October 18, 2022, 09:37

IGP1= 2.72e-7 Torr

Turning heaters off on epics and turning vacuums off. 

Thursday, September 29, 2022, 09:57

A Ta container tube was wrapped with 3 Ta heatshields.

338 graphite discs were loaded.

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

on the backside there is no spring but four discs glued together with PVA

The system was left to establish vacuum over night.

Good vacuum set to5e-04Torr

Bad vacuum was set to 5e-2 Torr

Total weight of system including springs = 249.07 g

OMEGA slope = 0.99

The target will be heated to 2100 C, held there for 10 hours.  The target Temperature vs Power will be tabulated and the current required to reach 2100 will  be extrapolated to avoid using OMEGA at higher temperatures.

a)  The target will be removed, weighed and inspected

b) If the target boat is still good, run again at 10A higher than previous for 2 hours.

c) The target will be removed, weighed and inspected

d) i) If the weight is the same or negligible, experiment ends

  ii) if the weight has decreased and target still intact, repeat from step b and document all measurements and settings

 Thursday, September 29, 2022, 10:04

IGP1= 1.4e-04 Torr

TGHT= 80.0 A, 1.0V

Will allow pressure to drop and then continue heating

Thursday, September 29, 2022, 10:20

IGP1= 7.9e-05 Torr pressure on downward trend

Start heating at 2A/min to 200A

The target started dropping in temperature as current increased.  Suspected OMEGA issue.

Started cooling at -2A/min

Will continue next week.

Monday, October 03, 2022, 11:05

Upon inspection, the window though which the OMEGA laser travels was coated with dark precipitate (mostly a spot in the direct path of the laser).

Cleaned the window and started pumpdown.

Monday, October 03, 2022, 12:57

start heating @2A/20s = 6A/min because the target had previously been heated past additive evaporation point.

IGP1= 3.8e-06 Torr

Monday, October 03, 2022, 18:41

Will heat to 500A and leave for 10 hours.  The regression shows too high current to reach 2100.  Not reasonable.  So will work with 500A as a baseline.

Tuesday, October 04, 2022, 06:52

Temperature @500 A read 1742C

maintained for 10 hours

start rampdown at -2A/min 

OMEGA currently 1099C

Current = 500 A

Voltage =9.9 V

IGP1= 5.9e-7 Torr

Tuesday, October 04, 2022, 21:32

Quartz window was completely covered with graphite like dust.  final weight after heating = 244.57 g (a couple of discs came loose and they were weighed separately and not included in the next heating).

weighted target and added one extra heatshield because it looked like a lot of heat was escaping.  Will treat at 500A again for 2 hours.  The extra heat-shield should provide hotter environment.

new initial weight = 254.24 g (don't have a balance with greater precision .

Wednesday, October 05, 2022, 07:42

IGP1= 3.8e-07 Torr

ramping to 280A @ 3A/min

Wednesday, October 05, 2022, 11:40

ramping to 350 @ 3A/min

Then ramp to 500A

500A at 12:50

Wednesday, October 05, 2022, 15:52

ramping down at -2A/min

Thursday, October 06, 2022, 09:27

IGP1= 1.8e-07 Torr

Will dismount and weigh, then decide how to proceed

according to second regression, second heating was ~2000 C.  OMEGA not reliable after 1700 C in this case. 

Thursday, October 06, 2022, 12:34

The final weight after the second heating was = 254.19 g

reinstalled target and cleaned quartz window. 

will heat up to 510 A

Friday, October 07, 2022, 07:46

IGP1=  3.0 e-07 Torr

ramp at 2A/min to 500A.  will pause to take data points for regression.

Friday, October 07, 2022, 13:05

Start rampdown after two hours at 500A, 10.3V

-2A/min

Thursday, September 22, 2022, 07:13

Each endcap is separated with a disc of graphite foil and rolled into 3 packs of 4 within a foil envelope in a target boat.

