Laura Lambert wrote:

Monday, August 08, 2016, 15:19 Previously sintered over weekend [see elog i.d 311] Target container contains 471 discs of SiC [6 x 5 packs + 441 single discs] Target packed length = 16cm.  Mass of 533 discs SiC(green)  = 52.7172g 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 = 450A.  TBHT max = 230A.  Chamber is currently being pumped down.   Monday, August 08, 2016, 16:38 Target was not removed from evap2 after sintering, vented and cleaned windows only. IGP1 = 5.5e-6 Torr Stepped up manually to 80A, vacuum stable. IGP1 = 3.2e-6 Torr Initiating auto-ramp at 0.2A/min for the TGHT and 0.1A/min for the TBHT.  Thursday, August 11, 2016, 14:14 Tues the TGHT reached ~280A via auto-ramp Evap2 was then tapped up manually to 480A/ ~1800C Temperature readings on OMEGA have fluctuated up and down during conditioning process which was also observed for SiC#33 Also consistent with SiC#33, a lower current was required to reach 1800C during the conditioning process compared to the sintering process. See attached link for data.  Tuesday, August 16, 2016, 16:25 TGHT remained at 480A, 9.2V for ~7 days. IGP1 = 6.5e-6 Torr OMEGA = 1470C [with window coating, so temperature reading compromised] Initiating auto cool at 2.0A/min and 1.0A/min for the TGHT and TBHT respectively. Wednesday, August 17, 2016, 13:40 Vented in air and opened this morning. Target broke   Target clearly heated to high. See attached snapshot of striptool from conditioning process. Will update later with photos of broken container

 Tuesday, August 30, 2016, 15:17

A better look at the p/s voltage over the course of the constant heating at 480A.  (see attachment).

The striptool shows the voltage was not giving a stable output.  There were multiple occasions that the voltage dropped and then recovered; the obvious was on Aug 16.  This indicates that  the target was breaking up.

Finally on Aug 17, the voltage dropped and never recovered again - that indicates the target was broken.

 Monday, August 08, 2016, 15:19

Previously sintered over weekend [see elog i.d 311]

Target container contains 471 discs of SiC [6 x 5 packs + 441 single discs]

Target packed length = 16cm. 

Mass of 533 discs SiC(green)  = 52.7172g

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 = 450A.  TBHT max = 230A. 

Chamber is currently being pumped down. 

 Monday, August 08, 2016, 16:38

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

IGP1 = 5.5e-6 Torr

Stepped up manually to 80A, vacuum stable.

IGP1 = 3.2e-6 Torr

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

 Thursday, August 11, 2016, 14:14

Tues the TGHT reached ~280A via auto-ramp

Evap2 was then tapped up manually to 480A/ ~1800C

Temperature readings on OMEGA have fluctuated up and down during conditioning process which was also observed for SiC#33

Also consistent with SiC#33, a lower current was required to reach 1800C during the conditioning process compared to the sintering process.

See attached link for data.

 Tuesday, August 16, 2016, 16:25

TGHT remained at 480A, 9.2V for ~7 days.

IGP1 = 6.5e-6 Torr

OMEGA = 1470C [with window coating, so temperature reading compromised]

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

Wednesday, August 17, 2016, 13:40

Vented in air and opened this morning.

Target broke  

Target clearly heated to high.

See attached snapshot of striptool from conditioning process.

Will update later with photos of broken container

 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...

 Friday, June 20, 2014, 11:14

Made from batch's: oct 23/2013, oct 31/2013 and june 2012

Total number of foils: 515 discs

Total mass of materials [incl graphite foils]: 64.7224g

Total length packed: 17.8cm

Container is wrapped with 3x Ta-heat shields.

Currently being pumped down.

 Friday, June 20, 2014, 14:56

HS cooling water valves opened, no leaks detected.

