Determined on Friday April 16th that the water leak was on the coil negative circuit. This was determined by circulating water through once circuit at the time. Only HF and GE tested (not Extraction Electrode).

 Wednesday, April 28, 2021, 22:30

First P2N heating test ongoing.

At P2NHT ~ 570 A and TBHT ~ 100 A shine is already seen, which suggests that current is flowing in the P2N target properly, see picture attached.

Most of the ramping is carefully monitored because the good vacuum signal from the TTS ramping procedure is obviously not working (bypassed), and if the pressure goes past 1E-5T the whole ITS should interlock and abruptly drop the currents, which we want to avoid.

Wednesday, April 28, 2021, 23:16

P2NHT set current = 810 A

P2NHT read current = 800 A

Master and slave have balanced fully, TBHT ramping still proceeds manually. I'm trying to get it to ~200A before leaving.

 Thursday, April 29, 2021, 00:54

Ramping successfully achieved.

P2NHT_Master = 594 A - 4.59 V

P2NHT_Slave = 611 A - 4.89 V

P2NHT = 1207 A

TBHT = 231 A - 2.29 V

Max temperature of welding cables = 40 deg

Zero current from the HV ground terminal (feedthrough I) to slave negative (feedthrough H)

No P2N is loaded. Testing the power supplies.

Tuesday, May 03, 2022, 10:07

In the past few days, the ITS has been reconfigured for P2N operation:

•  The two ATTS PS were moved to the ITS rack, one on top of the TGHT and the other instead of the COIL
• AC rewiring was necessary since the breakers were not connected to the wires. Marshall was on it and re-connected
• Ray has configured the ATTS PLC to be compatible with P2N operation in ITS
• The controls cables to the MASTER and SLAVE supplies have been configured: the cables come from the front of the PS rack, so we could close the back and top cage if we wanted. One control cable was connected to the relay to send the proper ENABLE signal only when the ITS vacuum and water flow are OK
• DC cables re-routed for P2N parallel operation:
  MASTER+ = D
  MASTER- = C
  SLAVE+ = E,G 
  SLAVE- = F,H
  TBHT+ = A
  TBHT- = B

Wednesday, May 04, 2022, 07:54: PS main shutoff. IG1 & Turbo pumps off.

Thursday, May 05, 2022, 14:43: Roughing. Open BV1B

Thursday, May 05, 2022, 14:46: Upper chamber cage closed. The rest remains open. Open BV1A.

Thursday, May 05, 2022, 15:20: TP1B up to speed.

Thursday, May 05, 2022, 15:25; TP1A on.

Thursday, May 05, 2022, 15:32: TP1A to speed. IG1 on.

Thursday, May 05, 2022, 15:33: Vacuum @ 4.72e-05T. FS#5 Open. No spike. ok.

Thursday, May 05, 2022, 15:34: Vacuum steady 4.09e-05T & dropping.

Beginning of May:

The cabling on the top of the test stand was changed to adapt for P2N testing. The TGHT and COIL PS were disconnected, and their DC cable terminals were connected instead to the TDK-LAMBDA P2Nheaters. The configuration on top of the ITS module is the following:

TBHT+ = A

TBHT- = B

MASTER+ = D

MASTER- = C

SLAVE+ = G/E

SLAVE- = F/H

Friday May 6th, afternoon

Once the pressure was almost stable in the low E-6 torr range, the first rampup was conducted up to ~600 A and the I,V parameters looked similar to previous P2N units. More tests to full current happening next week.

Monday, May 09, 2022, 09:29

P2N unit is being heated now, the automatic ramping utility is ramping the TDK-LAMBDAs while the TBHT is being increased manually.

Monday, May 09, 2022, 10:31

A voltage event happened, the TBHT voltage increased frmo 0.64 V to 0.73 V, while the P2Nheater dropped from  1.73 V to 1.56 V. 

Monday, May 09, 2022, 12:19

At P2NHT=950A it was noticed that one leg of the P2N was glowing much more than the other, the ramping was first stopped and then ramped down.

Now the P2NHT=282A and TBHT=47A

Tuesday, May 10, 2022, 09:32

Test stand vented and target inspected, there is no obvious sign of damage or misconnection on the tantalum assembly. Some resistance measurements were taken across target elements and connections: 

Screw on copper L to bottom flexy leg L = 117

Bottom flexy leg L to top flexy leg L = 24 / 0 (?)

top flexy leg L to bottom elephant leg L = 64

elephant L to elephant R = 360

top flexy leg R to bottom elephant leg R = 69

Screw on copper R to bottom flexy leg R = 125

Tuesday, May 10, 2022, 11:39

This morning, the target was inspected but nothing major was noticed, hence it was put back in the ITS for heating.

