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.  

 Tuesday, March 20, 2012, 14:22

The Evaporator #2 backing pump (IEVAP2:BP1) muffler has not connected to the exhaust duct.

 See attachment#1 as to where the muffler should be connected to the exhaust ducting system.  

The Evaporator chamber is currently under vacuum; the BeO sintering process will be pending for now until the backing pump is properly installed. 

(ISAC E-fault 5880) 

 Wednesday, March 21, 2012, 13:55

Edi Dalla Valle is connecting the evaporator backing scroll pump exhaust to the existing nuclear exhaust. (See attachment#2: scroll_pump_exhause.jpg).  A filter is also added between the exhaust line 

to prevent any back flow of oil from the Evaporator #1 backing pump (An oil pump). 

Work is covered under ISAC WP# 2012-03-21-3.

The evaporator is now operational. 

 Tuesday, September 11, 2018, 10:45:

TGHT: 53.4 A   TBHT: 57.75

Actual

TGHT: 60.0A  TBHT: 59.0A

Uploaded the rest to Word doc. Screenshots included.

John Wong wrote:

Nikita Bernier wrote: John Wong wrote: Nikita Bernier wrote: John Wong wrote: Tuesday, May 15, 2012, 12:24 The HP-SIS SiC target was made on Nov 03, 2010.  The target consists of 405 discs, 18.5cm in length.  It was sintered in the Evaporator#1.  This target is going into Evap#2 for re-conditioning.  It is currently being pumped down.    Friday, May 18, 2012, 12:19  The target is wrapped with only one heat shield. Evaporator #2 Target Heater is now auto-ramping at 0.5 A/min, up to 820 A, with the maximum voltage limited at 2 V, between 2.00e-05 (Good vacuum) and 3.00e-05 Torr (Bad vacuum). Tube Heater is auto-ramping at 0.5 A/min, up to 230 A, with the maximum voltage limited at 1 V. See attachments.  Friday, May 18, 2012, 13:15 Increased TBHT voltage to 5V, and TGHT to 15V.  Currently, TBHT =83A, 0.986V, TGHT= 144A, 1.65V, IGP1 = 5.2e-7 Torr, IGP2 = 4.3e-7 Torr.  Continue ramping up...   Tuesday, May 22, 2012, 12:02 TGHT and TBHT were ramped up to 830A/13.65V (local), and 235A/3.85V, respectively.  The target was conditioned over the long weekend.      Tuesday, May 22, 2012, 12:13 Initiating the cool-down process at 5 A/min. See archive plots of the Target Heater (Attachment 1) and the Tube Heater (Attachment 2).  Tuesday, May 22, 2012, 15:24 TGHT/TBHT were ramped down to 0A.  The target has cooled for about 45 min.  All pumps and chillers are off.  The chamber has been vented.

 Monday, June 11, 2012, 12:20

After the re-conditioning, the target's end-caps vaporized.  This is something happened before (see elog entries below):

https://elog.triumf.ca/TIS/Evaporator_1/20

https://elog.triumf.ca/TIS/Evaporator_1/22

The caps were removed and yellow crystals were observed. (see attachment#1).

The D-caps will be inserted in both ends and will be re-conditioned again to see if the yellow crystals can be removed at high temperature.

Tuesday, August 13, 2024, 17:20 Pressure kept increasing when turning the turbo pump on

Tuesday, August 13, 2024, 18:00 Pressure stayed constant when turning the turbo pump on

Marla Cervantes wrote:

Tuesday, August 13, 2024, 17:20 Pressure kept increasing when turning the turbo pump on Tuesday, August 13, 2024, 18:00 Pressure stayed constant when turning the turbo pump on

Wednesday, August 14, 2024, 10:18

The turbo pump started up normally. System is purging. and tomorrow the target will be heated.

Marla Cervantes wrote:

Marla Cervantes wrote: Tuesday, August 13, 2024, 17:20 Pressure kept increasing when turning the turbo pump on Tuesday, August 13, 2024, 18:00 Pressure stayed constant when turning the turbo pump on Wednesday, August 14, 2024, 10:18 The turbo pump started up normally. System is purging. and tomorrow the target will be heated.

