Saturday, August 22, 2020, 11:41

A Ta short tube was coated with TaC and sintered, then it was loaded with a c-cartridge

Now is currently under vacuum and it will be heated to 2000 °C during 3 days

Saturday, August 22, 2020, 11:43

Good vacuum = 3e-2 Torr

Bad vacuum = 5e-2Torr

IGP1 = 3.08e-7 Torr 

Autoram set to 10A/30 s to 200 A

 Saturday, August 22, 2020, 11:59

Good vacuum = 3e-2 Torr

Bad vacuum = 5e-2Torr

TGHT = 2.36 V, 200.1 A

IGP1 =2.46e-6 Torr

Autoramp set to to 300 A at 5A/30s 

Saturday, August 22, 2020, 13:03

TGHT = 7.32 V, 495.3 A

IGP1 = 2.7e-6 Torr

Omega = 2016 °C

AP = 1970.1 °C

Autoramp set to 550 A at 5A/30s

 Saturday, August 22, 2020, 13:11

TGHT =7.6 V, 523.2 A

IGP1 = 3.2e-6 Torr

Omega = 2077 °C

Monday, August 24, 2020, 07:59

Voltage increased ~0.2 V while current remained the same indicating an increment in resistance, temperature increment increased accordingly

TGHT = 7.815 V, 520.87 A

Omega = 2126 °C

Monday, August 24, 2020, 08:04

The current was reduced 0.1 A to 519.9

Monday, August 24, 2020, 08:55 Omega =  2112 °C

Monday, August 24, 2020, 09:12

The temperature returned to Omega = 2130 °C

The current was reduced 0.1 A to 519.8

Monday, August 24, 2020, 09:56

TGHT = 7.7 V, 518.3 A

Omega = 2132 °C 

Monday, August 24, 2020, 09:59 

The current was reduced 0.2 A to 519.6 A

TGHT = 7.7 V, 517.3 A

Monday, August 24, 2020, 10:07  Omega = 2130°C

 Monday, August 24, 2020, 10:08

The current was reduced 0.4 A to 519.2 A

TGHT = 7.7 V, 513.5 A

Monday, August 24, 2020, 10:13  Omega = 2129°C

Monday, August 24, 2020, 10:21

Voltage dropped to 7.6 V and temperature reduced to 2105 °C

Monday, August 24, 2020, 10:30

Voltage increased to 7.8 V and temperature increased to 2128 °C

Monday, August 24, 2020, 10:33

The current was reduced 0.4 A to 518.6 A

TGHT = 7.7 V, 513.06 A

Monday, August 24, 2020, 10:38  Omega = 2130 ­°C

Monday, August 24, 2020, 10:41

 The current was reduced 0.4 A to 518.2 A

Monday, August 24, 2020, 11:13 

 The current was reduced 0.4 A to 517.8 A

Monday, August 24, 2020, 11:19  Omega = 2128 °C

Monday, August 24, 2020, 11:19 

 The current was reduced 0.4 A to 517.4 A

Monday, August 24, 2020, 11:22  Omega = 2126

Monday, August 24, 2020, 11:22

 The current was reduced 0.4 A to 517.0 A

Monday, August 24, 2020, 11:25  Omega = 2123 °C

Monday, August 24, 2020, 11:26

 The current was reduced 0.4 A to 516.6 A 

Monday, August 24, 2020, 11:30  Omega = 2109 °C

Monday, August 24, 2020, 11:30 

 The current was reduced 0.4 A to 516.2 A

Monday, August 24, 2020, 11:36  Omega = 2100 °C

Monday, August 24, 2020, 11:37

  The current was reduced 0.4 A to 516.0 A

TGTH = 7.5 V, 512.9 A

Omega = 2095 °C

Monday, August 24, 2020, 14:17

Voltage dropped and later on increased 

TGHT = 7.7 V, 517.5 A

Omega = 2120 °C 

Monday, August 24, 2020, 14:18

 The current was reduced 0.4 A to 515.6 A

TGHT = 7.6 V, 509.4 A

Monday, August 24, 2020, 14:20  Omega = 2125 °C

Monday, August 24, 2020, 14:20

The current was reduced 0.4 A to 515.2 A

Monday, August 24, 2020, 14:22  Omega = 2122 °C

Monday, August 24, 2020, 14:22

 The current was reduced 0.4 A to 514.8 A