Tuesday, May 10, 2022, 17:40

Target being ramped: so far all good, total current in P2NHT=690A and TBHT=116A

A current measuring clamp was used to measure current in the 4/0 cables. The only bad thing is that the slave outputs half the current than the master, making the cables hotter (30deg vs 24deg).

Currents:

A-B ~116 A (TBHT)

C~468

E~124

G~102

Tuesday, May 10, 2022, 17:45

Event: reduction in P2NHT voltage and increase in TBHT voltage. After letting the PS ramp, it was noticed that the P2NHT voltage accelerated its increased, and the left leg started glowing like the previous time. The current was immediately ramped down, but still there was a voltage spike upwards in the P2NHT. 

While the leg was glowing hot, the current between feedthroughs H (P2NHT-) and I (HV common) was 90A. Now that the "episode" is not there any more, the current is zero

Wednesday, May 11, 2022, 10:55 

The previous P2N target had stainless steel screws at the bottom, where the copper L-shaped connector and the ta foil legs connect, which might have bene the cause of the gap opening and voltage increase. Now, the target manufactured for the previous beamtime is used, which does not have the cuts on the elephant ears but they are OK since don't interfere with the new IS cup design, and are ~3mm away from it.

Wednesday, May 11, 2022, 13:57 

 Start heating the new P2N assembly

Wednesday, May 11, 2022, 14:58

 Stopped at

P2NHT= 501 A

TBHT= 95 A

All currents seem to be flowing in the right path, with no current in the jumper between H-I

Wednesday, May 11, 2022, 15:26

Voltage step in P2NHT and TBHT happened again. Current sum:

A = 125 A

B = 125 A

C= 470 A

D=474 A

E = 118 A

F= 85 A

G = 95 A

H = 132 A

Short G-E = 5 A

Short F-H = 3 A

Jumper H-I = 62 A

The most likely explanation of this jump is that the IS tip touches the plasma electrode as shown in the drawing below which would result in some current flowing through the jumper, more investigations are needed

Thursday, May 12, 2022, 08:19

Test stand opened, there is some sign of burn in the plasma electrode, but it's hard to say if it's because they were touching. Aaron added a tantalum 0.040" shim to the plasma electrode to distance it further from the target IS tube

Thursday, May 12, 2022, 13:20

ITS with P2N target installed and pumping down 

Thursday, May 12, 2022, 15:50

P2NHT started ramping 

 Ref: https://elog.triumf.ca/TIS/Test-Stand/924. During testing, it was noted one leg was glowing vs the other. P2N assembly was removed & inspected. No contact or defects were found.

Tuesday, May 10, 2022, 10:05: Roughing.

Tuesday, May 10, 2022, 10:42: TP1 on.

Tuesday, May 10, 2022, 10:50: TP1A on.

Tuesday, May 10, 2022, 10:58: IG1 on. Vacuum @ 1.77e-05T & dropping.

Tuesday, May 10, 2022, 13:45: Vacuum @ 5.63e-06T. FS#5 Opened.

Tuesday, May 10, 2022, 13:58: Vacuum @ 5.27e-06T.

Target oven #45241-1 swapped out. SS bolts were in use on the legs.

Molybdenum screws in the legs on oven #44812-2. No target to ion source cup interference. 3mm gap - OK.

TGHT - R: 1.215

TGHT - L: 1.206

TBHT - R: 2.014

TBHT - L: 2.013

Cathode cable detached from feed-through (B).

Wednesday, May 11, 2022, 10:04: Roughing.

Wednesday, May 11, 2022, 10:33: TP1B on.

Wednesday, May 11, 2022, 10:43: TP1A on.

Wednesday, May 11, 2022, 10:51: IG1 on.

Wednesday, May 11, 2022, 13:43: Vacuum @ 5.43e-06T. FS#5 Open.

Wednesday, May 11, 2022, 13:45: Vacuum @ 5.36e-06T. OK.

PE shimmed & extended 1mm due to likely ion source contact.

Thursday, May 12, 2022, 10:41: Roughing.

Thursday, May 12, 2022, 11:26: TP1B on. 

