ISAC operators attempted HV conditioning over the weekend.

https://web.accel.triumf.ca/isac_elog/Elog_show_result.pl?inid=218447&style=entry

Today, the commissioning of the TCS went well. The water/vacuum interlocks were checked OK. Then, the TCS was HV conditioned up to 33kV.

Tomorrow, the heaters will be ramped up.

After few hickups the TCS was successfuly commissioned.

In the morning, in the middle of the heaters conditioning: 360A/250A for the TGHT/TBHT, the target heater PS tripped and it didn't recover immediately.  I cannot tell if the card is still OK. Before this even, there were few bias current sparks created when the ionized tube was raised above 250A; this also tripped the Einzel lens. Re-started the Heaters, and did the conditioning with the rest (HV, Optics) Off. After the heaters were at nominal values, raised the rest: HV to 30kV and the Optics. And everything held fine. The current on the FC was 3micro-Amperes. The water temperature levels stayed below 25 deg Celsius.

The problems that need to be fixed:

1. The biggest problem was created by the target power supply: the new card is not calibrated, the voltage is not regulating, but the main problem is the grounding of the output of power supply. Friedhelm measured 0.2V across the return and the cage (200mili-ohms resistance) .  This was probably overlooked.

2. The Auto-ramping routine didn't work. Controls would need to fix this.

3. The RGA didn't want to connect from the account Don created for me. So, we have only a RGA scan taken on Friday by Don, when the target was cold.

Aurelia Laxdal wrote:

After few hickups the TCS was successfuly commissioned. In the morning, in the middle of the heaters conditioning: 360A/250A for the TGHT/TBHT, the target heater PS tripped and it didn't recover immediately.  I cannot tell if the card is still OK. Before this even, there were few bias current sparks created when the ionized tube was raised above 250A; this also tripped the Einzel lens. Re-started the Heaters, and did the conditioning with the rest (HV, Optics) Off. After the heaters were at nominal values, raised the rest: HV to 30kV and the Optics. And everything held fine. The current on the FC was 3micro-Amperes. The water temperature levels stayed below 25 deg Celsius. The problems that need to be fixed: 1. The biggest problem was created by the target power supply: the new card is not calibrated, the voltage is not regulating, but the main problem is the grounding of the output of power supply. Friedhelm measured 0.2V across the return and the cage (200mili-ohms resistance) .  This was probably overlooked. 2. The Auto-ramping routine didn't work. Controls would need to fix this. 3. The RGA didn't want to connect from the account Don created for me. So, we have only a RGA scan taken on Friday by Don, when the target was cold.

 Response to item 1. 

This morning I investigated the output of the TGHT power supply. The negative output of the power supply is tied to common as per ISK4574D Rev 7 (attached) and the released drawing IRH1511 Rev A (PDF attached but officially located in the SW vault). If this is not the intent of the IRH1511 should be released to Rev C reflecting the desired configuration. 

 In regards to the calibration of the card I will inform the PS group. 

All the F-308's can back from being certified at Nordion.  All of the F-308's have been serviced and are ready to be filled with spent targets.

Four empty F-308s just arrived back at Triumf. I moved them  from shipping to the Remote Handling Shop for service and inspection. I will work on them when not busy with my other shutdown work. ( Cyclotron work)

The new module move ventilation procedure was successfully tested (ITM:MP2). ITM:CM4 did not drop below 6 in during the test.

 The East Entrance Module has been moved from the East Target Station to the South Hot Cell.

Bill and I moved TM3 from SHC to NW silo with a dummy febiad target installed on it. The move is smooth.