There are also 2 coated springs

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

Chamber pumped down over previous night

Good vacuum = 5.0e-04 Torr

bad vacuum = 5.e-02 Torr

OMEGA slope = 0.99

Will ramp TGHT up to 40 A then autoramp to 400A at 1A/min.

Final desired temperature on OMEGA (tap)= 1800C

IGP1= 3.8e-7 Torr

Thursday, September 22, 2022, 10:08

TGHT= 168A,

IGP1= 4.7E-07=6Torr

Increased  ramp to 2A/min

Thursday, September 22, 2022, 12:08

TGHT= 400A, 6.7V

OMEGA= 1604C

Continuing autoramp to 450A @2A/min

Thursday, September 22, 2022, 12:36

TGHT=450A, 7.7V

OMEGA=1700C

Tapping to 1800C manually

Thursday, September 22, 2022, 12:54

OMEGA = 1750C at 505A, 8.8 V 

Tapped to 540A, 9.5V

Will leave there for two more hours

OMEGA= 1800+/- 10 C

Thursday, September 22, 2022, 15:00

TGHT = 540A, 9.3V

OMEGA= 1713

start rampdown at-2A/min
 

Friday, September 23, 2022, 09:49

IGP1= 4.0e-7 Torr

Will dismount container

Saturday, September 24, 2022, 09:10

Endcaps looked good.  The front spring sintered onto container and not usable.  signs of overheating.

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

Thursday, September 01, 2022, 10:34

The coated container was wrapped in three Ta foil heatshields.

Target temperature on OMEGA= 1850-1900 C

OMEGA slope:= 0.990

Target time at max temperature = 4 hours

Final Current TBHT= 230A

Final TGHT current= ~420A (adjustable)

Heating autoramp starged at 2A/min on both TGHT and TBHT to 40A

Then at 1A/min on both heaters to 120A.

Good vacuum = 5.0 e-05 Torr

Bad vacuum = 5.0E-04 Torr

Thursday, September 01, 2022, 12:39

Has been stabilizing at 40A on both heaters.

Starting 1A/min autoramp to 80A

A discrepancy between setpoint and readback currents was observed for both TGHT and TBHT.  The difference is substancial and warrants investigation.  This process will be paused until further notice

Tuesday, September 06, 2022, 14:45

Controls has been troubleshooting EVAP2.  In the process TBHT has been damaged. Arthur will take a look at it ASAP and his group will try and fix it tomorrow. 

Regarding our initial problem, it appears that when an electrical safety box was installed, the copper water lines connected to output terminals of the power supply, were moved so that they were in contact with the evaporator cage.  See the figure below.

Thursday, September 08, 2022, 12:47

 Target has been removed and a new test target (HP-FEBIAD) has been placed inside.  System left to generate enough vacuum and then testing will be performed.

Friday, September 09, 2022, 15:58

System was tested and all seems good.  This coat/sintering will continue after conditioning of graphite material

Saturday, September 24, 2022, 09:13

Continuation of process. 

IGP1= 4.3e-07 Torr

ramping @ 1A/min to 230 A on both TGHt and TBHT

Saturday, September 24, 2022, 16:28

ramped to 430A, 7.2V on TGHT and 233A, 4.2V on TBHT.  Will leave until 7 pm.

Saturday, September 24, 2022, 19:44

Starting rampdown @-2A/min TGHT -1A/min TBHT

camera offline

IGP1= 1.2e-6 Torr

Monday, September 26, 2022, 09:41

IGP1=2.2e-07 Torr.  Shutting off TBHT and TGHT.

Thursday, September 29, 2022, 09:53

Final notes: coating looks good .  Probably 3 hours at final temperature is better to prevent material degradation.