Thursday, May 12, 2022, 11:35: TP1A on.

Thursday, May 12, 2022, 11:43: IG1 on.

Thursday, May 12, 2022, 11:48: Vacuum @ 2.65e-05T. FS#5 Opened. No immediate spike.

Thursday, May 12, 2022, 11:50: Vacuum @ 2.47e-05T & dropping.

Friday, May 13, 2022, 07:32: TP/IG off.

Friday, May 13, 2022, 09:51: Venting.

Wednesday, September 14, 2011, 15:39: Vacuum at 1.3e-5 torr 

Thursday, September 15, 2011, 08:59: Vacuum at 2.9e-7 torr. Water flowing and vacuum stable. 

Started the HV conditioning: TSG:BIAS=30kV and TSH:EE=-700V.

Heaters conditioning went fine: 580A and 230A.

Did a mass scan:

Plotdump-local-clean.txt Sept19 11 12-45-22.txt

Set for Li-7 for over the night on TMS:FC6.

Tuesday, September 20, 2011:

Did another mass scan today at 5:40. Saved as: plotdump-local-clean.txt Sept 20 11 11-51-20.txt

Started target cool-down. Tomorrow the target would be ready to be removed from the Test Stand.

Wednesday, September 21, 2011:

Turned off the HV & optics.

Target is ready to be removed. Currently, it's under vacuum and the water is still on.

Venting chamber and purging cooling lines in preparation for target removal

Anders Mjos wrote:

Venting chamber and purging cooling lines in preparation for target removal

 Monday, April 16, 2012, 11:55: Target removed. Cooling lines must be blanked off before pumping down.

 When the target was removed from the test stand it was discovered that the custom designed insulator stand-off (ITD0400 made from Mycroy 1100) had swollen and become discoloured in the area exposed to "heat shine" from the target oven. See attached pdf for photos of the insulators.

The heat shield lid was opened up and the target temporarily removed to replace the two insulators that had failed. These were replaced with the commercially available glazed steatite stand-offs. The target had some marks from the insulators which was cleaned with acetone and methanol.

After replacing the insulators, the target assembly was assembled, leak checked and a new electrical check was performed.

Additional photos are available on DocuShare

Thursday, May 31, 2012, 15:42: Roughing

Thursday, May 31, 2012, 16:01 : Starting turbos

Thursday, May 31, 2012, 16:08 : Turbos at speed. Vacuum 1.7 E-5

Friday, June 01, 2012, 08:08: Cooling water opened. Vacuum stable at 5.7E-7. Target ready to be heated and biased.

Did the HV conditioning.

Heaters conditioning in progress.

The Hall probe is not working: couldn't pass 35.5 units (readback) or 50.16 units (setpoint) at field -3710G.

Tried to turn ON/OFF magnet PS and to reboot Canbus, but nothing worked. Still waiting for E-Fault 6031 to be resolved.

Started cool-down.

Aurelia Laxdal wrote:

Did the HV conditioning. Heaters conditioning in progress. The Hall probe is not working: couldn't pass 35.5 units (readback) or 50.16 units (setpoint) at field -3710G. Tried to turn ON/OFF magnet PS and to reboot Canbus, but nothing worked. Still waiting for E-Fault 6031 to be resolved. Started cool-down.

 Monday, June 04, 2012, 10:51: Turbos switched off

Monday, June 04, 2012, 11:06: Purging water. Venting.

Monday, June 04, 2012, 11:36: Target removed

Friday, August 31, 2012, 15:19: roughing

Friday, August 31, 2012, 15:39 : starting turbos

Friday, August 31, 2012, 15:44 : TP1B at speed

Friday, August 31, 2012, 15:48 : TP1A timed out

Friday, August 31, 2012, 15:48 : TP1A restarted. at speed.

Friday, August 31, 2012, 15:49 : both turbos at speed. Vacuum @2.7E-5

Anders Mjos wrote:

Friday, August 31, 2012, 15:19: roughing Friday, August 31, 2012, 15:39 : starting turbos Friday, August 31, 2012, 15:44 : TP1B at speed Friday, August 31, 2012, 15:48 : TP1A timed out Friday, August 31, 2012, 15:48 : TP1A restarted. at speed. Friday, August 31, 2012, 15:49 : both turbos at speed. Vacuum @2.7E-5

 Tuesday, September 04, 2012, 08:10: Opened cooling water. Vacuum stable @ 2.2E-7