On June 25th the following work was completed:

Optics tray was installed into TM2. The lower fastener on the vertical cable tray (IRH1585) needed to be removed and vertical cable tray rotated upwards as optics tray would not clear cable tray. Optics tray was intstaled, cable tray repositioned and screw re-inserted.

Modified water block for 9 pin connector was installed.

Steerers connected.

Ground Electrode water blocks were "repositioned" closer to there specified position to attempt eliminating the short between the ground electrode line and coil 1 circuit. This was successful but could still use a clamp or other method of ensuring the ground electrode line is in its "proper" place.

9 pin connector line was rerouted to ensure it does not contact anything it is not suppose to (Rerouting directions provided by Anders).

Enzel lens cable was installed.

Blank offs removed from window water lines and new gaskets installed in preparation for installation of the containment box.

Final polish, clean with methanol and clean compressed air.

Loop installed and torqued to 90 in lbs.

Minimum of approximately 1"  between loop and containment box at closest point.

Some issues with the turntable and having to wait for a decision on whether to remove TM2 from the hot cell so that TM4 with dead UCx target could be put in this morning.

Progress on TM2:

• Containment box has been removed from TM2.
• Water block jig has been installed.
• Existing blank off has been removed.
• Sealing surfaces have been inspected.
• First stage of sealing surface cleaning has been performed.

Tomorrow:

• Polish of sealing surfaces.
• Installation of loop.
• Vacuum/helium leak check of loop.

TM2_20141201_03 - sealing surfaces before cleaning...kind of dirty

TM2_20141201_05AC - sealing surfaces after cleaning...looks good!

The TM2 optics tray has been transferred from the source tray to the transfer fixture in preparation for installation of the source tray into the module.

TM2 optics tray is complete.

Master alignment tray: 0 up/down, 0 left/right

Optics tray: Front 0 up/down, 0 left/right. Middle 0 up/down, 0 left/right. Back 0 up/down, 0 left right.

Final assembly and alignment of TM2 optics tray continued today. Front section is "aligned".

A few additional higher-resolution photos of the TM2 source tray with new spacer ITA6270, and bent copper ground line clip.

Also attached is a photo of a 3/8" copper line placed in between the loose ECR line and the Mounting Support Plate line, for dimensional reference.

Hello,

For reference, I have attached a list of all solder joints in the TM2 Source Tray, and the alloys used for the most recent build (as per ITA6144).   I have also provided data sheets for the alloys, and PDF copies of all the drawings calling out the joints.

Certanium 34 C (222 deg C melt point) was used for all low-temperature solder applications, except for the steel inserts in the water blocks.  Previous revisions of the Source Tray drawings called out a higher-temperature McMaster lead-based solder (304 deg C melt point).  The change to Certanium 34 C on the prints was made in Bevan's era, during the transitional update of the source tray drawings between the TM1 and TM3 source tray projects, just before I took over updating the drawing packages.  I believe Bevan made this change on general advice from Guy Stanford, who stated that Certanium 34 C is a much easier solder to work with and makes a more mechanically reliable joint.  However, the change really should have had more review and validation testing before being implemented.

This said, we now have a source tray that uses Certanium 34 C, and rework of every joint would set us back too far in the schedule to meet the deadline, so we will have to run with it as it is.

Of particular concern are the joints on the target oven and coil heating blocks, which are now using a lower temperature solder (222 deg C melt vs 304 deg C melt).  We have experienced a coil block failure on TM4 due to a failed solder joint, although the failure mode is not known for certain.  We also had two recent failures on the test stand of a coil joint soldered with Certanium 34 C, but this was due to an error in the connection of cooling water to the joints (i.e. the joints had no coolant flow and the solder melted... this is expected!).

Anders and I have performed independent thermal analysis on the joints due to the radiative and electric heating from the target, and have concluded that even with a lower temperature solder, there is a lot of margin, so the risk seems to be low.  This work will be published in a separate report to be circulated later.

Thank you and regards,

Grant

Don Jackson brought to my attention some potential HV minimum spark gap issues with the source tray cooling lines.  It appears:

- The gap between the Ground Electrode cooling lines (ground) and Heat Shield cooling lines (HV) does not meet the spec of 0.668" MIN called out on the print

- The gap between the Window cooling lines (ground) and the Mounting Support Plate cooling lines (HV) does not meet the spec of 0.668" MIN called out on the print.

A copy of the tube bending drawing is attached with the spec highlighted in green.

The 0.668" MIN gap spec came from a check I asked Mark Llagan to perform to find the minimum gap when he was preparing the model for the tube bending drawing.  This gap was approved Jan 28th, 2015 by Friedhelm Ames on ECO-3587.

The source tray with the tubes bent as it is currently has been tested to 55 kV at the test stand by Anders, see:
https://elog.triumf.ca/TIS/Test-Stand/447

I am away June 12th to June 24th on vacation inclusive.  Isaac Earle is in charge of Remote Handling in my absence.

I am delegating Don Jackson responsible for resolving this TM2 HV issue, collecting and documenting the approval to proceed from the T/IS group leader with the source tray as-is, or to try to re-work the cooling lines and delay the project.

The source tray is NOT to be installed in the Hot Cell until this issue has been resolved.

Regards,

Grant

-- 
Grant Minor, M.A.Sc., P.Eng.
TRIUMF Remote Handling Group Leader
Nuclear Engineer
4004 Wesbrook Mall, Vancouver
BC, Canada, V6T2A3
gminor@triumf.ca
(604) 222-7359(604) 222-7359
http://www.triumf.ca/profiles/4557

Nb#10 has been installed on TM2 . electrical and leak check on HS line are good. See attachment.

TM2 was moved from ITW to the Conditioning Station.

TM2 was moved with no target attached from the South Hot Cell to a silo.

TM2 was moved from ITW to the South Hot Cell with Ta#66 target.

TM2 was moved from ITE to South Hot Cell. Tantalum 58 target.

TM2 was moved from South Hot Cell to ITE. ZrC #8 target.

TM2 has been moved from the Conditioning Station to ITE with Ta#59 target.

TM2 was moved from the Conditioning Station to ITE, with SiC#38 target.

The MK4 optics tray prepared for TM2 (as per ITA6082) had an undersized bore for the banana plug, making insertion of the plug extremely difficult / impossible.

Reference stores parts were collected to check the fit:  male plug 3-4/01152 and female jack 1-6/1201.  The size of the female jack was checked with a #21 drill at .159".

The bore on the optics tray was drilled out dry using the #21 drill to the same depth as the original blind hole, by Maico and Dan McDonald.  Chips were carefully collected in a rag, and the hole was blown out with compressed air.

The fit was checked to be snug but possible, using the male plug and the Remote Handling ultem base (ref ITA6023).

Redlines and photos are attached.

conductor insulators itd0053 and 54 have been replaced on TM2. All fasteners (1/4-20 x 1 1/4 vented) torqued to 60 in lbs.

Broken insulators ITD0053 and ITD0054 have been uninstalled from TM2.