Thursday, August 25, 2022, 10:06

Target container is loaded with 379 Discs of TiC for Target and 5 extra discs for analysis on left end

Target length = 12.5

3 Ta foil heatshields and on TaC coated Ta spring on right side

Total weight including heatshields and spring = 1551.4 g   Final total weight = 1545.5 g

Final power should be ~10988 Watt

TGHT ramp up to 820A, and TGHT to 300A at 0.1A/min.

IGP1= 7.7e-7 Torr

Good vacuum =3.0e-05 Torr

Bad vacuum = 5e-04 Torr

Initial TGHT and TBHT autoramped @1A/min to 50A

TBHT mas 230A

TGHT max depends on final power

Thursday, August 25, 2022, 11:17 

Start autoramp at 1A/min to 80A on both TGHT and TBHT

Thursday, August 25, 2022, 11:54 

leaving at 80A until pressure stops rising

Thursday, August 25, 2022, 22:29

left to autoramp to 230A TBHT and 750 A TGHT since approximately 2:00 pm

Will leave ramping @1A/min to 750 A on TGHT

TBHT currently at 230A

 Friday, August 26, 2022, 07:27

TGHT = 850A, 9.3V

Started autoramp to 850A at 1A/min for TGHT

TBHT held at 230A

OMEGA = 1584C

Friday, August 26, 2022, 09:34

Target running at ~820A, 13.1 V since 9

Cooling to start between 1:15 to 1:30 pm

OMEGA reads 1668 C at top current

current reading oscillates between 812A and 828A and 13.1V  to 13.2V.

Monday, August 29, 2022, 12:21

Cooling at -2A/min for TGHT and -1A/min TBHT started on time on Friday August 26th.

Target remained under vacuum after cooling, over the weekend.

Target removed this morning and looks good. 5 discs removed for analysis

1st test polarity 1

10:12 am Begin pumping down to rough vacuum
12:50 pm begin ramping up towards 2000C. Ta tube only, welded thermocouple mount
3:08 Ta tube reached 2000C, began ramping down. The ramping up process was smooth and no hiccups happened
4:57 ramp down complete, began shutting down the evap2, will let the turbopump to slow down spin overnight.

2nd test polarity 2(swapped)

Tuesday, Aug 09 2022, 4pm begin pumping to vacuum after switching the polarity of the power supply

Wednesday, August 10, 2022, 13:09 begin ramping up

3:18 ramped to 671A. 2000C, no hiccups, everything is nominal. The thermocouple reads higher than before, about 20-30 deg C colder than pyro at high temperatures (1400C and above)

No bad connections, short circuits or unexpected overheating.

begin ramping down

ramping down was smooth, with error being the TC about 40 deg C colder than pyro at temp above 1500C

ramping done completed at Wednesday, August 10, 2022, 16:46 , shutting down evap 2 roughing and turbopump

 11am: Setting up new target tube thermocouple test

Thursday, August 04, 2022, 09:31 Test finished August 3rd afternoon. Venting now.  

Wednesday, June 29, 2022, 10:07

Ta HP-FEBIAD was coated with TaC and wrapped with Ta heat-shields (3 layers)

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

Evap 2 will be pumped down over previous night

OMEGA slope= 0.990

Good vacuum = 3.00 e-4 Torr

Bad vacuum = 5.00 e-2 Torr

IGP1= 1.2 e-06 Torr

Start autoramp @2A/min to 80 A then autoramp heat @1A/min to 150 A.  Then autoramp TGHT to 675A and TBHT to 230A.1

Wednesday, June 29, 2022, 10:13

Chamber isolation performed and no change of pressure observed.

Water leak test performed and no pressure change detected.

Starting ramp up

Wednesday, June 29, 2022, 13:23

Ramping to 675A on TGHT and 230A on TBHT @ 2A/min

Ramped TGHT to 680A, 10.6V  and held for 4 hours

Wednesday, June 29, 2022, 21:52

Started rampdown @-2A/min TGHT and -1A/min TBHT

Tuesday, June 27, 2022, early afternoon: We assembled the setup in evap2 and started the pumps leaving it running over night.

