Tuesday, December 03, 2019, 08:15: Waterlines opened. Vacuum ok @ 4.06e-07T

Tuesday, December 03, 2019, 08:23: Unable to start due to flow trip? PS off. 

Tuesday, December 03, 2019, 08:25: Turbo & Vac off. 

Tuesday, December 03, 2019, 08:51: Vented. Investigate. Install outer shields. Loose wire found on exterior paddle. Trip gone. Roughing. 

Tuesday, December 03, 2019, 09:03: Turbo pump on. 

Tuesday, December 03, 2019, 09:12: PS on. Vacuum @ 4.46e-05T and dropping. 

Wednesday, December 04, 2019, 10:21: Manually tapped up the TGHT / TBHT to 35 / 10 A.

Wednesday, December 04, 2019, 10:22: Auto-ramping TGHT / TBHT to 300 / 150 A @ 2 A per min. 

FM

Wednesday, December 04, 2019, 13:48:  Auto-ramping TGHT / TBHT to 350 / 175 A @ 2 A per min. 

Wednesday, December 04, 2019, 14:20: Auto-ramping TGHT / TBHT to 400/ 190 A @ 2 A per min.  

Thursday, December 05, 2019, 10:58: Checking the striptool, approximately 30 minutes ago there was an oscillatory behaviour on the TGHT power. It went down to 0 in a very short time.

Temperature measurements were recorded and indicate a 70C difference from before the event.

 Thursday, December 05, 2019, 15:08: Auto-ramping TGHT / TBHT to 450/ 230A @ 2 A per min.  

Thursday, December 05, 2019, 19:05: Checking the striptool, at around 6 pm the TGHT power supply trip and didn't come back.

Thursday, December 05, 2019, 19:06: Drop in temperature indicates the target stop glowing.

Thursday, December 05, 2019, 19:07> Turning off power supply on EPICS and setting the slider to 0A.

I will ramp up TGHT in the morning while in the lab. 

Friday, December 06, 2019, 14:55: Ramping down TBHT to 0A @ 2A/min 

Tuesday, December 10, 2019, 09:11: Manually tapped up the TGHT / TBHT to 35 / 10 A 

Tuesday, December 10, 2019, 09:12:  Auto-ramping TGHT / TBHT to 400/ 230A @ 2 A per min.  

Aborted

Tuesday, November 26, 2019, 14:53

Total number of foils: 504

Total length packed 17.4 cm

container has 3 Ta heat shields.

No endcaps inserted to facilitate out-gassing

Two TaC coated Ta wire springs inserted at either end.

Initially to ramp TGHT and TBHT to 50A at 1A/min

Then heat manually to OMEGA ~1400 C , ramping TGHT manually and automatically  to reach 530A A (Omega slope set = 0.990)

Then temperature= (Correected to 1800C) 1900 C, Omega Slope set = 0.990, manually and automatically ramp to 700A, TGHT will be tapped up accordingly to reach desired Temp.

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

System experienced some vacuum issues due to cooling water leak in a heatshield line. 

Evaluation discs not included because no space.

Total Green disc mass measured = 58.250 g

Tuesday, November 26, 2019, 15:00

IGP1= 7.4e-06 Torr.  No leak issues found after last fix (Anders will add details).

Tuesday, November 26, 2019, 15:33

TGHT= 52.7A, .22V   TBHT= 49.3A, .52V

IGP1= 7.202 e-06 Torr (trending up so will allow to stabilize).

Wednesday, November 27, 2019, 06:09

left with autoramp waiting for vac to drop but no advance overnight.

Pressure did not seem to drop back below 3e-5 Torr magnitude, therefore not much advance in current ramp.

Thursday, November 28, 2019, 11:15

Continued ramping manually 

OMEGA = 1429 C  (0.99 slope), TGHT = 542A, 7.8V

With slope = 1.08 OMEGA = 1724 C, therefore staying at 0.99 slope

TaC coating sintering  plot suggests 753A to reach 1800C (See attachment 1)

Windows a little bit coated but not enough to disturb laser. 

Thursday, November 28, 2019, 12:17

TGHT =753A, 11.8V since 12:00 noon. 

TBHT= 233.4A, 3.3V

OMEGA= 1735 C (0.99 slope)

 Thursday, November 28, 2019, 13:01

OMEGA = 1860C (1.08 slope)

 Thursday, November 28, 2019, 14:38

OMEGA temperature began to creep up to ~1880.  Tapped TGHT current down to 733.5A, 11.4V

Thursday, November 28, 2019, 15:12

Checked windows and no significant additional buildup of obstructive material.

