Laura Lambert wrote:

Laura Lambert wrote:  Thursday, December 07, 2017, 09:57 Each endcap is wrapped in a separate piece of graphite foil and placed in a target boat. There are also 4 coated springs, 2 on each side of the stack of endcaps. The boat is wrapped with 3-layers of Ta heatshields. Chamber pumped down overnight. OMEGA slope = 0.98 HS water valves opened, no leaks detected. IGP1 = 5.9e-7 Torr IGP2 = 4.0e-7 Torr Tapping up manually. Final desired temperature = 1800C    Thursday, December 07, 2017, 11:51 TGHT tripped off. Turns out the vacuum limits have not been fully updated when they should have been and the old ones still apply. IGP1 reached 8e-5 Torr which tripped off the system. TGHT = 80A, 1.05V when the system tripped.

 Friday, December 08, 2017, 15:29

Interlocks have been updated.

TGHT should now run up to 500mTorr before tripping off.

Laura Lambert wrote:

Laura Lambert wrote: Laura Lambert wrote:  Thursday, December 07, 2017, 09:57 Each endcap is wrapped in a separate piece of graphite foil and placed in a target boat. There are also 4 coated springs, 2 on each side of the stack of endcaps. The boat is wrapped with 3-layers of Ta heatshields. Chamber pumped down overnight. OMEGA slope = 0.98 HS water valves opened, no leaks detected. IGP1 = 5.9e-7 Torr IGP2 = 4.0e-7 Torr Tapping up manually. Final desired temperature = 1800C    Thursday, December 07, 2017, 11:51 TGHT tripped off. Turns out the vacuum limits have not been fully updated when they should have been and the old ones still apply. IGP1 reached 8e-5 Torr which tripped off the system. TGHT = 80A, 1.05V when the system tripped.    Friday, December 08, 2017, 15:29 Interlocks have been updated. TGHT should now run up to 500mTorr before tripping off.

Friday, December 08, 2017, 15:41

IGP1 = 2.8e-7 Torr

IGP2 = 1.9e-7 Torr

Tapped up manually to 50A

Initiated auto-ramp at a rate of 0.2A/min up to 300A.

Vacuum limit stop at 3.0e-5 Torr, backing off at 4.0e-5 Torr.

 Monday, December 11, 2017, 09:37

IGP1 = 2.4e-7

TGHT = 300A, 4.80V

OMEGA = 1175C

Tapping up manually...

 Monday, December 11, 2017, 14:19

Tapped up manually to 1800C

IGP1 = 2.1e-6 Torr

IGP2 = 2.1e-6 Torr

TGHT = 545A, 9.90V

OMEGA = 1810C

Will remain at max setpoints overnight and cool down in the a.m.

 Tuesday, December 12, 2017, 09:01

TGHT = 545A, 9.96V

OMEGA = 1833C

Remained at max setpoints for ~18hrs

IGP1 = 4.2e-7 Torr

IGP2 = 3.9e-7 Torr

Initiating auto-cool at 2.0A/min

 Wednesday, December 13, 2017, 11:05

Vented in air and removed from evap2 this morning.

Thursday, March 07, 2019, 09:09

Transfer tube from Legnaro was coated with TaC.

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

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

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

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

IGP1= 4.48e-07 Torr

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

 Thursday, March 07, 2019, 10:57

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

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

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

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

Good vacuum 3e-5 Torr

Bad vaccum 5e-5 Torr

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

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

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

The transfer tube stayed at 1800 C for 4 hours

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

Friday, March 08, 2019, 16:53 

EVAP2 was vented with air and the transfer tube was unloaded

Tuesday, June 04, 2019, 08:36

Each endcap is separated with a disc of graphite foil and rolled into packs of 5 within a foil envelope in a target boat.

There are also 4 coated springs, 2 on each side of the stack of endcaps.

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

Chamber pumped down overnight.

