Darwin Ortiz Rosales wrote:

John Wong wrote: Carla Babcock wrote: 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  Wednesday, April 26, 2023, 22:12 TGHT = 400A, 6.1V; TBHT = 274A/3.7V. Temp is holding sturdy ~1100 C and will leave it overnight. Pressure is coming down, currently at 8.8 e-6 Torr.  See attachment for the overview.  TGHT will continue to ramp up tomorrow morning; check the pressure to ensure it has come down below 5e-6 Torr before proceeding.  Refer to the instructions for details.         Thursday, April 27, 2023, 06:27 IGP1= 1.7e-06 Torr OMEGA= 1097 C TGHT= 400A, 6.2V TBHT= 273A, 3.7 V Starting ramp up of TGHT @0.2A/min set to 550A

 Reached 550A on TGHT (paused there until I realized it was stopped) then resumed ramping to 580A at 0.2A/min. Saw both vacuum spikes before 550A. Attaching screenshot from John.

Darwin Ortiz Rosales wrote:

John Wong wrote: Carla Babcock wrote: 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  Wednesday, April 26, 2023, 22:12 TGHT = 400A, 6.1V; TBHT = 274A/3.7V. Temp is holding sturdy ~1100 C and will leave it overnight. Pressure is coming down, currently at 8.8 e-6 Torr.  See attachment for the overview.  TGHT will continue to ramp up tomorrow morning; check the pressure to ensure it has come down below 5e-6 Torr before proceeding.  Refer to the instructions for details.         Thursday, April 27, 2023, 06:27 IGP1= 1.7e-06 Torr OMEGA= 1097 C TGHT= 400A, 6.2V TBHT= 273A, 3.7 V Starting ramp up of TGHT @0.2A/min set to 550A

 Thursday, April 27, 2023, 22:04

TGHT has reached 580A/10.33V. Temp = 1540C. 

The two out-gassing peaks were observed: 1st peak around 1300C and 2nd peak 1370C.  See attachments 1 & 2.

A few minutes after TGHT reached to 580A, there was a small jump in TGHT current/voltage and also the pressure, but didn't notice any change in the temp, see attachment 3&4. 

Pressure is currently at 3.4e-6 Torr; will hold TGHT until pressure reaches close to 1e-6 Torr before cooling down. 

 Friday, April 28, 2023, 01:06

Pressure has reached 1.8 e-6 Torr; TGHT has been holding at 580A for 3.5 hrs, a slight increase in voltage, reading at 10.45V and temperature, 1548C.  See attachment #5 for overview.

Initiating auto-cooling TGHT at -2A/min, TBHT at -1A/min.

John Wong wrote:

Darwin Ortiz Rosales wrote: John Wong wrote: Carla Babcock wrote: 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  Wednesday, April 26, 2023, 22:12 TGHT = 400A, 6.1V; TBHT = 274A/3.7V. Temp is holding sturdy ~1100 C and will leave it overnight. Pressure is coming down, currently at 8.8 e-6 Torr.  See attachment for the overview.  TGHT will continue to ramp up tomorrow morning; check the pressure to ensure it has come down below 5e-6 Torr before proceeding.  Refer to the instructions for details.         Thursday, April 27, 2023, 06:27 IGP1= 1.7e-06 Torr OMEGA= 1097 C TGHT= 400A, 6.2V TBHT= 273A, 3.7 V Starting ramp up of TGHT @0.2A/min set to 550A  Thursday, April 27, 2023, 22:04 TGHT has reached 580A/10.33V. Temp = 1540C.  The two out-gassing peaks were observed: 1st peak around 1300C and 2nd peak 1370C.  See attachments 1 & 2. A few minutes after TGHT reached to 580A, there was a small jump in TGHT current/voltage and also the pressure, but didn't notice any change in the temp, see attachment 3&4.  Pressure is currently at 3.4e-6 Torr; will hold TGHT until pressure reaches close to 1e-6 Torr before cooling down.   Friday, April 28, 2023, 01:06 Pressure has reached 1.8 e-6 Torr; TGHT has been holding at 580A for 3.5 hrs, a slight increase in voltage, reading at 10.45V and temperature, 1548C.  See attachment #5 for overview. Initiating auto-cooling TGHT at -2A/min, TBHT at -1A/min.