Temperature creeping up again.  Tap down TGHT current to 729 A, 11.2 V

OMEGA = 1870C at slope 1.08

 Thursday, November 28, 2019, 16:03

Temperature increase to 1880C

Tap down TGHT current to 715A, 10.9V

OMEGA= 1870 C (slope = 1.08)

Thursday, November 28, 2019, 16:22

Temperature creep to 1880 C

Tap down TGHT to 700A, 10.8V

OMEGA= 1845C

IGP1=2.2e-06 Torr

Thursday, November 28, 2019, 16:37

IGP1= 1.9e-06 Torr

OMEGA = 1850C (1.08 slope)

TGHT = 692A, 10.5V  TBHT= 233A, 3.2V

Initiating pressure ramp at -2A/min on TGHT and -1A/min on TBHT

Thursday, November 28, 2019, 16:45

IGP1= 1.28e-06 Torr

OMEGA= 1770 C (1.08 slope)

TGHT = 650A, 9.8V

ramp TGHT at -3.5A/min maintain TBHT at -1A/m in

 Thursday, November 28, 2019, 17:11

IGP1= 1.14e-06 Torr

OMEGA = 1730 C (1.08 slope)

ramp TGHT at -5A/min maintain TBHT at -1A/m

Thursday, November 28, 2019, 17:20

IGP1- 8.9e-07 Torr

OMEGA=1636C

ramp TGHT at -6A/min maintain TBHT at -1A/min

 Thursday, November 28, 2019, 17:34

IGP1= 7e-07 Torr

OMEGA= 1500 C (1.08 slope)

ramp TGHT at -8A/min maintain TBHT at -1A/min

TBHT = 183A

 OMEGA 1180C

TGHT =300 A

TBHT = 155A

Initiated -15A/min TGHT and -4A/min TBHT

IGP1= 5.2e-07 Torr

OMEGA below 1000C

begin manual tapdown

Thursday, November 28, 2019, 19:42

Target was dismounted after cooling.  Two graphite discs and end caps inserted.

Darwin Ortiz Rosales wrote:

Tuesday, November 26, 2019, 14:53 Total number of foils: 504 Total length packed 17.4 cm container has 3 Ta heat shields. No endcaps inserted to facilitate out-gassing Two TaC coated Ta wire springs inserted at either end. Initially to ramp TGHT and TBHT to 50A at 1A/min Then heat manually to OMEGA ~1400 C , ramping TGHT manually and automatically  to reach 530A A (Omega slope set = 0.990) Then temperature= 1900 C (Correction = 1800 C, NOT 1900 - JW), Omega Slope set = 0.990 (use 1.08, check temp, JW), manually and automatically ramp to 700A (check temp to see if it's matching with the 1.08 slope), TGHT will be tapped up accordingly to reach desired Temp. 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 System experienced some vacuum issues due to cooling water leak in a heatshield line.  Evaluation discs not included because no space. Total Green disc mass measured = 58.250 g   Tuesday, November 26, 2019, 15:00 IGP1= 7.4e-06 Torr.  No leak issues found after last fix (Anders will add details). Tuesday, November 26, 2019, 15:33 TGHT= 52.7A, .22V   TBHT= 49.3A, .52V IGP1= 7.202 e-06 Torr (trending up so will allow to stabilize).

 Wednesday, November 27, 2019, 17:44

I'll take over from here to step up the target heater, and I'll coordinate it with Darwin. 

 Wednesday, November 27, 2019, 20:36

Note: Sintering temp should be at 1800 C, NOT 1900.  Use Omega slope 1.08 and check temperature.  Correction made on elog #471.

Continue to step up TGHT and TBHT, keeping vacuum below 1.5 e-5 Torr. 

 Thursday, November 28, 2019, 03:06

TGHT reached to 400A/5.29V, TBHT at 230A/3.13V. 

Vacuum coming down from 1.3 e-5 Torr.

OMEGA = 1105 C (slope at 0.99).

