2 C-Seals installed with SS springs on water blocks. The SS springs are also used in the module.

Long pkg seal (A):

T: 0.098" x 0.429" Diameter.

Installed on line FS#5 , Block L, Heat shield cooling block. (Top seal, bottom seal of 2 is still the rubber O-ring)

Short pkg seal (B):

T: 0.095"  x 0.424" Diameter.

Installed on line FS#3 , Block G, Coil cooling block.

All the waterlines are purged and shut. Open individually and monitor for leaks.

Tuesday, May 08, 2018, 10:27: Roughing

Tuesday, May 08, 2018, 10:31: Both BV1A & BV1B are open.

Tuesday, May 08, 2018, 10:57: Turbo Pumps started.

Tuesday, May 08, 2018, 11:03: Ion gauge on.

Tuesday, May 08, 2018, 11:15: RGA started.

Tuesday, May 08, 2018, 13:30: Vacuum @ 3.14e-06T

Wednesday, May 09, 2018, 06:48: Vacuum 5.13E-07T. RGA ok. 

Wednesday, May 09, 2018, 06:50: Hook up Leak Detector. Leak detector # 5 (DRY) from Vacuum Group. Startup

Baseline Reading:

TP pressure 0.0e-04

Leak rate: Below 0.0e-09 atm-cc/sec

Valve to chamber opened. LD connection clear.

LD: 1.3e-08 atm-cc/sec

He TEST:

Wednesday, May 09, 2018, 07:00: Purge both lines with He. Do not pressurize.

Vacuum @ 5.13e-07T. RGA status:

Water @ 3.22e-007

He:-1.93e-009

LD: 1.3e-08 atm-cc/sec

Wednesday, May 09, 2018, 07:15: Open line FS#5 to heat shield. Pressurize to 30 PSI.

Wednesday, May 09, 2018, 07:40: Vacuum @ 5.02e-07T. RGA status:

Water @ 3.13e-007

He:-1.67e-009

LD: 9.3e-08 atm-cc/sec. Purge and close FS#5.

Wednesday, May 09, 2018, 07:45: Open line FS#3 to Coil block. Pressurize to 30 PSI.

08:10: Vacuum @ 4.9e-07T. RGA status:

Water @ 3.08e-007

He:-1.61e-009

LD: 1.5e-07 atm-cc/sec

Wednesday, May 09, 2018, 08:15: Depressurize lines. Connect HPA. 

Wednesday, May 09, 2018, 08:20: Vacuum @ 4.76e-07T. RGA status:

Water @ 3.05e-007

He:-1.68e-009

LD: 1.7e-07 atm-cc/sec

08:25: LD: 1.7e-07 atm-cc/sec. Close Valve & disconnect LD

Water & Cycling TEST:

Wednesday, May 09, 2018, 08:45: Vacuum @ 4.67e-07T. RGA status:

Water: 3.02e-007

Open lines FS#2 and FS#4

Wednesday, May 09, 2018, 08:55: Vacuum @ 4.65e-07T. RGA status: Water @ 2.97e-007

Close lines FS#2 and FS#4. Water filled.

Open line FS#5 to heat shield.  Vacuum and RGA ok.

09:00: Begin C-Seal (A) shock cycling. 20 cycles @ 5 min apart.

Close Supply/Return, Open Supply/Return to 'Shock'

Wednesday, May 09, 2018, 10:40: Close line FS#5. Vacuum @ 4.49e-07T. RGA status: Water @ 2.84e-007

Open line FS#3 to Coil block.  Vacuum and RGA ok

10:45: Begin C-Seal (B) shock cycling. 20 cycles @ 5 min apart

Close Supply/Return, Open Supply/Return to 'Shock'

12:25: Open FS#5 and leave FS#3 open. Status Vacuum @ 4.32e-07T . RGA status: Water @ 2.70e-007

13:00: Status Vacuum @ 4.30e-07T . RGA status: Water @ 2.67e-007

Wednesday, May 09, 2018, 14:24: Status Vacuum @ 4.21e-07T . RGA status: Water @ 2.52e-007

Thursday, May 10, 2018, 07:41: Status Vacuum @ 3.24e-07T . RGA status: Water @ 1.76e-007.