 Friday, April 28, 2023, 09:27

IGP1= 1.20e-07 Torr

Will dismount target around 10:15 am

Heating curve below.  Non-linear behavior

 Final weight = 517.08 g

Target looks good see attached picture

Saturday, March 04, 2023, 08:29

Ta LP-FEBIAD with 369 discs plus 5 removable discs wrapped with 3 Ta heat-shields (in layers)

Evap 2 will be pumped down over previous night

Desired temperature = 1500 C as in Elog #52 , TGHT will be ramped up to 300 A and then adjusted manually to 1500C if temperature readings are ok

otherwise will use plot from coating sintering to approximate 1500C.

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

Good vacuum = 5.00 e-4 Torr

Bad vacuum = 5.00 e-2 Torr

IGP1= 3.4 e-07 Torr

Start autoramp @2A/min to 80 A then autoramp heat @1A/min to 230 A (both TGHT and TBHT)

  Then autoramp TGHT to 300 A

-

Saturday, March 04, 2023, 22:27

At 332 A, 5.6V on TGHT, 230 A, 3.3 V TBHT

OMEGA = 1370 C

Will autoramp to 375A on TGHT @0.25A/min then leave for 4 hours at 1500C

Cooling should start at 6 am march 5th

OMEGA reading 1498 @ 2 am

Sunday, March 05, 2023, 06:03

OMEGA reading 1442 C @550am

ramped up to 394 A on TGHT and OMEGA reads 1500 C

will leave for 40 minutes than test ramp up to observe outgassing

d until 715 am then begin rampdown.

Sunday, March 05, 2023, 07:22

ramped to 425 to test further outgassing temperature increase observed but only while increasing current.

OMEGA = 1590 C

TGHT= 425A, 7.6V

TBHT= 230A, 3.3V

IGP1=2.0e-06 Torr

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

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

Thursday, February 09, 2017, 23:26

There are two types of samples being test for thermal stability:

1.  SiC-SiO2-Lys nanofiber mats

2.  SiC pellets

(see Lab Book for more info)

Desired temperature: ~1500C

One-Ta heat shield is used, est. TGHT 450A.

 Thursday, February 09, 2017, 23:38

TGHT currently at 322A/5.28V, OMEGA 1204C.

Vac 2.9e-6 Torr.

 Friday, February 10, 2017, 08:58

TGHT at 400A, temp at 1425C for 8 hours.

Decided to cool down for analysis.  Check for carboreduction for SiO2 at 1400C.  Then continue to ramp up to 1500C. 

Ramping down at 2A/min

 Friday, February 10, 2017, 10:47

Rapid out-gas (2.7e-6 to 3.8e-6 Torr) from TGHT 330A until current stopped at 400A (see attachment).  Could be the evolution of O2 from SiO2... 

Wednesday, March 30, 2016, 11:30

Polycarbosilane fibers were prepared by UBC MTRL. 

Two samples with different fiber sizes were loaded in target boat and wrapped with heat shields.

Samples will be heated up to 1600C.

Chamber is currently being pumped down

 Thursday, March 31, 2016, 16:49

Ramping up TGHT to 300A at 1A/min

 Tuesday, April 05, 2016, 13:02

Samples was heated at 1600C for about 3 hours.  

Then it was cooled down at 2A/min. 

The process is complete. 

Boat with attached thermocouple type C with AREMCO ceramabond glue installed in evap2 the 30-07-2020

Vacuum 3.2e-6torr in IGP1 after night with the roughing pump and morning with turbo.

TGHT heater on.

ramp up started

1A/20s up to 200A

Thermocouple de-attached at about 400A.

Target cooled down. 1A/10s

Turbo and roughing pump off. System left with present vacuum over night. Tomorrow inspection.

Friday, March 31, 2017, 12:21

Two compressed pellets loaded into the target boat and wrapped with Ta foil.  (see lab book p32 for details).

Chamber is pumping down.

Desired temp 1550C, TGHT expected to be around 400A.

 Friday, March 31, 2017, 16:31

Auto-ramp at 0.5A/min to reach 350A.

 Saturday, April 01, 2017, 12:30

TGHT reached to 350A/5.7V, temp around 1200C - notice voltage is much lower than previous process (ID 351), possible target/heat shield shorted therefore lower temp observed. (This should not cause any damage to the container.) 

Continue to ramp up to 400A.  Notice some evolution of gasses similar to the previous process (ID351) during ramping up of TGHT around 220A . (see attachment1)

 Saturday, April 01, 2017, 13:52

TGHT reached to 400A/6.7V; temp stabilized at 1400C. 

