Thursday, March 30, 2023, 12:27: 

Ta#65 LP-SIS target description: 

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

Foil Thickness = 0.033mm (0.0013") avg Measured. 

Target material batch: Ta 2023-1  Mt'l PO# TR-2022-03028

Target density = 18.2685 g/cm3

Target length = 3.40 cm

Total Mass = 62.113 g [Incl foils + Ta wire on 6 packs]

Total mass w/ Target oven= 460.8 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

Tuesday, May 16, 2023, 10:44: End cap removed post conditioning to remove the rhenium foil. End cap replaced, & weight updated. Length remains the same.

Final desired temperature = 1900C.

Thursday, March 30, 2023, 12:41: RP on. 

Thursday, March 30, 2023, 12:42: Roughing 

Thursday, March 30, 2023, 12:44: OMEGA slope = 0.98. 

Thursday, March 30, 2023, 12:59: TP1 on. 

Thursday, March 30, 2023, 13:00: TP1 off.

Thursday, March 30, 2023, 13:03: Venting. (Steel pair of shields req'd - Install)

Thursday, March 30, 2023, 13:05: Roughing.

Thursday, March 30, 2023, 13:20: TP1 on. 

Thursday, March 30, 2023, 13:29: TP1 trip @ 38 krpm. Quick Reset. Fully "green". OK.

Thursday, March 30, 2023, 13:31: Vacuum @ 5.84e-05T. TGHT / TBHT PS on.

Thursday, March 30, 2023, 13:32: Operation Check. TGHT / TBHT tapped up to 5 / 5 A. Ok. Back to 0A. 

Friday, March 31, 2023, 06:32: Auto-ramping TGHT / TBHT to 500 / 200 A @ 2 A per minute. Vacuum @ 6.52e-07T.

Friday, March 31, 2023, 12:08: TGHT / TBHT @ 500 / 200 A. Vacuum @ 2.24e-06T. Temperature @ 1575 C. Auto-ramping TGHT / TBHT to 580 / 230 A @ 2 A per min

Friday, March 31, 2023, 13:05: TGHT / TBHT @ 580 / 230 A. Vacuum @ 3.69e-06T. Temperature @ 1748 C. Auto-ramping TGHT to 600 @ 2 A per min

Friday, March 31, 2023, 13:27: TGHT / TBHT @ 600 / 230 A. Vacuum @ 3.83e-06T. Temperature @ 1790 C. Auto-ramping TGHT to 620 @ 2 A per min

Friday, March 31, 2023, 13:42: TGHT / TBHT @ 620 / 230 A. Vacuum @ 4.34e-06T. Temperature @ 1820 C. Auto-ramping TGHT to 640 @ 2 A per min    

Friday, March 31, 2023, 13:51: TGHT / TBHT @ 640 / 230 A. Vacuum @ 5.51e-06T. Temperature @ 1858 C. Tap up TGHT to 650 A

Friday, March 31, 2023, 13:54: Vacuum @ 6.03e-06T. Temp @ 1902 C. Tapped up TGHT to 660 manually. Desired temperature reached. 

Friday, March 31, 2023, 13:57: Auto-cooling @ 2 A per minute.

Friday, March 31, 2023, 17:31:

Monday, April 03, 2023, 07:35: PS off. TP off. 

 Ta#64 LP-SIS target description: 

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

Foil Thickness = 0.0254mm (0.0010") Measured.

Target density = 12.005 g/cm3

Target length = 3.35 cm

Total Mass = 40.2166 g [Incl foils + Ta wire on 6 packs]

Total mass w/ Target oven= 446 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 expanded). No Ta foil heat shield added

Final desired temperature = 1900C.

Thursday, June 02, 2022, 16:49: Roughing 

Thursday, June 02, 2022, 17:02: OMEGA slope = 0.98. 

Thursday, June 02, 2022, 17:10: TP1 on.

Thursday, June 02, 2022, 17:21: TP1 is up to speed. PS on. 

Friday, June 03, 2022, 05:22: Auto-ramping TGHT / TBHT to 500 / 200 A @ 2 A per min. Vacuum @ 1.78e-06T.

Friday, June 03, 2022, 08:59: TGHT / TBHT @ 424 / 200 A. Vacuum @ 3.42e-06T. Temperature @ 1318 C. Auto ramp ongoing.

Friday, June 03, 2022, 09:40: TGHT / TBHT @ 500 / 200 A. Vacuum @ 4.47e-06T. Temperature @ 1469 C. Auto-ramping TGHT / TBHT to 580 / 230 A @ 2 A per min

Friday, June 03, 2022, 10:47: TGHT / TBHT @ 580 / 230 A. Vacuum @ 6.26e-06T. Temperature @ 1620 C. Auto-ramping TGHT to 600 @ 2 A per min 

Friday, June 03, 2022, 11:08: TGHT / TBHT @ 600 / 230 A. Vacuum @ 6.54e-06T. Temperature @ 1655 C. Auto-ramping TGHT to 630 @ 2 A per min  

Friday, June 03, 2022, 11:30: TGHT / TBHT @ 630 / 230 A. Vacuum @ 7.73e-06T. Temperature @ 1708 C. Auto-ramping TGHT to 650 @ 2 A per min

Friday, June 03, 2022, 11:45: TGHT / TBHT @ 650 / 230 A. Vacuum @ 8.32e-06T. Temperature @ 1748 C. Auto-ramping TGHT to 660 @ 2 A per min

Friday, June 03, 2022, 11:53: TGHT / TBHT @ 660 / 230 A. Vacuum @ 8.83e-06T. Temperature @ 1755 C. Auto-ramping TGHT to 670 @ 2 A per min

Friday, June 03, 2022, 12:05: TGHT / TBHT @ 670 / 230 A. Vacuum @ 9.03e-06T. Temperature @ 1780 C. Auto-ramping TGHT to 680 @ 2 A per min