OMEGA slope = 0.99

IGP1 = 3.5e-7 Torr

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

Final desired temperature on OMEGA (tap)= 1800C

Tuesday, June 04, 2019, 11:54

IGP1= 6.1e-06 Torr

TGHT= 40 A

Begin autoramp to 400A at 1A/min

Out-gassing cycles observed.  Reduced autoramp to 0.5A/min

Currently TGHT=65A, 0.60 V

Wednesday, June 05, 2019, 08:27

TGHT = 321A, 4.9V @1149C

IGP1= 8.49 e-6 Torr

Set autoramp to 1A/min to530 A

Wednesday, June 05, 2019, 13:26

TGHT 530A, 9.2V

IGP1= 3.01e-05 Torr

OMEGA Temperature = 1689 Celsius

Set autoramp to 570A at 1A/min

 Wednesday, June 05, 2019, 15:51

Tapped manually to 1800 Celsius

TGHT 579A, 10.1V

IGP1= 2.06e-05 Torr

TGHT tapped down to 575A when OMEGA T ~1810 C

Thursday, June 06, 2019, 08:13

TGHT = 575A, 9.95V

OMEGA = 1809 C

IGP1 = 4.1e-7 Torr

Initiating auto-cool at -2.0A/min

Thursday, June 06, 2019, 16:00

After 1 hour  of TGHT at 0A and 0V, unloaded the Target boat.

 Wednesday, July 17, 2019, 10:57

Annealing of five RRR Nb samples following cold-working and resistance measurements.  Used to validate computational annealing model developed for SRF studies.  For more information contact Norman Muller, x6398.

Desired temperature 1025 C.

Five Nb samples wrapped with Nb foil were set on a tantalum boat (coated with TaC)

the tantalum boat was wrapped with two tantalum sheets.

The boat was installed in the EVAP2.

The initial vacuum was IGP1 = 1.26e-6 Torr.

Ramping rate 5 A/min to final current of 200 A.

Wednesday, July 17, 2019, 11:18 

At 155 A, the ramping rate was changed to 1 A/min 

Wednesday, July 17, 2019, 11:28 

The ramping was stopped at 167 A.

 Wednesday, July 17, 2019, 11:57

Conditions:

IGP1 = 1.65e-6 Torr

TGHT = 2.54 V, 174.46 A

Temperature ~ 950 C

Wednesday, July 17, 2019, 18:07

IGP1 = 1.16 e-6

TGHT = 3.18 V, 206.7 A

Temperature ~950 C

Cooling ramp 10 A/min 

 Vented with air

Suggestion for future annealing:

  Use tantalum boat without TaC coating.

 HS# 42752-7

Thursday, September 26, 2019, 13:46: Remove Flexible lines HS

Thursday, September 26, 2019, 14:03: Assy installed.

Friday, September 27, 2019, 07:07: Vacuum @ 1.16e-06T. 

Friday, September 27, 2019, 07:09: Waterlines opened. Vacuum stable @ 1.15e-06T 

Monday, September 30, 2019, 10:04: Remove Nb target & assy. Install flexible line HS. 

Wednesday, September 25, 2019, 18:06

Target boat with a layer of niobium foil on the bottom is used to heat up Nb samples to 1400 C for 4 hrs.

The niobium samples are wrapped in a Nb foil.

Boat is wrapped with 2 layers of Ta foil, careful to avoid touching samples.

Thursday, September 26, 2019, 18:10 

The target assembly was exchange to a clean one e-log 459 and the Nb arrangement was loaded into evap2.

Friday, September 27, 2019, 18:13

HS water valves opened, no leaks detected.

Tapped up manually to 40 A.

IGP1 = 9.54e-7 Torr

Setting auto-ramp rate at 0.2 A/min to max setpoint of 100 A.

Vacuum stable.

Setting auto-ramp at 1 A/min to 300 A lead to ~1200 C.

Autoramping at 1 A/min to 400 A will stop at 1400 C.

Temperature reading is 1400 C at:

TGHT = 5.61 V, 345.656 A

The temperature reading went to 1408 C on Omega and 1417 C on Micron so the current was dropped to 342.537 A and 5.56 V

The temperature went to 1418 C on Omega and the current was dropped to 339.281 A

After 4 hours at 1400 C, the Nb was cooled down

The final pressure was 3.07e-7 Torr 

The EVAP2 was vented with air and the Nb was removed. 

Friday, October 04, 2019, 11:37

Each endcap is separated with a disc of graphite foil and rolled into packs of 5 within a foil envelope in a target boat.

There are also 3 coated springs, one in between endcaps and two on either end

The boat is wrapped with 2-layers of Ta heatshields.