Monday, August 24, 2020, 14:29  Omega = 2116 °C

Monday, August 24, 2020, 15:27

The voltage dropped as well as the temperature

TGHT = 7.5 V, 512.5 A 

Monday, August 24, 2020, 15:28 Omega = 2095 °C

Monday, August 24, 2020, 22:06

TGHT = 7.6 V, 515.9 A 

Omega = 2105 °C

Tuesday, August 25, 2020, 09:07

TGHT = 7.6 V, 519.13 A

Omega = 2102 °C 

Tuesday, August 25, 2020, 13:02

TGHT = 7.6 V, 518.0 A

Omega = 2116 °C

IGP1 = 3e-7 Torr

Tuesday, August 25, 2020, 13:04 

Starting ramp down to 0 A at 5 A/min 

 Wednesday, August 26, 2020, 10:26

A Ta short tube was loaded with a C-cartridge

Currently, the tube is under vacuum and it will be heated to 2000 °C during 3 days.

IGP1 = 3.2e-7 Torr

 Wednesday, August 26, 2020, 16:15

IGP1 = 2.5e-7 Torr

Good vacuum = 3e-2 Torr

Bad vacuum = 5e-2Torr

Autoram set to 200A at 10A/30 s

Wednesday, August 26, 2020, 17:05

TGHT = 3.9 V, 301.3 A

IGP1 = 5.4e-7 torr 

Omega = 1378 °C

AP (slope 0.9) = 1441.8 °C

Wednesday, August 26, 2020, 17:20 

Autoramp set to 550 A at 5A/30s

Wednesday, August 26, 2020, 23:43 

TGHT = 7.561 V, 504.9 A

Omega = 2124 °C

AP = 2010.5 °C

Thursday, August 27, 2020, 07:15

TGHT =  7.461 V, 510.2 A

Omega = 2103 °C

 Thursday, August 27, 2020, 13:41

TGHT = 7.5 V, 510.8 A

Omega = 2099 °C

Friday, August 28, 2020, 09:24

TGHT = 7.4 V, 513.9 A 

Omega = 2103 °C

Friday, August 28, 2020, 13:12

TGHT = 7.46 V, 505.6 A

IGP1 = 2.7e-7 Torr

Omega = 2103 °C

Saturday, August 29, 2020, 14:18

IGP1 = 2.5e-7 Torr

TGHT = 7.5 V, 510.8 A

Omega = 2109 °C 

Saturday, August 29, 2020, 17:44

IGP1 = 2.4e-7 Torr

TGHT = 7.5 V, 505.2 A

Omega = 2119 °C 

Saturday, August 29, 2020, 17:51 

Starting ramp down to 0 A at 5 A/min

 Sunday, August 30, 2020, 06:47

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

a Ta cap was inserted to the end of the tube to be able to measure the temperature during heating

Desired temperature= 1900 C,

Omega Slope set = 0.990

Sunday, August 30, 2020, 06:48

IGP1 = 3.9e-7 Torr

Autoramp set to 0.5A/min to 400 A 

Sunday, August 30, 2020, 18:27

IGP1 8.41e-7 Torr

TGHT = 4.2 V, 327.15 A

Omega  = 1367 °C 

Sunday, August 30, 2020, 18:49

IGP1 = 9.6e-7 Torr

TGHT = 4.4 V, 337.1 a

Omega = 1402 °C 

Sunday, August 30, 2020, 19:25

IGP1 = 9.5e-7 Torr

TGHT = 4.6 A, 347.5 A

Omega = 1472 °C 

Autoramp set to 450 A at 0.1A/30s

Sunday, August 30, 2020, 19:59

IGP1 = 8.5e-7 Torr

TGHT = 4.8 V, 360.5 A

Omega = 1510 °C

 Sunday, August 30, 2020, 22:07

IGP1 = 7.2e-7 Torr

TGHT = 5.3 V, 392.6 A

Omega = 1675 °C 

 Sunday, August 30, 2020, 22:16

IGP1 = 7.1e-7 Torr

TGHT = 5.5 V, 403.2 A

Omega = 1678 °C

Autoramp set to 450 at 0.1A/min

 Sunday, August 30, 2020, 22:26

IGP1 = 6.9e-7 Torr

TGHT = 5.5 V, 399.15 A

Omega = 1689 °C

Monday, August 31, 2020, 08:08

IGP1 = 4.4e-7 Torr

TGHT = 6.4 V, 453.4

Omega =  1852 °C

Monday, August 31, 2020, 08:12 

Autorap set to 0 A at -5 A/min

 Monday, August 31, 2020, 12:23

A short naked Ta tube (no heat shielding), previously coated with TaC was set under vacuum, 

and it will be kept at 2000 °C for 3 days to later identify the TaC's carbon penetration.