Friday, June 03, 2022, 12:11: TGHT / TBHT @ 680 / 230 A. Vacuum @ 9.14e-06T. Temperature @ 1795 C. Auto-ramping TGHT to 700 @ 2 A per min 

Friday, June 03, 2022, 12:23: TGHT / TBHT @ 700 / 230 A. Vacuum @ 9.50e-06T. Temperature @ 1822 C. Auto-ramping TGHT to 720 @ 2 A per min

Friday, June 03, 2022, 12:29: TGHT / TBHT @ 720 / 230 A. Vacuum @ 1.00e-05T. Temperature @ 1853 C. Auto-ramping TGHT to 730 @ 2 A per min

Friday, June 03, 2022, 12:36: TGHT / TBHT @ 725 / 230 A. Vacuum @ 1.04e-05T. Temperature @ 1860 C. Manually tap up TGHT to reach desired temperature

Friday, June 03, 2022, 13:04: TGHT / TBHT @ 760 / 230 A. Vacuum @ 1.07e-05T. Temperature @ 1901 C. Desired temperature reached

Friday, June 03, 2022, 13:13: Auto-cooling at 2 A per min. 

Monday, June 06, 2022, 07:07: PS off. BV1 closed & TP1 off.

Monday, June 06, 2022, 08:47: Venting. 

Ta#63 LP-SIS target description: 

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

Foil Thickness = 0.025mm

Target density = 15.38 g/cm3

Target length = 3.4 cm

Total Mass = 52.296 g [Incl foils + Ta wire on 6 packs]

Total mass w/ Target oven= 457 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 expanded). No Ta foil heat shield added

https://elog.triumf.ca/TIS/Target+Production/114

TBHT will be ramped up to 230A 

TGHT will be ramped up to 600A +

Final desired temperature = 1900C.

OMEGA slope = 0.98.

Wednesday, November 10, 2021, 18:05: Roughing. 

Wednesday, November 10, 2021, 18:14: Omega Laser set. On end cap / ok. Slope = 0.980 

Wednesday, November 10, 2021, 18:24: Turbo pump on.

Wednesday, November 10, 2021, 18:25: RV1 valve hissing. Stop TP. Reset, open / close RV1 multiple times. Hissing stopped on its own. Won't affect the pump down, letting pressure out, not in. Will need to replace later.

Wednesday, November 10, 2021, 18:27: Turbo pump on. 

Wednesday, November 10, 2021, 18:32: TP ok. PS on. 

Thursday, November 11, 2021, 11:08: Vacuum @ 4.56e-07T. Auto ramping TGHT / TBHT to 580 / 230 A @ 2A per minute.

Thursday, November 11, 2021, 13:49: TGHT / TBHT @ 313 / 230 A. Vacuum @ 1.46e-06T. Temperature @ 1051 C. Auto ramp continues.

Thursday, November 11, 2021, 16:55: TGHT / TBHT @ 580 / 230 A. Vacuum @ 5.11e-06T. Temperature @ 1621 C. Auto ramp TGHT to 610 A @ 2 A per min.

Thursday, November 11, 2021, 17:13: TGHT / TBHT @ 610 / 230 A. Vacuum @ 6.54e-06T. Temperature @ 1670 C. Auto ramp TGHT to 630 A @ 2 A per min.

Thursday, November 11, 2021, 17:32: TGHT / TBHT @ 630 / 230 A. Vacuum @ 7.82e-06T. Temperature @ 1709 C. Auto ramp TGHT to 650 A @ 2 A per min. 

Thursday, November 11, 2021, 18:49: TGHT / TBHT @ 650 / 230 A. Vacuum @ 7.40e-06T. Temperature @ 1758 C. Auto ramp TGHT to 665 A @ 2 A per min. 

Thursday, November 11, 2021, 19:02: TGHT / TBHT @ 665 / 230 A. Vacuum @ 8.37e-06T. Temperature @ 1790 C. Auto ramp TGHT to 685 A @ 2 A per min. 

Thursday, November 11, 2021, 19:22: TGHT / TBHT @ 685 / 230 A. Vacuum @ 9.56e-06T. Temperature @ 1830 C. Auto ramp TGHT to 700 A @ 2 A per min. 

Thursday, November 11, 2021, 19:41: TGHT / TBHT @ 700 / 230 A. Vacuum @ 1.18e-05T. Temperature @ 1870 C. Manually tap up to 705 A

Thursday, November 11, 2021, 19:43: TGHT / TBHT @ 705 / 230 A. Vacuum @ 1.25e-05T. Temperature @ 1885 C. Manually tap up to 710 A

Thursday, November 11, 2021, 19:44: TGHT / TBHT @ 710 / 230 A. Vacuum @ 1.34e-05T. Temperature @ 1890 C. Manually tap up to 715 A 

Thursday, November 11, 2021, 19:46: TGHT / TBHT @ 715 / 230 A. Vacuum @ 1.75e-05T. Temperature @ 1898 C. Manually tap up to 717 A

Thursday, November 11, 2021, 19:46: TGHT @ 717 A. Temperature @ 1901 C. Temperature reached.

Thursday, November 11, 2021, 19:48: Begin auto-cooling @ 2 A per min.

Friday, November 12, 2021, 06:13: PS off. TP1 off. 

 Ta#62 LP-SIS target description: (REPLACEMENT FOR 44139-10)

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

Foil Thickness = 0.025mm

Target density = 14.29 g/cm3

Target length = 3.4 cm

Total Mass = 48.602 g [Incl foils + Ta wire on 6 packs]

Total mass w/ Target oven= 456 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 expanded). No Ta foil heat shield added

Wednesday, June 23, 2021, 17:46: Roughing.

Wednesday, June 23, 2021, 18:03: TP1 on.

Wednesday, June 23, 2021, 18:09: TP1 @ speed. Vacuum @ 1.53e-04T & dropping.

