Laura Lambert wrote:

Laura Lambert wrote: Laura Lambert wrote: Laura Lambert wrote: Laura Lambert wrote: Laura Lambert wrote:  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.    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...    Wednesday, July 19, 2017, 14:12 TGHT auto-ramp fixed. Since TBHT isn't hooked up yet, epics thinks TBHT has tripped off. Currently during auto-ramp, every time steps up: states TBHT tripped off. This is not the case but not a big deal as we will soon have TBHT hooked up and this won't be an issue. Also it only states it, doesn't stop auto-ramp and therefore technically works fine/ will go with this for now... Note: Might be a few spikes on striptool from past hour when IOC was rebooted.    Wednesday, July 19, 2017, 14:16 Tapped up manually to 30A yesterday. Continued manual tap up today and reached 60A. Initiated auto-ramp. IG1 = 4.4e-6 Torr    Thursday, July 20, 2017, 14:48 TGHT tripped off yesterday evening  Auto-ramping was fixed but a few more glitches in the system caused the TGHT to trip. Please refer to photos. When auto-ramp is running and vacuum reaches the parameter set for 'Good Vacuum', the auto-ramp should stop until the vacuum drops below the good vacuum at which point it can then continue to auto-ramp. When auto-ramp is running and vacuum reaches the parameter set for 'Bad Vacuum', the auto-ramp should initiate auto-cool/ramp-down until the vacuum drops to the good vacuum parameter at which point it can then proceed with the 'Good Vacuum' requirement. With this scenario, the auto-ramp system ignored the parameters set for good and bad vacuum, proceeded past both points and continued to ramp until the vacuum eventually reached it's trip off vacuum causing the TGHT to trip. The TGHT current was at ~90A when it tripped off, so the target should be OK.    Thursday, July 20, 2017, 15:14 Turns out the auto-ramp was reading the vacuum of 'IGP1' which is what the old ion gauge used to be called for evap1 and is currently one on evap2 AKA attempting to take a vacuum reading from one that doesn't exist for evap1 This ion gauge is now labelled 'IGP' and the auto-ramp system now uses 'IGP' for the vacuum parameter confirmations. Changed a few things in the auto-ramp system: -Updated messages. -Auto-ramp aborts when TGHT/TBHT trips off. -Displays setpoint it is ramping up to for next step -Confirms which ion gauge it is reading -Displays final setpoint and increment on message board -No longer displays TBHT as 'tripped off' when not running. System updated.

Thursday, July 20, 2017, 15:57

Tapped up manually to 35A, 0.45V

IG1 = 5.26e-6 Torr

Re-initiated auto-ramp at 0.1A/min.

 Friday, July 21, 2017, 13:50

TGHT = 81A, 0.92V

IG1 = 5.2e-5 Torr

Vacuum currently yo-yo-ing, but stable.

Changing vacuum limits.

Vacuum limit stop at 1.0e-4 Torr, backing off at 5.0e-4 Torr.

TP = 28.4C, RT = 27.3C

 Thursday, July 27, 2017, 09:02

TGHT = 431A, 4.37V

IG1 = 1.32e-5 Torr

Vacuum stable.

Increasing ramping rate to 0.2A/min

TP = 26.7C, RT = 22.0C

 Friday, July 28, 2017, 09:35

TGHT = 450A, 4.59V

IG1 = 5.4e-6 Torr

Target has remained at max setpoint for 23hrs.

TP = 25.9C, RT = 19.5C

Initiating auto-cool at 1.0A/min

 Friday, August 04, 2017, 13:59

Evap1 was vented in Ar and transferred to the glove box on monday.

A few discs on opened end had slightly shifted [see photo], discs moved back in place - can see down into target.

Discoloration of Ta container to gold in some spots - this is normal as seen with most UCx targets

Target looks good.

Still requires 2nd endcap to be inserted.

 Monday, August 21, 2017, 11:13

Both endcaps in.

No Rh foil inserted.

Endcaps require expanding.