Chamber pumping down

OMEGA slope = 0.99

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

Final desired temperature on OMEGA (tap)= 1800C

Monday, October 07, 2019, 09:08

Sunday night heating started at 1A/ min on TGHT to 54 A

heating paused for 1 hour to allow IGP1 to equillibrate.  Then restarted at 1A/min to 400A as planned. 

This morning IGP1 = 1.3e-06 Torr

TGHT = 401A, 4.2V

OMEGA = 1550 C

Monday, October 07, 2019, 09:36

manually tapping to 1800 C

Monday, October 07, 2019, 14:09

Temperature @ ~1800 for 3.5 hours

TGHT= 495.4, 9.2 V

IGP1= 1.1e-06 Torr Pressure Steady there begin cooling

Cooling @ -2A/min

Monday, November 04, 2019, 14:19 

Each endcap is separated with a disc of graphite foil and rolled into packs one pack of 4 and one pack of 8 within a foil envelope in a target boat.

There are also 3 coated springs interspersed.

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

Chamber pumped down overnight.

OMEGA slope = 0.99

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

Final desired temperature on OMEGA (tap)= 1800C

 Tuesday, November 05, 2019, 11:30

IGP1 = 9.6e-7 Torr

Autoramp TGHT to 40A at 1A/min

Tuesday, November 05, 2019, 11:44

IGP1= 2.6e-06 Torr

TGHT = 40.8 A, 0.37V

Will leave at 40 A for 1 hour

 Tuesday, November 05, 2019, 12:39

 IGP1=2.5e-6 Torr

TGHT =40.0A, .33V

Start ramping TGHT to 400A at 0.1A/min

Wednesday, November 06, 2019, 09:32

IGP1=7.8e-7 Torr

TGHT = 168.4A, 2.38V

increase ramp speed to 1A/min

 Wednesday, November 06, 2019, 14:07

IGP1= 2.34e-6 Torr

TGHT=400.0 A, 6.98V

set TGHT autoramp to 460A @ 1A/min aiming for 1850C (see attached plot)

Wednesday, November 06, 2019, 15:18

OMEGA = 1776 C

TGHT = 460.0A, 8.52V

IGP1= 4.7e-6 Torr

Starting manual tap up to 1810C

Wednesday, November 06, 2019, 15:36

OMEGA=1810 C

TGHT = 468.8A, 8.74V

IGP1=4.14e-6

Wednesday, November 06, 2019, 19:04

OMEGA=1822 C (has been between 1817-1824 C over 3.5 hours )

TGHT=468.8A, 8.67V

IGP1=1.9498e-06 Torr

Start TGHT ramp down at -2A/min

Thursday, November 07, 2019, 09:55

THGT = 0A, 0V overnight

IGP1= 3.2 e-07 Torr

Proceeding with unloading.

End caps looked good for online use.

 Monday, March 16, 2020, 13:47

Target material characteristics: Graphite cast of 0.965g/cm3, 287 D-shaped discs, disc area 0.969cm2, total mass of 9.972g, length 10.657cm.

The target material is loaded in a graphite cartridge.

The graphite cartridge is placed in a tantalum boat previously coated with TaC,

the Ta boat was wrapped with two used Ta heat shields.

The system is currently pumping down.

 Tuesday, March 17, 2020, 08:11

IGP1 = 3.18e-7 Torr

Current will be increased manually to 10 A, and then it will be autoramp to 500 A

During the input of the 10 A there was no anomaly with the pressure and the autoramp was set to:

1 A each 10 s with a good vacuum of 3e-2 Torr and a bad vacuum 5e-2 Torr 

 Tuesday, March 17, 2020, 09:03

After 30 min:

TGHT: 98.1 A, 1.48 V (the voltage is increasing)

IGP1 = 3e-4 Torr

The autoramp is set to 2 A each 10 s to 500 A

Tuesday, March 17, 2020, 09:52

At 500 A the temperature was ~1243 C

So, the autoramp was re started  2 A each 10 s to 520 A

TGHT= 510 A, 9.18 V

IGP1= 8.2e-5 Torr

Pressure decreasing.