TBHT will be ramped up to 230A 

TGHT will be ramped up to 600A +

Final desired temperature = 1900C.

OMEGA slope = 0.98.

Thursday, June 24, 2021, 07:38: PS on.  

Thursday, June 24, 2021, 07:45: TGHT / TBHT tapped up to 10 A. Slope @ 0.98

Thursday, June 24, 2021, 07:46: Auto Ramping TGHT / TBHT to 350 / 150 A @ @ A per min.

Thursday, June 24, 2021, 10:47: TGHT / TBHT @ 350 / 150 A. Auto Ramping TGHT / TBHT to 580 / 230 A @ @ A per min. Temp @ 1120 C

Thursday, June 24, 2021, 12:59: TGHT / TBHT @ 580 / 230 A. Vacuum @ 8.24e-06T. Temp @ 1717 C. Auto-ramping TGHT to 600 A @ 2 A per min.   

Thursday, June 24, 2021, 13:10: Vacuum @ 8.83e-06T. Temp @ 1758 C. Auto-ramping TGHT to 620 A @ 2 A per min. 

Thursday, June 24, 2021, 13:21: Vacuum @ 1.0e-05T. Temp @ 1798 C. Auto-ramping TGHT to 645 A @ 2 A per min.  

Thursday, June 24, 2021, 13:37: Vacuum @ 1.15e-05T. Temp @ 1845 C. Tap up TGHT to 650 manually.

Thursday, June 24, 2021, 13:45: Vacuum @ 1.21e-05T. Temp @ 1875 C. Tap up TGHT to 665+ manually.

Thursday, June 24, 2021, 13:47: Vacuum @ 1.34e-05T. Temp @ 1901 C. Tapped up TGHT to 677 manually. Desired temperature reached.

Thursday, June 24, 2021, 13:51: Auto-cooling @ 2A per min 

Friday, June 25, 2021, 05:30: TP1 off. BP1 off.    

Friday, June 25, 2021, 07:36: Venting. 

 Ta#62 LP-SIS target description:

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

Foil Thickness = 0.025mm

Target density = 13.96 g/cm3

Target length = 3.4 cm

Total Mass = 47.461 g [Incl foils + Ta wire on 6 packs]

Total mass w/ Target oven= 445 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 (expanded). No Ta foil heat shield added

TBHT will be ramped up to 230A 

TGHT will be ramped up to 600A +

Final desired temperature = 1900C.

OMEGA slope = 0.98.

Thursday, April 08, 2021, 08:24: Roughing.

Thursday, April 08, 2021, 09:06: Vent & check. Roughed to only 20 T. 

Thursday, April 08, 2021, 09:18: Roughing. Loose flange found. Left side wall / upper right. 

Thursday, April 08, 2021, 09:34: TP1 on. 

Thursday, April 08, 2021, 14:41: Vacuum @ 1.65e-06T. Waterline opened.

Thursday, April 08, 2021, 14:46: Vacuum ok. Power on. TGHT / TBHT to 20 / 15 A. Ok.

Thursday, April 08, 2021, 14:50: Auto-ramping TGHT / TBHT to 300 / 100 A @ 2 A per min.

Friday, April 09, 2021, 05:08: Vacuum @ 6.23e-07T. Temp @ 1195 C. Auto-ramping TGHT / TBHT to 400 / 150 A @ 2 A per min.

Friday, April 09, 2021, 06:01: Vacuum @ 9.64e-07T. Temp @ 1447 C. Auto-ramping TGHT / TBHT to 500 / 200 A @ 2 A per min.

Friday, April 09, 2021, 07:23: Vacuum @ 1.92e-06T. Temp @ 1671 C. Auto-ramping TGHT / TBHT to 600 / 230 A @ 2 / 1 A per min.  

Friday, April 09, 2021, 08:40: Vacuum @ 3.96e-06T. Temp @ 1877 C. Auto-ramping TGHT / TBHT to 620 A @ 1 A per min.   

Friday, April 09, 2021, 09:10: Vacuum @ 3.60e-06T. Temp @ 1915 C. Drop TGHT from 620 A to 610 A manually.

TGHT to 613 A manually.

Friday, April 09, 2021, 09:15: Vacuum @ 3.60e-06T. Temp @ 1902 C. TGHT / TBHT @ 613 A / 230 A. Desired temperature reached.

Friday, April 09, 2021, 12:08: Auto-cooling @ 1 A per min initiated. 

Monday, April 12, 2021, 07:23: PS / Turbo pump / roughing pump off. 

Monday, April 12, 2021, 08:03: Vented. 

Ta#61 LP-SIS target description:

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

Foil Thickness = 0.025mm

Target density =  12.76 g/cm3

Target length = 3.4 cm

Total Mass = 43.388 g [Incl foils + Ta wire on 6 packs]

Total mass w/ Target oven=  464 g (w/ end caps)

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

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

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

TGHT will be ramped up to 600A + at 2.0A/min.

Final desired temperature = 1900C.

OMEGA slope = 0.98.

Tuesday, October 06, 2020, 14:17: Roughing.

Tuesday, October 06, 2020, 14:36: Turbo pump on.

Tuesday, October 06, 2020, 14:43: Turbo pump not spinning up. Holding at 4 krpm. Will need to vent and Troubleshoot in the am.  

Attempted to run the turbo pump again. Only runs to 4 krpm. Shut down to avoid trip. Vent & remove Flex-line HS. Change all the SS gaskets. Re-install Flex-line HS w/ Ta#61.

Wednesday, October 07, 2020, 09:16: Roughing. 

Wednesday, October 07, 2020, 09:32: Turbo pump on. 

Wednesday, October 07, 2020, 10:05: Multiple attempts made to spin up the turbo pump. TP1 holds at 4 krpm, occasionally to 5 krpm, times out & trips. 

Wednesday, October 07, 2020, 10:08: Shut off TP1 & backing pump. 