Tuesday, June 28, 2022, 09:31 Turbo pump stopped for unknown reasons a few hours after we left. Restarting the pump.

Tuesday, June 28, 2022, 10:23 Vacuum down to 1e-5T start to ramp up TGHT 1A/10s to 200A.

Tuesday, June 28, 2022, 1:20 pm, Ramped from 0-500A. thermocouple reading 900C while pyrometer reads 1600C. begin ramping down to 0A.

Tuesday, June 21, 2022, 09:43

Total number of foils: 377 ( including 6 analysis discs on the right side of the container)

Total weight = 1454 g (includes heatshields, spring and T bar)

Total length packed 15.5 cm (excluding 6 analysis discs that will be removed)

container has 3 Ta heat shields and is coated

No endcaps inserted to facilitate out-gassing

Ta coated spring at  front (right) side

Initially to ramp TGHT and TBHT to 80A at 2 A/min

then to 120A and slow down ramp when pressure begins to increase

max approx 675A 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 3.00 e -4 Torr

Bad vac at 5.00 e-2 Torr

 IGP1=3.6 e-07 Torr at start of initial ramp.

Tuesday, June 21, 2022, 13:54

IGP1= 7.1 e-05 and dropping.  Start ramp to 150A for both TGHT and TBHT @1A/min

Tuesday, June 21, 2022, 21:27

Increased ramp rate to 3A/min for TGHT to 675A

Tuesday, June 21, 2022, 22:38

Ramp up to 685 A on TGHT and leave for 4 hours. 

OMEGA = 1645 C but suspect reading not on Ta surface.

Wednesday, June 22, 2022, 02:28

IGP1=7.7e-6 Torr

OMEGA =1610C

TGHT = 685A, 10.5V

TBHT = 230A, 3V

initiate rampdown at -2A/min and -1Amin TGHT and TBHT

Monday, June 20, 2022, 14:50

A new Turbo pump was installed this morning and it was soft started.  It has operated correctly and it is ready for use.  Derek O.  installed it.

Previous pump had issues at start-up and was diagnosed as finished by Edi/

Tuesday, June 14, 2022, 08:47

Ta HP-FEBIAD was coated with TaC and wrapped with Ta heat-shields (3 layers)

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

Evap 2 will be pumped down over previous night

OMEGA slope= 0.990

Good vacuum = 3.00 e-4 Torr

Bad vacuum = 5.00 e-2 Torr

IGP1= 1.2 e-06 Torr

Start autoramp @2A/min to 80 A then autoramp heat @1A/min to 150 A.  Then autoramp TGHT to 675A and TBHT to 230A.

Tuesday, June 14, 2022, 08:49

IGP1= 0.13 Torr

*had timed out and it was off.  I RST and turned back on.*

Will wait for the pressure to drop to start heating

 Tuesday, June 14, 2022, 09:36

IGP1= 9.4e-06 Torr

Start autoramp @2A/min to 80A

Tuesday, June 14, 2022, 11:27

IGP1= 8.7 e-06 Torr Trending down. 

TGHT= 146A, 1.6V

TBHT= 146A, 1.7V

Has been ramping at 1A/min

Change ramp rate to 2A/min to 700A on TGHT and 230A on TBHT

Tuesday, June 14, 2022, 14:48

Change final current on TGHT to 675A, according to plot.  May change again. 

Currently TGHT=  537A, 7.7V 

IGP1= 4.4e-06 Torr

Tuesday, June 14, 2022, 18:46

Top temperature was 1825 Celsius at TGHT = 675A

Will start rampdown at 8:00 pm

 Tuesday, June 14, 2022, 20:01

TGHT= 675A, 10.3 V

TBHT= 230A, 3V

OMEGA= 1815C

IGP1= 3.9e-06 Torr

ramping down @-2A/min TGHT and -1A/min TBHT

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.

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