Temperature register in iR2C: 1272 C

The temperature stayed at 1270 C, 

The autoramp is re started: 2 A each 10 s to 600 A

Tuesday, March 17, 2020, 10:24

TGHT: 10.693 V, 588.5 A

IGP1 max 7.4e-5 Torr

Temperature after 3 min at 588.5 A: 1368 C

Tuesday, March 17, 2020, 10:34 

The autoramp is re started: 2 A each 10 s to 650 A

Tuesday, March 17, 2020, 10:46

TGHT=11.99 V, 637.6 A

IGP1=5.5e-5 Torr (8e-5 Torr max)

Temperature 1459 C

The current and voltage drop 10 A and 0.3 V respectively when the autoramp is stopped

Tuesday, March 17, 2020, 10:53

The autoramp is re started: 2 A each 10 s to 700A 

Tuesday, March 17, 2020, 11:04

TGHT: 13 V, 686.59 A

IGP1: 6.2e-5 Torr (Max 8.7e-5Torr) 

Temperature: 1507 C

Tuesday, March 17, 2020, 11:05

 The autoramp is re started: 2 A each 10 s to 800A 

Tuesday, March 17, 2020, 11:16

TGHT=14.29 V, 759 A

IGP1: 8.6e-5 Torr (Max 1e-4 Torr)

Temperature 1527 C

There is a current discrepancy in EPICs (see current discrepancy picture),

the autoramp stopped at 761 A because EPICS? reads 800 A

Increasing current manually. 

Increasing the current manually did not work, because set current is at fake maximum 

 Tuesday, March 17, 2020, 13:43

The temperature stabilized to 1567 C. The current however was not stable ( look at the CarbonTarget - Max current)

an autoramp is set to -2 A  each 10 s to 0A

The set current is going down but not the epics reading current neither the temperature. I assume the current will star going down when the set and the reading current from epics are the same.

Tuesday, March 17, 2020, 13:50

Autoramp was stopped, and current was reduced manually, at around 652 A (set current) the reading current started going down (639.5 A) 

Autoramp is set to -2 A each 10s to 0 A

The tantalum boat deformed and the graphite cartridge rim broke 

Friday, March 20, 2020, 19:39

The target material is loaded in a graphite cartridge.

The graphite cartridge is placed in a new tantalum boat previously without TaC,

the Ta boat was wrapped with three new Ta heat shields.

The system is currently pumping down. 

Monday, March 23, 2020, 07:49

IGP1 = 2.2e-7 Torr

Good vacuum= 3.00 e-5 Torr

Bad vacuum = 5.00 e-5 Torr

Ramping TGHT to 40A at 0.5A/min 

Monday, March 23, 2020, 10:35

Due to the COVID-19, non-essential activities are wrapped up,

the conditioning of the carbon target will be postponed until further notice 

Marla Cervantes wrote:

Friday, March 20, 2020, 19:39 The target material is loaded in a graphite cartridge. The graphite cartridge is placed in a new tantalum boat previously without TaC, the Ta boat was wrapped with three new Ta heat shields. The system is currently pumping down.  Monday, March 23, 2020, 07:49 IGP1 = 2.2e-7 Torr Good vacuum= 3.00 e-5 Torr Bad vacuum = 5.00 e-5 Torr Ramping TGHT to 40A at 0.5A/min  Monday, March 23, 2020, 10:35 Due to the COVID-19, non-essential activities are wrapped up, the conditioning of the carbon target will be postponed until further notice

 Wednesday, May 20, 2020, 12:50

On May 19 the pumps of EVAP2 were turned on to purge the system

Today Aaron made a leak check, for details, visit elog-481

Currently IGP1 = 8.17e-7 Torr

 Thursday, May 21, 2020, 09:41

IGP1 = 4.5e-7 Torr

TGHT = 0.03 V, 0.028 A

Current will be increased manually to 10 A, and then it will be autoramp to 500 A

Whit this power supply the current increments are register since the beging 

TGHT = 0.145 V, 10.35 A

During the input of the 10 A there was no anomaly with the pressure and the autoramp was set to 50A:

1 A each 10 s with a good vacuum of 3e-2 Torr and a bad vacuum 5e-2 Torr 

Thursday, May 21, 2020, 10:39

The autoramp reached the 50 A set

TGHT = 0.65 V, 49.05 A

Power supply = 0.64 V, 50 A

IGP1 = 4.7e-7 Torr

Everything looks good, autoramp is set to 80 A same conditions

1 A each 10 s with a good vacuum of 3e-2 Torr and a bad vacuum 5e-2 Torr 

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.

