Wednesday, March 22, 2023, 22:29

Cartridge #9 loaded with 213 plus 3 analysi discs

To be reduced inside a Ta container tube.  Tube wrapped in 3 Ta foil heatshields.

Reduction for 4 hours and then 8 hours @ 450A

Good Vacuum: 5.0e-04 Torr

Bad Vacuum: 5.0e-02 Torr

Initial pressure is 3.71e-06 Torr

Wednesday, March 22, 2023, 22:33

Autoramping to 400A @ 1A/min

Thursday, March 23, 2023, 06:57

Starting heating at 2A/min

Currently at 400A and 4.5V

IGP1= 9.6e-06 Torr

At around 500A, the reduction was observed.  Current manually increased to 508 A and left there for remainder of four hours.  4 hours will be done at 1210 pm, then will ramp down to 450 and 8 hours

Thursday, March 23, 2023, 12:01

IGP1= 7.6 e-06 Torr

508 A, 6.0 V TGHT

Start rampdown to 450 @ -2A/min

Thursday, March 23, 2023, 20:27

IGP1= 2.36e-06 Torr

TGHT = 452A, 5.3A

Starting ramp down @-2A/min

Wednesday, October 11, 2023, 9:36

Cartridge #10 loaded with 213 plus 3 analysi discs

To be reduced inside a Ta container tube.  Tube wrapped in 3 Ta foil heatshields.

Reduction for 4 hours and then 8 hours @ 450A

Good Vacuum: 5.0e-04 Torr

Bad Vacuum: 5.0e-02 Torr

Initial pressure is 2.4 e-06 Torr

 Wednesday, October 11, 2023, 10:56

Starting heat ramp at 2A/min to 60A

First pressure bump observed at 60A

Allowing pressure to restabilize

Wednesday, October 11, 2023, 13:12

IGP1=2.6 e-5 Torr

continuing to heat at 2A/min

Wednesday, October 11, 2023, 13:35

another pressure bump observed around 90A (should go slowly in these current range).  Aborted ramp, waiting for pressure to stabilize.

pressure rose to around 2.5e-02 Torr (close to our bad pressure)

Wednesday, October 11, 2023, 13:52

IGP1=5.4e-04 Torr Start ramp at 2A/min

Wednesday, October 11, 2023, 17:53

Pressure has started to drop so increased ramp to 4A/min

 Wednesday, October 11, 2023, 18:18

 Second small pressure bump observed at 482A and 5.0 V.  Pressure falling.  Will leave at 500A for 4 hours . 

 Wednesday, October 11, 2023, 22:00

IGP1= 8.0 e-06 Torr

TGHT=500A, 5.2V

Initiate rampdown to 450A and will leave there for 8 hours

Thursday, October 12, 2023, 07:02

Initiate rampdown to zero.  IGP1=3.21e-06 Torr

TGHT= 450A, 4.6V

 Tuesday, April 09, 2024, 14:42

Cartridge #16 loaded with 213 plus 3 analysi discs

To be reduced inside a Ta container tube.  Tube wrapped in 3 Ta foil heatshields.

Reduction for 4 hours and then 8 hours @ 450A

Good Vacuum: 5.0e-04 Torr

Bad Vacuum: 5.0e-02 Torr

Initial pressure is 2.4 e-06 Torr

Tuesday, April 09, 2024, 14:42

Start ramp @2A/min to 120A then wait for pressure drop to continue.

Tuesday, April 09, 2024, 16:51

Set ramp to 2A/30s to 480A

Wednesday, April 10, 2024, 00:02

Ramping down to 450 A

Thursday, April 11, 2024, 09:56

Cool down Wednesday morning

Will be left under vacuum in EVAP1 due to hotlab closure.

Thursday, September 12, 2024, 06:19

Cartridge #19 loaded with 232 discs including 5 analysis discs

To be reduced inside a Ta container tube.  Tube wrapped in 3 Ta foil heatshields.

Reduction for 4 hours and then 8 hours @ 450A

Good Vacuum: 5.0e-04 Torr

Bad Vacuum: 5.0e-02 Torr

Initial pressure is 3.12 e-06 Torr

Thursday, September 12, 2024, 06:20

Starting step one in ramping

Thursday, September 12, 2024, 09:12  

Pressure lowered after passing outgas peak. 

IGP1= 2.5e-05 Torr

will continue with step 2 of ramping

 Thursday, September 12, 2024, 14:46

At 115A outgas peak observed and current ramped down from 120A t 115A.  Allowing pressure to drop before continuing ramp.