 Wednesday, August 14, 2024, 16:19

• Next ramping: 0.5 A/ 2min  to 250 A.

Very slow rate to allow thermal equilibrium and temperature measurements. Estimated time 3h.

Thursday, August 15, 2024, 08:21

IGP1 = 5.3e-7 Torr

Good vacuum 3e-5 Torr

Bad vacuum 5e-5 Torr

Initial ramping: 2 A/min to 200 A.

Thursday, August 15, 2024, 09:01. Pressure starting to increase at 74 A

Thursday, August 15, 2024, 09:15. Pressure stabilizing 1.8e-6 Torr. Current 103 A, voltage 1.3 V

Thursday, August 15, 2024, 09:21. Pressure increasing (116 A).

 Thursday, August 15, 2024, 09:29 Pressure dropping (Current approx. 120 A)

Thursday, August 15, 2024, 10:54

Started ramping to find a pressure peak corresponding to V vaporization.

IGP1 = 6.4e-7

TGHT = 200 A, 2.9 V, omega 1152 °C

Next ramping: 0.5 A/ 2min  to 250 A

Thursday, August 15, 2024, 11:17

Ramp seem to slow. The temperature change was too subtle (according to the omega).

IGP1 = 6.5e-7

TGHT = 205 A, 3.03 V, omega 1157 °C

Next ramping: 1 A/ 2min  to 250 A

Thursday, August 15, 2024, 11:32

Ramp changed to 0.5 A/min

Thursday, August 15, 2024, 11:54

Ramp was stopped because the pressure was increasing, suggesting the V vaporization.

IGP1 = 6.9e-7

TGHT = 222 A, 3.3 V

Omega 1210 °C, filament 1280 °C

The difference between pyrometers is negligible, suggesting that the V vaporization temperature at 6e-7 Torr of approx. 1300 °C

 Thursday, August 15, 2024, 13:15

IGP1 = 7.9e-7

TGHT = 250 A, 3.8 V

Omega 1289 °C

Thursday, August 15, 2024, 13:16

Ramp set to 0.5 A/min to 300 A

 Pressure mini-spike at 13:18

Omega reading 1291 °C

Thursday, August 15, 2024, 14:08

IGP1 = 8.5e-7

TGHT = 270 A, 4.18 V

Omega 1375 °C, filament 1400 °C

The system stayed at those conditions for 15min

Thursday, August 15, 2024, 14:11

Ramping to 0A at 2A/min

Thursday, April 07, 2016, 15:18

E-spun SiC/PAN fiber mats were produced at UBC.

12%PAN solution; 50% SiC to weight of PAN.

Materials used:

1.2g PAN, 8.8g DMF, 0.6g SiC, SDS ~0.1% to SiC

Fiber mats were heat treated at 250C in air.  Then cut into 18" discs and loaded into Ta target boat with heatshield wrapped. 

3 temperature treatments will carry out: 1200C, 1400C and 1600C

Chamber is being pumped down

 Friday, April 08, 2016, 10:02

TGHT at 285A, Temp at ~1200C.  Will remain at this temp for a few hours before cooling down. 

Some samples will be taken out for analysis. 

Next week, temperature treatment will continue at 1400C

 Friday, April 08, 2016, 14:26

Samples have been heated at 1200C for just over 4 hours.

Initiated auto-cooling at 2A/min

 Tuesday, April 12, 2016, 17:51

Heat treatment #2 - 1400C. 

Initial mass after 1200C = 0.0312g

 Monday, April 18, 2016, 12:55

Samples was heated at 1400C (TGHT maintained at ~370A) for 4 days (see attachment 1).

Chamber is vented; samples will be inspected.

 Tuesday, April 19, 2016, 17:49

Results

Sample mass after 1200C = 0.0312g

Sample mass after 1400C = 0.0294g

~5.78% mass  loss. 

Tuesday, April 19, 2016, 17:57

Heat Treatment#3: 1600C

sample mass before heating = 0.0238g (this sample is taken from the batch after it was heated at 1400C)

Chamber is being pumped.

