Monday, November 30, 2015, 15:37

No heat shields.

Container empty.

Loaded into evap2 and currently pumping down.

Tuesday, December 01, 2015, 10:07 

HS water valves opened this morning, no leaks detected.

IGP1 = 4.3e-7 Torr.

Slope of OMEGA = 0.98

Tapped up manually to 35A.

Vacuum stable, initiating auto-ramp at 2.0A/min and 1.0A/min for the TGHT and TBHT respectively.

Final setpoints: TBHT = 90A, TGHT = 360A

Once final setpoints reached, will tap up manually to max 1800C [legs = 2000C]

 Monday, December 07, 2015, 09:06

Container was tapped up manually with emissivity measurements taken every 50A starting at 360A.

The final measurement was taken at 640A.

Container was ramped down for the weekend.

See attachment for raw data.

 Monday, December 07, 2015, 09:04

No heat shields.

Container empty.

IGP1 = 1.1e-7 Torr.

Slope of OMEGA = 0.98

Tapped up manually to 35A.

Vacuum stable, initiating auto-ramp at 2.0A/min and 1.0A/min for the TGHT and TBHT respectively.

Final setpoints: TBHT = 90A, TGHT = 360A

Will tap up with the same parameters as last round to confirm results.

 Friday, December 11, 2015, 11:44

Took out of evap2 yesterday.

Aurelia took many emissivity measurements to compare with previous data - which matched up.

The dip in emissivity before going up again around ~560A could be due to oxidation of the materials.

 Wednesday, December 16, 2015, 10:09

Target consists of 505 discs.

Total packed length 3.4cm.

*same parameters at Ta#46*

Total mass of target materials 53.9381g [4 packs of 20 with Ta wire + 425 single discs].

3 x Ta Heat shields.

No Re foil inserted.

No endcaps inserted.

Chamber pumped down overnight.

IGP1 = 5.1e-7 Torr.

Tapped up manually to 35A.

IGP1 = 5.2e-7 Torr.

Vacuum stable, initiating auto-ramp.

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

TGHT will be ramped up to 1800C, auto ramp to 600A at 2.0A/min [estimated final value of 720A according to elog ID 239]

 Wednesday, December 16, 2015, 15:08

TBHT reached max setpoint of 230A, 3.3V

TGHT = 600A, 8.9V

IGP1 = 1.1e-6 Torr.

OMEGA = 1543C

Increasing final setpoint of TGHT to 700A and re-initiating auto-ramp.

 Wednesday, December 16, 2015, 16:02

TGHT = 700A, 10.6V

IGP1 = 2.1e-6 Torr.

OMEGA = 1740C

Tapping up manually to 1800C.

 Wednesday, December 16, 2015, 16:28

TGHT = 730A, 11.2V

Vacuum is coming down from IGP1 = 2.6e-6 Torr.

OMEGA = 1800C

Will condition the target at 1800C overnight and ramp down in the morning.

 Thursday, December 17, 2015, 09:31

OMEGA = 1802C on right side

Temp on leg of left side = 2150C, the hottest point - measured with the Mikron pyrometer.

 Friday, December 18, 2015, 08:53

Evap2 remained at 1800C for ~26.5hrs

Auto-ramped down to TGHT = 300A and TBHT = 90A at a rate of 2.0A/min and 1.0A/min respectively.

Conditioning complete.

TGHT will be ramped up later today for emissivity measurements.

 Monday, January 04, 2016, 11:21

the following was performed by aurelia.

emissivity measurements were taken late december.

evap2 was cooled down and left under vacuum over the xmas break.

currently ramping back up for more emissivity measurements.

 Friday, January 08, 2016, 10:47

Aurelia done measurements.

vented and opened this morning.

Aurelia Laxdal wrote:

Temperature measurements in progress this week for Ta HP-SIS.

 Friday, January 08, 2016, 10:49

Rh foil added.

endcaps inserted and expanded.

total length of target with end caps = 3.45cm

spot weld one thermocouple onto center block and one thermocouple onto target leg [left side wrt ionizer tube into page].

 see elog id# 268 for more info regarding measurements taken and state of TBHT power supply...