IGP1 = 6.2e-6 Torr

TGHT max = 820A/ 17V

TBHT max = 300A/ 5V

Stepping up manually to 40A

 Friday, June 20, 2014, 16:04

IGP1 = 8e-6 Torr

Slowly stepped up to 35A manually.

Vacuum has stabilized.

Initiating auto-ramp at 0.1A/min

Laura Lambert wrote:

Friday, June 20, 2014, 11:14 Total number of foils: 515 discs Total mass of materials [incl graphite foils]: 64.7224g Total length packed: 17.8cm Container is wrapped with 3x Ta-heat shields. Currently being pumped down.  Friday, June 20, 2014, 14:56 HS cooling water valves opened, no leaks detected. IGP1 = 6.2e-6 Torr TGHT max = 820A/ 17V TBHT max = 300A/ 5V Stepping up manually to 40A  Friday, June 20, 2014, 16:04 IGP1 = 8e-6 Torr Slowly stepped up to 35A manually. Vacuum has stabilized. Initiating auto-ramp at 0.1A/min

 Friday, June 20, 2014, 16:16

Changing the heating current... 

From the previous SiC targets, TGHT was ramped up to 800A and yellow crystals were found; the end caps and target legs were also found broken (see my iPad).  This might be too hot for the Ta-boat to handle the sintering process. 

For this process,

TGHT will ramp up to 600A and TBHT to 230A over the weekend. 

Then, the temperature will be measured.  The sintering temperature of SiC is ~1800 - 2000C. 

John Wong wrote:

Laura Lambert wrote:  Friday, June 20, 2014, 11:14 Total number of foils: 515 discs Total mass of materials [incl graphite foils]: 64.7224g Total length packed: 17.8cm Container is wrapped with 3x Ta-heat shields. Currently being pumped down.  Friday, June 20, 2014, 14:56 HS cooling water valves opened, no leaks detected. IGP1 = 6.2e-6 Torr TGHT max = 820A/ 17V TBHT max = 300A/ 5V Stepping up manually to 40A  Friday, June 20, 2014, 16:04 IGP1 = 8e-6 Torr Slowly stepped up to 35A manually. Vacuum has stabilized. Initiating auto-ramp at 0.1A/min    Friday, June 20, 2014, 16:16 Changing the heating current...  From the previous SiC targets, TGHT was ramped up to 800A and yellow crystals were found; the end caps and target legs were also found broken (see my iPad).  This might be too hot for the Ta-boat to handle the sintering process.  For this process, TGHT will ramp up to 600A and TBHT to 230A over the weekend.  Then, the temperature will be measured.  The sintering temperature of SiC is ~1800 - 2000C.

 Monday, June 23, 2014, 09:45

IGP1 = 5e-6 Torr

TGHT and TBHT are at ~200A

Increasing ramping rate to 0.2A/min

 Monday, June 23, 2014, 11:19

IGP1 = 6.9e-6 Torr

Increasing ramping rate to 2.0A/min

Monday, June 23, 2014, 12:09

JW:  Pressure went up too fast... lower the TGHT ramping up rate to 1A/min.

 Tuesday, June 24, 2014, 16:06

Increasing current with respect to temperature: See attached table

Laura Lambert wrote:

John Wong wrote: Laura Lambert wrote:  Friday, June 20, 2014, 11:14 Total number of foils: 515 discs Total mass of materials [incl graphite foils]: 64.7224g Total length packed: 17.8cm Container is wrapped with 3x Ta-heat shields. Currently being pumped down.  Friday, June 20, 2014, 14:56 HS cooling water valves opened, no leaks detected. IGP1 = 6.2e-6 Torr TGHT max = 820A/ 17V TBHT max = 300A/ 5V Stepping up manually to 40A  Friday, June 20, 2014, 16:04 IGP1 = 8e-6 Torr Slowly stepped up to 35A manually. Vacuum has stabilized. Initiating auto-ramp at 0.1A/min    Friday, June 20, 2014, 16:16 Changing the heating current...  From the previous SiC targets, TGHT was ramped up to 800A and yellow crystals were found; the end caps and target legs were also found broken (see my iPad).  This might be too hot for the Ta-boat to handle the sintering process.  For this process, TGHT will ramp up to 600A and TBHT to 230A over the weekend.  Then, the temperature will be measured.  The sintering temperature of SiC is ~1800 - 2000C.     Monday, June 23, 2014, 09:45 IGP1 = 5e-6 Torr TGHT and TBHT are at ~200A Increasing ramping rate to 0.2A/min  Monday, June 23, 2014, 11:19 IGP1 = 6.9e-6 Torr Increasing ramping rate to 2.0A/min Monday, June 23, 2014, 12:09 JW:  Pressure went up too fast... lower the TGHT ramping up rate to 1A/min.  Tuesday, June 24, 2014, 16:06 Increasing current with respect to temperature: See attached table

 Tuesday, June 24, 2014, 23:44

Target has been heated at 600A.  Local temperature measured on the right leg = 1814C. 

RGA/ striptool/temperature data can be found on this link: 

https://www.dropbox.com/sh/69memvh6fthodoz/AABZiSKAR9njhbqO4sBATVbla

Something interesting was observed about the out gassing of this target - the right window was coated when the temperature rose above 1500C (on the right end, could be hotter inside?) - see attachment.

I suspect this is Si vapour deposited on the window when the target heater got closed to the sintering temperature for SiC (1800 - 2000C).  

Once the chamber is vented, the coated window will be inspected and analyzed.  More details later...  

Initiate auto-cooling (slow cool down)  TGHT 1A/min; TBHT 0.5/min.  Chamber should be able for venting tomorrow afternoon.  

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

 Nb#9 LP-SIS target description:

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

Foil Thickness = 0.025mm

Target density =  7.24 g/cm3

Target length = 3.5 cm

Total Mass = 25.343 g [Incl foils + Ta wire on 6 packs]

Total mass w/ Target oven=  425 g (w/ end caps)

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

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

Final desired temperature = 1900C.

OMEGA slope = 0.98.

Wednesday, October 21, 2020, 14:09: Roughing. 

Wednesday, October 21, 2020, 14:32: Turbo pump on. 

Wednesday, October 21, 2020, 15:29: Waterlines opened. Vacuum ok @ 1.05E-05T. 

Wednesday, October 21, 2020, 15:30: TGHT / TBHT PS on. Slope Set.

Wednesday, October 21, 2020, 19:06: Auto-ramping TGHT / TBHT to 300 / 100 @ 1 A per min. Vacuum @ 1.85e-06T.

Thursday, October 22, 2020, 07:26: Auto-ramping TGHT / TBHT to 500 / 200 @ 2 A per min. Vacuum @ 7.61e-07T.

Thursday, October 22, 2020, 11:28: Auto-ramping TGHT / TBHT to 580 / 230 @ 2 A per min. Vacuum @ 1.53e-06T. The Omega IR2C is back. Temp @ 1576 deg C.

Thursday, October 22, 2020, 12:22: Auto-ramping TGHT to 625 A @ 2 A per min. Vacuum @ 2.47e-06T. Temp @ 1734 C.  

Thursday, October 22, 2020, 12:48: Auto-ramping TGHT to 645 A @ 2 A per min. Vacuum @ 3.11e-06T. Temp @ 1815 C.   

Thursday, October 22, 2020, 13:10: Auto-ramping TGHT to 660 A @ 2 A per min. Vacuum @ 3.39e-06T. Temp @ 1851 C.  

Thursday, October 22, 2020, 13:25: Manually tap up TGHT until 1900 C. Vacuum @ 3.53e-06T.

Thursday, October 22, 2020, 13:30: TGHT @ 673 A. Temp @ 1903 C. Vacuum @  3.79e-06T.

Thursday, October 22, 2020, 14:00: Auto-cooling @ 1 A per min. 