TM2 has been moved to CS. All turbo-pumps have been started. The pumping down is good so far.  I connected the leak detector to service cap, and finished the leak check today.  The LD base LR:0.0Xe-9atm.cc/sec. 80psi helium were applied to coil1, coil 2. HS and window circuits, each for 2minutes. No any response has been found on LD. So all water lines are leak tight now. I also sprayed   helium to top service cap checking all air to   vacuum seals. They are all good either. But, The new installed PGN1 does not work. Other thing need to mention is The TP2 is running at 2.45A which is 1A higher comparing to TP1. It need to be monitored to see if we have to replace it or not. The high current cables and water lines will be connected tomorrow morning.

Electrical check of TM2 without target after that widget has installed, electrical check with the shunts on, electrical check with the dummy target installed.

TM#2 with the dummy target has been moved to the conditioning station.

TM#2 is now in the south hot cell.

TM#2 electrical check at the conditioning station. All pumps were off but the module was not vented.

 TM#2 with a new source tray and the dummy target has been moved from the south hot cell to the conditioning station.

 Electrical Check of TM#2 with the dummy target attached.

 TM#4 with dummy target has been moved from the south hot cell to the conditioning station.

Original Problem:

Leaks on the B and D copper blocks, probably due to corrosion between the blocks and the inserts. Final solution, after many tries, was to make an indium sheet the size of the copper blocks and use that to seal the entire surface.

So far offline tests seem to show these seals working, though long term tests are needed to say for sure.

New Problem:

TM4 was in the conditioning station, running water and under vacuum. 50A on the target and tube heaters from Friday evening to Saturday afternoon.

Sunday morning 9:30am target heating increased to 200A, 100A on the tube heater, ramp finishing around 1:30pm.

At around 3pm, the vacuum stops dropping and begins to climb very slowly, continuing until Monday morning (see first attachment).

Tests on the individual water lines show an immediate vacuum response only to the EE lines, the other lines show no response (note the window line is blanked off since the containment box is not on).

With water in the EE lines, the vacuum sits around 1e-6 near the target.

Testing:

Ramped target to 400A and tube to 200A. Sitting there for several hours shows no change in the vacuum response, though there is a variation that corresponds to the chiller turning on and off (see second attachment).

Ramped target to 450A and tube stayed at 200A. Vacuum staying in the low 10^-6 range, seems to be entirely due to EE leak, other seals are holding well.

Ramping up TM4 with new source tray in. Current condition: new source tray but no water running in lines B, D or window. Multipin on the source tray grounded but no lines running into the service tray. Vacuum at 1e-6T.

Small sparks at each BIAS voltage increase starting at 30kV. First real spark around 38kV.

Going up in more than 100V steps causes spikes that take out TP2.

Monday, July 08, 2019, 14:54 : TP2 sparked off at BIAS/EZL = 44kV/25.1kV after 10mins at this point... will leave it here for a couple hours

Monday, July 08, 2019, 16:44 : 6 sparks in last 2hrs, some very strange vacuum response in which the pressure rose steadily and stayed high for 30mins before coming back to normal.

Monday, July 08, 2019, 17:25 : After 30mins at 45kV, started sparking, so will ramp down to 40kV and leave it overnight

Left TM4 at 40kV overnight with no previous heating. There was only one real spark which turned off TP2 but ops turned it back on. Ramping up again.

Tuesday, July 09, 2019, 09:13 : At 45kV the module is sparking on the top pretty regularly. Turned down and David will remove cover and lock out target hall.

Tuesday, July 09, 2019, 16:30 : Went up to 45kV pretty easily now.

Tuesday, July 09, 2019, 16:32 : Everything tripped at 46.5kV. Looks to be a spark outside the vacuum. TM4 sparking much more outside the vacuum than last checks done without the source tray...

Tuesday, July 09, 2019, 16:43 : Everything easy up to 46.8kV, then sparking a bit. Most of the sparks are outside the vacuum. Sitting at BIAS / EZL = 47.1kV / 28kV for a couple mins before ramping down.

Tuesday, July 09, 2019, 16:57 : 10 mins at 47.1kV with not problems. Continuing up still looks like it is really sparking a lot outside the vacuum.