Replaced TP1. https://elog.triumf.ca/TIS/Evaporator_2/514

Wednesday, October 07, 2020, 13:45: TP1 off. Soft start function off. Remote start configuration initiated. TP1 on @ 38krpm. OK. 

Wednesday, October 07, 2020, 13:47: Vacuum @ 1.31e-05T.

Wednesday, October 07, 2020, 13:49: Waterlines opened. Vacuum ok @ 1.27e-05T.

Wednesday, October 07, 2020, 13:50: PS switched on. 

Wednesday, October 07, 2020, 15:24: Slope set @ 0.98. Vacuum @ 3.30e-06T.

Wednesday, October 07, 2020, 15:26: TGHT / TBHT on. Manually tap up to 10 / 10 A.

Wednesday, October 07, 2020, 15:28: Auto-ramping TGHT / TBHT to 300 / 150 A @ 2 / 1 A per min. 

Thursday, October 08, 2020, 05:23: Vacuum @ 7.00e-07T. 

Thursday, October 08, 2020, 05:25: Auto-ramping TGHT / TBHT to 450 / 200 A @ 2 / 1 A per min. Temp @ 996 C

Thursday, October 08, 2020, 06:44: Auto-ramping TGHT / TBHT to 550 / 230 A @ 2 / 1 A per min. Temp @ 1426 C

Thursday, October 08, 2020, 07:43: Vacuum @ 3.88e-06T. Temp @ 1685 C. 

Thursday, October 08, 2020, 07:45: Auto-ramping TGHT to 600 A @ 2 A per min.

Thursday, October 08, 2020, 08:42: Auto-ramping TGHT to 630 A @ 2 A per min. Vacuum @ 4.01e-06T. Temp @ 1800 C. 

Thursday, October 08, 2020, 09:07: Auto-ramping TGHT to 645 A @ 2 A per min. Vacuum @ 4.91e-06T. Temp @ 1851 C.  

Thursday, October 08, 2020, 09:19: Auto-ramping TGHT to 655 A @ 2 A per min. Vacuum @ 5.37e-06T. Temp @ 1879 C.   

Thursday, October 08, 2020, 09:28: TGHT @ 650-657 A. Vacuum @ 5.70e-06T. Temp @ 1901 C. Desired temperature reached*

Thursday, October 08, 2020, 09:59: TGHT @ 650-657 A. Vacuum @ 4.64e-06T. Temp @ 1903 C.

Thursday, October 08, 2020, 10:01:  Auto-cooling TGHT / TBHT @ -3 / -2 A per min. 

Thursday, October 08, 2020, 13:57: TP1 / PS off.

Thursday, October 08, 2020, 14:08: Venting. 

Thursday, October 08, 2020, 14:15: Flex-Line HS removed w/ Ta#61. 

 Ta#59 LP-SIS target description:

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

Foil Thickness = 0.025mm

Target density =  13.74 g/cm3

Target length = 3.4 cm

Total Mass =  46.7314 g [Incl foils + Ta wire on 6 packs]

Total mass w/ Target oven=  436 g (440 g w/ end caps)

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

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

Monday, September 16, 2019, 14:47: Roughing. 

Monday, September 16, 2019, 14:55: Turbo pump on. 

Monday, September 16, 2019, 15:04: Timed out. Open RV1

Monday, September 16, 2019, 15:05: Restart Turbo pump.

Monday, September 16, 2019, 15:14: Attempt stop / restart before timeout. 

Monday, September 16, 2019, 15:21: Turbo pump unable to pass 4krpm. Close for re-attempt tomorrow am.

Tuesday, September 17, 2019, 12:33: Venting. Sort out pump down issues.

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

TGHT will be ramped up to 650A at 2.0A/min.

Final desired temperature = 1900C.

OMEGA slope = 0.98.

Wednesday, September 18, 2019, 08:50: Omega slope set to 0.98. Power supplies / sources on. vacuum@ 3.34e-05T & dropping. 

Wednesday, September 18, 2019, 08:25: Roughing.

Wednesday, September 18, 2019, 08:34: Turbo pump on. 

Wednesday, September 18, 2019, 10:22: TGHT manually to 40A. Vacuum @ 3.18e-06T.

Wednesday, September 18, 2019, 10:25: Auto-ramping TGHT / TBHT @ 2 / 1 A per min to 350 / 180 A. 

Wednesday, September 18, 2019, 13:43: Vacuum @ 2.30e-06T. Temp @ 1120 deg C. TGHT / TBHT @ 350 / 180 A. 

Wednesday, September 18, 2019, 13:45: Auto-ramping TGHT / TBHT @ 2 / 1 A per min to 550 / 215 A.  

Thursday, September 19, 2019, 06:39: Vacuum @ 8.79e-07T. Temp @ 1722 deg C. TGHT / TBHT @ 550 / 215 A.  

Thursday, September 19, 2019, 06:42: Auto-ramping TGHT / TBHT @ 2 / 1 A per min to 600 / 230 A.   

Thursday, September 19, 2019, 08:18: Auto-ramping TGHT to 630A @ 2 A per min

Step up to desired temp

Thursday, September 19, 2019, 08:49: Vacuum @ 3.22e-06T. TGHT / TBHT 645 (642.7) / 230 (233.44) A. TGHT Voltage= 12.501V. Omega: 1902-1903 deg C. Desired temperature = 1900C reached. 

Thursday, September 19, 2019, 14:17: Vacuum @ 1.45e-06T. Begin auto-cooling TGHT / TBHT @ -1 / -1 A per min. 

Friday, September 20, 2019, 07:59: Turbo pump off. PS / Sources off. 

Friday, September 20, 2019, 08:42: Venting. 

Ta#58 LP-SIS target description:

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

Foil Thickness = 0.025mm

Target density =  14.16 g/cm3

Target length = 3.4 cm

Total Mass =  48.138 g [Incl foils + Ta wire on 6 packs]

Total mass w/ Target oven=  464 g

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

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

Tuesday, April 23, 2019, 13:54: Roughing. 