Friday, October 23, 2020, 07:50: PS off. Turbo pump off. Purge waterline. 

Friday, October 23, 2020, 09:02: Venting. 

 Nb#11 LP-IG-LIS target description:

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

Foil Thickness = 0.025mm (0.001")

Target density =  7.13 g/cm3

Target length = 3.53 cm

Total Mass = 25.165 g [Incl foils + Ta wire on 6 packs]

Total mass w/ Target oven=  434 g (w/ end caps)

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

Dimpling direction on foils/ Packs.                                                               --> Center <--

End caps installed (Not expanded). No Ta foil heat shield added

Final desired temperature = 1900C.

Replacement for Nb#10

Thursday, August 24, 2023, 14:16: Roughing.

OMEGA slope = 0.98.

Thursday, August 24, 2023, 14:31: Turbo pump started. 

Thursday, August 24, 2023, 14:41: TGHT / TBHT PS on. Manually test @ 5 / 5 A. ok. Tap back to 0 A. 

Thursday, August 24, 2023, 18:26: Vacuum @ 4.35e-06T. Auto-ramping TGHT / TBHT to 580 / 230 A @ 2 A per minute. 

Thursday, August 24, 2023, 22:00: TGHT / TBHT @ 414 / 230 A (406 / 233 A - Offset). Auto-ramping TGHT to 580 A @ 2 A per min continued. Temperature @ 1353 C. Vacuum @ 4.03e-06T. 

Thursday, August 24, 2023, 23:29: TGHT / TBHT @ 580 / 230 A (569 / 233 A). Auto-ramping TGHT to 610 A @ 2 A per min (approx 600 A w/ offset). Temperature @ 1708 C. Vacuum @ 6.61e-06T. 

Thursday, August 24, 2023, 23:49: TGHT / TBHT @ 610 / 230 A (598 / 233 A). Auto-ramping TGHT to 630 A @ 2 A per min (620 A w/ offset). Temperature @ 1765 C. Vacuum @ 7.22e-06T. 

Friday, August 25, 2023, 00:04: TGHT / TBHT @ 630 / 230 A (618 / 233 A). Auto-ramping TGHT to 650 A @ 2 A per min (640 A w/ offset). Temperature @ 1808 C. Vacuum @ 7.54e-06T. 

Friday, August 25, 2023, 00:16: TGHT / TBHT @ 650 / 230 A (638 / 233 A). Auto-ramping TGHT to 670 A @ 2 A per min (660 A w/ offset). Temperature @ 1845 C. Vacuum @ 7.72e-06T. 

Friday, August 25, 2023, 00:27: TGHT / TBHT @ 670 / 230 A (657 / 233 A). Auto-ramping TGHT to 680 A @ 2 A per min (668 A w/ offset). Temperature @ 1880 C. Vacuum @ 8.46e-06T. 

Manually tap up to temperature.

Friday, August 25, 2023, 00:34: TGHT / TBHT @ 682 / 230 A (669 / 233 A). Temperature @ 1900-1901 C. Vacuum @ 8.59e-06T. Desired Temperature Reached.

Friday, August 25, 2023, 00:37: Auto-cooling @ 2 A per min. 

Friday, August 25, 2023, 06:15: 

Friday, August 25, 2023, 07:40: PS & TP off.

Nb#10 LP-IG-LIS target description:

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

Foil Thickness = 0.025mm (0.001")

Target density =  7.36 g/cm3

Target length = 3.5 cm

Total Mass = 25.7576 g [Incl foils + Ta wire on 6 packs]

Total mass w/ Target oven=  438 g (w/ end caps)

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

Dimpling direction on foils/ Packs.                                                               --> Center <--

End caps installed (Not expanded). No Ta foil heat shield added

Wednesday, June 21, 2023, 10:37: Roughing.

Wednesday, June 21, 2023, 13:39: TP1 on. 