Purge all water from lines. Prep for He.

Hook up Leak Detector. Leak detector # 5 (DRY) from Vacuum Group. Startup

Thursday, May 10, 2018, 08:00: Baseline Reading:

TP pressure 0.0e-04

Leak rate: Below 0.0e-09 atm-cc/sec

Vacuum @ 3.15e-07T . RGA status: Water @ 1.65e-007.

Valve to chamber opened. LD connection clear.

Leak rate:  1.6e-08 atm-cc/sec

He TEST #2:

Thursday, May 10, 2018, 08:13: Purge both lines with He. Do not pressurize.

Vacuum @ 3.15e-07T. RGA status:

Water @ 1.76e-007

He: -1.51e-009

LD:  1.5e-08 atm-cc/sec

Thursday, May 10, 2018, 08:15: Open line FS#3 to Coil Block. Pressurize to 30 PSI.

Thursday, May 10, 2018, 08:40: Vacuum @ 3.22e-07T . RGA status:

Water @ 1.80e-007

He:-1.98e-009

LD: 7.1e-08 atm-cc/sec. Purge and close FS#3.

Thursday, May 10, 2018, 08:45: Open line FS#5 to Heat Shield. Pressurize to 30 PSI.

Thursday, May 10, 2018, 09:10: Vacuum @ 3.22e-07T. RGA status:

Water @ 1.79e-007

He:-1.39e-009

LD:  1.5e-07 atm-cc/sec

09:15: Depressurize lines. Connect HPA. 

09:30: Vacuum @ 3.22e-07T . RGA status:

Water @ 1.78e-007

He:-1.56-009

LD:  1.7e-07 atm-cc/sec

Thursday, May 10, 2018, 09:32: Close Valve & disconnect LD

Thursday, May 10, 2018, 09:35: Opened all waterlines completely. Vacuum stable @3.22e-07T and no response on the RGA.

Tuesday, May 15, 2018, 06:06: Auto ramping TGHT / TBHT to 580 / 270 A @ 2A per min.

Tuesday, May 15, 2018, 06:13: BIAS / EZL / EE @ 30 / 13 / 1.5 kV .

Tuesday, May 15, 2018, 06:17: Optics set. IV4 opened.

Tuesday, May 15, 2018, 08:35: RGA Restarted. Spikes noticed on BIAS current. Vacuum @ 2.57E-06T

Wednesday, May 16, 2018, 06:40: TMS:IG6 (between 3-4pm yesterday) and the RGA were both knocked out. Restarting both.

Wednesday, May 16, 2018, 06:48: Repeated attempts to reset/restart IG6 have failed. Closing IV4

Friday, May 18, 2018, 10:55: Auto-cooling @ 1A per min. IG6 still non-responsive.

Ready for C-seals or FEBIAD work

Monday, April 30, 2018, 12:05: Roughing.

Monday, April 30, 2018, 13:11: Turbo pumps on.

Monday, May 07, 2018, 15:02: RGA, ion gauge, and turbo pumps off.

Window changed on view port. Ta target prepared for Aurelia's tests.

***Note*** No Ta window foils on the end plates. Initial ramping to on the TGHT to 300 A. Follow up in increments of 50 A and check the right door window temperature.

Wednesday, April 25, 2018, 09:47: Roughing both the Evap/box end and beam end.

Wednesday, April 25, 2018, 10:27: All 4 turbo pumps started.

Wednesday, April 25, 2018, 10:49: Both Ion gauges on.

Wednesday, April 25, 2018, 14:56: RGA on.

Thursday, April 26, 2018, 06:54: Water lines opened. No response on RGA. Vacuum stable @ 4.23e-07T

Thursday, April 26, 2018, 06:56: Power/sources on.

Thursday, April 26, 2018, 07:00: Auto ramping TGHT  to 300 @ 2A per min.

Thursday, April 26, 2018, 07:05: IV4 opened. 