Tuesday, April 23, 2019, 14:01: Turbo pump started. 

Tuesday, April 23, 2019, 14:09: Turbo pump at speed. 

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

TGHT will be ramped up to 650A at 2.0A/min.

Final desired temperature = 1900C.

OMEGA slope = 0.98.

Wednesday, April 24, 2019, 08:38: Power / sources on. 

Wednesday, April 24, 2019, 08:43: TGHT manually to 40A. Vacuum @ 1.87e-07T.

Wednesday, April 24, 2019, 08:45: Auto-ramping TGHT / TBHT @ 2 / 1 A per min to 350 / 180 A. 

Slope found / set. Slope = 0.98. Laser on target, OK.

Wednesday, April 24, 2019, 11:58: Vacuum @ 4.45e-07T. Temp @ 1120 deg C. TGHT / TBHT @ 350 / 180 A.

Wednesday, April 24, 2019, 12:02: Auto-ramping TGHT / TBHT @ 2 / 1 A per min to 650 / 230 A.   

Wednesday, April 24, 2019, 14:27: Halted auto ramping briefly. Set auto-ramping TGHT @ 2 A per min to 630 A .

Wednesday, April 24, 2019, 14:32:  TGHT / TBHT @ 630 (627.9) / 230 (233.3) A.

Vacuum @ 1.15e-06T. Temp @ 1840 deg C. Hold.

Thursday, April 25, 2019, 06:59: Vacuum @ 2.74e-07T. Temp @ 1860 deg C. Hold. 

Thursday, April 25, 2019, 08:05: Auto-ramping TGHT @ 2 A per min to 640 A.

Thursday, April 25, 2019, 08:13: TGHT / TBHT @ 640 (636.9) / 230 (233.16) A.

Vacuum @ 9.96e-07T. Temp @ 1878 deg C.

Thursday, April 25, 2019, 08:15: Auto-ramping TGHT @ 2 A per min to 645 A.  

Thursday, April 25, 2019, 08:20: Auto-ramping TGHT @ 2 A per min to 650 A.   

Thursday, April 25, 2019, 08:24: Vacuum @ 9.96e-07T. TGHT / TBHT 653 (650.3) / 230 (233.16) A. TGHT Voltage= 12.760V. Omega: 1902-1903 deg C. Desired temperature = 1900C reached. 

Thursday, April 25, 2019, 14:00: Begin auto-cooling TGHT / TBHT @ -2 / -1 A per min.

Friday, April 26, 2019, 10:29: Power/heaters off. Turbo pumps off. 

Friday, April 26, 2019, 10:42: Venting. 

 Tuesday, April 17, 2018, 10:20

Target consists of 470 discs.

Total packed length 3.4cm [exactly 7.8cm space on both sides]

Total mass g [Incl foils + Ta wire on 6 packs]

Target consists of 350 single discs and 6x20 packs of Ta discs

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

No Heat shields.

No endcaps inserted, no Rh foil inserted.

Chamber pumped down over night.

TGHT will be ramped up to 300A at 1.0A/min.

Aurelia will take over for temp measurements.

Final desired temperature = 1900C

Vacuum limit stop at 3.0e-5 Torr, backing off at 8.0e-5 Torr.

 Thursday, April 19, 2018, 08:39

First round of temperature measurements complete.

Reached a max current of 600A, ~1700C

Cooled down overnight.

Will remove from evap2, insert endcaps, and load back in for more measurements.

 Thursday, April 19, 2018, 12:35

Vented in air and removed from evap2.

See next elog for follow up temperature measurements.

 Ta#56 HP-SIS target description:

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

Foil Thickness = 0.025mm

Target density = 14.01 g/cm3

Target length = 3.4 cm

Total Mass = 47.374 g [Incl foils + Ta wire on 6 packs]

Total mass w/ Target oven= 1469 g

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

Thursday, June 21, 2018, 11:430: Ta#56 loaded into Evap 2 

Thursday, June 21, 2018, 11:37: Roughing

Thursday, June 21, 2018, 11:48 : Turbo pump started.

Thursday, June 21, 2018, 11:56 : Turbo pump at speed

Monday, June 25, 2018, 08:00: Vacuum @ 3.35e-07T

Monday, June 25, 2018, 08:05: TGHT/TBHT Power supplies switched on.

Monday, June 25, 2018, 09:35: Vacuum @ 3.23e-07T. Manually bump up TGHT to 40A.

Slope found / set.

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

TGHT will be ramped up to 650A at 2.0A/min.

Final desired temperature = 1900C

OMEGA slope = 0.98

Monday, June 25, 2018, 11:41: Auto-ramping TGHT / TBHT @ 2 / 1 A per min to 300 / 180 A 

Monday, June 25, 2018, 13:28: Check: Vacuum @ 1.08e-06T. TGHT / TBHT @ 248 / 110 A

Monday, June 25, 2018, 13:50: TGHT ramping halted momentarily. Limit increased to 350 A, continue ramping.

Monday, June 25, 2018, 14:44: Check: Vacuum @ 1.08e-06T. TGHT / TBHT @ 350 / 180 A. (hold till am)

Omega: 1033 deg C

Tuesday, June 26, 2018, 08:37: Vacuum @ 3.03e-07T. Auto-ramping TGHT / TBHT @ 2 / 1 A per min to 600 / 230 A . Omega: 1010 deg C (approx)

Tuesday, June 26, 2018, 11:25: Vacuum @ 1.34e-06T. TGHT / TBHT @ 248 / 110 A. Omega: 1605 deg C (approx) 

Auto-ramping TGHT  @ 2 A per min to 650 A

Tuesday, June 26, 2018, 12:06: Limited at 608A ? Display still ramping past the auto-ramp limit. 