Currently pumping down.

 Tuesday, September 01, 2020, 12:25

IGP1 = 2.0-7 Torr

Good vacuum = 3e-2 Torr

Bad vacuum = 5e-2Torr

Autoram set to 200A at 10A/30 s

Tuesday, September 01, 2020, 12:36

IGP1 = 5.2e-7 Torr

Autoramp set to 300 A at 5 A/30 s 

Tuesday, September 01, 2020, 14:11

IGP1 = 3.4e-7 Torr 

TGHT = 330.2 A, 4.2 V

Omega = 1234 °C

Tuesday, September 01, 2020, 14:31

IGP1 = 1.76e-6 torr

TGHT = 6.94 V, 510 A

Oemga = 1564 C, 

AP = 1390.2 C

Autoramp set to 600 A at 5 A/30s 

Tuesday, September 01, 2020, 15:33

TGHT power supply = 600 A, 8.74 V

Omega = 1807 C

Autoramp set to 700 A at same rate

 Tuesday, September 01, 2020, 15:33

TGHT power supply = 11.94 V, 765 A

Omega = 2157 °C

Wednesday, September 02, 2020, 10:15 

IGP1 = 1.0e-6 Torr

TGHT = 12.0 V, 772 A

Omega = 2167 °C

Wednesday, September 02, 2020, 13:26

IGP1  = 9.1e-7 Torr

TGHT = 12 V, 769.5 A

Omega = 2166 °C 

Wednesday, September 02, 2020, 16:06

IGP1 = 8e-7 Torr

TGHT = 12 V, 773.3 A

Omega = 2167 °C 

Wednesday, September 02, 2020, 20:53

IGP1 =7.4e-7 Torr

TGHT = 11.8 V, 760.95 A

Omega = 2164 °C 

Thursday, September 03, 2020, 09:54

IGP1 = 5.5e-7 Torr

TGHT = 11.9 V, 774 A

Omega = 2162 °C 

Thursday, September 03, 2020, 11:06

IGP1 = 5.3e-7 Torr

TGHT  = 11.9 V, 758.7A

Omega = 2161 °C

Thursday, September 03, 2020, 14:39

IGP1 = 4.8e-7 Torr 

TGHT = 11.9 V, 771.8 A

Omega = 2164 °C

Friday, September 04, 2020, 09:34

IGP1 = 3.9e-7 Torr

TGHT = 11.9 V, 760.1 A

Omega = 2168 °C 

Friday, September 04, 2020, 13:39

 IGP1 = 3.5e-7 Torr

TGHT = 11.9 V, 758.6 A

Omega = 2170 °C

 Friday, September 04, 2020, 15:55

IGP1 = 3.5e-7 Torr

TGHT = 12 v, 760.6 a

Omega = 2171 °C

Saturday, September 05, 2020, 12:56

A Ta 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 

IGP1 = 3.6e-7 Torr 

Saturday, September 05, 2020, 12:57

Autoram set to 10A/30 s to 200 A

 Saturday, September 05, 2020, 13:11

TGHT = 2.7 V, 198.9 A

IGP1 =3e-6 Torr

Autoramp set to to 300 A at 5A/30s 

 Saturday, September 05, 2020, 14:45

IGP1 = 5.1e-7 torr

TGHT = 4.5 V, 303 A

Oemga = 1259 C, 

AP = 1233.5 C

Autoramp set to 450A at 5 A/30s 

 Saturday, September 05, 2020, 15:05

TGHT = 7.3 V, 457.7 A

IGP1 = 2.8e-6 Torr

Omega = 1722 °C

AP = 1572.2 °C

Saturday, September 05, 2020, 15:16 

TGHT = 9.2 V, 552.5 A

IGP1 = 7.5e-6 Torr

Omega = 2016 °C 

AP= 1735.9 °C

Saturday, September 05, 2020, 21:33 

IGP1 = 1.1e-6 Torr

TGHT = 11.2 V, 651.9 A

Omega = 2300 °C

 Wednesday, October 07, 2020

TP1 was not spinning up past 4krpm. Stalling & tripping out. Examined with Vacuum group, appears to be starting to seize. Exchange turbo pump.