Tap up to 1550, TGHT 456A/8.08V (3.7KW, about 1KW higher than before).

Pressure coming down (see attachment 2)

Hold temp for several days.

 Saturday, April 01, 2017, 17:22

Temp went up by 10C. Lowered TGHT to 450A.

Monday, October 24, 2016, 17:43

Two samples were prepared and loaded into the target boat with 1 layer of heat-shied as shown in the attachment#1.

Ingredients used: np-SiC and very small about of 5% PVA to hold the powder together. 

Samples were dried in the oven at 110C before loaded in Evap#2. 

After dried:

Sample #1 (larger graphite boat, mass =0.3779) = 0.4259g (PVA mass unknown due to solution leaking out from the boat)

Sample #2 = 0.2306g (with 5% PVA of 0.4111g)

Test temperature at 1600C, expect TGHT to be around 400A. 

Monday, October 24, 2016, 17:50

Ramping up TGHT to 300A at 0.5A/min. Vac at 2.3e-6 Torr. 

 Tuesday, October 25, 2016, 12:59

TGHT reached to 300A and stabilized for 10 hours.  OMEGA temp reader at 1150C

Continue to ramp up TGHT

 Wednesday, October 26, 2016, 15:49

TGHT was ramped up to 450A/7.91V; the temp readers on MIKON and OMEGA were 1489 and 1535, respectively (see attachment).

The temperature was much lower than the previous two tests (see elog #296 and #335).  Not sure why... 

Will do composition analysis on the sample... 

Cooling down at 2A/min.

Friday, March 10, 2017, 17:29

Three B3 pellets are loaded into the container for thermo test. 

(see lab book1 Pg 26, 28-30 for more detail about the materials)

Desired temp ~1500C; one long-sheet of Ta foil is used, est 400A. 

Auto ramping 0.5A/min to 300A first.  Check later...

 Saturday, March 11, 2017, 11:58

Increased TGHT from 300A to 350A last night at ramping rate of 0.5A/min.

Tapped up further from 350A to 400A, 6.92V (2.8kW), Temp measured at ~1550C. 

Pressure peaked at 1.5e-6 Torr and coming down when ramping TGHT from 350A to 400A. (see attachment1)

Will remain at the current.  Continue monitoring..

 Monday, March 13, 2017, 01:14

Temp was held at 1550C for about 1.5days. Vac stabilized at 3.08e-7 torr.  TGHT 400A/6.94V.

Initiated cooling at 1A/min. 

Next, Materials inspection.

 Monday, March 13, 2017, 11:24

Target has been at room temp for about 4 hours.  Venting chamber.

Monday, November 06, 2017, 18:21

Samples of Horn and Probe - npSiC. see pg 74.

6 samples in total, to be heated to 1550C, about 450A.  Set ramping rate at 0.2A/min.  

Chamber pumping down

 Tuesday, November 07, 2017, 15:01

TGHT reached to 450A/8.2V, temperature measured at 1460C.  See attachment 1.

Increased ramping to 480A, targeting 1550C.

 Tuesday, November 07, 2017, 22:26

Samples have been heating at 1550C with TGHT at 480A/8.78V for about 8 hours.

Vacuum stabilizes at 8.4e-7 Torr.

Initial cooling at 2A/min.

 Wednesday, November 08, 2017, 10:36

Venting chamber.

Wednesday, October 04, 2017, 16:37

3 samples of npSiC/PAN cast-pellets, see lab book p. 57 for details.

Desired temperature 1550C, expected TGHT ~450A.

Chamber pumped down.

TGHT ramping at 0.2A/min

 Friday, October 06, 2017, 10:45

TGHt at 450A/7.7A, temp at 1510C.  (p.s voltage is lower than before, elog 389).

Tapped up to 466A/8.08v, temp reached to 1550C.  A slight increase in pressure when tapping up TGHT. (see attached screen capture)

Will maintain heating temperature for several days before cooling down

 Tuesday, October 10, 2017, 10:50

Samples was heated for several days at 1550C. 

Cooling down initiated at 2A/min.

 Tuesday, October 10, 2017, 18:07

Chamber is vented.

Process done

Wednesday, March 13, 2013 

Thermocouple channels (see attached PDF for photos)
T1 - Left target leg at tube
T2 - Between cooling fins close to tube, left side
T3 - Supply water HS
T4 - Return water HS

Friday, March 22, 2013

Test not conducted. Target removed.

Monday, March 10, 2014, 11:45

The chiller tripped off on March 7, 2014.