Instructions for Darwin:

1.  Confirm temperature - check the temp plot from the TaC coating step. 

2.  Change OMEGA slop to 1.08 - check to see if this matches the temp plot.  If not, bring it back to 0.99.

3.  Continue to step up TGHT, check temp at 1400C (change slop 1.08 and check), 1500 C, 1600 C (check windows for coating - if any coating, then OMEGA is no longer useful hereon)

4.  Use the temp plot and continue to tap up TGHT to reach 1800 C and hold it for at least 4 hours or until the vacuum goes below 1 e-6 Torr then proceed with cooling down.

5.  Use the auto cooling program for TGHT (-2A/min) and TBHT (-1A/min)

Note:  For ramping up TGHT, keep vacuum below 1.5 e-4 Torr and keep tapping up to reach 1800 C.  Above 1100 C, this should be a quick step to get to 1800 C; should take < 2 hrs to get there.  

See the striptool or the attachment below to see how I did it. 

Once the chamber is cool down, take out a few samples for SEM analysis. 

Good luck!

This morning, the vacuum responded to shutting of the water of the heat shield circuit (leak rate without pumping leveling out). The vacuum chamber was vented and the heat shield with flexible lines was replaced with another heat shield with fixed lines. The chamber was again pumped down and water opened at ~150 mTorr to test the leak up rate without pumping. No leaks apparent, so continued pumping down with turbo pump. At a vacuum of about 1E-6 Torr the water was again supplied to the heat shield circuit and an increase in vacuum could be observed. Stopped the turbo pump and prepared to vent. Two new heat shield lines were brazed in the machine shop and fitted by Maico after lunch. During this time one of the old lines (from heat shield to feedthrough in box) was leak tested and a leak found at a location just above the VCR. The line had been twisted and due to the twist developed a leak. With the two lines replaced, the vacuum was pumped down again and water could be supplied without any increase in vacuum pressure at 1E-6 Torr. To facilitate the new copper tubing, the restraining bracket for the heat shield VCRs was not mounted. It will have to be fitted later. Until then, please contact Anders for help in removing the heat shield to prevent any damage to the new lines.

 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. 

12.3

Saturday, November 23, 2019, 14:00

Container coated with TaC and wrapped with 3 Ta heat shields.

Desired temperature= 1900 C, Omega Slope set = 0.990, Auto TGHT at 0.2A/min to reach 400A, TGHT will be tapped up accordingly to reach desired Temp.

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

Good vac at 3.00e -5 Torr

Bad vac at 5.00e-5 Torr

Chamber pump down was started on Friday November 22; however.

No leaks were observed when turning water lines on.

IGP1= 4.6e-07 Torr

 Saturday, November 23, 2019, 15:30

autoramp at 0.5A /min up to 50A for both TGHT and TBHT and maintained for 1 hour.

Saturday, November 23, 2019, 16:15

IGP1= 1.1e-06 Torr

Auto Ramp to 450 A on THGT and 230A on TBHT at 0.5A/min

Saturday, November 23, 2019, 23:44

IGP1= 5.2e-06 Torr

TGHT = 248A, 2.9V  TBHT= 233A 2.9V

Increased ramp step to 1A/min to 620 A

Sunday, November 24, 2019, 00:14

IGP1=1.9e-06 Torr

TGHT = 274.3, 3.3V   TBHT= 233A, 2.9V

Sunday, November 24, 2019, 07:33

IGP1=3.2e-06 Torr

OMEGA= 1490C

TGHT = 619 A, 9.1V   TBHT=233A, 2.9V

Continue ramping THGT at 1A/min to 700 A

Sunday, November 24, 2019, 10:05

IGP1= 2.1 e-05 Torr

OMEGA= 1676 C

TGHT= 700A, 10.6V   TBHT= 233A, 2.0V

Start autoramp to 780A as per regression in attachment

Sunday, November 24, 2019, 13:22

Autoramp to 795A  for TGHT

Sunday, November 24, 2019, 21:16

OMEGA= 1854 C

TGHT= 789.6A, 12.27V  TBHT= 233.A, 2.9V

IGP1= 2.0e-05

Will allow pressure to stabilize lower.

Sunday, November 24, 2019, 22:16

TGHTT= 789.6A, 12.3V TBHT=233.3A, 2.9V

OMEGA=1855C

IGP1 = 6.9e-06Torr

Start cooling TGHT at 2A/min and TBHT at 1A/min

 Friday, November 22, 2019, 18:18:

Friday, November 22, 2019, 18:18: Roughing

Friday, November 22, 2019, 18:23: Turbo on .