Serial# 500937

Wednesday, October 07, 2020, 12:25: TP1 Exchanged. 

Wednesday, October 07, 2020, 12:38: Roughing. 

Wednesday, October 07, 2020, 13:55: Soft start initiated. Steps up krpm every 5 min. 10 steps.

Wednesday, October 07, 2020, 13:22 @ 24 krpm.  

Wednesday, October 07, 2020, 13:42: TP1 at speed. 38 krpm. 

Wednesday, October 07, 2020, 13:45: TP1 off. Soft start function off. Remote start configuration initiated. TP1 on. OK. 

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. 

Monday, February 08, 2021, 17:00: Installed brackets w/ Ta wire and a small piece of Re to test voltage drop.

Rough down, TP on. Waterlines open.

Tuesday, February 09, 2021, 06:44: Vacuum @ 8.63e-07T.

Tuesday, February 09, 2021, 06:45: Shut TP & roughing pump ff. Valves are close. Ready for power outage.

Tuesday, February 09, 2021, 11:30: BP1 & TP1 back on.

Tuesday, February 09, 2021, 11:37: PS on. Vacuum @ 9.7e-06T & continuing down.

micron slope 0.98

Tuesday, February 09, 2021, 16:01 Pressure 7.26e-7 Torr

aiming at a temperature of 2000 degC on the wire; wire is not in the visual range of pycnometer; simulations of the system indicate that wire will be at 2000 degC at 60 W, hence current will be increased slowly.

Rate: 0.1 A/60 s to 10 A

Tuesday, February 09, 2021, 16:47 Tendence showed that at 5 A the power will be ~10 W, final ramping step was updated accordingly.

Tuesday, February 09, 2021, 16:49 Pressure dropping a bit: Current reading 7e-7 Torr

Tuesday, February 09, 2021, 17:09Pressure going down, curent will be ramped down at 0.2 A/min

Pressure: 6.958e-7 Torr, TGHT: 5 A, 2.748 V, omega is reading 1625 degC somewhere somehow, wire will stay at this conditions for 10 min to see  if there is a pressure or voltage change.

Tuesday, February 09, 2021, 17:16 voltage and temperature are slowly increasing  2.789 V, and 1688 degC respectively.

Tuesday, February 09, 2021, 17:32 Voltage signal is noisy but it seems like the voltage is not increasing anymore, preassure has remained constant, wire is glowing, 1100 degC with manual pyrometer.

Tuesday, February 09, 2021, 17:44 TGHT: 2.81 V, 4.95 A, IGP1 6.63e-7 Torr. current will be increased manually at 0.2 A steps. At first step voltage is stable.

Tuesday, February 09, 2021, 18:13 TGHT: 6.6A, 3.981V (~26W), Omega 1741 degC and manual pyrometer ~1300 degC

Tuesday, February 09, 2021, 18:28 TGHT: 8A, 5.121V (~40W), omega 1816 degc, 1390 degC with manual pyrometer, step changed to 0.4A.

Tuesday, February 09, 2021, 18:34 TGHT: 8.8A, 5.88V (50W), omega 2008 degC, 1500 manual pyrometer

Tuesday, February 09, 2021, 18:56  TGHT: 9.6A, 6.64V, manual pyrometer 1800 degC, omega 2042 degC, wire is shinny enough for micron 2092 degC.

