TM#4 has been moved from the south west silo to the south hot cell.

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

 TM4 has been moved from the conditioning station to the south west silo. Module was placed with the turbo pump facing south which puts the windows facing north and south and the shutter facing west. 

 TM#4 has been moved from the south west silo to the south hot cell.

 TM#3 has been moved from the south west silo to the conditioning station.

 TM#3 has been moved from the conditioning station to the centre east silo.

 TM#4 has been moved from the silo to the south hot cell.

 TM#2 with no target has been moved from the south west silo to the south hot cell.

 TM#3 has been moved from the silo to the conditioning station, where David and Frank will start on the gutting of the module.

 TM#3 has been moved from the conditioning station to the silo.

 The West Entrance module has been moved to the south hot cell for repairs.

 TM#3 is now in the south hot cell.

 TM#2 has been moved from the SHC to the NHC.

 TM#2 with targets nSiC#1 (old target) and UC#25 (new target) electrical check results. See attached for details.

 TM#2 with the nSiC#1 target had its check done on it at the south hot cell see attached for results.

 TM#2 with nSiC#1 has been moved from the south hot cell to the west target station.

On September 18th installation of nSiC#1 was attempted on TM2. As usual, new fasteners were tested previous to insertion into hot cell and employed during installation. the last fastener to be installed was for the circuit D block. The fastener/air ratchet stalled immediately indicating a problem. The fastener was removed and a an attempt was made trying a new spare fastener. That fastener also jammed right away but could not be removed or installed any further.

A breaker bar was employed to achieve more torque and the fastener was able to be loosened, although it would not come completely out, dangling and wobbling like it was free. A claw type bar was used to add slight pressure to the fastener while it was loosened allowing the fastener to undo the rest of the way.

Target was removed and discovered that that insulator supporting circuit c and d blocks was quite broken and that a few chunks had fallen off. It was also notice that boefore the breaker bar had been employed that a piece of ceramic was on the table suggesting that the ceramic had been at least partially broken at the time of removal of the previous target. Also, the threads of the insert for circuit d showed damage an swarf.

Swarf was vacuum claned out of the circuit d thread insert and a machine tap ran through the insert twice.

nSiC#1 was reinstalled with new waterline gaskets and new c and d circuit fasteners with a little bit of the first 2-3 threads lightly coated with vacuum grease.

High current fasteners torqued to 130 in lbs.

 Modules were moved, ITW EX2 was moved from the conditioning station to the west target station and TM#2 ,with nSiC#1,  was moved from the west target station to the south hot cell.

 The spent nSiC#1 target has been moved from the south hot cell to the spent target vault. It was placed in pail #172 and placed in spot 7B. See attached PDF for vault details.

On May 30 Aaron, Chad and I removed the empty LP FEBIAD target from the SHC into the anteroom to attempt to find out the source of the cathode short observed online. The behaviour online was that a connection of several hundred ohms was preventing the cathode from being biased. The resistance was still enough to allow us to run in anode mode, which is what we did. I am not sure where the cathode short came from but there was significant sparking on this module when ops conditioned it (destroyed the gmov of the COIL power supply and the electronics for anode/cathode switching) and we have seen this cause cathode shorts before. The shorted behaviour did not go away when the target was cooled down, so I assume it was permanent damage to one of the insulators. This would be either the support insulator, the trident insulator, the gas line insulator or one of the tube retainer insulators.

Since the target didn't see protons, we decided to take it out of the hot cell and disassemble it to find which insulator was broken. Unfortunately, it appeared totally fine outside of the hot cell, no shorts could be found. We disassembled it anyway to look for issues but all we saw was a heat mark on the copper plates covering the coil, underneat the target (see attachment). We even shook the target quite a bit, and didn't produce a short.

Maybe there was a trace created on one insulator by the sparking, which oxidized when exposed to air and became insulating again? We didn't see anything obvious on the insulators, but I'm not sure if we would expect to.

No conclusions from this work.