Roughing pump issue.  Cooling, turning pumps off until vacuum group can take a look.

Friday, September 13, 2024, 14:39

Roughing pump seems ok.  Restarting ramp at 1A/min to 115A

Friday, September 13, 2024, 17:38

Starting ramp up at 2A/min to 520A (will monitor pump and outgassing)

Saturday, September 14, 2024, 07:44

inflection point at aroung 450A

Saturday, September 14, 2024, 07:48

pressure started dropping at 466A, but some sporadic peaks observed.  Will heat to 488A and leave for 4 hours

Saturday, September 14, 2024, 20:23  

 ramping down after 8 hour conditioning

IGP1= 2.45e-06 Torr

Tuesday, September 17, 2024, 06:45

Cartridge #20 loaded with 224 discs plus 3 analysis discs

To be reduced inside a Ta container tube.  Tube wrapped in 3 Ta foil heatshields.

Reduction for 4 hours and then 8 hours @ 450A

Good Vacuum: 5.0e-04 Torr

Bad Vacuum: 5.0e-02 Torr

Initial pressure is 1.5 e-06 Torr

Tuesday, September 17, 2024, 06:47

Starting initial ramp @ 2A/min to 60A

Tuesday, September 17, 2024, 10:05

Started ramp at 1A/min to 90A

Wednesday, September 18, 2024, 07:05

Reduction at 480A held for 4 hours then 8 hours at 450A

Tested by increasing 10A and significant increase in pressure observed (no real peak). 

Started rampdown at -2Amin

Thursday, September 19, 2024, 22:44

Cartridge #21 loaded with 211 discs including 3 analysis discs

To be reduced inside a Ta container tube.  Tube wrapped in 3 Ta foil heatshields.

Reduction for 4 hours and then 8 hours @ 450A

Good Vacuum: 5.0e-04 Torr

Bad Vacuum: 5.0e-02 Torr

Initial pressure is 1.6 e-06 Torr

Friday, September 20, 2024, 08:47

ramped to 300 A and allowed pressure to drop. Pressure stable around 5.0 e-5 Torr.  Will continue ramp at 2A/min

Friday, September 20, 2024, 12:30

At 500A the pressure stops rising.  Will leave for 4 hours. 

Tuesday, September 24, 2024, 15:46

reduced for 4 hours then ramped down to 450A at -2A/min

After 8 hours ramped down to zero A at -2A/min

March 23, 2011

12:30: Target oven is wrapped with 3 Ta-heat shields.  Pumping down evaporator

18:24: IEVAPIG1 is reading at 4.55e-6 Torr.  The p/s will be turned on tomorrow since there is no ISAC Ops on site. 

March 24

11:57: Evaporator has pumped down over night.  Vacuum @ 2.01e-6 Torr.  

14:42: TGHT @ 20A, Vac @ 1.65e-6 Torr.

14:52: TGHT @ 40A, Vac @ 1.66e-6 Torr.

14:52: Auto Heating begins: TGHT to max 820A.  Incrementing if vac < 4.5e-5 Torr, backing off if vac > 6.5e-5 Torr.

 16:04: TGHT @ 181A, vac @ 7.59e-6 Torr.

18:03: TGHT @ 420A, vac @ 4.71e-6 Torr.   (See attachment 2 for TGHT/IG1 for the past 4 hours)

March 25,

11:15:  TGHT has been at 820A for 14hr.  Vac @ 4.27e-6 Torr.  (See attachement 3 for TGHT/IG1 for these past hours)

11:17:  Auto cooling down is in progress...

17:21:  Auto cooling down ended at TGHT ~100A.  The TGHT was tabbed down manually from 100A to zero.  (See attachment #4 for the cooling down progress)

John Wong wrote:

March 23, 2011 12:30: Pumping down evaporator 18:24: IEVAPIG1 is reading at 4.55e-6 Torr.  The p/s will be turned on tomorrow since there is no ISAC Ops on site.  March 24 11:57: Evaporator has pumped down over night.  Vacuum @ 2.01e-6 Torr.   14:42: TGHT @ 20A, Vac @ 1.65e-6 Torr. 14:52: TGHT @ 40A, Vac @ 1.66e-6 Torr. 14:52: Auto Heating begins: TGHT to max 820A.  Incrementing if vac < 4.5e-5 Torr, backing off if vac > 6.5e-5 Torr.  16:04: TGHT @ 181A, vac @ 7.59e-6 Torr. 18:03: TGHT @ 420A, vac @ 4.71e-6 Torr.   (See attachment 2 for TGHT/IG1 for the past 4 hours) March 25, 11:15:  TGHT has been at 820A for 14hr.  Vac @ 4.27e-6 Torr.  (See attachement 3 for TGHT/IG1 for these past hours) 11:17:  Auto cooling down is in progress... 17:21:  Auto cooling down ended at TGHT ~100A.  The TGHT was tabbed down manually from 100A to zero.  (See attachment #4 for the cooling down progress)

 All the pumps are off.  The evaporator will be vented next week. 