Monday, January 11, 2016, 15:25

Small center block LP-SIS container previously sintered with TaC coating

3x Ta heat shields

Container is loaded with 260 discs of SiC with a total length of 8.5cm

Loaded into evap2 and pumped down this morning

HS water valves opened up, no leaks detected

Tapped up manually to 30A

Vacuum stable

IGP1 = 1e-6 Torr

Initiating auto-ramp at 0.2A/min and 0.1A/min for the TGHT and TBHT respectively

Final setpoints: 400A for the TGHT and 230A for the TBHT

Final desired temperature: 1700C

 Tuesday, January 12, 2016, 12:55

TGHT = 138A, TBHT = 80A

IGP1 =  7.7e-6 Torr.

Vacuum stable and coming down.

Increasing ramping rate to 0.5A/min and 0.2A/min for the TGHT and TBHT respectively.

 Wednesday, January 13, 2016, 09:32

TGHT reached 400A ~11.5hrs ago

TBHT reached 230A ~8hrs ago

OMEGA = 1400C

IGP1 = 1.75e-7 Torr

Tapping up manually to 1700C...

 Wednesday, January 13, 2016, 10:14

Previous temperature measurement of OMEGA = 1400C is wrong due to window port being coated with SiC [see attached photos]

Will remain at TGHT = 420A for 4hrs then cool down this afternoon

Wednesday, January 13, 2016, 14:29

Remained at max setpoints for 4.5hrs.

Initiating auto-cool at 2.0A/min and 1.0A/min for the TGHT and TBHT respectively.

 Thursday, January 14, 2016, 09:47

Vented in air and opened up this morning

Target looks good

Will insert and expand endcaps this afternoon

 Thursday, January 14, 2016, 11:47

Backing pump was making very loud high pitched noises during last couple processes in the evaporator.

Replaced with a new one this morning.

 Friday, February 12, 2016, 11:01

Container coated with TaC with new method - ends tapped off,  liquid poured/swirled around container, then poured back out - 'flushing technique'.

Container wrapped with 3 x Ta heat shields, incl center block - new method of each layer being one long single Ta foil covering entire container incl center block

IGP1 = 6.3e-7Torr

HS water valves opened, no leaks detected.

Tapped up manually to 35A.

Waited ~20min.

Vacuum stable, IGP1 = 1.3e-6 Torr.

Initiated auto-ramp at 0.2A/min and 0.1A/min for the TGHT and TBHT respectively with final setpoints of 400A and 230A.

 Monday, February 15, 2016, 08:56

IGP1 = 3.9e-7 Torr.

TBHT = 230A, 4.0V

TGHT = 400A, 6.58V

OMEGA = 1766C

Tapping up manually to 1900C...

 Monday, February 15, 2016, 10:18

IGP1 = 5e-7 Torr

TGHT = 450A, 7.55V

OMEGA = 1913C

 Monday, February 15, 2016, 14:30

IGP1 = 4.9e-7 Torr.

TGHT = 450A, 7.55V.

Material remained at ~1910C for ~4hrs.

Initiating auto-cool at 2.0A/min and 1.0A/min for the TGHT and TBHT respectively.

 Tuesday, February 16, 2016, 14:17

vented in air and opened up this morning.

target container sintered nicely.

 Tuesday, February 16, 2016, 14:19

coated with TaC yesterday and let dry overnight.

wrapped with one long Ta heat shield - wrapped around tube 3x, with Ta wire to offset Ta foil away from container

loaded into evap2 and currently pumping down.

 Wednesday, February 17, 2016, 10:51

HS water valves opened, no leaks detected.

Tapped up manually to 35A.

Waited ~20min, vacuum stable.

IGP1 = 5.9e-7 Torr.

Initiating auto-ramp at 0.2A/min to a final setpoint of 400A.

Final desired temperature = 1900C

 Thursday, February 18, 2016, 09:16

IGP1 = 6.6e-7 Torr.

TGHT = 303A, 4.3V

OMEGA = 1311C

Increasing ramping rate to 1.0A/min.