Thursday, April 26, 2018, 08:50: Door temp @ 25 C @ left window.

Thursday, April 26, 2018, 09:30: 300A reached. Door temp @ 26 C @ left window.

Thursday, April 26, 2018, 13:01: 550A Reached. Door temp @ 29 C @ left window.

Monday, April 30, 2018, 07:05: IV4 closed, RGA off.

Monday, April 30, 2018, 07:10: Ion gauge off. Turbo pumps off.

Monday, April 30, 2018, 11:00: Venting. Purging water lines.

The fan in the EZL power supply is making a terrible noise - keep an eye on it, it sounds like it might give up soon.

Monday, April 23, 2018, 10:47: The back panel was opened. Original entry stated EZL power supply issue. Corrected to BIAS PS. High voltage group notified. Fan replacement required.

Monday, May 14, 2018, 13:20: BIAS fans, external an internal were replaced. Re-installed @ TS.

Monday, May 14, 2018, 13:26: BIAS ramped up to 10 kV. Response ok on epics and locally on the PS. No odd noise on the fans either. The issue appears to be fixed.

Thursday, April 19, 2018, 12:52: Pin J1 was reconnected into the anode power supply. All jumpers were put back to remote control.

NOTE: the cable EXTLKT is still not connected. I will ask Carla about this one.

Thursday, April 19, 2018, 18:00: Cable EXTLKT connected.

Thursday, April 19, 2018, 18:12  When turning the transformer on, the Anode PS was not turned on. Neither the TGHT.

Thursday, April 19, 2018, 18:30: I turned off everything. Will check tomorrow with someone. 

Friday, April 20, 2018, 11:01 : Issue fixed. I've attached a picture of the jumpers connection for future references

Tuesday, April 17, 2018, 10:57: Vacuum not coming down. @ 1.514T . Backing valves have been closed.

TSG:CG1A @ 1.515T

TSG:CG1B @ 1.529T.

Tuesday, April 17, 2018, 11:02: TSG:PV1 Closed. Roughing pump off.

Vacuum group notified.

Wednesday, April 18, 2018: Replace pump & adapters. Clean.

Wednesday, April 18, 2018, 08:45: Start TSG:RP1 and open PV1, BV1A  & BV1B

Wednesday, April 18, 2018, 08:55: exhaust pipe/mesh cleared out back

Wednesday, April 18, 2018, 08:57: Turbo pumps on.

RP status ok.

Thursday, April 19, 2018, 08:30: waterlines opened. No response on RGA. Vacuum @ 3.42e-07T

New assembly & target. Same silver bolts.

Tuesday, April 17, 2018, 09:56: Roughing.

Tuesday, April 17, 2018, 10:57: Vacuum not coming down. @ 1.514T . Backing valves have been closed.

See* elog entry for roughing pump issue 04/17/2018

Wednesday, April 18, 2018, 08:57: Turbo pumps on.

Friday, April 20, 2018, 13:45: Power/sources on. RGA restarted

Friday, April 20, 2018, 13:46: IV4 Opened.

Friday, April 20, 2018, 13:50: Auto ramping TGHT / TBHT to 580 / 200 A @ 2A per min.

Friday, April 20, 2018, 13:56: BIAS / EZL / EE @ 30 / 13 / 1.5 kV . Spark @ Bias 28 kV knocked out RGA.

Friday, April 20, 2018, 13:59: RGA restarted.

Friday, April 20, 2018, 14:03: Optics on. Set

Friday, April 20, 2018, 14:40: Auto cooling TGHT / TBHT from 97 A @ 4A per min. Odd noise on (BIAS*) PS

Friday, April 20, 2018, 14:44: BIAS / EZL / EE @ 0 / 0 / 0 kV . Sources being turned off except TBHT and TGHT.

Monday, April 23, 2018, 10:46: FEBIAD TEST halted. See BIAS PS issue.

Tuesday, April 24, 2018, 10:46: Power off.

Tuesday, April 24, 2018, 10:48: RGA off.

