John Wong wrote:

Laura Lambert wrote:  Tuesday, August 05, 2014, 12:02 The target container end caps were coated with TaC spray and let dry. The caps are inserted in the target boat vertically, wrapped in graphite foil with 3 x Ta-heat shield. [see attached photo] The chamber is currently being pumped down.    Tuesday, August 05, 2014, 17:19 HS water valve opened; no leaks detected.  Pressure @ 2.5e-6 Torr. Ramping up TGHT to 580A @ 1A/min.

 Thursday, August 07, 2014, 08:11

Yesterday the target boat was taken out.

The boat broke as it turns out it was used for a Niobium target and therefore wasn't coated with TaC.

The end caps were fully sintered.

 Thursday, October 02, 2014, 11:22

It was found that after the last process, Evap#2 has broken insulators - the cylinder insulator that supports the target centre legs and the block insulator that supports the terminals.  

Informed Anders/Rick.

John Wong wrote:

Thursday, October 02, 2014, 11:22 It was found that after the last process, Evap#2 has broken insulators - the cylinder insulator that supports the target centre legs and the block insulator that supports the terminals.   Informed Anders/Rick.

 Friday, October 03, 2014

• Insulators replaced. Torque 55 in lbs on all fasteners.
• Cleaned TGHT terminals with scotch-brite and methanol.
•  New (clean) heat shield prepared WO-39230-2.
• Re-installed right side heat shield alignment pin (previously removed to allow line of sight to the target).

Thursday, October 09, 2014, 15:56

The target boat contains 5 samples of Nb discs.  Each disc is wrapped with Nb foil and labelled. 

Samples will be heated up to 1400C for 4 hours. 

chamber has been pumped down to 3.9e-6 Torr. HS valves open - no leaks detected.

Ramping up TGHT...

Thursday, October 09, 2014, 17:36

Target boat consists of 5 Nb discs.  Each disc is wrapped with Nb foil, and to be heated to 1400C for 4 hours.

Chamber has been pumped down to 6.5e-7 Torr.  HS valves open - no leaks detected.

TGHT has ramped to 330A to maintain the 1400C temperature. 

At 21:30, the target will be cooled down.

Temperature can be monitored from this link:

https://www.dropbox.com/sh/kor6gnutnlimqxw/AAAee2yb-Hj3JEbBysrAW2oYa?dl=0

 Thursday, October 09, 2014, 22:48

Samples have been heated at 1420C for over 4 hours.  

Pressure at 6.6 e-7 Torr. 

Cooling process initiated, ramping down at 2A/min. 

 Friday, October 10, 2014, 13:50

Samples were successfully conditions; no signs of any damage.

Tuesday, November 04, 2014, 16:08

The purpose of this experiment is to improve the fabrication of SiC.  Previously, the SiC target was heated to 2000c and yellow crystals were observed.

In this experiment, 10g of SiC powder (7um size) was previously milled down (actual size to be determined under SEM).  The powder was mixed with 5% PVA and the slurry was pour onto a glass and let dry.  The semi-dry slurry was rolled up into balls. The SiC balls were let dry in over (115C) over night. Taken out 2.903g SiC + 5% PVA, it's rolled up with a small sheet of graphite foil.  Then the targer boat is filled with the sample and wrapped with 3-layers of Ta-heat shield.

The sample will be heated up to 2000C to see if the yellow crystals are reproducible.  It is suspected that there might be a phase transformation from 6H alpha-SiC to 3C beta-SiC. 

Chamber is currently being pumped down... 

Wednesday, November 05, 2014, 14:04

TGHT was ramped up over night, currently at 485A = 1800 C. 

Will do manual step up to get to 2000C. 

Monday, November 10, 2014, 13:51

target container was sprayed with TaC on friday and sintered over the weekend.
vented and removed from evap2 this morning, looks good.

this container will be used as a round2 for UCx #11 since the last container broke as it was being assembled.

hopefully all the materials can be recovered and re-used/re-loaded into the new container...

 Wednesday, November 26, 2014, 13:47

OMEGA-IR laser had a dark patch on it [see picture]

Cleaned window, still dark patch

When tested by itself, through air, not through window, patch still visible - cleaned lens of OMEGA-IR, still no change.

Conclusion: assuming laser used to be able to focus the OMEGA-IR to a specific area - so visual only, but the measurements itself will not be affected.

Wednesday, November 26, 2014, 13:53 

Backing pump trips off every time roughing valve turned on through epics.

Requested further investigation...

Friday, November 28, 2014, 12:09

Backing Pump has been replaced, waiting on a reply from OMEGA re: dark patch on laser

Pancake monitor was also acting funny. Background was reading 100cpm and jumping up to as high as 400cpm by simply moving the probe piece.

The wire connecting the probe to the monitor was replaced and works fine now.

 Tuesday, December 09, 2014, 15:55

Finally got a reply from the OMEGA people:

"That [ dark patch] would happen because of sharp bends in the fiber, or simply defective fiber cable.