Tuesday, June 26, 2018, 12:24 : Auto ramp halted. Display brought to 610 A. Readback 603 A

Tuesday, June 26, 2018, 12:41: Voltage limit adjusted to 12.00V. Mnaualy increased TGHT to 620 A. Auto-ramping TGHT  @ 2 A per min to 650 A

Tuesday, June 26, 2018, 12:59: Check: Vacuum @ 1.53e-06T. TGHT / TBHT @ 650 / 230 A. 

Omega: 1747 deg C

Tuesday, June 26, 2018, 15:07: Check: Vacuum @ 9.73e-07T. TGHT / TBHT @ 650 / 230 A. (hold till am)

Omega: 1760 deg C

Wednesday, June 27, 2018, 07:49: Check: Vacuum @ 5.06e-07T. TGHT / TBHT @ 650 / 230 A.

Omega: 1796 deg C. Begin auto-ramping TGHT to 700 A @ 2 A per min with pause at 675 A. Monitor.

Wednesday, June 27, 2018, 08:00: Check: Vacuum @ 5.80e-07T. TGHT / TBHT @ 675 / 230 A.

Omega: 1843 deg C. Begin auto-ramping TGHT to 700 A @ 2 A per min. Monitor.

Wednesday, June 27, 2018, 08:16: Vacuum @ 7.45e-07T. TGHT / TBHT @ 700 / 230 A. Omega: 1890 deg C (approx). 

Wednesday, June 27, 2018, 08:23: Vacuum @ 8.53e-07T. TGHT / TBHT @ 707 / 230 A. TGHT Voltage= 10.783V. Omega: 1906-1913 deg C. Desired temperature = 1900C reached.

Wednesday, June 27, 2018, 13:11: Vacuum @ 6.77e-07T. Omega: 1902-1915 deg C

Wednesday, June 27, 2018, 14:53: Begin auto-cooling TGHT / TBHT @ - 2 / -1 A per min overnight. 

Thursday, June 28, 2018, 07:39: Power supplies off. Turbo pump off.  

Thursday, June 28, 2018, 09:38: Vented. Remove From Evap 2.

 Friday, September 15, 2017, 09:44

Target consists of 470 discs.

Total packed length 3.4cm [exactly 7.8cm space on both sides]

Total mass g [Incl foils + Ta wire on 6 packs]

Target consists of 350 single discs and 6x20 packs of Ta discs

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

1 long Ta Heat shield on each side, not incl center block.

No endcaps inserted, no Rh foil inserted.

Loaded into evap2 yesterday.

Chamber pumped down overnight.

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

TGHT will be ramped up to 650A at 2.0A/min.

Final desired temperature = 1900C

OMEGA slope = 0.98

HS water valves were already open.

Tapped up manually to 40A, vacuum stable.

IGP1 = 1.1e-6 Torr

IGP2 = 7.8e-7 Torr

Initiating auto-ramp.

Vacuum limit stop at 3.0e-5 Torr, backing off at 4.0e-5 Torr.

 Monday, September 18, 2017, 08:38

TGHT = 647A, 10.04V

TBHT = 233A, 3.51V

IGP1 = 4.65e-7 Torr

IGP2 = 3.78e-7 Torr

OMEGA = 1700C

Increasing max setpoint of TGHT to 750A

 Monday, September 18, 2017, 14:49

TGHT = 760A, 11.96V

TBHT = 233A, 3.54V

IGP1 = 8.9e-7 Torr

IGP2 = 8.6e-7 Torr

OMEGA = 1905C

Conditioning process complete.

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

 Tuesday, September 19, 2017, 10:38

Target was cooled down in sections so Yasser could take some temperature measurements with his thermocouples.

Vented in air and removed from evap2 this morning.

Target looks good.

Endcaps inserted and expanded.

Inserting Rh foil this afternoon.

 Tuesday, September 26, 2017, 10:53

Tapped up manually to 230A over the course of ~35min.

TBHT striptool = 228A, 0.33V

TBHT direct readout = 230.4A, 0.33V

Vacuum good/ stable.

Minor spike to IGP1 = 1.5e-5 Torr ~5min after reached max setpoint of 230A.

IGP1 striptool = 3e-6 Torr

IGP1 direct readout = 3.79e-6 mBar

Initiating auto-cool at 2.0A/min.

 Tuesday, June 20, 2017, 15:58

Target consists of 470 discs.

Total packed length 3.4cm [exactly 7.8cm space on both sides]

Total mass 50.3105g [Incl foils + Ta wire on 6 packs]

Target consists of 350 single discs and 6x20 packs of Ta discs

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

1 long Ta Heat shield.

No endcaps inserted, no Rh foil inserted.

Chamber currently pumping down.

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

TGHT will be ramped up to 600A at 2.0A/min.

Final desired temperature = 1900C

OMEGA slope = 0.98

Vacuum limit stop at 3.0e-5 Torr, backing off at 4.0e-5 Torr.

*Note: container accidentally engraved with WO#412218-6 when it should be WO#42218-6

Wednesday, June 21, 2017, 10:05 

HS water valves opened, no leaks detected.

Tapped up manually to 40A, vacuum stable.

IGP1 = 5.53e-7 Torr

IGP2 = 4.35e-7 Torr

Initiating auto-ramp.

 Wednesday, June 21, 2017, 14:48

TGHT stopped at 575A due to voltage limit sitting at 9V

Increased max setpoint of voltage to 14V.

Re-started auto-ramp starting at 575A.

Wednesday, June 21, 2017, 15:23  

TGHT = 600A, 8.95V

TBHT = 230A, 3.72V

IGP1 = 1.55e-6 Torr

IGP2 = 1.62e-6 Torr

OMEGA = 1538C

Increasing max setpoint of TGHT to 700A

 Wednesday, June 21, 2017, 16:21

TGHT = 700A, 10.57V

TBHT = 230A, 3.75V

IGP1 = 2.2e-6 Torr

IGP2 = 2.4e-6 Torr

OMEGA = 1730C

Increasing max setpoint of TGHT to 750A

 Friday, June 23, 2017, 15:41

TGHT = 780A, 11.77V

TBHT = 230A, 3.77V

IGP1 = 4.8e-7 Torr

IGP2 = 4.8e-7 Torr

OMEGA = 1890C

Conditioning process complete.

