• gas lines purged with air for 60 min (through TSHUHV1 and TSHSV4).
• gas line allowed to fill with nitrogen to 300 torr and evacuated. repeated 3 times.

Friday, December 14, 2012, ~ 17:00: start roughing pumps

Friday, December 14, 2012, 20:33: start turbo pumps

Friday, December 14, 2012, 20:42 : turbos at speed

Friday, December 14, 2012, 20:43 :  vacuum at 7.32E-6T

Monday, December 17, 2012, 12:53 vacuum at 1.77E-7T

Friday, August 02, 2019: p2n target installed in the test stand, the ion source was fully removed to avoid any risk of shorting. The Central ion source current lead is attached to the target body so it was left there and attached to its electrodes.

Friday, August 02, 2019, 13:15: Roughing.

Friday, August 02, 2019, 13:58: BV1A closed to allow pressure stabilization. Opened about 10-15 seconds later with BV1B.

Friday, August 02, 2019, 14:00: Turbos pumps on.

Friday, August 02, 2019, 14:09: Ion gauge on.

Friday, August 02, 2019, 15:15: RGA cycled. Now the filament can start. RGA on.

Tuesday, August 06, 2019, 07:49: RGA Error. Halted.

Tuesday, August 06, 2019, 07:53: Restarted RGA.

Tuesday, August 06, 2019, 09:32: Waterlines opened on FS#5. No response on RGA. Vacuum ok @ 1.16e-06T.

Power on.

Tuesday, August 06, 2019, 16:00

Start ramp up to 300+300 = 600 A

Tuesday, August 06, 2019, 17:30

Wednesday, August 07, 2019, 08:11

The same p2n target was installed in the test stand, taking off the ion source since we thought it could have been shorting to the reference electrode and providing a return path for the current, hence generating the asymmetric heating that was noticed on the target.

On Tuesday 6th afternoon, the p2n was ramped up to 600 A (300 + 300 A from TGHT and TBHT in parallel). The target and its right flexible leg were still glowing. After noticing it, the current was ramped down wating to open up for inspection.

Friday. July 26th 2019 

A new electrical configuration of the test stand was decided and installed. The TGHT and TBHT were parallelized in order to deliver up to 600 + 600 Amperes to the p2n target.

Connections:

TGHT+: D

TGHT-: C

TBHT+: one cable to E and one cable to G (both going down to the coil terminal blocks, which are connected to the target terminal blocks through a copper short.

TBHT-: both cables to F. One 4/0 cable was run from F to H to achieve the same configuration as for TBHT+. The H terminal is connected to I (HV ground, conencted to the target copper heat shield) through a braided cable

One braided cable was connected from C to H so the target line should have the same potential as the TBHT/coil lines.

Saturday, July 27th

The current was ramped from the TBHT and TGHT in parallel up to 400+400=800A.

Sunday, July 28th

One leg of the target is glowing a bit, while the other doesn't. This suggests the current path is not straightforward as we planned.

Temperature measurements of the cables on top of the test stand were performed using a mini IR thermometer (FLUKE, borrowed from Arthur).

Temperature of the braided cable from C to H = ~50 °C --> This points to an imbalance of current between the two lines (TGHT and COIL lines). This might be alright.

Temperature of the braided cable from H to I = ~130 °C. This likely points to a short circuit between the target and the copper heat shield.

Monday, July 29th

In order to understand if the target is broken or touching the heat shield, we opened up the service cap.

- The braided cable from H to I was removed

- The braided cable from H to Q was disconnected

These two modifications were made so that the current cannot come back from the heat shield, but has to go through the target lines.

The 4/0 cables from the PS to the feedthroughs were removed so that we could confirm there is a short between C (target) and I(HV ground/heat shield). The 4/0 were than put back on the feedthrough connections.

Under advice of Dan Louie and Arthur, we did not change any configuration of the power supplies. We know that the current would go through the controls loop, but the impedance of this electronics should be high enough to sustain the current load.

At 3pm, the ramping was still increasing the current on the target, but one leg (the right one) was still glowing. By this time, the total current in the target assembly is ~500 amperes, so there should be no signs of any glowing happening. Probably there's something wrong with the target itself. We're opening up to check the status of the target.

Tuesday, July 30, 2019, 10:00: Venting. 

Tuesday, July 30, 2019, 10:03: Purging heat shield water loop. 

Tuesday, July 30, 2019, 11:46: P2N removed

The p2n target was taken out of the test stand for inspection. Comments and measurements on the container below:

- Initially, continuity measurements were mode between the target and heat shield (HS) while they were still in the test stand, and looks like they were shorted. However, after removing the HS from the test stand, no short was seen, not even after moving the target legs. Instead, we confirmed that the short was happening in the test stand, so some water lines were touching each other. 

