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| Laura Lambert wrote: |
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Wednesday, July 12, 2017, 17:06
Target container was previously coated with TaC and sintered.
Container is wrapped with 3 layers of Ta-heat shield, including the center block
The target consists of 400 discs of UCx with 13.60cm in length [8 packs of 5 + 360 single discs/ 2.6cm on left side, 2.8cm on right side wrt ionizer into page].
Discs in target are arranged as follows: 1pack / 60singles / 1pack / 60singles / 1pack / 60singles / 2packs / 60singles / 1pack / 60singles / 1pack / 60singles / 1pack
A regular TaC coated endcap is inserted left, wrt the ionizer tube pointing down.
The right side is open with a TaC coated spring to help hold materials in.
The chamber is currently pumping down.
TGHT will be ramped up to 450A at 0.1A/min [same current used to reach 1900C in evap2 when sintering TaC coating - elog373 evap2]
Parameter setup: 5.0e-5 good vac, 6.0e-5 bad vac.
Thursday, July 13, 2017, 12:49
Tapped up manually to 35A.
Waited ~2hrs, vacuum stable: IG1 = 2.64e-6 Torr
Initiating auto-ramp.
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Thursday, July 13, 2017, 14:48
Update: auto-ramp not started.
With recent updates to evap1 epics, not everything was uploaded correctly.
TGHT auto-ramp system not working: parameter boxes have white outline indicating locked.
No parameters can be inputed and therefore unable to start auto-ramp.
Friday, July 14, 2017, 15:56
Problems still not fixed.
Have tapped up manually to 50A, 0.59V
Vacuum stable; IG1 = 5.26e-6 Torr.
Will remain at setpoints over weekend before continuing to ramp up manually...
Monday, July 17, 2017, 15:10
New problems:
Paddle wheels for evap2 need replacing asap [see elog evap2 i.d.378]
In order to replace, supply/ return need to be turned off and a full purge; therefore, evap1 must be off otherwise it will trip off from no water.
Evap2 needs to be fixed asap and cannot wait for this process to be complete.
Evap1 had been tapped up manually to 60A.
Tapping down manually to 0A so one can start the paddle wheel replacement work tomorrow.
Tuesday, July 18, 2017, 15:31
Paddle wheels for evap2 replaced and up and running again.
IG1 = 1.2e-6 Torr.
Starting to tap back-up manually...
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