Tests on coil, temperature and the use of silver bolts.

(3) Vented silver bolts on the TBHT and (2) Full silver bolts on the coil

Wednesday, March 21, 2018, 14:10: Roughing.

Wednesday, March 21, 2018, 14:30: Turbo pumps on.

Wednesday, March 21, 2018, 14:35: Ion gauge on.

Wednesday, March 21, 2018, 14:42: RGA on.

Thursday, March 22, 2018, 06:52: Waterlines opened: Vacuum stable @ 3.04e-07T

Thursday, March 22, 2018, 06:53: Power/sources on.

Thursday, March 22, 2018, 06:56: IV4 Opened.

Thursday, March 22, 2018, 07:00: Auto ramping TGHT / TBHT to 580 / 200 A @ 2A per min.

Thursday, March 22, 2018, 07:04 : BIAS / EZL / EE @ 30 / 13 / 1.5 kV .

Thursday, March 22, 2018, 07:05: Optics on.

Thursday, March 22, 2018, 11:32: Out gassing noted. TBHT @ 200 A . TGHT @ 472 A. Ramping rate slowed automatically. Vacuum @ 3.03e-06T.

Thursday, March 22, 2018, 14:42: Out gassing continued. TGHT @ 570A.  Auto ramping TGHT / TBHT to 580 / 250 A @ undefined rate according to vacuum. Vacuum @ 3.03e-06T

Friday, March 23, 2018, 08:11: Auto ramping TBHT from 250 A to 290 A @ 2A per min. TGHT @ 580 A.

Friday, March 23, 2018, 10:20: Anode @ 100V & 8.5mA.

Friday, March 23, 2018, 10:28: Coil @ 50 A

Friday, March 23, 2018, 10:34: Anode @ 200V & 11 mA.

Friday, March 23, 2018, 13:08: RGA froze. Restart RGA

Sunday, March 25, 2018, 20:34 Vacuum stable @ 4.3e-07T . 

Sunday, March 25, 2018, 20:34: TBHT @ 290 A. TGHT @ 580 A.

Sunday, March 25, 2018, 20:34 :  Coil @ 50 A ^ 0.5 V

Sunday, March 25, 2018, 20:34 : Increasing Coil to 60 A

Sunday, March 25, 2018, 20:43: Vacuum seemed to increase to 4.4e-07T. 

Monday, March 26, 2018, 06:45: Optics on. Vacuum stable @ 4.38e-07T

Fernando

Wednesday, March 28, 2018, 08:31: Optics on. Vacuum stable @  3.57e-7T

Wednesday, March 28, 2018, 16:2: After increasing the coil current to to 75, A the coil voltage started to show an oscillating behaviour. (see image ttached)

When increased to 80 A the oscillatory behaviour increases. Reducing the current to 65A and then increasing it to 70 A showed a steady behaviour

Thursday, March 29, 2018, 15:51: Ramping down EZL, BIAS, and TGHT for the long weekend

Tuesday, April 03, 2018, 09:14: Vaccum at 1.77e-7T

Tuesday, April 03, 2018, 09:14 : Auto ramping TGHT / TBHT to 550/ 250A @ 2A per min.

Tuesday, April 03, 2018, 09:18 : BIAS / EZL / EE @ 30 / 13 / 1.5 kV  

Tuesday, April 03, 2018, 09:23 : Optics on

Wednesday, April 04, 2018, 08:39: Ramping TBHT to 290A @ 2A per min. TGHT remains @ 550 A

 Friday, April 6, 2018, afternoon: Due to inconsistencies on EPICS, Carla and I Change the Anode power supply to local in order to monitor the leakage current with a multimeter.

Monday, April 9, 2018, afternoon: TBHT@350A and TGHT@550A 

PS went current limited at AnodeBias=300V and show 3A on the PS Screen, the multimeter read the same.

Ramp down to 0 V 0A on PS. PS shows 0.01V

PS goes to limited current even at 2V.

Tuesday, April 10, 2018, 09:10: Problem persists even at lower TBHG (330A). 

The output cable was removed and the power power supply seemed to behave better. This could mean that there is a short inside the unit, in the past the anode cable had melted into the cup.

Planning to ramp down the TBHT and see if the behaviour remains. If it does, I would ask to remove the unit for inspection.

Tuesday, April 10, 2018, 09:32 : Ramping down TBHTH to 250A

Tuesday, April 10, 2018, 13:07 : Same behaviour. Cooling procedure started to see if the issue is still present, anf if it does remove unit for inspection

Wednesday, April 11, 2018, 06:44: RGA, power/sources confirmed off. IV4 closed. Ion gauge & turbos off.

Wednesday, April 18, 2018, 13:00: Post use comparison of the coil - A.S

1) Used coil from this FEBIAD = 1.999mΩ ***

2) Unused coil A = 2.421mΩ

3) unused coil B = 2.451mΩ