Thursday, April 20, 2017, 12:38

3 samples are loaded into the Ta boat and wrapped with heat shield (1 long piece, 3 rounds):  2x of B3-92Mpa pellets and 10% pure PAN pellet as control.  See lab book page 32 for more details.

The B3-92Mpa pellets were previously heated to 1550C (TGHT 400A/6.94V), see elog#351

Attempting to heat samples up to 1800C to determine the weight loss and shrinkage. 

Est. TGHT 480A.

OK to auto ramp to 400A at 1A/min.  Check for coating on the window. 

Chamber is currently being pumped down.

 Thursday, April 20, 2017, 14:28

Pressure 3.14e-6 Torr.  Auto ramp TGHT at 1A/min to reach 400A. 

 Friday, April 21, 2017, 10:56

TGHT at 400A/6.75V, temp at 1475C (75C/0.19V lower). 

Tapping up TGHT

 Friday, April 21, 2017, 12:32

TGHT ramped up to 530A/9.85V, temp at 1800C. 

 Friday, April 21, 2017, 15:38

TGHT dropped slightly, no coating on windows. 

Checked with Mikron, agreed with the dropped temp. 

Tapped up TGHt to 545A/10.1V to reach 1800C.  Will keep at that temp for several days.

 Wednesday, April 26, 2017, 17:06

Samples have been heated at 1800C (-25C) for 7 days now (see attachment for archiver). 

Cooling down TGHT at 1A/min.

 Monday, May 08, 2017, 10:05

Turbo pump control box died last week.

Replaced with a new one.

 Wednesday, May 10, 2017, 16:05

Loaded.

HS water valves opened, no leaks detected.

Started auto-ramp at a rate of 1A/30sec to a final setpoint of 580A

Laura Lambert wrote:

Wednesday, May 10, 2017, 16:05 Loaded. HS water valves opened, no leaks detected. Started auto-ramp at a rate of 1A/30sec to a final setpoint of 580A

 Wednesday, May 10, 2017, 21:31: TGHT at 580 A for 1 h. Vacuum came down to 1.4E-6 Torr. TGHT voltage stable. Ramping down.

Anders Mjos wrote:

Laura Lambert wrote:  Wednesday, May 10, 2017, 16:05 Loaded. HS water valves opened, no leaks detected. Started auto-ramp at a rate of 1A/30sec to a final setpoint of 580A    Wednesday, May 10, 2017, 21:31: TGHT at 580 A for 1 h. Vacuum came down to 1.4E-6 Torr. TGHT voltage stable. Ramping down.

 Thursday, May 11, 2017, 10:51

vented in air and opened it up this morning.

Heat shield looks good!

 Thursday, May 11, 2017, 11:25

IGP2 has been having problems where sometimes it turns off and requires simply unplugging and plugging back in.

Ion gauge has been replaced.

At first the vacuum box appeared red on epics and when attempting to reset everything nothing would work and the backing pump would try and turn on then timeout.

Apparently this new ion gauge draws slightly more than the old one and this blew a fuse in the PLC.

Old fuse was 2A, so a new 3A fuse has been replaced - seems to be working fine now. 

Monday, July 10, 2017, 17:28

Two np-SiC fibrous pellets with different applied pressure:

1) 200MPa, 2)  335 MPa (see logbook pg 36 for more details). 

Desired heating temperature: 1550C (Previous setting: TGHT 400A/6.94V)

Two layers of Ta foils wrapped around the target boat.

Chamber is pumping down...

 Tuesday, July 11, 2017, 11:11

Pressured came down to 1.0e-6 Torr. 

Tapping up TGHT.

 Tuesday, July 11, 2017, 11:24

Tapped TGHT up to 45A - pressure stabilized at around 3.0e-5 Torr. 

Auto ramp 1.0A/min to reach 350A before tapping up further.

 Wednesday, July 12, 2017, 10:59

TGHT reached to 350A/5.5V, temp @ 1270C - much lower than expected; could be a short between the target container and the heat shield.  I actually had a had time adjusting the target legs to avoid shorting the cu-heat shield. 

Tapped TGHT further up to 375A/6.07V, Omega Temp at 1340C.  Holding current for about 50 mins, re-measured with pyrometer - temperature matches.

Wednesday, July 12, 2017, 14:49 

TGHT set at 450A/7.7A.  Temp at ~1550C.  See attachment for temp plot

Holding at temp for 5 days before cooling down on Monday July 17.

 Thursday, July 13, 2017, 17:52

TGHT tripped off due to bad IEVAP2:WFB1 water flow.  Not sure what was the cause.  Will leave the heater off for now and investigate this tomorrow.

 Friday, July 14, 2017, 11:48

Investigated the bad water flow situation.  It was due to a faulty water flow sensor.  The paddle wheel stopped turning until I gave it a tab.  We had a similar problem before with the water sensor, see elog ID 109.  It is probably the time to replace all the water sensors. 

 Tuesday, July 18, 2017, 15:26

Problems occured with TGHT water supply paddle wheel stopped and therefore tripped off evap2 last week.

All paddle wheels were replaced today for evap2 [other than the chiller].

A build up of dirt was found on all wheels replaced.

Evap2 good to go.

Will test flow meters before heating up to higher setpoints to confirm everything is working.

Monday, July 31, 2017, 15:24

Turned on BV and TP this afternoon.

Started ramping down, ~1min after turned on both tripped off.

Vacuum box turned red.

IGP1 appears yellow but still registering a vacuum.

TP interlocks: requires IEVAP2:IGP1 < 500mTorr but IGP1 = 6mTorr when tripped off.

Should have been satisfied and therefore not tripped but IGP1 not communicating?

