John Wong wrote:

Laura Lambert wrote: John Wong wrote: Monday, February 02, 2015, 16:28 Container is coated with TaC.  No Ta foil wrapped around.  Chamber is being pumped down. TGHT/TBHT will be ramped up to 580A/230A at 0.2A/min.      Tuesday, February 03, 2015, 10:28 HS water valves opened; no leaks detected. IGP1 = 5.9e-7 Torr  Wednesday, February 04, 2015, 11:10 attempted to initiate manual ramp up of TGHT and TBHT yesterday, but not responding to EPICS currently sitting under vacuum, waiting on fix...  Wednesday, February 04, 2015, 14:16 controls fixed. initiated auto-ramp.  Thursday, February 05, 2015, 08:56 IGP1 = 4.1e-7 Torr TGHT = 290A TBHT = 225A Increasing auto-ramp to 1.0A/min  Thursday, February 05, 2015, 13:49 IGP1 = 1.4e-6 Torr TGHT = 569A TBHT = 232A Increasing auto-ramp to 2.0A/min    Thursday, February 05, 2015, 18:02 Auto-cooling TGHT to 400A at 1A/min.  Need to take voltage reading tomorrow.

 Tuesday, February 10, 2015, 09:35

Vented and opened this morning.

Container fully sintered.

Laura Lambert wrote:

John Wong wrote: Monday, February 02, 2015, 16:28 Container is coated with TaC.  No Ta foil wrapped around.  Chamber is being pumped down. TGHT/TBHT will be ramped up to 580A/230A at 0.2A/min.      Tuesday, February 03, 2015, 10:28 HS water valves opened; no leaks detected. IGP1 = 5.9e-7 Torr  Wednesday, February 04, 2015, 11:10 attempted to initiate manual ramp up of TGHT and TBHT yesterday, but not responding to EPICS currently sitting under vacuum, waiting on fix...  Wednesday, February 04, 2015, 14:16 controls fixed. initiated auto-ramp.  Thursday, February 05, 2015, 08:56 IGP1 = 4.1e-7 Torr TGHT = 290A TBHT = 225A Increasing auto-ramp to 1.0A/min  Thursday, February 05, 2015, 13:49 IGP1 = 1.4e-6 Torr TGHT = 569A TBHT = 232A Increasing auto-ramp to 2.0A/min

 Thursday, February 05, 2015, 18:02

Auto-cooling TGHT to 400A at 1A/min.  Need to take voltage reading tomorrow. 

John Wong wrote:

Monday, February 02, 2015, 16:28 Container is coated with TaC.  No Ta foil wrapped around.  Chamber is being pumped down. TGHT/TBHT will be ramped up to 580A/230A at 0.2A/min.

 Tuesday, February 03, 2015, 10:28

HS water valves opened; no leaks detected.

IGP1 = 5.9e-7 Torr

 Wednesday, February 04, 2015, 11:10

attempted to initiate manual ramp up of TGHT and TBHT yesterday, but not responding to EPICS

currently sitting under vacuum, waiting on fix...

 Wednesday, February 04, 2015, 14:16

controls fixed.

initiated auto-ramp.

 Thursday, February 05, 2015, 08:56

IGP1 = 4.1e-7 Torr

TGHT = 290A

TBHT = 225A

Increasing auto-ramp to 1.0A/min

 Thursday, February 05, 2015, 13:49

IGP1 = 1.4e-6 Torr

TGHT = 569A

TBHT = 232A

Increasing auto-ramp to 2.0A/min

Monday, February 02, 2015, 16:28

Container is coated with TaC.  No Ta foil wrapped around. 

Chamber is being pumped down.

TGHT/TBHT will be ramped up to 580A/230A at 0.2A/min.

 See previous e-log entry for details

 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.