 Thursday, April 21, 2016, 11:07

TGHT stepped up to 330A, temp measured at 1422C.

 Thursday, April 21, 2016, 12:05

TGHT at 415A/7.16V; temp at 1610C

 Thursday, April 21, 2016, 17:49

Temp dropped to 1590.  Increased TGHT to 425A; temp reads 1602A.

 Friday, April 22, 2016, 10:57

Voltage increased to 7.33V, TGHT stepped down to 418A, temp maintained at 1610A.

 Monday, April 25, 2016, 12:08

Sample was heat treated for almost 4 days.  Temperature dropped to 1578C, TGHT at 418/7.26V.  (see attachment #2)

Ramping down TGHT 2A/min.

 Monday, April 25, 2016, 16:00

Result:

Mass after 1600C = 0.0104g, 5.63% mass loss. 

Will do XRD/EDX

Thursday, August 05, 2021, 11:10

Total number of foils: 380

Total length packed 13.5 cm

container has 3 Ta heat shields.

No endcaps inserted to facilitate out-gassing

Two Ta discs at either end and three graphite discs as separators 

[Left end [ blade--no blade--blade---no blade]  Right end ]

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

Then heat manually to OMEGA ~1400 C , ramping TGHT manually and automatically  to reach 430A A (Omega slope set = 0.990)

Then temperature = 1800C

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

Good vac at 3.00 e -5 Torr

Bad vac at 5.00 e-5 Torr

Total weight into Evap2 =503.8 g

Friday, August 06, 2021, 11:33

IGP1= 8.3e-07 Torr

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

Friday, August 06, 2021, 22:34

 IGP1= 7.0e-06 Torr

TGHT= 50.1 A, 0.6 V    TBHT = 50.0A, 0.6V

Continue heating at 0.5A/min to 400A on TGHT and 230A on TBHT

Saturday, August 07, 2021, 10:11

Stopped autoramping.  Will allow some time at 63 A on both TGHT and TBHT

Saturday, August 07, 2021, 12:19

IGP1= 1.9e-05 Torr

Manually increase TGHT and TBHT to 65 A 

Saturday, August 07, 2021, 23:01

IGP1= 5.8e-06 Torr

TGHT= 64.5 A, 08V  TBHT=64.6A, 0.8V

Ramp up manually while monitoring pressure 

Sunday, August 08, 2021, 08:46

IGP1= 6.0e-06 Torr

TGHT = 69A, 0.85V  TBHT = 69A, 0.90V

ramp up manually  

Monday, August 09, 2021, 08:54 

IGP1= 1.38e-05 Torr

TGHT= 90.0 A, 1.1V, TBHT= 90.0A 1.3V

Start autoramp at 0.5 A/min on both TGHT and TBHT to 400A and 230A respectively.

Changed bad vacuum to 5e-04 Torr

Monday, August 09, 2021, 21:37

IGP1= 6.6e-06 Torr

TGHT= 300.3 A, 5.0 V, TBHT = 233.0 A, 4.1V

 Increase ramp rate to 2A/min for TGHT to 400 A,

OMEGA = 1430 C

Monday, August 09, 2021, 22:09

Will autoramp at 2A/min up to 424A as per regression line on attached file 

Monday, August 09, 2021, 22:58

Temperature drop on OMEGA.  Unexpected.  Will lower current on TGHT to 418A and keep there for 4 hours.  OMEGA may not be reliable 

Tuesday, August 10, 2021, 3:16

IGP1=8.8e-07 Torr

TGHT = 414A, 7.5V TBHT = 233A, 4.1V

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

Tuesday, August 10, 2021, 10:35

IGP1= 3.6e-07 Torr

Dismount

Some discs, especially end sections were coated with a golden layer.  

 Tuesday, October 29, 2013, 15:50: Pumping down

Wednesday, October 30, 2013, 09:32: Turbo started

Wednesday, October 30, 2013, 14:50: The Cu-bars were heated to 600A and 300A for TGHT and TBHT respectively.

Wednesday, October 30, 2013, 15:17: PS off. Turbo off.

Results can be found on DocuShare and in the attached plot.