Nothing wrong with ion gauge in person, vacuum good on direct read out.

When attempting 'Global Reset', nothing would reset - vacuum box remained red etc.

See screenshot attached of errors.

 Tuesday, August 01, 2017, 15:31

Had kept BP, PV and RV overnight.

This morning vacuum fine, everything had reset except "IEVAP2:TP on" under device notes for IEVAP2:TP remained red.

Turned on BV and TP, once turbo pump registered on, red wording went away.

Currently pumping down - everything looks fine now.

Still unsure of reason for these errors...

 Friday, August 04, 2017, 10:55

Happened again last night at ~5:45 while evaps at ~420A - see elog i.d. 383 for photos and details.

 Tuesday, August 08, 2017, 14:57

See elog i.d's #384 and #381

Investigated wiring in PLC.

Some wires in PLC were not creating a good contact - could be problem re: IGP1 tripping off.

Wires replaced by Gelo.

Pumped down and turned on power supplies over weekend.

Everything remained on - IGP1 did not trip system off.

May proceed with regular use.

Monday, August 21, 2017, 17:09

Two pellets of sol-gel SiO2+CNT were produced.  See lab book pg 44-46 for details. 

Samples were loaded in Ta boat, wrapped with heat shield (1 layer)

Synthesis temperature = 1600C.  TGHT ~ 460A/8.0V

Vacuum at 7.5 e-6 Torr.

TGHt Auto-ramp at 01A/min to reach 350A. 

 Thursday, August 24, 2017, 00:28

TGHT reached to 350A/5.9V, temp @ 1230C (in-line with the last measurement see elog 378).

Increase TGHT to 430, ramp at 0.1A/min.

 Thursday, August 24, 2017, 23:42

TGHT reached to 430A/7.87V, temp at 1410C. Outgassing pressure reached to peak at 430A before TGHT stabilized.  (Evolution of SiO(g)???)

Ramp up to 460A at 0.1A/min.

 Friday, August 25, 2017, 10:30

TGHT reached to 460A/8.6V, temp at 1520C.  More outgassing was observed as temp was increased.

Tapping up TGHT to reach 1600c.

Friday, August 25, 2017, 15:17

Temp reached to 1600C; TGHT at 492 A/9.3 V.  Temperature was held for 3 hours.  Due to a problem with the backing pump, the cooling down process was initiated. 

Sample will be taken out next Monday for evaluation.

 Tuesday, September 12, 2017, 12:00:

The coated back window was changed to a shuttered window.

On star-point flange bolt interfered with the shutter, however it was removed, shortened, and re-installed.

The installation is complete. Awaiting roughing pump to leak check.

Wednesday, September 27, 2017, 18:05

 3 samples from NS-npSiC pellets, pressured at 10T  (see lab book pg 53)

3 samples from B3 pellets, 600MPa (see lab book pg 50)

Desired temperature = 1550C, est current = 450A

 Thursday, September 28, 2017, 11:17

Vac at 8.8e-7 Torr.  

Ramping TGHT up to 450A at 0.2A/min

 Thursday, September 28, 2017, 17:54

Setup screen capture, see pg 53 for saved directory

 Friday, September 29, 2017, 23:54

TGHT reached to 450A/7.9V, temp at 1510C.

Tapping up TGHT to 465/8.2V to reach 1550C

Pressure coming down from 1.6e-6 Torr.

See attachment 1 for the 20-hour plot

 Sunday, October 01, 2017, 00:30

At around 20:00 on Sep 30, there was an increase of ~0.1 V which caused a rise in temp from 1550 to 1576C (see screen capture).  Pressure increased slightly.

Tapped down TGHT to 445A/8.05V; temp maintained at 1550C.

 Monday, October 02, 2017, 17:55

Cooling TGHT from 445A/8.07V, 1500oC to room temperature at 1A/min

 Tuesday, October 03, 2017, 11:09

Target has been cooled for over 10 hours. 

Venting chamber

Wednesday, October 04, 2017, 16:37

3 samples of npSiC/PAN cast-pellets, see lab book p. 57 for details.

Desired temperature 1550C, expected TGHT ~450A.

Chamber pumped down.

TGHT ramping at 0.2A/min

 Friday, October 06, 2017, 10:45

TGHt at 450A/7.7A, temp at 1510C.  (p.s voltage is lower than before, elog 389).

Tapped up to 466A/8.08v, temp reached to 1550C.  A slight increase in pressure when tapping up TGHT. (see attached screen capture)

Will maintain heating temperature for several days before cooling down

 Tuesday, October 10, 2017, 10:50

Samples was heated for several days at 1550C. 

Cooling down initiated at 2A/min.

 Tuesday, October 10, 2017, 18:07

Chamber is vented.

Process done

Monday, November 06, 2017, 18:21

Samples of Horn and Probe - npSiC. see pg 74.

6 samples in total, to be heated to 1550C, about 450A.  Set ramping rate at 0.2A/min.  

Chamber pumping down

 Tuesday, November 07, 2017, 15:01

TGHT reached to 450A/8.2V, temperature measured at 1460C.  See attachment 1.

Increased ramping to 480A, targeting 1550C.

 Tuesday, November 07, 2017, 22:26

Samples have been heating at 1550C with TGHT at 480A/8.78V for about 8 hours.

Vacuum stabilizes at 8.4e-7 Torr.

Initial cooling at 2A/min.

 Wednesday, November 08, 2017, 10:36

Venting chamber.

 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

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.

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.

 Monday, December 11, 2017, 14:21

Dave updated evap2 interlock limits to 500mTorr for TGHT and TBHT on friday