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Entry  Monday, March 09, 2015, 16:50, Laura Lambert, Ta, 38817-5, HP-SIS, In progress, Conditioning Ta target first_ramp_up.JPGsecond_ramp_up_with_Ta_heat_shields.JPG
    Reply  Monday, March 16, 2015, 17:38, John Wong, Ta, 38817-5, HP-SIS, Done, Conditioning Ta target 
Message ID: 184     Entry time: Monday, March 16, 2015, 17:38     In reply to: 183
Author: John Wong 
Target Material: Ta 
Target Oven W.O#: 38817-5 
Source: HP-SIS 
Status: Done 
Subject: Conditioning Ta target 

Laura Lambert wrote:

 Monday, March 09, 2015, 16:47

Target consists of 400 discs.

Total packed length 3.4cm

Total mass 45.8181g

Re foil inserted.

Chamber is currently being pumped down.

No Ta-heat shield wrapped.

One end-cap inserted on left (wrt ionizer into the page)

TGHT and TBHT will be ramped up to 820A/230A respectively at 2.0A/min.


 Tuesday, March 10, 2015, 10:28

HS water valves opened, no leaks detected.

IGP1 = 4.5e-7 Torr.

Power supply not responding to epics...AGAIN. grrrr 


Tuesday, March 10, 2015, 13:17  

IOC was rebooted - back up and running again! yay! 

IGP1 = 4.0e-7 Torr.

Tapped up manually to 35A, waited ~30min, vaccuum stable.

Initiating auto-ramp.

Vacuum limit stop at 5.0e-5 Torr, backing off at 6.0e-5 Torr.


 Wednesday, March 11, 2015, 09:11

Target has been at max setpoints for ~14hrs.

OMEGA = 1472C

TGHT = 820A, 12.85V

TBHT = 230A, 3.696V

IGP1 = 5.5ee-7 Torr

Manually tapping up to obtain hotter internal temperature...


 Wednesday, March 11, 2015, 11:33

Current conditions:

OMEGA = 1565C

TGHT = 900A, 14.3V

TBHT = 230A, 3.7V

IGP1 = 6.3e-7 Torr

Digital pyrometer readings:

Hottest point on left leg, WRT ionizer tube into page = 2400C

Internal temp of container = 1580C

Sat at this temperature ~45min.

Initiating auto-cool at TGHT 2.0A/min, TBHT 1.0A/min

[See attached photo for collected data]


 Thursday, March 12, 2015, 13:12

vented and opened up this morning.

only reached a max internal temp of 1580C.

therefore added 3xTa heat shield and will re-condition at a higher temp.

currently pumping back down.


 Thursday, March 12, 2015, 14:34

IGP1 = 7.0e-7 Torr

stepped up to 35A, waited ~30min, vacuum stable.

IGP1 = 6.1e-7 Torr

Initating ramp-up...


 Friday, March 13, 2015, 07:47

IGP1 = 2.9e-7 Torr

reached max set points for TGHT = 600A, TBHT = 230A

Initiating manual tap-up.


 Friday, March 13, 2015, 10:31

Reached 720A, 1800C at 0850

Will continue to heat for ~3hrs

[see attachment for collected data]


 Friday, March 13, 2015, 12:00

Sat at max temperature, 1800C, for 3 hours.

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


 

 Monday, March 16, 2015, 17:30

Target was removed from Evap#2.  It was successfully conditioned. 

The other end cap was inserted and expended. 

Standard salts were added.   And Re foil is inserted. 

Target is ready for assembly.


 

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