- The target look in one piece, except for the ion source that came off right after manufacturing. (see picture)

- The insulator connecting the bottom section of the ion source central current lead, to the HS, was broken (see picture)

- The annular disc of the connecting the inner and outer tube of the ion source was bulging outwards, maybe the ion source was heating too much while we put current in it (see picture).

- The screw connecting the top part of the central ion source current lead, is now of a blue-ish color

Resistance measurementts:

- Copper to copper: 1008 microOhm

- Copper to bottom flexy leg: 101 microOhm

-  Bottom-to-top (flexy): 30-45 microOhm

- Target: 476 microOhm

- Copper to top flexy: 261 microOhm

- Copper to bottom flexy (left): 100 microOhm

- Copper to bottom flexy (right): 94 microOhm

- Top Flexy - botton target assy (left): 88 microOhm

From left to right:

- Cu to bottom flexy leg: 102

- Flexy bottom to flexy top: 31

- Flexy top left to flexy top right: 473

- Flexy top to flexy bottom: 0 (???)

- flexy bottom to Cu: 93

 The electrical feedthroughs at the top of the test stand module were reconfigured to deliver up to 1200A to the p2n target.

1) The two COIL lines (one + and one -) were disconnected from their terminals E and F

2) The TBHT terminals (two + and two -) were disconnected from A and B

3) The two TBHT positive terminals are connected to E and G respectively. The two TBHT negative terminals are both connected to F, and a 4/0 cable is run from F to H

4) The three TGHT + terminals are left connected to D. The three TGHT - terminals are left connected to C

In the vacuum chamber, COIL and TGHT terminals of the same polarity are shorted by means of thick copper bars specifically machined to match the test stand terminals geometry. The test can proceed by ramping both TGHT and TBHT up to 600 A each, possible at the same time and speed.

The wiring diagram is shown in the attached picture 

Extech measurements before heating (µOhm):

TGHT Left leg Ta-Cu: 205, 215, 212, 201.

TGHT Right leg Ta-Cu: 287, 295, 275, 292.

TGHT Ta legs: 596, 606, 597, 598.

TBHT A: 1470, 1471.

TBHT B: 1469, 1469.

Wednesday, July 22, 2020, 16:21

Rampup finished around 2PM, looks good. Around 300+300A the TBHT voltage limit prevented the TBHT current to increase, and instead it decreased. Aaron ramped it down, adjusted the voltage limit and proceeded without issues.

The water flow and temperatures looked fine.

Attached the plots and a picture at 1200A

 Thursday, July 23, 2020, 11:53

Frank Song checked for us the status of the test stand. Pictures looked good, despite the reflections, I can't see sign of the flexy legs glowing. Thank you Frank!

The voltage on the TGHT has dropped 0.02 V, and the voltage on the TBHT (COIL lines) has dropped by 0.04V in 20 hours. I think it's negligible, just a sign of some sintering.

The cooling parameters are as follows:

Input 1: 28.05 C

Input 2: 8.49 lpm

Input 3: 27.79 C

Input 4: 11.14 lpm

Input 5: 27.72 C

Input 6: 3.90 lpm

Input 7: 27.78 C

Input 8: 7.79 lpm

Friday, July 24, 2020, 16:42

This morning I saw the target for my first time and not in a picture. I could see a mild glow in the center of both flexy legs, while the external foils seemed cold. This seems really good, as expected!

Water parameters were checked:

Input 1: 27.75 C

Input 2: 8.38 lpm

Input 3: 27.52 C

Input 4: 11.13 lpm

Input 5: 27.37 C

Input 6: 3.93 lpm

Input 7: 27.53 C

Input 8: 7.78 lpm 

Monday, July 27, 2020, 09:35

Aaron's measurement from today at 7:30am

 Input 1: 26.61 C

Input 2:  8.25 lpm

Input 3: 26.35 C

Input 4: 11.19 lpm

Input 5: 26.21 C

Input 6: 3.84 lpm

Input 7: 26.35 C

Input 8: 7.76 lpm

FM

Thursday, July 30, 2020, 15:53: Auto-cooling TGHT/TBHT to 0 @ 4 A/min 

Thursday, July 30, 2020, 23:02

Ramp down terminated around 7pm, the current was ramped smoothly but the voltage from both PS (TGHT and TBHT) had some bumps in correspondance with vacuum response. Maybe something was shorting? A thorough inspection of the heat shield and target might tell more.