As manufacturer we allow 2% of broken fibers, out of 870 in the bundle.

As far as measurements is concerned, if IR2 is used in dual colour mode, 

the field of view can be obstructed as much as 50%, 

without changing the readings accuracy. This laser issure should not affect readings."

-Quote from Brian Newport from OMEGA

 Thursday, December 11, 2014, 10:17

water supply and return valves closed for lab closure over the holidays.

all taps leading into evap2 have been closed.

evap2 was fully flushed leaving no water left inside the system.

 Wednesday, January 14, 2015, 13:46: Roughing

Wednesday, January 14, 2015, 14:57: Starting turbo

Monday, January 19, 2015, 13

Water opened up to one circuit at at time. No response on the vacuum could be seen.

IGP1 at 1.7E-7 T

IGP2 at 3E-8 T

Tuesday, January 20, 2015, 13:11: Stopped turbo and roughing pump.

Wednesday, January 21, 2015, 15:46: Venting

Rick and Anders found CG1A to be reading too high a value. A borrowed gauge from the vacuum group confirmed this. A new gauge will be installed

Thursday, January 22, 2015, 14:06: Roughing

Thursday, January 22, 2015, 14:18: Venting

The reading is consistent between CG1A and CG1B, which simplifies pump down.

 See previous e-log entry for details

 Friday, May 22, 2015, 11:43

A target boat was sprayed with TaC coating and let dry yesterday.

The target boat is wrapped with 3-layers of Ta-heat shield.

The boat was installed in EVAP2, chamber is currently being pumped down.

 Friday, May 22, 2015, 14:22

HS water valves opened, no leaks detected.

IGP1 = 2.4e-6 Torr.

Tapping up manually...

 Friday, May 22, 2015, 14:33

Tapped up to 20A.

Vacuum jumped up to 7e-6 Torr.

Backed off to 5A before vacuum started to drop again.

IGP1 = 5e-6 Torr.

Tapping up manually again...just more slowly...

 Friday, May 22, 2015, 15:31

Tapped up to 12A, unable to tap up very fast due to volatile content in coating.

IGP1 = 3.6e-6 Torr.

Initiating auto-ramp at 0.1A/min with a max current of 580A.

 Monday, May 25, 2015, 09:03

IGP1 = 3e-7 Torr.

TGHT = 397.5A, 6.43V

Increasing ramping rate to 1.0A/min.

 Thursday, June 04, 2015, 9:07

Container was sprayed with TaC and let dry.

Container has 3x Ta heat shields including center block.

Container was loaded into EVAP2 yesterday and pumped down overnight.

HS water valves were opened up this morning, no leaks detected.

IGP1 = 4.6e-7 Torr.

Tapped up manually to 40A.

Waited ~25min, Vacuum stable.

IGP1 = 5.0e-7 Torr.

Initiating auto-ramp.

TGHT will be ramped to reach 2000C

 Friday, June 05, 2015, 10:01

IGP1 = 4.5e-7 Torr.

TGHT = 313A, 4.47V

OMEGA = 1444C

Increasing ramping rate to 1.0A/min

 Friday, June 05, 2015, 11:31

IGP1 = 1.2e-6 Torr.

Increasing ramping rate to 2.0A/min

Laura Lambert wrote:

Thursday, June 04, 2015, 9:07 Container was sprayed with TaC and let dry. Container has 3x Ta heat shields including center block. Container was loaded into EVAP2 yesterday and pumped down overnight. HS water valves were opened up this morning, no leaks detected. IGP1 = 4.6e-7 Torr. Tapped up manually to 40A. Waited ~25min, Vacuum stable. IGP1 = 5.0e-7 Torr. Initiating auto-ramp. TGHT will be ramped to reach 2000C  Friday, June 05, 2015, 10:01 IGP1 = 4.5e-7 Torr. TGHT = 313A, 4.47V OMEGA = 1444C Increasing ramping rate to 1.0A/min  Friday, June 05, 2015, 11:31 IGP1 = 1.2e-6 Torr. Increasing ramping rate to 2.0A/min

 Friday, June 05, 2015, 12:01

TGHT reached to 465A/7.56V, temp is stable at 2000C. Current vac at 1.2e-6 Torr and coming down

Cooling down process can be initiated after 4 hours. 

Tuesday June 16, 2015

An Extraction Insulator ITD0381 made from a different grade of AiN was installed in Evaporator 2 for testing purposes. The sub assembly included the SIS Restraint Housing ITD0389, New Extraction Insulator ITD0381, Repeller Electrode ITD0377, Extraction Electrode ITD0374 with fingerstock mounted.

The standoff insulator ITD0400 was found to be swelled up and broken. It was replaced with and glazed alumina insulator.

The tube heater Insulator ITD0342 - central support helicoil was repaired.

 Thursday, July 30, 2015, 17:02

EVAP1 cooling system is now on the NALCW.  The city water has been removed from the system.  