Tuesday, February 09, 2021, 19:01TGHT: 10A, 7V, ~1800 degC manual pyrometer, omega 2123 degC, micron 2152 degC

Tuesday, February 09, 2021, 19:15 TGHT: 10.5A, 7.47V, 2150 degC Omega, 2165 degC, ~1800 degC manual

Tuesday, February 09, 2021, 19:23 TGHT: 11A, 7.93 V, 2188 omega, 2210 deC micron

 Tuesday, February 09, 2021, 19:29 TGHT: 11.5A, 8.37V, 2188 omega, 2210 deC micron

Tuesday, February 09, 2021, 19:33 TGHT: 12A, 9V, 2325 degC, 1900 degC manual, the wire changed shape and the preassure increase a bit , micron was readjusted to read, micron 2454 degC. Wire might be touching tube, only one more amper will be imputed.

Tuesday, February 09, 2021, 19:55 TGHT 13A, 9.865 V, 2404 degC omega , 2558 degC micron, manual pyrometer still reads 1800 degC, pressure increased with the power increment, bbut it seems like the wire touching the tube so no more current will be imputed.

Tuesday, February 09, 2021, 20:08 started ramping at -0.2A/min

Wednesday, February 10th , 20211, 10:00 System unloaded from EVAP2, wire has straightened, it has not sintered to the copper brackets, system is clean there is no evidence of coating.

Thursday, February 10, 2021, 12:00

Objective: Heat a Re wire to evaporate it and deposit a layer of Re on the inner surface of a Ta tube.

A Re wire of 1mm diameter was clamped with Cu brackets in EVAP2, the wire is partially enclosed in a Ta tube. EVAP2 pumping down 

The wire needs to be heated to 2500 degC since this is its sublimation temperature at 8e-7 Torr

There is not a reliable system to measure the temperature of the wire but the readings of the micron, manual, and omega pyrometers will be register.

According to COMSOL simulations a power and taking in consideration the EVAP2's power loss, a power of 520 W (5A, 10V) is required.

Thursday, February 11, 2021, 15:39

Pressure 3.78e-7 Torr, current rate set to 10 A @ 0.5 A/min

Thursday, February 11, 2021, 16:32

Pressure: 4.01e-7 Torr, TGHT = 10A, 1.719 V. The voltage has stabilized, the wire is glowing but not enough for reading with micron nor omega, manual reads 970 degC. Also, the wire formed an arc (crest).

Thursday, February 11, 2021, 16:44

 Pressure 3.8e-7 Torr, TGHT  = 10 A, 1.723 V ramp set to 20A @ 0.2 A/min

Thursday, February 11, 2021, 17:26  

Pressure increasing 4.7e-7 torr, TGHT = 20 A, 4.016 V, the wire does not seem to be changing, 

Thursday, February 11, 2021, 18:02

Ramp set to 30A @0.4A/min

Pressure  7.2e-7 Torr, TGHT = 30A, 6.561V, manual pyrometer reads 1720degC

Ramp set to 40A @0.4A/min

Thursday, February 11, 2021, 18:35

 Pressure 2.1e-6Torr and increasing, TGHT = 40A, 9.1V, manual pyrometer reads ~1880 degC

Ramp set to 50A @ 0.4 A/min

 Tuesday, February 23, 2021, 08:49

Yesterday a heat shield was washed and when dry it was installed in the EVAP2,

A 1mm thick rhenium wire was held within two copper brackets to pass through a Cu tube with the intention of coating its inside face

Tuesday, February 23, 2021, 08:58  IGP1 = 7.7e-7 Torr

Pressure 5.88e-7 Torr, current rate set to 10 A @ 0.5 A/min

Pressure 6.1e-7 Torr, current rate set to 20 A @ 0.5 A/min

Pressure 8.51e-7 Torr current rate set to 30 A @ 0.5 A/min, temperature corrected 1800 degC (measured with filament pyrometer)

After 10 min the current and voltage are stable and the pressure is going down

Tuesday, February 23, 2021, 16:25

It seems like the wire is touching the tube so the system will be cool down.

Pressure 6.8e-7 Torr current rate set to 0A at -0.1 A/min

 Tuesday, February 23, 2021, 17:38

Pressure 6e-7 Torr, TGHT = 23.3 A, 4.854 V, Temp 1788 deg C Omega, 1540 degC filament

current rate set to 0A at 0.2A/min 

Wednesday, February 24, 2021, 09:37

Venting EVAP2 

Wednesday, February 24, 2021, 16:47

The wire and Cu tube were  fix such that the wire's deformation does not lead it to touch the tube, then the assembly was attached again and the EVAP2 was pumped down.