Tuesday, April 24, 2018, 10:49: Ion gauge TSG:IG1 & Evap side turbos off,

Tuesday, April 24, 2018, 10:50: Ion gauge TMS:IG6 & beam side turbos off.

Tuesday, April 24, 2018, 10:54: Waterlines purged.

Wednesday, April 11, 2018, 10:19: Roughing

Started with Anode at 25V and coil at 0A, bias at 30kV. (attachment 1)

Ramped coil to 60A (0.4V) (attachment 2)

Ramped bias to 51kV, but then TP6 turned off and there was a momentary 0.2A decrease in the TGHT current. No spike in BIAS current seen, maybe TP6 is turning off for another reason? (attachment 3)

At 57kV, a small spark, heard outside the vacuum, sounding like it comes somewhere near the blue racks which hold the power supplies. It has sounded like that to me before. Did not turn anything off but bias current spiked from 110uA to 280uA. (attachment 4)

At 57.5kV another spark, taking down TP1B and TP6, as well as the CB1 steerers and TPS:Q1/2. TGHT current dropped momentarily from 581A to 240A, or so says EPICS. Maybe just a communications effect? Voltage for TBHT also dropped but nothing seen on TBHT. Coil current and voltage also showed small effects. (attachment 5)

After 10mins at 60kV, spike in bias current with slight spike in EE current but no other effects.

After 20mins everything has been stable, will turn the bias back to 30kV. As I turn the bias voltage down, the EE current ramps up. No change to EE voltage... (attachment 6)

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

Tuesday, March 20, 2018, 09:11: TMS:Q5 & TMS:Q2 controllers require repair. Unable to hold a negative voltage.

+ @ 680V

- @ 0V (Should be 680V as well)

Kyle L. & Rod N notified.

Tuesday, March 20, 2018, 12:58: The controller was fixed.

Friday, March 16, 2018, 08:42: Roughing.

Friday, March 16, 2018, 10:34: Turbo pumps started.

Friday, March 16, 2018, 10:40: Ion gauge on.

Friday, March 16, 2018, 10:45: RGA on.

Friday, March 16, 2018, 13:10: Check. Vacuum @ 7.37e-7T

Monday, March 19, 2018, 06:44: Waterlines opened: Vacuum stable @ 2.16e-07T

Monday, March 19, 2018, 06:46: Power/sources on.

Monday, March 19, 2018, 06:49: IV4 Opened.

Monday, March 19, 2018, 06:51: Auto ramping TGHT / TBHT to 580 / 200 A @ 2A per min.

Monday, March 19, 2018, 06:57: BIAS / EZL / EE @ 30 / 13 / 1.5 kV .

Monday, March 19, 2018, 07:02: Optics on & reset.

Monday, March 19, 2018, 10:53: Drops in BIAS voltage from 30kV to below 22.5 kV and spikes to the BIAS current (282 uA) observed. Unstable.

Monday, March 19, 2018, 12:56: Communications issue noted with the mass separator magnet. Increase in Amp achieves no change in Gauss. Kyle L notified.

TMS:HALLMB1:RDFIELD Communication error. 

Monday, March 19, 2018, 14:00: MB1 Communication error fixed. However the negative voltage on Q2 & Q5 in unavailable. 

Monday, March 19, 2018, 15:07: Auto cooling TGHT / TBHT to 500 / 150 A @ 6A/4A per min.

Monday, March 19, 2018, 15:17: Auto cooling halted. TGHT / TBHT @ 501 / 152 A. Manually put to 500 / 150 A.

Controller for TMS:Q5 & TMS:Q2 off for repair.

Tuesday, March 20, 2018, 09:09: Auto ramping TGHT / TBHT to 580 / 200 A @ 2A per min.

Tuesday, March 20, 2018, 12:58: The controller was fixed. Nb#08 conditioning continues with tests.

Wednesday, March 21, 2018, 06:24: Auto-cooling @ 2A per min.

Wednesday, March 21, 2018, 11:23: Sources at 0. Off.

Wednesday, March 21, 2018, 11:29: Power off. Waterlines purged.