Friday, November 22, 2019, 18:32: Turbo at speed 

 Thursday, November 21, 2019, 08:09: PS on. Leak issue resolved (Evap 2 Elog 466). Vacuum @ 4.10e-07T.

Thursday, November 21, 2019, 08:15: Auto-ramping TGHT / TBHT @ 2 A per min to 300 / 150 A. 

 HS 42752-5 - Setup for Temperature mapping.

Friday, November 15, 2019, 13:26: Roughing. 

Friday, November 15, 2019, 13:36: Turbo pump on. 

Monday, November 18, 2019, 07:46: Waterlines opened. Vacuum ok @ 3.56e-07T.

Monday, November 18, 2019, 07:48: PS on.

Monday, November 18, 2019, 09:21: PS off. Vacuum slowly spiked to 1.23e-06T. Indicative of a small water leak. 

Monday, November 18, 2019, 09:24: HS waterlines purged. vacuum dropped to 5.54e-07T. 

Monday, November 18, 2019, 09:27: Valves closed. TP off. BP off.

Monday, November 18, 2019, 10:27: Venting.

Monday, November 18, 2019, 11:06: Gaskets checked / replaced. Roughing. 

Monday, November 18, 2019, 11:14: turbo pump on. 

Monday, November 18, 2019, 14:19: Waterlines opened. 

Monday, November 18, 2019, 14:23: Response on vacuum. Leak is still present & a higher rate (Has an immediate response). Turbos off. 

Monday, November 18, 2019, 14:28: Venting. 

Monday, November 18, 2019, 14:49: turbo pump on. 

Tuesday, November 19, 2019, 07:07: Waterlines opened. Leak is present.  Turbo pump off. 

Tuesday, November 19, 2019, 11:24: After venting, changed 1 gasket. Setup LD & completed a leak check with the lines pressurized to 75 PSI of He. 

Tuesday, November 19, 2019, 11:25: Roughing. 

Tuesday, November 19, 2019, 11:33: Turbo pump on. 

Wednesday, November 20, 2019, 08:59: Waterlines opened. Leak is present.  Turbo pump off.  

Wednesday, November 20, 2019, 11:26: FEBIAD Removed. U-Line installed to check Evap 2 Connection. FEBIAD examined outside. 

Wednesday, November 20, 2019, 11:34: Turbo pump on. 

Wednesday, November 20, 2019, 13:05: HPA off (Was running through HS line still. Vac @ 5.54e-06T).  

Wednesday, November 20, 2019, 13:07: Open waterline. Vacuum @ 3.88e-06T & dropping steadily.  

Wednesday, November 20, 2019, 13:12: Vacuum @ 3.69e-06T & dropping. No leak detected via Vac. 

Wednesday, November 20, 2019, 13:14: Waterline Closed / purged. Turbo pumps off. 

Wednesday, November 20, 2019, 13:58: Turbo pump on. 

Wednesday, November 20, 2019, 13:50: Cleaned seal / FEBIAD re-installed. Roughing.

Thursday, November 21, 2019, 08:06: Waterlines opened. Vacuum ok @ 4.10e-07T. 

Notes:

1) The FEBIAD left cooling line was the culprit for the leaks. A fine copper build up was noted on the gasket /  sealing face. Images included. 

2) Evap 2 was leak checked separately as well & is OK.

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.

Thursday, October 17, 2019, 12:00

Ta tube was coated with TaC and wrapped with Ta heat-shields (3 layers)

Desired temperature= 1900 C (expected TGHT ~430 A), TBHT will be set fixed at 230A (max).

Evap 2 was pumped down on the previous night.

Good vacuum= 3.00 e-5 Torr

Bad vacuum = 5.00 e-5 Torr

Ramped TGHT and TBHT to 40A at 0.5A/min

Initial IGP1= 7.0 e-07 Torr

Thursday, October 17, 2019, 13:53

After pressure stabilization at 40A:

 Autoramp TGHT and TBHT at 1A/min to 400A and 230A respectively.