IGP1 = 9.3e-7 Torr, current rate is set to 5 A at 0.5 A/min

Wednesday, February 24, 2021, 17:04

IGP1 = 9e-7 Torr TGHT = 5.175A, 0,749 V

current rate is set to 10 A at 0.5 A/min

Wednesday, February 24, 2021, 17:23

IGP1 = 8.8e-7 Torr, TGHT = 10A, 1.78V

current rate is set to 20 A at 0.5 A/min

Since the wire seemed to be touching the tube, the system was vented.

The tube was shifted and the heat shield installed again, the system was pumped over nigth.

Thursday, February 25, 2021, 09:15

A water leak was performed and no leak was observed

IGP1= 4.95e-7 Torr

Thursday, February 25, 2021, 09:32  The current is increased at 0.5 A/min to 5 A

Thursday, February 25, 2021, 10:00

The current was tapped manually at 0.5 A to 6 A the wire is now glowing dimmly

Current rate set to 10A at .5 A/min

Current rate set to 20 A at 0.5A/min

Current rate set to 30 A at 0.5A/min

Thursday, February 25, 2021, 11:17  IGP1= 5.7e-7 Torr, TGHT=30.5A, 6.718V, filament=1740 degC

voltage and current stable, pressure going down.

Thursday, February 25, 2021, 11:21

Current rate set to 40 A at 0.4 A/min

Thursday, February 25, 2021, 11:53 IGP1 = 5.9e-7 Torr, TGHT = 9.267V, 39.15A, filament = 2060 degC

voltage and current stable, pressure going down.

Current rate set to 50 A @ 0.2A/min

During ramping the voltage reduced a bit and I decided to stop the ramp and reduce the current, the voltage stayed constant but the current started increasing slowly without me inputting it so I decided to ramp down the current at 0.2A/min.

When the current reached 0A the power supplies and the pumps were turned off, after an ~1h when the turbo pump had already stopped, the EVAP2 was vented and open.

The wire sintered to the copper tube confirming that the wire was in contact with the tube during heating.

The Cu tube present a grey metallic coloration indicating a Re coating.

The set up together with the copper heat shield were removed from the

 Tests were performed with external power supply. No target boat or container.

Small power on heating small heating elements on parasitic target attached on isac heatshield with water cooling 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. 

 Modified HS installed with new brackets as per Marla.

Tuesday, March 23, 2021, 08:02: Vacuum @ 3.64e-07T. Waterlines opened.

Tuesday, March 23, 2021, 08:06: Vacuum @ 3.60e-07T. Stable.

Objective: Coating the inner surface of a short tantalum boat with rhenium.

Result:

• The wire snnaped around 376 W (53 A, and 7.09 V) and 2170 °C (measured with filament pyrometer)
• The tube does not have indications of coating

Thursday, March 25, 2021, 11:23

Yesterday a heat shield was installed in the EVAP2.

The desired temperature of the Re wire is 2500 degC

A water leak was performed (elog 539 describes it), no leak was detected.

Tuesday, March 23, 2021, 11:01

Pressure 3.8e-7 Torr, current rate set to 6 A @ 0.5 A/min

The wire started glowing at TGHT =  4W, 7A, 0.56V

When reaching 7A the current was increased 0.5 A manually 

When reaching 16 A,  the current was increased 1 A manually until reaching 54 A when the wire snapped

Thursday, March 25, 2021, 07:55: Vacuum @ 5.12e-07T. Waterlines opened.

Thursday, March 25, 2021, 07:55: Vacuum @ 5.09e-07T. Stable.

Objective: Coating the inner surface of a short tantalum tube with rhenium.

Result:

• The wire snnaped around 376 W (53 A, and 7.09 V) and 2170 °C (measured with filament pyrometer)
• The tube is coated

Thursday, March 25, 2021, 11:23

Yesterday a heat shield was installed in the EVAP2.

The desired temperature of the Re wire is 2500 degC

A water leak was performed (elog 539 describes it), no leak was detected.

Tuesday, March 23, 2021, 11:01

Pressure 3.8e-7 Torr, current rate set to 6 A @ 0.5 A/min

The wire started glowing at TGHT =  4W, 7A, 0.56V

When reaching 7A the current was increased 0.5 A manually 

When reaching 16 A,  the current was increased 1 A manually until reaching 54 A when the wire snapped

Friday, March 26, 2021, 13:55

Yesterday a heat shield was installed in the EVAP2.