Wednesday, March 21, 2018, 11:32: RGA off. IV4 closed/reset.

Wednesday, March 21, 2018, 11:33: Ion gauge off. Turbos off.

Wednesday, March 21, 2018, 13:15: Venting.

Tuesday, March 13, 2018, 08:50: Roughing.

Tuesday, March 13, 2018, 09:10: Turbo Pumps started.

Tuesday, March 13, 2018, 09:15: Ion gauge on.

Tuesday, March 13, 2018, 10:17: RGA started.

Tuesday, March 13, 2018, 13:15: Check Vacuum @ 6.56e-07T

Wednesday, March 14, 2018, 07:27: Waterlines opened. No response on RGA. Vacuum ok @ 2.69e-07T

Wednesday, March 14, 2018, 07:30: Power/sources on.

Wednesday, March 14, 2018, 07:35: Auto ramping TGHT to 580 A @ 2A per min.

Wednesday, March 14, 2018, 13:18: Vacuum ok @ 5.48e-07T

 Wednesday, March 14, 2018, 13:29: BIAS/EZL/EE to 30 / 13.5 / 1.5 kV.

BIAS current: 40uA

EZL current: 49uA

EE current: 518uA

Thursday, March 15, 2018, 08:00: Check, Vacuum @ 4.76e-07T

Thursday, March 15, 2018, 13:19: Check, Vacuum @ 4.65e-07T

Thursday, March 15, 2018, 15:13: Started cool down. Vacuum at 4.76e-7 by AM

Friday, March 16, 2018, 06:24: Power/sources off.

Friday, March 16, 2018, 06:27: Waterlines purged

Friday, March 16, 2018, 06:28: RGA, ion gauge, and turbos off.

Friday, March 16, 2018, 07:57: Venting.

Pressure:

Ramping up:

• Second attachment - bias at 50kV
• Third attachment - bias at 60kV
• Fourth attachment - bias at 65kV

Pressure has been slowly falling since we started this test - now down to 8.7e-7

Spark after 10 mins, see attachment 5. Very slight vacuum jump (8.5e-7 -> 1.2e-6) and bias current jump (36uA -> 113uA). Tripped TP6 and the steerers, as usual. Bias current read back more erratic afterwards (see sixth attachment).

System has been stable for 20mins, though current on bias is still more erratic than before the spark. Increasing He leak rate from 7 to 7.06 to bring vacuum back up to 2e-6 (see attachment 7). No effect from increased pressure.

Tuesday, March 13, 2018, 05:52: Power off.

Tuesday, March 13, 2018, 05:56: Waterlines purged

Tuesday, March 13, 2018, 05:57: Ion gauge, Turbos off.

Monday, March 12, 2018, 09:45: Gas lines opened. Leak rate set. Vacuum @ 1.16e-06T

Monday, March 12, 2018, 10:00: RGA on

Monday, March 12, 2018, 10:07: RGA off. Manually shut off power as well

First attachment: BIAS/EE/EZL = 63.25/-1.5/31 So far no issues.

Second attachment: BIAS/EE/EZL = 64.25/-1.5/32 Slight spark - bias current jumped from 40uA to 88uA and vacuum jumped from 2e-7 to 2e-6... Steerers went off.

Third attachment: BIAS/EE/EZL = 65/-1.5/32  Some small signs of instability in the bias power supply

Fourth attachment :  BIAS/EE/EZL = 65/-1.5/32  Been running for 20 mins now. More variation on the bias current output than at lower voltages but not too bad

The resistor/varistor combinations across the target + / -, tube + / - and target- / tube + have been remade and moved to the back of the power supplies to limit the corona discharges at higher voltages. Pictures attached.

I have removed the resistor/varistor combinations that go between the poles of the target and tube heaters, and between those two supplies. I tested all the components to make sure they were still working after the sparks - for the record the varistors clamp at 23V, not 33V as implied by the schematic.