 Friday, October 18, 2019, 6:20

TGHT = 400A, 6.52V, TBHT= 233A, 4.1V

OMEGA = 1733C

Start autoramp to 430A on TGHT at 1A/min

Friday, October 18, 2019, 7:05

TGHT= 431A, 7.1V

TBHT= 233A, 4.1V

IGP1= 1.13e-06 Torr

OMEGA = 1828 C

Set autoramp to 465 at 1A/min

Friday, October 18, 2019, 11:13

TGHT = 465A, 7.8V, TBHT = 233A, 4.1V

OMEGA = 1865C

(Something is different with the heat dissipation on this target.  Will leave at this current and start cooling at 1200 noon to avoid container strain)

 Friday, October 18, 2019, 12:00

TGHT = 462.7A, 7.8V

TBHT= 233.4A, 4.1V

OMEGA = 1863C

IPG1= 1.02e-06 Torr

Commence cooling at -2A/min for TGHT and -1A/min for TBHT

 Monday, October 21, 2019, 09:11

Pump down and dismount.

Tuesday, October 08, 2019, 14:14: Remove Flex line HS. 

HS: 42752-1

Waterlines not open yet.

Tuesday, October 08, 2019, 14:15: roughing.

Tuesday, October 08, 2019, 14:24: Turbo pump on. 

Tuesday, October 08, 2019, 14:32: TP @ speed. 

Wednesday, October 09, 2019, 13:24 

The initial pressure was 3.25e-7 Torr

The current was manually increased to 25 A on both TBHT and TGHT  at a rate of 1 A each 30 s for both heaters.

Wednesday, October 09, 2019, 13:33

At 1 pm an additional ram was made to TGHT 350 A and TBHT 200 at same rate.

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

Thursday, October 03, 2019, 08:58

Ta tube was coated with TaC and wrapped with Ta heat-shields (3 layers)

Initial weight including heat-shields = 427 g

Desired temperature = 1900 C (expected TGHT ~430 A), TBHT will be set fixed at 230A (max).

Evap 2 was pumped down previous night.

IGP1= 7.81e-07 Torr

Manually tapping up to ~40A on both TGHT and TBHT at ~1A/min

Good vacuum = 3.00 e-5 Torr

Bad vacuum = 5.00 e-5 Torr

Thursday, October 03, 2019, 09:21

Manually tapped to 50A on TGHT and TBHT

Will allow pressure to stabilize and begin autoramp TGHT and TBHT at 1A/min to 400A and 230A respectively.

autoramp increments might be increased to 2A/min depending on stability of system.

Thursday, October 03, 2019, 10:00

TGHT = 51.6A, 0.36V

TBHT = 49.5A, 0.62V

IGP1=9.6e-7 Torr

Starting autoramp at 1A/min to a max of 400A for TGHT and 230A for TBHT.  Will monitor and increase ramp increments to 2A/min if stable.

Thursday, October 03, 2019, 11:09

TGHT = 103A, TBHT=97A

IGP1=9.1e-06 Torr and dropping

Will increase autoramp increments to 2A/min

Thursday, October 03, 2019, 11:41

With TGHT = 148A, 1.9V and TBHT = 141A, 2.3V

IGP1= 7.9e-6 Torr

Autoramp was increased to 3A/min

Thursday, October 03, 2019, 13:45

TGHT=401A, 6.9V

TBHT=233A, 4.2V

IGP1= 1.14e-05Torr

OMEGA = 1874

begin manual ramp to 1900C

(Temperature dropping as pressure drops)

 Thursday, October 03, 2019, 14:11

 TGHT= 416A, 7.1V

TBHT=233A, 4.2V

OMEGA = 1900 C

IGP1= 6.9e-06 Torr and trending down

Thursday, October 03, 2019, 15:24

TGHT manually bumped to 421A,  7.2 V because temperature dropped slightly.

Thursday, October 03, 2019, 19:00

TGHT manually increased to 425A, 7.3V

Thursday, October 03, 2019, 19:12

TGHT = 424.9A, 7.3V

TBHT=233.2A, 4.1V

OMEGA= 1897 C

IGPA=1.45e-06 Torr

Starting ramp-down at -1A/min on TGHT and 0.5A/min on TBHT

Friday, October 04, 2019, 11:34

Container taken out.

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. 

 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. 

Swapped out VCRs on HS to tray connection. (Right one felt slightly off)

Tuesday, September 17, 2019, 13:23: roughing.

Tuesday, September 17, 2019, 13:32: Turbo pump on. 

Tuesday, September 17, 2019, 13:44: waterlines re-opened. No vacuum response. Ok. @ 7.90e-05T & dropping. 

Wednesday, September 18, 2019, 08:05: Vacuum ok @ 6.87e-07T. Turbo pump off. 

Wednesday, September 18, 2019, 08:21: Venting. 

Pumped down again easy for Ta#59. Issue resolved.