Thanks Fernando for ramping down! 

Tuesday, August 04, 2020, 07:33: PS / sources off. Lock out. IG & Turbo pumps off. Purge waterlines. - AS

Tuesday, August 04, 2020, 09:32

Started rewiring the test stand.

TBHT+ (A1 and A2): connected to A

TBHT- (B1 and B2): connected to B

COIL+ (A3): connected to E

COIL-(B3): connected to F

4/0 short connection from F to H removed

Tuesday, August 04, 2020, 15:27

Extech measurements after heating (µOhm):

TGHT Left leg Ta-Cu: 160, 176, 184, 180

TGHT Right leg Ta-Cu: 49, 48, 52, 53.

TGHT Ta legs: 470, 469, 463, 480.

TBHT A: 2400, 2229,2492.

TBHT B: 2361, 2411, 2412.

(see entry 742)

p2n target heated over the weekend after the connections between the bottom target legs and the copper connector has been modified from rivets to M3 screws. Target hold current nicely with no major voltage spikes.

The plan now is to cycle the current heating few times to "stress test" the target.

Edi replaced the faulty turbo pump in the mass separator section.

Roughing and turbo started

vacuum @ 9E-7T after 2.5h

bigger mass scan after separator optimization and with finer step size

Friedhelm Ames wrote:

bigger mass scan after separator optimization and with finer step size

 total curren on Fc0 183 nA gas valves SV2/5 open leak valve at 7.2 SV1 closed

mass scan started again. Total current 3.2e-8 A

mass scan has been started after optimization on 23Na

mass spectrum saved as

plotdump-local-clean.txt_Jun29_12_14-55-43.txt

Friedhelm Ames wrote:

mass spectrum saved as plotdump-local-clean.txt_Jun29_12_14-55-43.txt

 new parameters for mass scan program after fit of mass scan

CONST11 = -4.13

CONST22 = 0.09595

mass scan is finished saved as

http://isacwserv.triumf.ca/onlylocal/isactdata/save_restore/masscorr/plotdump-local-clean.txt_Sep7_12_13-01-51.txt

mass scan crashed due to a network error will be restarted tomorrow

mass scan with valve at 7.2 to let in Al(CH3)3 saved as

plotdump-local-clean.txt_Feb29_12_17-19-20.txt

Wednesday, July 22, 2024, 11:41  - target installed

Wednesday, July 22, 2024, 13:31 - pumping down

Wednesday, July 22, 2024, 14:21 - turbo pumps on

Wednesday, July 22, 2024, 16:35 - water cooling on - no pressure increase

Tuesday, July 23, 2024, 09:42  - TGHT/TBHT ramping up to 580/230A at 1A/15s. 

 Tuesday, July 23, 2024, 09:55  increasing ramp rate to 1.4A/10s

 Tuesday, July 23, 2024, 11:17  increasing BIAS / EE / EZL to 30 / -1.5 / 13 kV.

Tuesday, July 23, 2024, 11:44    sparks more frequent than expected.   FC0 current at 1.17e-8A

Tuesday, July 23, 2024, 11:48    decreasing bias to 29.5k until spark frequency reduces

Tuesday, July 23, 2024, 13:23   once back up to 30kV, mass scan was run

Tuesday, July 23, 2024, 13:23 bias ee ezl were dropped to zero. reservoir heater was switched to 5A. the vacuum jumped up and shut down TGHT TBHT. heater turned off. TGHT TBHT restarted and reheated.

Tuesday, July 23, 2024, 13:24 reservoir heater turned to 2A while monitoring the vacuum. then to 3A as it appeared to be stable. at 4A the vacuum began slowly increasing.

Tuesday, July 23, 2024, 13:30   4A vacuum plateaus and recovering

Tuesday, July 23, 2024, 14:30 once reservoir heater is at 5A with a stable vacuum, increasing BIAS / EE / EZL to 30 / -1.5 / 13 kV

Tuesday, July 23, 2024, 14:50 running mass scan

Tuesday, July 23, 2024,  15:20 dropping BIAS / EE /  EZL to zero

Tuesday, July 23, 2024, 15:40   turning off reservoir heater

Tuesday, July 23, 2024, 15:51  increasing BIAS EE EZL to 30 -1.5 13 kV.

Tuesday, July 23, 2024, 16:05  running mass scan

Tuesday, July 23, 2024, 17:00   cooling target. TGHT TBHT to 0 at -1A/30s

Wednesday, July 24, 2024, 09:24 purged water lines and turned off TP1A and TP1B, TP6 and TP2 --- waiting for TP to slow down.  (will be venting beam line to change window)