John Wong wrote:

Laura Lambert wrote:  Tuesday, February 16, 2016, 14:19 coated with TaC yesterday and let dry overnight. wrapped with one long Ta heat shield - wrapped around tube 3x, with Ta wire to offset Ta foil away from container loaded into evap2 and currently pumping down.  Wednesday, February 17, 2016, 10:51 HS water valves opened, no leaks detected. Tapped up manually to 35A. Waited ~20min, vacuum stable. IGP1 = 5.9e-7 Torr. Initiating auto-ramp at 0.2A/min to a final setpoint of 400A. Final desired temperature = 1900C  Thursday, February 18, 2016, 09:16 IGP1 = 6.6e-7 Torr. TGHT = 303A, 4.3V OMEGA = 1311C Increasing ramping rate to 1.0A/min.    Thursday, February 18, 2016, 13:10 TGHT reached to 450A, temp at 1800C.  Stepped up TGHT 490A, temp measured at ~1900C.

Thursday, February 18, 2016, 17:21

TGHT remained at max setpoint for 4hrs.

IGP1 = 6.6e-7 Torr.

OMEGA = 1913C

Initiating auto-cool for TGHT at 2.0A/min.

 Friday, February 19, 2016, 14:17

evap2 vented and opened up this morning.

container looks good.

Aurelia Laxdal wrote:

Started Ta#47 heating at Evap2 using the autoramp program. The TGHT current is setup to go to 300A (for now) and the TBHT to 230A (final value).

 Monday, March 14, 2016, 09:20

One thermocouple was not welded on correctly and is not working. 

Cooling evap2 back down, to remove target and re-weld thermocouple.

Once thermocouple replaced, will ramp back up and continue with tests/ conditioning of target.

Tuesday, April 26, 2016, 13:32

Container coated with TaC using 'flushing technique'.

Wrapped with 3 x Ta heat shields, incl center block - new method of each layer being one long single Ta foil covering entire container incl center block

Currently pumping down in evap2

 Wednesday, April 27, 2016, 10:25

IGP1 = 2.6e-7 Torr.

HS water valves opened, no leaks detected.

Tapped up manually to 35A.

Waited ~35min

Vacuum stable, IGP1 = 6.7e-7 Torr

Initiated auto-ramp at 0.2A/min for the TGHT with a final setpoint of 400A

Final desired temperature = 1900C

 Thursday, April 28, 2016, 14:41

Previously TBHT not on when sintering IGLIS container [since no ionizer tube] - John decided will turn on for this round

Tapped up TBHT manually to 140A, 1.69V

IGP1 = 4.5e-7 Torr

OMEGA = 1635C

TGHT = 382A, 5.8V

Initiating auto-ramp of TBHT at 0.1A/min with a final setpoint of 230A.

Friday, April 29, 2016, 08:40

IGP1 = 2.22-7 Torr

TGHT = 400A, 6.1V

TBHT = 233A, 2.9V

OMEGA = 1719C

Tapping up manually to OMEGA = 1900C

Friday, April 29, 2016, 15:22

IGP1 = 3.0e-7 Torr

TGHT = 460A, 7.52V

TBHT =230A, 2.93V

OMEGA = 1904C

Target container has remained at max temperature setpoint of 1900C for 4.5hrs.

Initiating auto cool for TGHT and TBHT at 2.0A/min and 1.0A/min respectively.

 Monday, May 02, 2016, 08:35

Vented in air and opened up this morning.

Container looks good.

See attached photos.

 Tuesday, May 03, 2016, 14:29

Turned vacuum pump on this morning, sounded awful: loud grinding bad noises.

Called vacuum group, will replace pump tomorrow morning.

Sounds like materials coming out from all the out-gassing during sintering processes has ruined the bearings.

 Wednesday, May 04, 2016, 13:28

Target boat has a layer of niobium foil on the bottom of the boat.

A niobium foil has been made with slots to hold samples [similar to when sintering endcaps] *See attached photos

Larger niobium samples are placed in the slots, holding in place, to avoid warping; smaller niobium sample sitting inside the boat by itself.

Smaller sample closest to OMEGA IR reading [right side]

Boat is wrapped with 1 large layer of Ta foil, wrapped around the boat 3x, careful to avoid touching samples.