 Ta#59 LP-SIS target description:

Total Ta foils = 470 [6x20 packs + 350 single discs]

Foil Thickness = 0.025mm

Target density =  13.74 g/cm3

Target length = 3.4 cm

Total Mass =  46.7314 g [Incl foils + Ta wire on 6 packs]

Total mass w/ Target oven=  436 g (440 g w/ end caps)

Discs in target are arranged as follows: 1pack / 75singles / 1pack / 100singles / 2packs / 100singles / 1pack / 75singles / 1pack

End caps installed (not yet expanded). No Ta heat shield added.

Monday, September 16, 2019, 14:47: Roughing. 

Monday, September 16, 2019, 14:55: Turbo pump on. 

Monday, September 16, 2019, 15:04: Timed out. Open RV1

Monday, September 16, 2019, 15:05: Restart Turbo pump.

Monday, September 16, 2019, 15:14: Attempt stop / restart before timeout. 

Monday, September 16, 2019, 15:21: Turbo pump unable to pass 4krpm. Close for re-attempt tomorrow am.

Tuesday, September 17, 2019, 12:33: Venting. Sort out pump down issues.

TBHT will be ramped up to 230A at 1.0A/min.

TGHT will be ramped up to 650A at 2.0A/min.

Final desired temperature = 1900C.

OMEGA slope = 0.98.

Wednesday, September 18, 2019, 08:50: Omega slope set to 0.98. Power supplies / sources on. vacuum@ 3.34e-05T & dropping. 

Wednesday, September 18, 2019, 08:25: Roughing.

Wednesday, September 18, 2019, 08:34: Turbo pump on. 

Wednesday, September 18, 2019, 10:22: TGHT manually to 40A. Vacuum @ 3.18e-06T.

Wednesday, September 18, 2019, 10:25: Auto-ramping TGHT / TBHT @ 2 / 1 A per min to 350 / 180 A. 

Wednesday, September 18, 2019, 13:43: Vacuum @ 2.30e-06T. Temp @ 1120 deg C. TGHT / TBHT @ 350 / 180 A. 

Wednesday, September 18, 2019, 13:45: Auto-ramping TGHT / TBHT @ 2 / 1 A per min to 550 / 215 A.  

Thursday, September 19, 2019, 06:39: Vacuum @ 8.79e-07T. Temp @ 1722 deg C. TGHT / TBHT @ 550 / 215 A.  

Thursday, September 19, 2019, 06:42: Auto-ramping TGHT / TBHT @ 2 / 1 A per min to 600 / 230 A.   

Thursday, September 19, 2019, 08:18: Auto-ramping TGHT to 630A @ 2 A per min

Step up to desired temp

Thursday, September 19, 2019, 08:49: Vacuum @ 3.22e-06T. TGHT / TBHT 645 (642.7) / 230 (233.44) A. TGHT Voltage= 12.501V. Omega: 1902-1903 deg C. Desired temperature = 1900C reached. 

Thursday, September 19, 2019, 14:17: Vacuum @ 1.45e-06T. Begin auto-cooling TGHT / TBHT @ -1 / -1 A per min. 

Friday, September 20, 2019, 07:59: Turbo pump off. PS / Sources off. 

Friday, September 20, 2019, 08:42: Venting. 

 Wednesday, September 11, 2019, 15:12

A target container coated with TaC elog 455 was loaded with an empty graphite cartridge and set it in the EVAP2

The system is currently pumping down.

The target container was wrapped with 3 new Ta heat shields.

The target container will be heated to 2000 C and the temperature will be held for 4 hours.

 The autoramp was set to:

TGHT 1 A/min, 450 A

TBHT 0.5 A/min, to 230 A

At 500 A on the TGHT, 20 additional amps were programmed to increased at 1 A/min, however, the autoramp increased the current to 520 A without stepping (see figure A). 

The final conditions were:

TGHT: 9.95 V, 565.59 A

TBHT: 4.18 V, 233.43 A

IGP1: 2.2 e-6 Torr

Friday, September 13, 2019, 11:16

After 4 hours the EVAP2 was cooled down

at a rate of TGHT 1 A/min and TBHT 0.5 A/min

The EVAP2 was vented with air.

Friday, September 06, 2019, 11:20

Container was coated with Tac and wrapped with 2 Ta heat shields.

Desired temp=1900 C, Omega slope set =0.990

Chamber pumped down over night and will be initially tapped manually to 40A for both TGHT and TBHT.