A 1mm thick rhenium wire was held within two copper brackets to pass through a Cu tube with the intention of coating its inside face.

The desired temperature of the Re wire is 2500 degC

A water leak was performed and no leak was detected

Objective: Coating the inner surface of a tantalum tube to make a destructive test and use a reference for the tantalum boats coatings

Results: 

Sunday, March 27, 2021, 11:23

No water leak

IGP1 = 3.7e-7 torr

Sunday, March 27, 2021, 16:10

The wire was heated in the same manner as the last three runs

From 0A to 7A the autoramp was set to 0.5A/min

At 8A the wire started the glow dimmly 

Above 8A, the wire was heated manually at 0.5A until 16A where the step was changed to 1A, 

the temperature was measured with the filament pyrometer every 2 A starting at 10A

At 42 A the step was changed to 0.6A until 42.6A, 4.38V (2020 °C), the wire was kept at that temperature for 90 min

After that time, the current was ramped down at 0.5A/min until ~20A when the current rampping was changed too 1A/min

Objective: Coating the inner surface of a tantalum tube to make a destructive test and use a reference for the tantalum boats coatings

Results: The tube was coated

Sunday, March 28, 2021, 11:23

No water leak

IGP1 = 2.3e-7 torr

Sunday, March 28, 2021, 16:10

The wire was heated in the same manner as the last three runs

From 0A to 7A the autoramp was set to 0.5A/min

At 8A the wire started the glow dimmly 

Above 8A, the wire was heated manually at 0.5A until 16A where the step was changed to 1A, 

the temperature was measured with the filament pyrometer every 2 A starting at 10A

At 42 A the step was changed to 0.6A until 42.6A, 4.38V (2020 °C), the wire was kept at that temperature for 90 min

After that time, the current was ramped down at 0.5A/min until ~20A when the current rampping was changed too 1A/min

 2021-03-30 7:48 Target loaded with parasitic target only. No container. Leaving under vacuum over night.

 2021-03-31 13:43 Leak check performed. Water on. Need to vent system, electric connection disconnected.

 2021-03-31 15:02 First test successfully finished. Venting to introduce container with radiating heating gun.

 2021-04-01 14:58 Vacuum 3.5E-7 torr. Leak check done. Ramping up target heater to 100A at 1A/10s

 2021-04-01 14:58 Vacuum 5E-7, 100A all ok. Temp foil 24.3DegC. ramping to 500A at 1A/10s.

 2021-04-01 14:58 Temp of foil not increasing much. Probably issue with TC. ramping down at 1A/10s to vent and inspect.

 2021-04-02 11:03 Target reinstalled, foil TC reinstalled. Vacuum 3E-7 torr. Leak check done. Ramping up container to 500A 1A/10s. 

 2021-04-02 13:07 Still isues with TC. Container ramped down at 1A/10s. Venting, brought heat gun to check TC.

 2021-04-02 15:10 TC connection fixed, origin of issues. Vacuum down to 3E-5 torr. Ramping up container to 200A 1A/10s.

 2021-04-02 18:32 TGTH 200A Tc temp 327.5degC. ramping up to 300A. 1A/10s.

 2021-04-02 18:32 TGTH 300A Tc temp 500degC. ramping up to 400A. 1A/10s.

 2021-04-02 19:17 TGTH 400A Tc temp 618degC. ramping down.

 2021-04-03 13:37 Foil was changed, ramped up to 200A at 1A/10s, Temp TC 360degC. Ramping to 300A. Vac 8.6E-6 torr.

 2021-04-03 13:59 300A Temp TC 580degC. Ramping to 500A, 1A/10s. Vac 7.6E-6 torr.

 2021-04-03 14:36 500A Temp TC 836degC. Ramping to 600A, 1A/10s. Vac 9E-6 torr.

 2021-04-03 14:36 600A Temp TC 960degC. Vac 1.1E-5 torr. Ramping down. 

2021-04-03 19:00 After venting an opening the evap2, it was found that remaining from a past heat treatment where on the Tantalum container. The sublimation of the material coated the inner walls of the evap.2. Now cleaned.