• Water is not flowing into the chiller; paddle wheel shows no signal.
• Tried turning on the chiller locally; a few seconds later, it tripped off. 
• Motor is not responding;
• EPICS is not responding;
• All other water flow signals to TGHT, TBHT, HS, are responding;

Continue investigating...

 Monday, March 10, 2014, 14:36

The water line to the chiller is disconnected, and is re-connected straight to the TGHT power supply.  The paddle wheel is responding - the cooling line in the power supply is not blocked.

It is confirmed the chiller is broken. 

Will discuss if we can use the Evaporator without a chiller but with the DI water connected directly to the TGHT power supply....

Friday, March 14, 2014, 14:50  

The chiller was replaced with a "new" one.  

Checked the chiller interlock - It's working.  

The evaporator is now operational. 

 Friday, March 21, 2014, 16:19

Note about Auto-ramping program.

Previously the auto-rampiong program takes the Chiller as part of the reference to the interlocks.  Because the New chiller is not connected to EPICS; all the references to the Chiller on the auto-ramping program has been removed in order for it to function. 

 Thursday, April 24, 2014, 17:25

The purpose of this experiment is to see if the carbon mesh is suitable for coating and sintering with uranium carbide.  For this test, the mesh is coated with WC slurry (previously prepared).

 The carbon mesh disks are bought from ERG aerospace corporation; the specifications of the mesh can be found on the link:  http://www.ergaerospace.com/RVC-properties.htm

Photos, EDX, SEM, RGA, etc... and be found on this link:  https://www.dropbox.com/sh/6ic932wu8yl9ad2/7rHFTiSzLY

Thursday, April 24, 2014, 17:51 

TEST #1:  Carbon Mesh, WC - RF sputtered - Then WC coated and sintered.

Target boat is loaded with a piece of WC coated carbon mesh (1/4 size cut out with the laser cutter).  Chamber is pumping down, currently at 3.2e-6 Torr.

HS water valve open - no leaks are detected. 

TGHT will be ramped up to 500A at 1.0A/min. 

RGA is running.  

Material temp will be measured... 

Monday, May 05, 2014, 17:35

Test #1:

TGHT was ramped up to 680A/13.77V.  Vacuum was at 1.62e-6 Torr (and coming down).  Carbon mesh was heated up to 1900C.   See the link to the dropbox above for more results.

Monday, May 05, 2014, 17:39

Test #2:  Carbon mesh (pure) coated with WC - then sintered. 

Chamber has been pumped down to 3.5 e-6 Torr. 

Sample will be heated up to 500A at 1.0A/min.  (Then step up to 680A while monitoring the vacuum).

RGA is running. 

 Wednesday, May 07, 2014, 14:36

Observations:

TGHT was at 650A/12.96V for 6 hrs and temperature was measured at 1930C. 

At some point after that (~20:40hr on May 6), the voltage went up to 14.77V (current remained constant at 650A), the temp went up 2110C - for only about 45 minute before the voltage dropped

back down to 12.53V and the temperature ~1800C.  Is the boat creaking more??? There were a few crack lines on the boat after Test#1. 

Today, TGHT was raised up to 725A and after an hour at that current the temperature was measured at 1930A. 

Now, at Wednesday, May 07, 2014, 14:47 - Lowered the current back to 685A/13.78V - temperature measured at 1900C. 

One thing to note... the vacuum is showing a lot of spikes but remains at around 7.5e-7 Torr. 

The RGA/Current/Voltage/Temp can be found here: https://www.dropbox.com/sh/1yaa7ez3nydl67m/8v4ZRT2slq

Thursday, May 29, 2014, 16:56 

The process is done. Chamber was vented...

 2020-10-09 9:48 The target was installed the day before and left pumping over night. IGP1=4.7e-7Torr. leak check when water on, ok. Setting ramp up

 2020-10-09 10:16 Ramping up the target to 50A, 1.5A/30s. All good. Going to 200A same rate.

 2020-10-09 11:11 Target at 200A. Pyrometer 1170degC. ramping to 300A same rate. 

 2020-10-09 11:51 Target at 300A. Pyr. 1510. Ramping to 400A same rate.

 2020-10-09 12:27 Target at 400A. Pyr. 1820. Ramping to 500A same rate.

 2020-10-09 13:01 Target at 500A. Pyr. 2100. Ramping down to 0A 2A/30s.