Subsequently, current will be automatically ramped up in increments of 1A/min to reach 400A for TGHT and 230A for TBHT.

Then TGHT will be manually tapped to target temperature and allow to stabilize for a minimum of 3 hours.

Good vac at 3.0e-5 Torr

Bad vac at 5.0e-5 Torr

Friday, September 06, 2019, 11:32

IEVAP2:IGP1=9.6e-7 Torr

Tapping to 40A (TGHT and TBHT).

Friday, September 06, 2019, 12:54

Start autoramp

1A/min TGHT and TBHT

IGP1=4.0e-06 Torr

Friday, September 06, 2019, 13:29

TGHT = 70A, TBHT=70A, pressure started to spike rapidly so aborted autoramp and lowered the current to 66A for both TGHT and TBHT.

pressure continued to rise so tapped current to 60A.  A drop observed.  Will allow to stabilize.

Friday, September 06, 2019, 14:06

IGP1=5.3e-06 Torr.  Restart previous ramping. 

At 66A paused ramping.  IPG1= 1.0e-5 Torr

Friday, September 06, 2019, 15:44

IGP1=6.0e-6 Torr

Start modified autoramping: 0.4A/min for TGHT and TBHT.  Will manually tap up in the morning, over ham and eggs. 

Saturday, September 07, 2019, 10:52

 Will tap up to 423 A on TGHT as per attachment #1 regression

IGP1= 1.13e-6 Torr

OMEGA = 1802 C

TGHT= 401.0 A, 6.84V

TBHT=233.6A, 4.1V

Saturday, September 07, 2019, 11:06

Tapped up TGHT to 438A

OMEGA= 1903C

Will monitor and adjust if necessary.

Saturday, September 07, 2019, 15:06

IGP1 =  1.17e-6 Torr

TGHT = 7.46 V, 439.3 A

TBHT = 4.13 V, 233.4 A

Autoramps

TGHT = -2 A/min, TBHT = -1 A/min

Monday, September 09, 2019, 16:34

The EVAP2 was vented and the target container was removed. 

Wednesday, August 28, 2019, 06:00

A graphite insert (with conical caps) was loaded in tantalum tube 

the Ta tube was wrapped with 3 tantalum foils,

a tantalum cap was inserted in one side of the Ta tube and sealed.

The tube was set in the EVAP2 and the furnace was pumped down.

IGP1 = 1.23e-6 Torr.

The current was tapped to 50 A

Autoramp was set to 1 A/min to 400 A.

 Wednesday, August 28, 2019, 12:02

Autoramp reached 400 A

TGHT = 6.57 V, 404.4 A, IGP1=4.7e-6 Torr

Autoramp was set to 450 A at 1A/min

 Wednesday, August 28, 2019, 12:48

Autoramp reached 450 A

TGHT =7.526 V, 450.188 A, IGP1=5.88e-6 Torr

Autoramp was set to 500 A at 1A/min

Wednesday, August 28, 2019, 13:40

Autoramp reached 500 A, temperature 1880 C

TGHT =8.79 V, 501.094A, IGP1=7.48-6 Torr

Autoramp was set to 540 A at 1A/min 

Wednesday, August 28, 2019, 14:03

The autoramp was stopped at 520 A, because according to previous tests that current is enough to have 2000 C,

the temperature read was 1930 C

TGHT =9.23 V, 520.7 A, IGP1=7.8-6 Torr

Wednesday, August 28, 2019, 15:20

The autoramp was set to 540 A at 1A/min

When the ramp stopped the conditions were:

TGHT=9.59 V, 539.5 A, IGP1= 6.08e-6 Torr

Temperature= 1988 C

Manually tapped to 545 A the temperature reached 2000 C

Wednesday, August 28, 2019, 17:08 

To keep the temperature at 2000 or less the current was decreased,

TGHT= 8.91 V, 445.125 A, IGP1=9.93e-7 Torr

Max temperature read: 2001 C

Min temperature read: 1996 C

Tuesday, September 03, 2019, 11:15

The tube was stable at 1950-1960 C during the weekend but today at around 6 am it had a drop in the current indicating mechanical failure 

The autoramp was set to -2A/min to 0 A. 

The tube will be examined and in case that it is not broken it will be set in the EVAP1 to continue heating it.

Monday, September 09, 2019, 16:35  

The tube became brittle and broke.