Tuesday, March 06, 2018, 10:48  BIAS/EE/EZL = 59.5/-1000/29.5  There was some kind of spark, the current on the bias supply went up to 400uA ( normally at 40 +/- 5 ) and the vacuum jumped a bit ( but still in the 10e-7 range ) but I didn't hear anything. It took out TP6 again. See first attachment.

Tuesday, March 06, 2018, 10:54  BIAS/EE/EZL = 60/-1/30

...

Problems

...

Tuesday, March 06, 2018, 12:00 BIAS/EE/EZL = 60/-1.5/29

Tuesday, March 06, 2018, 12:37 BIAS/EE/EZL = 62/-1.5/30

Tuesday, March 06, 2018, 14:11 BIAS/EE/EZL = 64/-1.5/31 No sparks but occasional ticking sounds from either the EZL or behind where the EE is... see second screenshot

Tuesday, March 06, 2018, 14:40 BIAS/EE/EZL = 65/-1.5/33

Test stand has been sitting at 65kV for about an hour now. Some small increases in bias power supply current but nothing significant (40uA). Some small sparks on the way to this voltage, and I ramped up very slowly. The corona discharges seen before seem to be related to the resistor/varistor combos since there are none now that I have removed them. Will redesign and reinstall.

Turning up bias, no corona discharge at 60kV but a spark at 61.5kV bias, 31kV EZL, -800V EE

Thursday, March 01, 2018, 10:26: BIAS / EZL / EE @ 65 / 32.5 / 3.2 kV

Thursday, March 01, 2018, 10:32: Spark* Knocked out turbo pump TMS : TP6 (Restarted) Communications restarted. RPM0A restarted.

Thursday, March 01, 2018, 10:44: BIAS / EZL / EE @ 61 / 30.5 / 3.1 kV

New parts installed. Corona Shield, brackets, and board/spark gap orientation.

Wednesday, February 28, 2018, 11:48: Power on. Ready to test

Wednesday, February 28, 2018, 14:00: BIAS / EZL / EE @ 30 / 13 / 1.5 kV

Wednesday, February 28, 2018, 14:06: BIAS / EZL / EE @ 40 / 17 / 2.0 kV

Wednesday, February 28, 2018, 14:11: BIAS / EZL / EE @ 55 / 24 / 2.8 kV

Wednesday, February 28, 2018, 14:16: BIAS / EZL / EE @ 60 / 28 / 3.1 kV

Wednesday, February 28, 2018, 14:18: BIAS / EZL / EE @ 62 / 30 / 3.2 kV

Wednesday, February 28, 2018, 14:21: BIAS / EZL / EE @ 63 / 31 / 3.2 kV

Wednesday, February 28, 2018, 14:26: BIAS / EZL / EE @ 65 / 32.5 / 3.2 kV

Wednesday, February 28, 2018, 14:32: BIAS / EZL / EE @ 66 / 33 / 3.3 kV

Wednesday, February 28, 2018, 14:35: BIAS / EZL / EE @ 66.5 / 33.5 / 3.3 kV ***2 sparks***

Wednesday, February 28, 2018, 14:37: BIAS / EZL / EE @ 66 / 33 / 3.3 kV

Wednesday, February 28, 2018, 14:41: BIAS / EZL / EE @ 66.5 / 33 / 3.3 kV

Wednesday, February 28, 2018, 14:44: BIAS / EZL / EE @ 67 / 33 / 3.3 kV

Wednesday, February 28, 2018, 14:47: BIAS / EZL / EE @ 68 / 33 / 3.3 kV

Wednesday, February 28, 2018, 14:49: BIAS / EZL / EE @ 68.75 / 33 / 3.3 kV ***Spark***

Wednesday, February 28, 2018, 14:51: BIAS / EZL / EE @ 68 / 33 / 3.3 kV

Wednesday, February 28, 2018, 14:57: *** 2 sparks ***

The BIAS was pushed to 69 kV however the resulting sparks shut down the communications with the test stand computer.

RPM0B was put into a continuous running cycle and had to be shut off manually.

The voltage was brought back down remotely via a separate computer. Turbo pump TMS : TP2 was also restarted.