 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, 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

 Wednesday, November 19, 2014, 15:10

currently pumping down

 Wednesday, November 19, 2014, 15:28

container is wrapped with 3 x Ta-heat shield

leak check done

Starting voltage = -0.017mV

TGHT = 0A, 0V

TBHT = 0A, 0V

IGP1 = 1.7e-6 Torr

 Wednesday, November 19, 2014, 16:33

Tapped TGHT up manually to 100A

DV [direct voltage] = 0.33V

TGHT = 109A

TBHT = 0A

IGP1 = 1.3e-6 Torr

Initiating auto-ramp of TGHT to 400A at 2A/min

 Thursday, November 20, 2014, 09:49

DV = 3.47V

OMEGA = 1645C

TGHT = 401A, 6.49V

TBHT = 0

IGP1 = 4.5e-7Torr

TGHT finished auto-ramping ~19:00 last night

initiating manual tap up to 2000 celsius or 580A [whichever is higher] and recording activity

 Friday, November 21, 2014, 12:50

TGHT was ramped up to 580A yesterday and left overnight.

In the picture attached one can see the TGHT current has remained constant at 578A [red = TGHT current, green = TGHT voltage]

The vacuum has slowly gone down as expected.

However, the DV, TGHT voltage and temperature have deviated. They have dipped up and down several times throughout the night. The first deviation was observed ~3.5hours after it reached its target of 580A.

DV reached 6.02V [when TGHT initially hit 580A] and increased to 6.27V after 3.5hrs and is currently sitting at 5.94V

OMEGA reached 2111C [when TGHT initially hit 580A] and increased to 2154C after 3.5 hrs and is currently sitting at 2094C

TGHT voltage reached 10.4V [when TGHT initially hit 580A] and increased to 10.6V after 3.5hrs and is currently sitting at 10.3V

 Friday, November 21, 2014, 17:59

EVAP2 sat at max setting: TGHT = 580A and TBHT = 230A for ~4hours

Initiating auto-cool TGHT 2A/min, TBHT 1A/min

 Monday, November 24, 2014, 14:28

Vented and opened this morning.

No notable changes on target container.

[See attachments for more detailed information of results]

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...

Laura Lambert wrote:

Thursday, October 23, 2014, 15:34 *See elog #142 for target description* one endcap still in place, one removed for OMEGA-IR2C beam to reach material [see pic] no heat shields currently being pumped down  Friday, October 24, 2014, 11:34 EVAP2 pumped down overnight. IGP1 = 7e-7 Torr HS water valves opened, no leaks detected. TGHT will be ramped up to 1400C TBHT will be ramped up to 230A  Friday, October 24, 2014, 14:32 TBHT reached 230A, TGHT reached 1400C Stepped TGHT up manually to 1600C; TGHT = 693A, 10.6V [see pic]  Friday, October 24, 2014, 15:58 TGHT = 760A, 12.07V [local read back] = setpoint. epics readback TGHT = 754.8A, 11.76V OMEGA = 1700C Friday, October 24, 2014, 16:26 OMEGA = 1800C epics readback TGHT = 828.7A, 13.15V Friday, October 24, 2014, 16:34 OMEGA = 1900C epics readback TGHT = 899A, 14.53V Friday, October 24, 2014, 16:46 OMEGA = 2000C epics readback TGHT = 967A, 15.8V MIKRON target spot on SiC = 1650C, e = 0.97

 Tuesday, November 04, 2014, 15:59

Target was heated up to 2000C and last for about 1.5 days before the right leg (ionizer points into the page) broke off. 

Interesting discovery...  The "yellowish" crystals are forming on the discs. 

Suspecting a phase transformation of 6H (hexagonal/- alpha SiC (hexagonal) polytype to 3C(cubic) - beta SiC

More study needs to be done... 

See elog # 168.

The leg of this target was repaired in the Machine shop. 

THIS TARGET WILL NOT BE USED ONLINE -  IT WILL BE USED FOR OFFLINE R&D PURPOSES.

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. 

 Thursday, October 23, 2014, 15:34

*See elog #142 for target description*

one endcap still in place, one removed for OMEGA-IR2C beam to reach material [see pic]

no heat shields

currently being pumped down

 Friday, October 24, 2014, 11:34

EVAP2 pumped down overnight.

IGP1 = 7e-7 Torr

HS water valves opened, no leaks detected.