Laura Lambert wrote:

Thursday, October 23, 2014, 15:34 *See elog #142 for target description* one endcap still in place, one removed for OMEGA-IR2C beam to reach material [see pic] no heat shields currently being pumped down  Friday, October 24, 2014, 11:34 EVAP2 pumped down overnight. IGP1 = 7e-7 Torr HS water valves opened, no leaks detected. TGHT will be ramped up to 1400C TBHT will be ramped up to 230A  Friday, October 24, 2014, 14:32 TBHT reached 230A, TGHT reached 1400C Stepped TGHT up manually to 1600C; TGHT = 693A, 10.6V [see pic]  Friday, October 24, 2014, 15:58 TGHT = 760A, 12.07V [local read back] = setpoint. epics readback TGHT = 754.8A, 11.76V OMEGA = 1700C Friday, October 24, 2014, 16:26 OMEGA = 1800C epics readback TGHT = 828.7A, 13.15V Friday, October 24, 2014, 16:34 OMEGA = 1900C epics readback TGHT = 899A, 14.53V Friday, October 24, 2014, 16:46 OMEGA = 2000C epics readback TGHT = 967A, 15.8V MIKRON target spot on SiC = 1650C, e = 0.97

 Tuesday, November 04, 2014, 15:59

Target was heated up to 2000C and last for about 1.5 days before the right leg (ionizer points into the page) broke off. 

Interesting discovery...  The "yellowish" crystals are forming on the discs. 

Suspecting a phase transformation of 6H (hexagonal/- alpha SiC (hexagonal) polytype to 3C(cubic) - beta SiC

More study needs to be done... 

See elog # 168.

The leg of this target was repaired in the Machine shop. 

THIS TARGET WILL NOT BE USED ONLINE -  IT WILL BE USED FOR OFFLINE R&D PURPOSES.

 Thursday, October 23, 2014, 15:34

*See elog #142 for target description*

one endcap still in place, one removed for OMEGA-IR2C beam to reach material [see pic]

no heat shields

currently being pumped down

 Friday, October 24, 2014, 11:34

EVAP2 pumped down overnight.

IGP1 = 7e-7 Torr

HS water valves opened, no leaks detected.

TGHT will be ramped up to 1400C

TBHT will be ramped up to 230A

 Friday, October 24, 2014, 14:32

TBHT reached 230A, TGHT reached 1400C

Stepped TGHT up manually to 1600C; TGHT = 693A, 10.6V [see pic]

 Friday, October 24, 2014, 15:58

TGHT = 760A, 12.07V [local read back] = setpoint.

epics readback TGHT = 754.8A, 11.76V

OMEGA = 1700C

Friday, October 24, 2014, 16:26

OMEGA = 1800C

epics readback TGHT = 828.7A, 13.15V

Friday, October 24, 2014, 16:34

OMEGA = 1900C

epics readback TGHT = 899A, 14.53V

Friday, October 24, 2014, 16:46

OMEGA = 2000C

epics readback TGHT = 967A, 15.8V

MIKRON target spot on SiC = 1650C, e = 0.97

Tuesday, August 14, 2012, 15:44

This SiC target was prepared in May 2011 with the Evaporator#1.  The target will not used for online. 

Two endcaps were inserted with the new expansion tool.  The target will be heated up to the normal operating condition (TGHT =580A, TBHT = 230A). 

The chamber is currently being pumped down. 

 Tuesday, August 14, 2012, 16:21

Earlier, the Cu-heat shield was removed from the evaporator to replace the insulators, so all the seals were placed with new ones.  However,

there seems to be some leaks after the HS cooling water is turned on.  (see attachment#1).

The TP off, and the chamber is vented for investigation.

 Tuesday, August 14, 2012, 17:25

All the 3 seals for the Cu-heat shield were replaced.  The chamber has been pumped down and the HS water valve is open.  No leaks are detected.

Tuesday, August 14, 2012, 17:29

Initiated auto-ramping at 2A/min for both TGHT and TBHT.

Parameter constraints: good vac @ 2.0e-5 Torr, bad vac @ 3.0e-5 Torr.

Currently, IG1 @ 6.5e-6 Torr.

 Wednesday, August 15, 2012, 09:52

TGHT and TBHT have reached to 520A and 230A, respectively, and have stayed at the currents for about 10 hours. (see attachment #2) 

IG is currently at 7.7e-7 Torr.  

Initiating auto-cool down at 2A/min. 

 Thursday, August 16, 2012, 11:23

Chamber is vented.