Tested all the cooling system interlocks by shutting off each individual valve, and the main supply valve to the lab -  All Passed!  

Friday, July 31, 2015, 15:09

The left side port was installed on the evaporator #2.  Leak check was performed and no leak was detected. 

 Friday, July 31, 2015, 15:39

A Ta tube was coated with TaC.  The inner of the tube was filled with TaC solution and the excess was drained out to give a homogenous coating.  The outer layer of the tube was brushed with TaC. 

The tube is installed in a target boat and wrapped with 3 layers of heat shields.  

Chamber is currently pumped down and the target heater will be ramped up after the long weekend (Tue)

A new window port is installed (see photo).  TGHT will need to be ramped up slowly to make sure the new window can sustain the heat shine from the target - local check on the Evap is required to make sure it's safe to keep ramping up the heater.     

John Wong wrote:

Friday, July 31, 2015, 15:39 A Ta tube was coated with TaC.  The inner of the tube was filled with TaC solution and the excess was drained out to give a homogenous coating.  The outer layer of the tube was brushed with TaC.  The tube is installed in a target boat and wrapped with 3 layers of heat shields.   Chamber is currently pumped down and the target heater will be ramped up after the long weekend (Tue) A new window port is installed (see photo).  TGHT will need to be ramped up slowly to make sure the new window can sustain the heat shine from the target - local check on the Evap is required to make sure it's safe to keep ramping up the heater.

Tuesday, August 04, 2015, 11:26

HS water valves opened, no leaks detected.

IGP1 = 2.2e-7 Torr.

Tapped up manually to 30A.

IGP1 = 2.7e-7 Torr.

Initiating auto-ramp at 0.2A/min with a final value of 350A.

 Tuesday, August 04, 2015, 15:30

IGP1 = 2.8e-6 Torr.

TGHT = 79A.

Increasing ramping rate to 0.5A/min

 Wednesday, August 05, 2015, 15:25

EVAP2 reached 350A this morning, OMEGA = 1414C

Temperature measurements were taken using the FLUKE IR camera of the new window port to be used for the second OMEGA camera.

Measurements were taken of both the Cu seal on the inside of the window and in the centre of the window [the hottest point].

TGHT was ramped up at 2.0A/min from 1414C --> 1800C with auto ramp paused at each measurement reading taken.

See attachment for raw data.

TGHT remained at 500A/1800C for 4hrs and will be cooled down at a rate of 2.0A/min.

 Thursday, August 06, 2015, 15:32

Vented and opened today.

New window port passed inspection, max temperature reached = 32.4C

Coating on tube looks good, partial sintering. Internal sintered better than outside of tube.

See attached photos.

 Thursday, August 06, 2015, 15:36

The endcaps are stacked together with a punched out disc of graphite foil placed in between each endcap for separation so endcaps won't fuse together.

The end caps are further wrapped in a larger piece of graphite foil to hold together as a tube [same method used in elogID # 158]

There are two separate tubes in the target boat:

1) endcaps coated with TaC coating - never been sintered

2) previously sintered [but not fully] endcaps with a second coating done on the one side of each endcap

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

Chamber is currently being pumped down.

 Friday, August 07, 2015, 08:45

HS water valves opened, no leaks detected.

IGP1 = 3.6e-7 Torr.

Tapped up manually to 30A.

 Friday, August 07, 2015, 11:23

IGP1 = 2.2e-6 Torr.

Vacuum stable.

Initiating auto-ramp at 0.2A/min with a final setpoint of 480A.

Will ramp up over the weekend, confirm temperature readings on monday and tap up to final desired temperature of 1800C manually.

 Friday, August 07, 2015, 13:04

Vacuum climbed quite fast.

IGP1 = 6.3e-6 Torr.

Stopped auto-ramp to allow vacuum to settle.

Waited ~1hr.

IGP1 = 4.3e-6 Torr.

Re-initiating auto-ramp.

 Monday, August 10, 2015, 09:22

TGHT reached 480A, 8.2V on the weekend.

OMEGA = 1708C

IGP1 = 3.8e-7 Torr.

Tapped up manually to 1803C, 520A, 9.0V

IGP1 = 5.9e-7 Torr.

 Monday, August 10, 2015, 14:50

EVAP2 remained at 1800C for 4.5hours.

Internal temperature taken at new window port read 1800C using the mikron.

Initiating auto-cool at 2.0A/min.

 Tuesday, August 11, 2015, 09:23

Vented in air and opened up this morning.

The following observations were noted:

1) single round sintered endcaps:

-Batch of green endcaps, single round of sintering look good. fully sintered.

-however when applying a scratch test, excess TaC scrapes off.

[see single round sintering photos]

-A few endcaps almost heated too long and started to appear brittle/ further crystallization on inside of endcap - the side that did not have a second coating applied.

-Outside of endcap looks good/ fully sintered - the side that had a second round of TaC coating

-further tests confirm this batch should still be okay to use

[see round2 batch photos]