Wednesday, June 21, 2023, 13:55: TGHT / TBHT PS on. Vacuum @ 3.35e-05T

Thursday, June 22, 2023, 13:16: TGHT / TBHT Manually set to 5 / 5 A. Vacuum @ 8.17e-07T.

Final desired temperature = 1900C.

Thursday, June 22, 2023, 13:49: OMEGA slope = 0.98.

Friday, June 23, 2023, 06:24: Auto-ramping TGHT / TBHT to 580 / 230 @ 2 A per min. 

Friday, June 23, 2023, 12:11: TGHT / TBHT @ 580 / 230 A (568 / 233 A). Auto-ramping TGHT to 610 A @ 2 A per min (600 A w/ offset). Temperature @ 1697 C. Vacuum @ 3.38e-06T.

Friday, June 23, 2023, 12:32: TGHT / TBHT @ 610 / 230 A (600 / 233 A). Auto-ramping TGHT to 630 A @ 2 A per min (620 A w/ offset). Temperature @ 1748 C. Vacuum @ 4.61e-06T.

Friday, June 23, 2023, 12:44: TGHT / TBHT @ 630 / 230 A (617 / 233 A). Auto-ramping TGHT to 650 A @ 2 A per min (640 A w/ offset). Temperature @ 1790 C. Vacuum @ 5.74e-06T.

Friday, June 23, 2023, 13:07: TGHT / TBHT @ 650 / 230 A (638 / 233 A). Auto-ramping TGHT to 670 A @ 2 A per min (660 A w/ offset). Temperature @ 1825 C. Vacuum @ 5.90e-06T.

Friday, June 23, 2023, 13:22: TGHT / TBHT @ 670 / 230 A (658 / 233 A). Auto-ramping TGHT to 680 A @ 2 A per min (668 A w/ offset). Temperature @ 1858 C. Vacuum @ 6.75e-06T. 

Friday, June 23, 2023, 13:29: TGHT / TBHT @ 680 / 230 A (667 / 233 A). Auto-ramping TGHT to 690 A @ 2 A per min (677 A w/ offset). Temperature @ 1877 C. Vacuum @ 6.99e-06T. 

Friday, June 23, 2023, 13:37: Manually tap up to temperature. 

Friday, June 23, 2023, 13:38: Vacuum @ 7.54e-06T. TGHT /  TBHT @ 694 / 230 A (680.5 / 233 A direct w/ offset). Temperature @ 1901-1902 C. Desired Temperature Reached.

Friday, June 23, 2023, 13:42: Auto-cooling @ 2 A per min. 

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.

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...

 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.

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

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!

Tuesday, November 22, 2016, 15:53

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

Niobium samples are placed in slots, holding in place, to avoid warping.

Smaller samples closest to MIKRON IR reading [left side]

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

Loaded into evap2 today.

Pumping down now...

 Wednesday, November 23, 2016, 11:45

HS water valves opened, no leaks detected.

Tapped up manually to 35A.

IGP1 = 6.4e-7 Torr

Setting auto-ramp rate at 0.2A/min to max setpoint of 250A.

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

 Wednesday, November 23, 2016, 13:17

IGP1 = 5.9e-7

TGHT = 66A, 0.51V

Vacuum stable.

Increasing ramping rate to 1.0A/min

 Thursday, November 24, 2016, 08:46

IGP1 = 3.9e-7 Torr

TGHT = 250A, 3.41V      *NOTE: the current set reads 243.8A but the readout is 250A

OMEGA = 1013C

MIKRON has no reading yet

Tapping up manually to 1400C

 Thursday, November 24, 2016, 15:42

Samples have remained at ~1400C for 5hrs.

IGP1 = 5.8e-7 Torr

TGHT = 420A, 6.5V

OMEGA = 1410C

MIKRON = 1420C

Initiating auto-cool at 2.0A/min

 Friday, November 25, 2016, 11:39

Vented in air and opened up this morning.

Samples look good!

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. 

 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.