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

 Monday, June 26, 2017, 10:51

Target vented in air and removed from evap2 today.

Endcaps inserted.

Target looks good!

 Tuesday, May 30, 2017, 14:36

Target consists of 400 discs.

Total packed length 2.9cm [exactly 8.05cm space on both sides]

Total mass 42.8228g [Incl foils + Ta wire on 4 packs]

Target consists of 320 single discs and 4x20 packs of Ta discs

Discs in target are arranged as follows: 80singles / 1pack / 80singles / 2packs / 80singles / 1pack / 80singles

3x Ta Heat shields.

No endcaps inserted, no Rh foil inserted.

Chamber currently pumping down.

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

TGHT will be ramped up to 350A at 2.0A/min.

Final desired temperature = 1900C

OMEGA slope = 0.98

Windows cleaned.

Vacuum limit stop at 3.0e-5 Torr, backing off at 4.0e-5 Torr.

 Wednesday, May 31, 2017, 09:47

HS water valves opened, no leaks detected.

Tapped up manually to 35A.

Vacuum stable.

IGP1 = 4.58e-7 Torr

IGP2 = 3.68e-7 Torr

Initiating auto ramp.

 Wednesday, May 31, 2017, 14:07

IGP1 = 1.11e-6 Torr

IGP2 = 1.13e-6 Torr

TGHT = 354A, 5.45V

TBHT =233A, 4.01V

OMEGA = 1565C

Increasing max setpoint to 400A at same ramping rate.

 Wednesday, May 31, 2017, 14:41

IGP1 = 1.19e-6 Torr

IGP2 = 1.24e-6 Torr

TGHT = 401A, 6.37V

OMEGA = 1708C

Increasing max setpoint to 425A at same ramping rate.

Wednesday, May 31, 2017, 15:51

Tapped up to ~1900C

TGHT = 480A, 7.85V

TBHT = 230A, 4.06V

OMEGA = 1912C

IGP1 = 1.85e-6 Torr

IGP2 = 2.06e-6 Torr

Will remain at max setpoints for a couple days before cooling

 Friday, June 02, 2017, 13:19

Remained at max setpoint for 2days

TGHT = 480A, 7.85V

TBHT = 230A, 4.06V

OMEGA = 1885C

IGP1 = 2.15e-7 Torr

IGP2 = 2.07e-7 Torr

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

 Monday, June 05, 2017, 15:18

Vented in air and taken out this morning.

Target looks good 

 Wednesday, June 07, 2017, 15:41

Endcaps inserted.

Ta heat shield removed.

Rh foil inserted.

Handed off to assembly.

Target container wrapped in 3x heat shield foils and installed by JW

 Monday, March 13, 2017, 15:33: Opened water for HS. Vacuum stable at IG1 1E-6 T 

Monday, March 13, 2017, 15:48: TGHT / TBHT to 30 / 15 A.

Monday, March 13, 2017, 15:54: Started auto-ramping to TGHT / TBHT 150 / 75 A at 1 / 0.5 A/min. Good/bad vacuum 3 / 4 E-5 Torr

Tuesday, March 14, 2017, 08:23: Continue auto-ramping to TGHT / TBHT 300 / 150 A. Vacuum stable at IG1 2.3E-7 T 

Tuesday, March 14, 2017, 11:18: Continue auto-ramping to TGHT / TBHT 350 / 200 A. Vacuum stable at IG1 3.8E-7 T 

Wednesday, March 15, 2017, 08:31: Continue auto-ramping to TGHT 375. Vacuum stable at IG1 2.5E-7 T. Omega at 1500 C

Wednesday, March 15, 2017, 16:34: Continue auto-ramping to TGHT 500. Vacuum increased to IG1 5.5E-7 T. Omega at 1887 C

Thursday, March 16, 2017, 08:34: Continue auto-ramping to TGHT 520. Vacuum increased to IG1 3.3E-7 T. Omega at 1888 C

Thursday, March 16, 2017, 08:48: TGHT at 521 A 8.99 V. Omega at 1899 C

Friday, March 17, 2017, 08:25: TGHT at 521 A 8.88 V. Omega at 1886 C. Vacuum IG1 2.5E-7 Torr

Ramping down

Wednesday, March 22, 2017, 08:42: Turbo pump stopped

Friday, October 07, 2016, 16:40

Target consists of 470 discs.

Total packed length 3.4cm [exactly 7.8cm space on both sides]

Total mass 47.6889g [Incl foils + Ta wire on 6 packs]

Note: Target consists of 350 single discs and 6x20 packs of Ta discs

3x Ta Heat shields.

No endcaps inserted, no Rh foil inserted.

Chamber currently pumping down.

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

TGHT will be ramped up to 300A at 2.0A/min.

Final desired temperature = 1900C

 Wednesday, October 12, 2016, 16:15

Tapped up to 1900C? [see attached link for data concerning temperature readings]

TGHT = 450A, 7.16V

TBHT = 230A, 4.1V

OMEGA = 1748C

IGP1 = 6.1e-7 Torr

Laura Lambert wrote:

Friday, October 07, 2016, 16:40 Target consists of 470 discs. Total packed length 3.4cm [exactly 7.8cm space on both sides] Total mass g [Incl foils + Ta wire on 6 packs] Note: Target consists of 350 single discs and 6x20 packs of Ta discs 3x Ta Heat shields. No endcaps inserted, no Rh foil inserted. Chamber currently pumping down. TBHT will be ramped up to 230A at 1.0A/min. TGHT will be ramped up to 300A at 2.0A/min. Final desired temperature = 1900C  Tuesday, October 11, 2016, 10:02   HS water valves opened, no leaks detected   Tapped up manually to 35A   Vacuum stable, IGP1 = 2e-7 Torr   Initiating auto-ramp.   OMEGA slope = 0.98  Wednesday, October 12, 2016, 16:15 Tapped up to 1900C? [see attached link for data concerning temperature readings] TGHT = 450A, 7.16V TBHT = 230A, 4.1V OMEGA = 1748C IGP1 = 6.1e-7 Torr

 Wednesday, October 12, 2016, 21:14

Current status before cooling down:

TGHT at 450A/7.32V; TBHT at 230A/4.10V; OMEGA at 1747C

Vacuum at 4.05 e-7 Torr.