TGHT will be ramped up to 1400C

TBHT will be ramped up to 230A

 Friday, October 24, 2014, 14:32

TBHT reached 230A, TGHT reached 1400C

Stepped TGHT up manually to 1600C; TGHT = 693A, 10.6V [see pic]

 Friday, October 24, 2014, 15:58

TGHT = 760A, 12.07V [local read back] = setpoint.

epics readback TGHT = 754.8A, 11.76V

OMEGA = 1700C

Friday, October 24, 2014, 16:26

OMEGA = 1800C

epics readback TGHT = 828.7A, 13.15V

Friday, October 24, 2014, 16:34

OMEGA = 1900C

epics readback TGHT = 899A, 14.53V

Friday, October 24, 2014, 16:46

OMEGA = 2000C

epics readback TGHT = 967A, 15.8V

MIKRON target spot on SiC = 1650C, e = 0.97

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.

Laura Lambert wrote:

John Wong wrote: Laura Lambert wrote:  Thursday, October 02, 2014, 11:51 Target container sprayed with TaC, currently drying in fume hood  Monday, October 06, 2014, 12:11 Target container & back block is wrapped with 3 layers of Ta-heat shield.  The chamber has been pumped down over the weekend.  Pressure currently at 2.23e-7 Torr.  HS water valves open; no leaks detected. TGHT will be ramped up to 580A at 0.2A/min TBHT will be ramped up to 230A at 0.2A/min.    Monday, October 06, 2014, 12:16 Stepped up both TGHT/TBHT to 35A.  Tuesday, October 07, 2014, 12:54 TBHT reached to 230A/3.7V and TGHT is still ramping up, currently at 303A/4.5V. Temp measured with Omega-IR2 = 1165C with e'=0.85 Pressure @ 5.2e-7 Torr.  Increase ramping rate to 2A/min.  Tuesday, October 07, 2014, 16:21 TGHT is now at 580A and TGHT at 230A. Temperature is measured with OMEGA-IR2, MIKRON, and analog pyrometer - All the measurements are agreed at 1700C (without the tantalum emissivity correction of 250C) The OMEGA-IR2 slope has changed to 0.97 for the correction - The real temperature reading from the display is showing 1935C. Now... attempting to low TBHT to see any temperature change.  Tuesday, October 07, 2014, 17:01 TGHT @ 580A. TBHT = 180C, Temp = 1925C TBHT = 130C, Temp = 1920C Not much of change in the temperature on the target tube... Tuesday, October 07, 2014, 17:07 Attempting to increase the temperature to 2000C TGHT = 600A, Temp = 1955C TGHT = 620A, Temp = 2000C Target will continue heating at this temperature overnight... Will continue to monitor.  Tuesday, October 07, 2014, 20:59 After almost 4 hours of heating at 620A on TGHT, the temperature has dropped to 1980C.   Pressure is coming down to 1.17e-6 Torr.   Increased TGHT to 630A to maintain temp @ 2000C    Wednesday, October 08, 2014, 11:46 Temperature readout from omega-IR2C = 2054C TGHT = 11.14V, 628.0A TBHT = 2.01V, 129.8A IGP1 = 8.2e-7Torr Initiating auto-cool for TGHT @ 2A/min, TBHT @ 1A/min  Thursday, October 09, 2014, 16:00 vented in air and opened up this morning target container looks good!

 Thursday, October 09, 2014, 16:36

Photos for the OMEGA-IR2C temp measurement can be found on this link (see also the subfolder for the heating process):

https://www.dropbox.com/sh/n5sxcepg7e847xw/AACMubuKW1idd49D1Nz_0diNa?dl=0

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...

John Wong wrote:

Laura Lambert wrote:  Thursday, October 02, 2014, 11:51 Target container sprayed with TaC, currently drying in fume hood  Monday, October 06, 2014, 12:11 Target container & back block is wrapped with 3 layers of Ta-heat shield.  The chamber has been pumped down over the weekend.  Pressure currently at 2.23e-7 Torr.  HS water valves open; no leaks detected. TGHT will be ramped up to 580A at 0.2A/min TBHT will be ramped up to 230A at 0.2A/min.    Monday, October 06, 2014, 12:16 Stepped up both TGHT/TBHT to 35A.  Tuesday, October 07, 2014, 12:54 TBHT reached to 230A/3.7V and TGHT is still ramping up, currently at 303A/4.5V. Temp measured with Omega-IR2 = 1165C with e'=0.85 Pressure @ 5.2e-7 Torr.  Increase ramping rate to 2A/min.  Tuesday, October 07, 2014, 16:21 TGHT is now at 580A and TGHT at 230A. Temperature is measured with OMEGA-IR2, MIKRON, and analog pyrometer - All the measurements are agreed at 1700C (without the tantalum emissivity correction of 250C) The OMEGA-IR2 slope has changed to 0.97 for the correction - The real temperature reading from the display is showing 1935C. Now... attempting to low TBHT to see any temperature change.  Tuesday, October 07, 2014, 17:01 TGHT @ 580A. TBHT = 180C, Temp = 1925C TBHT = 130C, Temp = 1920C Not much of change in the temperature on the target tube... Tuesday, October 07, 2014, 17:07 Attempting to increase the temperature to 2000C TGHT = 600A, Temp = 1955C TGHT = 620A, Temp = 2000C Target will continue heating at this temperature overnight... Will continue to monitor.  Tuesday, October 07, 2014, 20:59 After almost 4 hours of heating at 620A on TGHT, the temperature has dropped to 1980C.   Pressure is coming down to 1.17e-6 Torr.   Increased TGHT to 630A to maintain temp @ 2000C

 Wednesday, October 08, 2014, 11:46

Temperature readout from omega-IR2C = 2054C

TGHT = 11.14V, 628.0A

TBHT = 2.01V, 129.8A

IGP1 = 8.2e-7Torr

Initiating auto-cool for TGHT @ 2A/min, TBHT @ 1A/min

 Thursday, October 09, 2014, 16:00

vented in air and opened up this morning

target container looks good!

Laura Lambert wrote:

Thursday, October 02, 2014, 11:51 Target container sprayed with TaC, currently drying in fume hood  Monday, October 06, 2014, 12:11 Target container & back block is wrapped with 3 layers of Ta-heat shield.  The chamber has been pumped down over the weekend.  Pressure currently at 2.23e-7 Torr.  HS water valves open; no leaks detected. TGHT will be ramped up to 580A at 0.2A/min TBHT will be ramped up to 230A at 0.2A/min.

 Monday, October 06, 2014, 12:16

Stepped up both TGHT/TBHT to 35A. 

Tuesday, October 07, 2014, 12:54

TBHT reached to 230A/3.7V and TGHT is still ramping up, currently at 303A/4.5V. Temp measured with Omega-IR2 = 1165C with e'=0.85

Pressure @ 5.2e-7 Torr. 

Increase ramping rate to 2A/min.

 Tuesday, October 07, 2014, 16:21

TGHT is now at 580A and TGHT at 230A.

Temperature is measured with OMEGA-IR2, MIKRON, and analog pyrometer - All the measurements are agreed at 1700C (without the tantalum emissivity correction of 250C)

The OMEGA-IR2 slope has changed to 0.97 for the correction - The real temperature reading from the display is showing 1935C.

Now... attempting to low TBHT to see any temperature change.

 Tuesday, October 07, 2014, 17:01

TGHT @ 580A.

TBHT = 180C, Temp = 1925C

TBHT = 130C, Temp = 1920C

Not much of change in the temperature on the target tube...

Tuesday, October 07, 2014, 17:07

Attempting to increase the temperature to 2000C

TGHT = 600A, Temp = 1955C

TGHT = 620A, Temp = 2000C

Target will continue heating at this temperature overnight... Will continue to monitor.

 Tuesday, October 07, 2014, 20:59

After almost 4 hours of heating at 620A on TGHT, the temperature has dropped to 1980C.  

Pressure is coming down to 1.17e-6 Torr.  

Increased TGHT to 630A to maintain temp @ 2000C

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 02, 2014, 11:51

Target container sprayed with TaC, currently drying in fume hood

 Monday, October 06, 2014, 12:11

Target container & back block is wrapped with 3 layers of Ta-heat shield.  The chamber has been pumped down over the weekend. 

Pressure currently at 2.23e-7 Torr. 

HS water valves open; no leaks detected.

TGHT will be ramped up to 580A at 0.2A/min

TBHT will be ramped up to 230A at 0.2A/min.