Monday, May 14, 2012, 15:04

Due to the differences in the use of the graphite foils in past SiC targets (C-grv foil from Alpha Aesar) and the newly prepared SiC#27 (C-grv foil from Ceramaterial), the out-gassing period for SiC#27 took over 6 days compared to 3 days for the vacuum to come down (see https://elog.triumf.ca/TIS/Evaporator_1/47). 

A few pieces of the new graphite foil is loaded on the target boat to test the out gassing reaction. 

The Evap #1 chamber has been pumped down to low 10e-5. 

Set to same parameter, see attachment#1

Initiated auto heating...

 Tuesday, May 15, 2012, 14:46

The target heater was ramped up to 820A.  There was so much out gassing as the temperature was increased.  The voltage did not hold at that current and the target heater was tripped off after the midnight.  (see attachment #2)

After the chamber was vented, it was discovered that the target boat's legs were bent due to over heating.  Both end of the targets where they touched the base got vaporized.  The boat was also got squeezed.  (see attachment #3).  

However, the heated graphite foils (~1600C at 820A) looks pretty good.  As per the supplier, CeraMaterials, the graphite was treated to 2000C.  See attachment #4 for the certificate.

 Monday, May 16, 2016, 15:51

full clean of inside evap1 this afternoon.

Tuesday, August 23, 2016, 17:33

Target boat coated with TaC (sprayed) and wrapped with Ta-heat shield. 

chamber is currently being pumped down. Vac currently at 3.3e-5Torr. 

TGHT to be ramped up to 580A.

Initiate autoramping at 0.1A/min

 Wednesday, August 24, 2016, 10:34

TGHT at 111A/1.07V.  Vac at 7.5e-6 Torr and coming down.

Increase ramping rate to 2A/min.

 Thursday, August 25, 2016, 12:01

TGHT has been stabilized at 580A/6.89V for over 24 hours.  Vac at 7.5e-6 Torr.

Initiated cooling at 2A/min.

 Monday, September 12, 2016, 17:30

Container was properly sintered.

 Wednesday, June 07, 2017, 10:00-12:00: Cooling was split/routed from two bottom lines with tees and run to the turbo pump.

 INIFICON -  BPG - SN: 232

PN: 353-573

Tuesday, August 18, 2020, 10:38: Control head for IGP1 swapped with bagged one.

Had been roughing.

Tuesday, August 18, 2020, 12:37: Turbo pump on. 

Tuesday, August 18, 2020, 12:54: Vacuum @ 1.28e-05T & dropping. 

Thursday, March 31, 2021, 14:42

EVAP1's TGHT has been tripping even when the pressure is below the tripping limits. The temperature of the turbo pump and the TGHT's power supply were monitored discarding the possibility of tripping due to the overheating of these pieces of equipment.

Gelo has been monitoring the IGP1 during carbothermal reductions to pinpoint the tripping issue, below is Gelo description to the issue and the patch he implemented to fix it.

"IGP loses its STATON (On status) if the value from the device is not within the valid voltage window (0.7 to 10 V). IEVAP:IGP1 for some reason goes to 0V for a few seconds then goes back up to where it left off.

Prior to the latest software updated, I added a 2 second delay in the code so that any invalid signal <=2s will be ignored.

Here is the data that you sent me specifically looking at when it tripped. I also attached the data that you sent me.  << File: 310321-P2N-3-CR (1).txt >>

TGHT Voltage and TGHT current are both read from the same PLC module, which tells me that the PLC module is not likely the issue since we were still reading other signals when IGP was reading 0.

For the new update, I adjusted the delay to 5 seconds since the signal drop seemed like it was about 2s and was enough to lose the IGP STATON bit which tripped TGHT.

The delay only applies for the STATON status which can also be described as reading OK status in this case. Any other trip will be instantaneous and work as normal. 

STATON is “ANDed” with other trips. i.e. IEVAPIGP_LESS10MTORR = IEVAPIGP1_RDVAC < 10mTorr AND IEVAPIGP1_STATON."