Initiate auto-rampping at 2A/min for TGHT and 1A/min for TBHT

John Wong wrote:

Laura Lambert wrote: Friday, October 07, 2016, 16:40 Target consists of 470 discs. Total packed length 3.4cm [exactly 7.8cm space on both sides] Total mass g [Incl foils + Ta wire on 6 packs] Note: Target consists of 350 single discs and 6x20 packs of Ta discs 3x Ta Heat shields. No endcaps inserted, no Rh foil inserted. Chamber currently pumping down. TBHT will be ramped up to 230A at 1.0A/min. TGHT will be ramped up to 300A at 2.0A/min. Final desired temperature = 1900C  Tuesday, October 11, 2016, 10:02   HS water valves opened, no leaks detected   Tapped up manually to 35A   Vacuum stable, IGP1 = 2e-7 Torr   Initiating auto-ramp.   OMEGA slope = 0.98  Wednesday, October 12, 2016, 16:15 Tapped up to 1900C? [see attached link for data concerning temperature readings] TGHT = 450A, 7.16V TBHT = 230A, 4.1V OMEGA = 1748C IGP1 = 6.1e-7 Torr    Wednesday, October 12, 2016, 21:14 Current status before cooling down: TGHT at 450A/7.32V; TBHT at 230A/4.10V; OMEGA at 1747C Vacuum at 4.05 e-7 Torr. Initiate auto-rampping at 2A/min for TGHT and 1A/min for TBHT

 Thursday, October 13, 2016, 17:32

vented in air and opened up this morning.

target looks good.

 Tuesday, July 26, 2016, 16:50

loaded into evap2

pumped down, HS water valves opened, no leaks detected.

tapped up manually to 35A

vacuum stable = 3.8e-6 Torr

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

Final setpoints at 230A for the TBHT and 600A for the TGHT.

Final desired temperature = 1800C

 Wednesday, July 27, 2016, 09:20

IGP1 = 6.3e-7 Torr, vacuum stable.

TGHT = 232A, 2.7V

TBHT = 131A, 1.76V

Increasing ramping rate to 1.0A/min and 0.5A/min for the TGHT and TBHT respectively.

 Wednesday, July 27, 2016, 15:46

TGHT = 600A, 8.87V

TBHT = 230A, 3.7V

IGP1 = 1.37e-6 Torr

OMEGA = 1640C

Increased max TGHT voltage to 12V

Tapped up manually to OMEGA = 1810C

TGHT = 675A, 10.21V

IGP1 = 2.2e-6 Torr

Will remain at max setpoints for the rest of the week and cool down over weekend.

 Thursday, July 28, 2016, 08:34

TGHT = 675A, 10.41V

OMEGA = 1833C

Tapped down to 660A, 10.09V

OMEGA = 1805C

 Friday, July 29, 2016, 13:57

OMEGA = 1814C

TGHT = 660A, 10.16V

TBHT = 230A, 3.72V

IGP1 = 3.43e-7 Torr

evap2 has remained at max setpoints for ~42hrs

conditioning complete.

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

 Tuesday, August 02, 2016, 13:39

vented in air and removed from evap2 this morning.

target looks good!

Tuesday, August 18, 2015, 15:53

Target consists of 505 discs.

Total packed length 3.4cm.

Total mass 75.2772g.

Re foil inserted.

3x Ta Heat shields.

No endcaps inserted.

Chamber currently pumping down.

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 184]

*Note: Turbo Pump is on low speed

 Wednesday, August 19, 2015, 10:15

IGP1 = 8.3e-7 Torr.

Tapped up manually to 35A.

Initiating auto-ramp.

Wednesday, August 19, 2015, 15:55  

IGP1 = 3.3e-6 Torr.

TBHT reached max setpoint of 230A

TGHT reached max setpoint of 600A

OMEGA = 1554C

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

Laura Lambert wrote:

Tuesday, August 18, 2015, 15:53 Target consists of 505 discs. Total packed length 3.4cm. Total mass 75.2772g. Re foil inserted. 3x Ta Heat shields. No endcaps inserted. Chamber currently pumping down. 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 184] *Note: Turbo Pump is on low speed  Wednesday, August 19, 2015, 10:15 IGP1 = 8.3e-7 Torr. Tapped up manually to 35A. Initiating auto-ramp. Wednesday, August 19, 2015, 15:55   IGP1 = 3.3e-6 Torr. TBHT reached max setpoint of 230A TGHT reached max setpoint of 600A OMEGA = 1554C Increasing final setpoint of TGHT to 700A and re-initiating auto-ramp.

 Wednesday, August 19, 2015, 17:13

TGHT reached to 700A/10.5V, direct voltage at 5.2V, and temp measured at both ends at 1755C.  Vac is coming down from 4.2e-6 Torr. 

Stepping up TGHT to reach 1800C

Wednesday, August 19, 2015, 17:22

Increased TGHT to 722A/11.3V (direct voltage at 5.48V) to reach 1800C (consistant with the heating curve as for the previous HPTa target, elog 184)

Will continue to condition the target at this temperature for overnight. 

Cooling down can be initiated tomorrow morning at 2A/min --- Please measure the target temperature from the new window port before cooling it down.