 2020-08-05 7.13pm Roughing pump on

2020-08-06 10:48am Turbo was turned on by Marla in the morning. Vacuum IGP1 4e-6Torr. Water leak check performed, everything good to start heating up target. Waiting for Anders confirmation to start.

2020-08-06 4:38pm after changing setup to metallic connections only. Roughing on. After some minutes abnormal behavior in vacuum.

Turning water off to see if it is a small water leak.

Water purged, no change in vacuum.

IEVAP2:RV1 was closed. After opening, normal vacuum behavior recovered. The valve is automatically closing when reaching 100Torr. Wasn't doing that before. Turbo on now.

2020-08-07 9:24am pumping over night, vacuum at 8e-7torr. Everything ready for test. Ramping up target heater.Up to 50A 1A/20s

2020-08-07 9:48am all good at 50A, ramping to 250 1A/10s

2020-08-07 10:27am all good at 250A, ramping to 400 1A/10s

2020-08-07 10:57am all good at 400A, ramping to 500 1A/10s

2020-08-07 11:17am Tc type C might have been deatached at 500A, ramping to 600 1A/10s

2020-08-07 11:37am All good, ramping to 700 1A/10s

2020-08-07 11:58am 1950degC on pyrometer, 1200degC on type C TC (probably not well attached anymore), TCs on heatshield [30-40]degC. Pressure 9e-6Torr

2020-08-07 12:44pm All values stable after 45min, starting to ramp up parasitic target heating elements.

2020-08-07 1:15pm Open circuit, would seem that one of the heating elements cracked. Cooling down the target.

The target was prepared and put under vacuum on 2020-08-10

2020-08-11 10:16am The pressure is 1e-6Torr. Leak checked performed, water on no problem. Starting to set target heating curve. 1A/10s up to 300A 

2020-08-11 11:23am target at 300A-1200degC Temperatures on exposed foil show to be higher than expected. 300degC already, 70degC on covered by foil thermocouple. Putting 50 more amps at 1A/10s 

2020-08-11 12:11pm target at 350A-1340degC. 350degC on exposed thermocouple. Ramping to 400A 1A/10s.

2020-08-11 12:28pm target at 400A-1420degC. 400degC on exposed thermocouple. Ramping to 450A 1A/10s.

 Short oven loaded with additional hardware are spacers into the flex-line HS.

A Ta short tube was wrapped with 3 tantalum foils,

a tantalum cap was inserted in both sides of the Ta tube, the caps weren't sealed.

The tube was set in the EVAP2 

Wednesday, August 12, 2020, 11:48: Electrical check in EVAP 2:

Target to HS @ 563V 

Leg to leg above bracket

TGHT A @ 10A: 1.332 mOhm

TGHT B @ 10A: 1.300 mOhm

Leg to leg w/ bracket

TGHT A @ 10A: 1.490 mOhm

TGHT B @ 10A: 1.491 mOhm

Wednesday, August 12, 2020, 12:08: Roughing.

Wednesday, August 12, 2020, 2:08: Turbo.

Thursday, August 13, 2020, 09:14

 IGP1 = 7.9e-7 Torr

A leak check was performed, no leak detected.

 TGHT power supply on.

Thursday, August 13, 2020, 10:03

IGP1 = 7.7e-7 Torr.

The current was tapped to 50 A 

Autoramp set to 1 A each 10 s to 200 A

Good vaccum 3e-5 Torr

Bad vacuum 5e-5 torr

Thursday, August 13, 2020, 10:47

Autoramp reached 200 A

TGHT =  200.25 A, 2.38 V

IGP1 = 1.58e-6 Torr

 Thursday, August 13, 2020, 11:07

TGHT =  200.25 A, 2.38 V

IGP1 = 9.66e-7 Torr

Target is shinning dimly

Omega reads 1033 +-50 degC

ARIEL pyrometer is installed in the back of the EVA2 to measured the body temperature of the oven

Thursday, August 13, 2020, 15:30

The connection of the pyrometer with the software was not possible to establish and delay the ramp up of the oven

Friday, August 14, 2020, 10:47

Restarting experiment, 

IGP1 =  4.24e-7 Torr

TGHT = 0 A, ) V, (TGHT was ramped down)