Loaded into evap2 yesterday.

Vacuum pump bearings gone - pump replaced this morning by vacuum group.

Pumping down now...

 Friday, May 06, 2016, 13:36

HS water valves opened, no leaks detected.

Tapped up manually to 35A.

IGP1 = 2.4e-7 Torr

Setting auto-ramp rate at 0.2A/min to 250A over the weekend.

Will tap up manually monday to final desired temperature of 1400C.

 Monday, May 09, 2016, 09:38

OMEGA = 1128C

IGP1 = 1.3e-7 Torr

TGHT = 250A, 3.7V

Tapping up manually to 1400C...

 Monday, May 09, 2016, 14:05

Evap2 has reached ~1405C

TGHT = 341A, 5.34V

IGP1 = 1.9e-7 Torr

Will remain at max setpoints for min 4hrs then initiate cool down.

John Wong wrote:

Laura Lambert wrote:  Wednesday, May 04, 2016, 13:28 Target boat has a layer of niobium foil on the bottom of the boat. A niobium foil has been made with slots to hold samples [similar to when sintering endcaps] *See attached photos Larger niobium samples are placed in the slots, holding in place, to avoid warping; smaller niobium sample sitting inside the boat by itself. Smaller sample closest to OMEGA IR reading [right side] Boat is wrapped with 1 large layer of Ta foil, wrapped around the boat 3x, careful to avoid touching samples. Loaded into evap2 yesterday. Vacuum pump bearings gone - pump replaced this morning by vacuum group. Pumping down now...  Friday, May 06, 2016, 13:36 HS water valves opened, no leaks detected. Tapped up manually to 35A. IGP1 = 2.4e-7 Torr Setting auto-ramp rate at 0.2A/min to 250A over the weekend. Will tap up manually monday to final desired temperature of 1400C.  Monday, May 09, 2016, 09:38 OMEGA = 1128C IGP1 = 1.3e-7 Torr TGHT = 250A, 3.7V Tapping up manually to 1400C...  Monday, May 09, 2016, 14:05 Evap2 has reached ~1405C TGHT = 341A, 5.34V IGP1 = 1.9e-7 Torr Will remain at max setpoints for min 4hrs then initiate cool down.    Monday, May 09, 2016, 18:18 TGHT at 341A/5.34V for over 4 hours.  Vac stables at 1.78e-7 Torr. Cooling down at 2A/min

 Tuesday, May 10, 2016, 08:45

Vented in air and opened up this morning.

Samples look good!

John Wong wrote:

The purpose of this experiment is to determined the limiting operating temperature for Beta-SiC.  To do so, samples will be heated in sequence to observe any volatile Si coated on the window.  The coating is observed above 1400C for the conventional SiC (mixuture of alpha and beta) and this coating leads to HV shorting problem.  Thursday, May 19, 2016, 14:26 Beta-SiC (size ~1um) slurry was prepared and casted on a graphite foil.  Discs are cut into D-shape Average thickness (including graphite foil) = 0.349mm Graphite foil = 0.13mm Actual SiC thickness = 0.219mm (close to normal SiC thickness) Samples are loaded into a target boat. Total discs = 120 Total mass = 14.3507g Thursday, May 19, 2016, 14:32 Omega slope set to = 1.04 Heat-treatment #1: 1400C  Thursday, May 19, 2016, 17:04 TGHT ramping up to 250A at 0.5A/min

 Friday, May 20, 2016, 08:53

IGP1 = 9.2e-6 Torr.

Increasing ramping rate to 1.0A/min up to 250A

 Friday, May 20, 2016, 09:17

IGP1 = 2.1e-5 Torr

TGHT = 215A, 3.1V

OMEGA = 1035C

Stopping auto-ramp and tapping up manually...

 Friday, May 20, 2016, 12:26

OMEGA slope changed to 1.04

OMEGA reached ~1430C and kept there for ~1hr.

no change. no coating on window observed

tapped up manually to OMEGA =1500C

TGHT = 350A, 5.8V

 Friday, May 20, 2016, 14:17

Not much change to window.

Might be beginning of light dusting, hard to tell.

