The repair/cable replacement on the east manipulator is now complete.

Yesterday's initail cable replacement went very well however, due to a minor glich, we were unable to test the tong movement until I was out of the hot cell. Tong did not fully close and felt like there was a "hard stop" at a repeatable spot in the  closing of the tong. Upon further investagation, I determined that the problem was definelty on the slave side.

I conducted a troublshooting exercise this morning to narrow down the problem. I quickly found that the new tong came from the manufacture with two incorrect fasteners (socket head cap screws) instead of set screws. As a result the tong was being kept from closing as the head of the socket head cap screws was interfering.

I replaced the SHCS was the set screws from the old tong. The tong now functions with full range of motion.

Jan. 15, 37 minutes in cell .26 mSv

Jan. 16, 16 minutes in cell (as I did some clean up of compressable waste) .05 mSv

Also, the inital repair utilized a prototype tool I designed (and with assistance from Maico, built). This tool made the repair much easier. I will be making small improvements to the design and issuing drawings to the vault and shop.

I have managed to reduce the field at the broken manipulator from 12 mSv/h to 400 uSv/h.

While under vacuum Travis and I completed diagnostics of the HV chase. Majority of the lines showed OL at 1kV but there were the following "failures"

A to P @ 250V 716kOhm
A to Q @ 1kV 25.18MOhm
B to C with ohm meter 8Mohm @250V 830kOhm
B to D @ 1kV 15.57MOhm
C to D @1kV 16.18 MOhm
P to Q @1kV 1.069 GOhm
G to J with ohm meter dead short.

Ideally all of these values would be OL and they may improve or get worse when the source tray is installed depending on where the electrical contact is. I need to discuss with Friedhelm but I believe that as these values the module can still operate. Without changing the HV chase there is very little chance of improving these values.

I moved 5 shielding blocks to ITE. The ITE is configured to take proton beam.

The spent Ta#41 target has been moved from the south hot cell to the spent target storage vault. It is an unnumbered pail (should be pail 112) and placed in spot 7A of the vault it had a reading of 536mSv/hr upon removal from the south hot cell. See attached PDF for vault details.

Today 55kV was applied to TM2 and held for over 1 hour with the EINZEL at 27.5kV. There were 2 sparks and the current was unstable at this voltage but this test should be considered a success. Once again while bringing the voltage up the canbus continued to be a problem. After successfully passing the test I continued to raise the BIAS and EINZEL. A spark at 57kV tripped a controller for the vacuum and the canbus. As stated before I believe the module will reach 60kV and that there is an interaction between the EINZEL and the BIAS. I am not certain if that interaction is internal or external to the module. Attached is a screen shot and the dumped data.

I connected TM4 in ITE. All turbo pumps have been started and wok fine including new TP3. Everything is good so far.

Chad and I leak checked TM4 heat shied water circuit at SHC. The pumping down was very good.Base leak rate 0.0xe-9 atm.cc/sec. BP 0.0xe-4torr. Sprayed helum twice on both VCR fittings.There is no response on leak detector.  The circuit is leak tight.

Electrical check was done on TM#4 without a target and with the UC#8 target on see attached PDF for results.

TM#4 with UC#8 has been moved from the south hot cell to the east target station.

Electrical check of TM#4 with Ta#41 post beam at the south hot cell. See PDF for details

Ta #47 has been removed from TM4.

One containment box cover bolt would not come out. Upon attempted removal with the stud remover the bolt sheared...which is not uncommon...just hasn't happened in many years...CBB being stuck or shearing.

Nine pin connector shows the typical "arcing" mark.

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.

I disconnected TM4 in ITW .The job took about 20minutes and I got 0.11 msv dose.

TM#4 with Ta#41 has moved to the south hot cell, the move it self was uneventful but, the fields on the module are extremely high when lowering it down into the south hot cell the module had a maximum field of about 392mSv/hr. The shield plug was also installed remotely as well due to the 12mSv/hr field at the top of the west target station due to shine from the dump.

 It was attempted to HV condition TM2 to 55kV and leave it operating there for an hour to demonstrate stability. Unfortunately at 52.65kV a spark destroyed the canbus controller. This controller had shown issues in the past but seemed to magically fixed itself. I will contact Hubert for another card. Attached  is is a screen shot of the stip tools. 

The blocks have been removed from the west target station. The fields at the top of the target pit at the railing at waist level is about 80uSv/hr, Turbo pumps are about 805uSv/hr, backing lines for the turbos about a 1mSv/hr and the average field in the area of work down in the pit is about 600 to 750uSv/hr. The proton beam went off at 10:45 on December 2nd, these measurements were done at 09:00 on December 3rd.

Another set of field measurement was done at the west target station. At the top of the west target station at the railing the field ranged from 50 to 70 uSv/hr. The turbo pumps had field of about 650uSv/hr, the area over the dump was about 750uSv/hr, the area over the HV cover and the south side was about 450uSv/hr. These measurements were done at 13:15 on December 3rd.

I moved 5 shielding blocks from ITW to block storage area.

TM#3 with no target has been moved from the south hot cell to the northeast silo.

Using in cell camera and transit the suspect line on the steerers was inspected as best as possible. An existing photo of the complete steerers before installation was used for comparison. The wiring and beading inspected today showed no obvious problems, breaks or spots where there may be a short. In comparison to the photo from construction, what we could see of the steerers looked identical to the original installation.

chad fisher wrote:

Using in cell camera and transit the suspect line on the steerers was inspected as best as possible. An existing photo of the complete steerers before installation was used for comparison. The wiring and beading inspected today showed no obvious problems, breaks or spots where there may be a short. In comparison to the photo from construction, what we could see of the steerers looked identical to the original installation.

 The test was repeated to confirm that there was a short.