Autoramp set to 1 A each 10 s to 200 A

Good vaccum 3e-5 Torr

Bad vacuum 5e-5 torr

Friday, August 14, 2020, 11:48

Target is shinning dimly

Omega reads 1033 +-50 degC

Autoramp set to 1 A each 10 s to 250 A

Autoramp set to 5 A each 60 s to 450 A

Friday, August 14, 2020, 13:51

TGHT = 6.46 V, 450.13 A

IGP1 = 2.32e-6 Torr

Omega = 1931 °C (slope 0.99)

ARIEL pyrometer = 1504.5 °C (slope 0.929)

Friday, August 14, 2020, 14:06

Autoramp = 5A each 2 min until 500 

Autoranp stopped at 475 A (EPICS TGHT = 6.87V, 476.663A)

Omega = 2013 °C

ARIEL pyrometer = 1547 °C

Friday, August 14, 2020, 17:34

Autoramp is set to  5A each 2 min until 500 

TGHT = 7.403 V, 500.006 A, 

omega = 2104 C

AP= 1586 C

Friday, August 14, 2020, 17:49

Autoramp  is set to  5A each 2 min until 550 

Autoramp stopped by itself at 545 A instead of 550 A

TGHT = 8.11V, 547.65A, 

omega = 2214C

AP= 1656.8 C

IGP1=6.8e-6 Torr

Friday, August 14, 2020, 18:13

 Autoramp  is set to  10A each 2 min until 600

Friday, August 14, 2020, 21:42

TGHT = 9.213 V, 597.8 A,

IGP1 3.27e-6 Torr

Omega =  2380 °C

Ramping down at 5 A per min to 475 A

Monday, August 17, 2020, 09:02

TGHT =  6.741 V, 471.6 A,

IGP1 = 3.46e-7 Torr

Omega = 2052 6°C 

Proceeded to ramp down at  5 A per min to 0 A 

 Tuesday, August 18, 2020, 09:06

A short tantalum tube was coated with TaC and wrapped with 3 layers of Ta,

a Ta foil was attached to the end of the tube to be able to measure the temperature during heating

Desired temperature= 1900 C,

Omega Slope set = 0.990,

IGP1 = 3.75e-7 Torr

Autoramp set to TGHT at 0.2 A/min to reach 52 A

Tuesday, August 18, 2020, 13:47

IGP1=  6.8e-7 Torr

TGHT =0 .511 V, 51.3 A

IGP1 = 6.8e-7 Torr

Autoramp set to TGHT at 0.5 A/min to reach 100 A

IGP1 = 3.3e-7 Torr

Autoramp set to TGHT at 0.5 A/min to reach 430 A 

Wednesday, August 19, 2020, 06:57 

Autoramp stopped at 402 A

IGP1 = 1.12e-6 Torr

TGHT = 5.6 V, 403.65 A

Autoramp set to TGHT at 1 A/min to reach 500 A 

Wednesday, August 19, 2020, 08:59

IGp1 = 1.7e-6 Torr

 TGHT = 7.22 V, 500.34 A

After 30 min at 1900 °C, autoramp set to TGHT at -1 A/min to reach 450 A, the ramp will be stopped when the temperature reads 1850 °C

Autoramp stopped at 1845 °C

IGP1 = 1.17e-6 Torr

TGHT = 6.8 V, 472.95 A 

 Monday, September 21, 2020, 16:50

450 graphite foils coated with graphite slurry were loaded in a tantalum tube, the tantalum tube was wrapped with 3 Ta heat shields and installed in the EVAP, to measure the temperature, a pack of 4 Ta foils were inserted in each side of the tube.

System is currently pumping down. 

 Tuesday, September 22, 2020, 07:54

IGP1 = 2e-6 Torr

 Good vacuum of 3e-2 Torr and Bad vacuum 5e-2 Torr

The autoramp is set to 50 A at 1 A each 10 s 

Tuesday, September 22, 2020, 08:18 

IGP1 = 3.7e-6 Torr

TGHT = .586 V, 50.06 A

Autoramp is set to 80 A same conditions.

