Yesterday a bottle of Cava (sparkling wine) was place, opened, and poured in the NHC, to commemorate its new operational status.

The NHC is now a functional hot cell and is ready for many years of target exchanges to come.

NiO#2 has been removed from TM3

NiO#1 was removed this morning.

UCx#5 was inserted into the hot cell around 1 pm, installed and leak checked and ready to go to the conditioning station 1:40pm

did have a little trouble with the 9 pin connector. It had to be lossened to get it to mate properly. It was le-tightened once the proper fit was achieved.

New wiring was installed yesterday as well as ZrC#7 which had its high current fasteners torqued to 130 in lbs.

 Controls has created a new user group that can operate the conditioning station but cannot use any of the bypasses or forces. The cooling package will be used to test this new profile. The main loop bypass has been opened to allow this testing to happen without the risk of over pressure.

Ta#36 has been installed on TM4 and is awaiting leak and electrical check.

A small piece of the standard top insulator ITA3376 broke off during removal of Ta#35 (indicated with a blue circle on attached pictures).

"JP's connector, ITA2493 showed the usual and as yet undiagnosed "arc" mark (picture to follow).

The plastic retainers on the new torqtite gaskets showed rad damage.

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.

Inspected new high current flexible cables during TM4 disconnection. The new cables and adapters work fine.

The new gas bottle storage rack has been installed by/for the south hot cell.

I installed 8 new bolts(3/8-16 UNC x1.25  STL) on the ITE TP3. The ITE TP3 replacement job is done. Everything is connected back to the pump. and it is ready for starting.

After bending and leak checking the new measurements from ground to HV on the TM2 source tray are:

Ground to C1+ 0.6645"

ground to heat shield 0.506

Window to mounting support plate - unchanged - over 0.80"

Adrian and co installed a new T to be able to add an instrument loop for O2 and pH monitoring on the low conductivity water systtem (photo). See WP I2021-04-09-4

Arthur installed a new Magna Power PS for the TGHT yesterday. The old power supply has been moved to Evaporator 2. The power supply was configured for remote operation and tested successfully with low current (30 A).

The waterline loop bracket has been installed onto the new loop holding bracket and both installed onto the new source tray.

New IGLIS cables installation is done. Two bundle of new cables are pulled from ITE to electrical room. They are in one PVC conduit. The old cables are not removed yet. I will pull old cables out when new cables are installed onto device in ITE Faraday cage.

Attached are pre-removal pictures of NB#7 and the inside face of the containment box cover before cleaning.

Nb#7 was dismantled and ready for inspection.

Nb#10target has been remotely  transferred from NHC to SHC. 

Nb#10 never worked online - repeller had no effect on the beam and one of the RF wires was touching HVC. Max 60pA was seen on the source cup. See notes here ITW-TM2-Nb#10/#11-LP-IGLIS  (Web view)

Target was handled roughly after use - kicked around in NHC for a long time, then loaded into a pail (multipin had to be dettached for this) then moved to SHC, unloaded from pail, then plates covering the RF electrodes had to be pried off. Lots of knocking and shaking.

Theory was that the repeller wire was disconnected. But found it not obviously broken, had good continuity from the ring tongue to the end of the wire pulled out of the multipin, even after all the abuse. Same for the RF (from the end of the electrode to the end of the wire pulled out of the multipin). Did find some of the multipin wires were flaky - if moved around they showed intermittent shorts to HVC. But not clear if this is from the rough handling afterwards or not. The problem was not in the module since NB#11 ran immediately afterwards with no issues. Most likely culprit seems to be the insulation beads on the wires. Should look for more robust insulation solutions. On the other hand, the connections of the wires to the electrodes seems very good.

Still not sure why no effect of the repeller was seen. Could be a intermittent break/short, though this seems unlikely. Maybe the connection in the multipin was not good? I did not get a chance to inspect that.

Nb #7 was installed and tested today.

Inside face of the containment box cover was cleaned with methanol and a baseline picture taken in an effort to track deposits and marking as requested bty Anders.