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Message ID: 887     Entry time: Tuesday, July 27, 2021, 12:57
Author: Fernando Maldonado 
Target/No.#:  
Source: LP-FEBIAD 
Station:  
Module:  
Target Oven W.O#: 41790-10 
Heat Shield W.O#: 44378-5 
Status: Failed 
Subject: FEBIAD parameter scan - efficiency measurements 

Assembly has new gas tube to the target for better fit and clearance to the HS.

Electric checks before closing shows no short between TIS and HS.


Tuesday, July 27, 2021, 12:57: Venting

Tuesday, July 27, 2021, 13:28: Turbos on. 

TP1A timed out again! Bypassing BV1A to open it, then reset TP1A and turn  it on.  Turbo show that is at speed right away.

Tuesday, July 27, 2021, 13:38: IG1 on

Tuesday, July 27, 2021, 15:24: IG1 @ 7.07e-6.

Tuesday, July 27, 2021, 15:28: Waterlines open. No vacuum response.

Tuesday, July 27, 2021, 15:33. IV4. Timed out a couple of times.

Tuesday, July 27, 2021, 15:37: Power/Sources on.

 Tuesday, July 27, 2021, 17:57: IG1 @ 2.76e-6 T.

Tuesday, July 27, 2021, 18:04: Auto-ramping TGHT/TBHT to 560/280 A. @ 2A/min. 


Wednesday, July 28, 2021, 00:46: Found out that anode got current limited around 9 pm. I wonder if the tube got moved again

Wednesday, July 28, 2021, 00:48: Auto-cooling to 0 A to investigate. 

 Wednesday, July 28, 2021, 06:44: IV4 closed

Wednesday, July 28, 2021, 06:44: IG1 off. Turbos off. 

Wednesday, July 28, 2021, 08:01: Venting.

 Once more, the tube was touching the heatshield in the same way as before.

  • The cause is likely the spiral line coming from the VCR as in "rest" state in pointing towards the grip handles.
  • I was trying to put an insulator piece and I noticed (and recall) how much force I had to put in order to accommodate the spiral  line in order to align it with the target capillary.
  • This lead me to think that when the targets gets hot and the capillary deforms, this will be pushed towards the HS.
  • To fixed it, I modified the spiral to have less torque or at least make it push to the other side (touching the tbht is no problem).

Closing everything and pumping down.

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