 Tuesday, September 22, 2020, 08:26

IGP1 = 0.0006 Torr

TGHT = .97 V 80.3 A

Autoramp is set to to 100 A at 1 A each 20 s

Tuesday, September 22, 2020, 08:45

IGP1 = 0.003 Torr 

TGHT = 1.3 V, 100.5 A

Autoramp is set to 120 A at same conditions 

Tuesday, September 22, 2020, 09:36

IGP1 = 0.0001 torr

TGHT = 1.6 v, 122 A

Autoramp is set to 200 A at 2 A each 10 s 

Tuesday, September 22, 2020, 10:19

IGP1 = 5.4e-5 Torr

TGHT = 2.9 V, 200.5 A

Omega = 1123 °C

AP = 1164 °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, September 22, 2020, 11:24

TGHT = 447.8 A, 7.4 V

IGP1 =  3.7e-5 Torr

Omega = 1750 °C

AP = 1720.4 °C

Autoramp set to 520 A at same conditions

 Tuesday, September 22, 2020, 11:38

TGHT = 8.9 V, 525.8 A

IGP1 = 4.8e-5 Torr

Omega = 1914 °C

AP = 1835.6 °C

Autoramp set to 560 A at same conditions

Tuesday, September 22, 2020, 12:13

Omega 2038 °C 

Tuesday, September 22, 2020, 12:14

Current manually reduced to 555 A 

TGHT = 9.8 V, 560.8 A

IGP1 = 2.5e-5 Torr

Tuesday, September 22, 2020, 12:17 

Omega = 2030 °C

Tuesday, September 22, 2020, 12:19 

Current manually reduced to 550 A 

TGHT = 9.8 V, 547.8 A

IGP1 = 2.3e-5 Torr

Tuesday, September 22, 2020, 12:27 

Omega = 2027 °C

Tuesday, September 22, 2020, 12:27

Current manually reduced to 540 A 

TGHT = 9.6 V, 541.6 A

IGP1 = 2e-5 Torr

Tuesday, September 22, 2020, 12:34

Voltage suddenly increased!

TGHT = 10.3 V, 533.8 A

IGP1 = 2.9e-5 Torr

Omega = 2129 °C

Current reduced manually to 520 A to compensate the voltage increment 

Tuesday, September 22, 2020, 12:52

Another voltage increment 

TGHT = 9.9 V, 519.75 A

IGP1 = 1.9 e-5 Torr

Omega 2108 °C

Current reduced manually to 500 A to compensate the voltage increment 

Omega = 2070 °C

Tuesday, September 22, 2020, 13:05 

TGHT = 9.4 V, 492.4 A

Omega = 2063 °C

Tuesday, September 22, 2020, 13:08

Another voltage increment! this time it was an spike 

Tuesday, September 22, 2020, 16:13

After 5 hours

IGP1 = 6e-6 Torr

TGHT = 9.5 V, 488 A

Autoramp was set to 0 A at 2 A/min 

Omega = 2044 °C

AP = 2003.7 °C

Wednesday, September 23, 2020, 16:18

EVAP2 vented with air, target removed. 

Sample loaded into a vertical target boat. Flex line HS removed, SS waterline HS installed -AS.

Thursday, September 24, 2020, 13:22: Roughing.

Thursday, September 24, 2020, 13:54: Turbo pump on. 

Friday, September 25, 2020, 10:30 

Target boat with a layer of niobium foil on the bottom is used to heat up Nb samples to 1400 C for 4 hrs.

OMEGA slope = 0.99

The niobium samples are wrapped in two layers of  Nb foil.

Boat is wrapped with 2 layers of Ta foil, careful to avoid touching samples.

Friday, September 25, 2020, 20:00 

autoramp to 345 A

 Friday, September 25, 2020, 20:39

TGHT = 345 A, 5.4 V

OMEGA = 1296 C

IPG1= 8.1 e-07 Torr

Ramp manually to 1400 C

 Friday, September 25, 2020, 20:51

reached 1400 C on OMEGA at TGHT = 476 A

Friday, September 25, 2020, 20:59

OMEGA increased to 1410, lowered TGHT to 468 A to get back to 1400 C on OMEGA 

Friday, September 25, 2020, 21:40

Lowered TGHT to 463 A,  5.79 V to bring OMEGA to 1400 C from 1404 C

 Saturday, September 26, 2020, 00:51

Sample has been at 1400 C for 4 hours.

IGP1= 7.2 e-07 Torr

Cooling at- 2A/min