Will be better observed after longer period of time at 1500C

Will remain at 1500C over weekend.

 Wednesday, May 25, 2016, 11:37

Container coated with TaC using 'flushing technique' [cleaned ionizer tube with acetone, so no coating inside ionizer tube]

Wrapped with 2 x Ta heat shields - one full height of Ta foil wrapped around cooling fins twice

Currently pumping down in evap2

 Thursday, May 26, 2016, 09:28

Tapped up manually to 40A

IGP1 = 6.6e-7 Torr

Initiating auto-ramp at 0.2A/min and 0.1A/min for the TGHT and TBHT respectively.

Final setpoints for TGHT = 650A and TBHT = 230A

Once max setpoints reached will continue to tap up manually while monitoring temperature to 1900C

 Thursday, June 09, 2016, 15:39

First target using beta-SiC material!

Target container contains 450 discs of SiC [4 x 5 packs + 430 single discs]

Target packed length = 16cm. 

Mass of 533 discs SiC(green)  = 53.8758g

Container is wrapped with 3 heatshields; no end caps are inserted yet - coated spring inserted both sides to hold discs in place.

Sintering temp = 1800C, TGHT will be set accordingly.  TBHT max at 230A. 

Chamber is currently being pumped down. 

Friday, June 10, 2016, 13:24

HS water valves opened, no leaks detected.

Tapping up manually to 70A...

Auto ramp will be set for TGHT = 0.2A/min to a final setpoint of 520A

Auto-ramp for TBHT = 0.1A/min to a final setpoint of 230A.

John Wong wrote:

Laura Lambert wrote:  Thursday, June 09, 2016, 15:39 First target using beta-SiC material! Target container contains 450 discs of SiC [4 x 5 packs + 430 single discs] Target packed length = 16cm.  Mass of 533 discs SiC(green)  = 53.8758g Container is wrapped with 3 heatshields; no end caps are inserted yet - coated spring inserted both sides to hold discs in place. Sintering temp = 1800C, TGHT will be set accordingly.  TBHT max at 230A.  Chamber is currently being pumped down.  Friday, June 10, 2016, 13:24 HS water valves opened, no leaks detected. Tapping up manually to 70A... Auto ramp will be set for TGHT = 0.2A/min to a final setpoint of 520A Auto-ramp for TBHT = 0.1A/min to a final setpoint of 230A.      Friday, June 10, 2016, 16:27 TGHT stepped up to 70A/0.55V.  TGHT at 50A/0.62V.  Pressure stabilized at 5.5e-5 Torr. Initiated auto ramping.  TGHT at 0.2A/min --> 520A.  TBHT at 0.1A/min --> 230A.

 Monday, June 13, 2016, 09:51

TGHT = 425A, 5.65V

TBHT = 225A, 3.7V

IGP1 = 8.7e-6 Torr.

Increasing ramping rate to 1.0A/min...

 Monday, June 13, 2016, 15:56

Tapped up manually from 520A to 1800C

Extrapolated data on graph to determine correct current required to reach desired max temperature.

Will remain at 1800C for ~48hrs

See attachements for excel sheet and screenshot of striptool.

John Wong wrote:

Laura Lambert wrote: John Wong wrote:   Laura Lambert wrote:  Thursday, June 09, 2016, 15:39 First target using beta-SiC material! Target container contains 450 discs of SiC [4 x 5 packs + 430 single discs] Target packed length = 16cm.  Mass of 533 discs SiC(green)  = 53.8758g Container is wrapped with 3 heatshields; no end caps are inserted yet - coated spring inserted both sides to hold discs in place. Sintering temp = 1800C, TGHT will be set accordingly.  TBHT max at 230A.  Chamber is currently being pumped down.  Friday, June 10, 2016, 13:24 HS water valves opened, no leaks detected. Tapping up manually to 70A... Auto ramp will be set for TGHT = 0.2A/min to a final setpoint of 520A Auto-ramp for TBHT = 0.1A/min to a final setpoint of 230A.      Friday, June 10, 2016, 16:27 TGHT stepped up to 70A/0.55V.  TGHT at 50A/0.62V.  Pressure stabilized at 5.5e-5 Torr. Initiated auto ramping.  TGHT at 0.2A/min --> 520A.  TBHT at 0.1A/min --> 230A.    Monday, June 13, 2016, 09:51 TGHT = 425A, 5.65V TBHT = 225A, 3.7V IGP1 = 8.7e-6 Torr. Increasing ramping rate to 1.0A/min...  Monday, June 13, 2016, 15:56 Tapped up manually from 520A to 1800C Extrapolated data on graph to determine correct current required to reach desired max temperature. Will remain at 1800C for ~48hrs See attachements for excel sheet and screenshot of striptool.    Wednesday, June 15, 2016, 17:54 TGHT at 710A, 11.35V.  TBHT at 230A/3.86V.  Omega reading droppd to 1130C due to coating on windows.  Ionizer tube was measured (center) at around 1900C Cooling down at 2A/min for TGHT, 1A/min for TBHT.  Samples will be collected prior to cleaning the windows. NEXT:  Conditioning.

Thursday, June 16, 2016, 09:29

vented in air and opened up this morning.

took some samples to be tested.

 Thursday, June 16, 2016, 10:59

Previously sintered over weekend [see elog i.d 306]

Target container contains 450 discs of SiC [4 x 5 packs + 430 single discs]

Target packed length = 16cm. 

Mass of 533 discs SiC(green)  = 53.8758g

Container is wrapped with 3 heatshields; no end caps are inserted yet - coated spring inserted both sides to hold discs in place.

Conditioning temp = 1800C.

TGHT max = 710A according to sintering data.  TBHT max = 230A. 

Chamber is currently being pumped down. 

 Thursday, June 16, 2016, 15:43

Target was not removed from evap2 after sintering, vented and cleaned windows only.

HS water valves already open.

Stepped up manually to 70A, vacuum stable.

Initiated auto-ramp at 1.0A/min for the TGHT and 0.5A/min for the TBHT with max setpoints of 600A and 230A respectively.

TGHT = 118A, 0.9V

TBHT = 90A, 1.1V

IGP1 = 7.3e-7 Torr

 Friday, June 17, 2016, 12:14

TGHT has been tapped up manually to reach max desired temperature of 1800C

TGHT = 690A, 10.85V

TBHT = 230A, 3.88V

IGP1 = 4.9e-7 Torr

This is a lower current than the current required to reach 1800C during the sintering process.

For sintering, the max current was determined via extrapolation of trendline from raw data due to interference of coating on window and unable to take reliable readings from OMEGA.

For this conditioning process ~1800C is reached on the OMEGA since the window is still ~un-coated.

Will remain at 690A, ~1800C for several days to maximize conditioning process.

See attachment for raw data.

 Monday, June 20, 2016, 09:01

At the end of the day on friday 17th, OMEGA read ~1750C - no change in the current or voltage, vacuum was stable, this was the max setpoints used to reach 1800C.

This morning OMEGA = 2040C

TGHT = 690A, 10.95V

vacuum stable at IGP1 = 1.8e-7 Torr.

Slightly more noticeable coating on window port, looks like a thin ink layer, still relatively thin coating [ see attached image]

Also attached is archive from over wknd to show vacuum stable, current unchanged and voltage negligibly changed [only gone up by ~0.1V]

 Friday, June 24, 2016, 13:52

Container has remained at max setpoints for 7 days.

Initiating auto-cool for TGHT @ 2.0A/min and for TBHT @ 1.0A/min.

Will vent chamber and remove from evap2 to pass off for assembly monday morning.

See attachment for updated excel on temperature readings for the conditioning process.

 Monday, June 27, 2016, 08:28

vented in air and removed this morning.

target looks good!

all discs remained nicely alligned.

discs expanded outwards ~1cm, pushed back in to keep target length at 16cm

no visible yellow crystals like previous SiC targets 

endcaps inserted and expanded.

Rh foil inserted.

Ta heat shield foils removed, fins look good.

see photos attached for pictures of target - post conditioning.

coating on window very hard to remove. looked like a light sharpy pen coating on window. ended up scratching off with acetone and screw driver. couldn't remove all of it...