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

5 shielding blocks have been transferred from ITE to ITW. I  checked all ITW water signals, and they are good.  ITW is configured to take proton beam.

TM2 has been successfully de-shuttered.

All went pretty much according to plan except I had to remove one fastener out of the upper wiring harness (the one that has just been installed) to allow for enough clearance to rotated the shutter guide out of the way...I shutter to think what would have happened otherwise...anyways...

Close inspection of the shutter does show that the "thin" area isn't in very good shape; whether this is a result of removal or just the way it was is hard.Due to the ease of removal I would quess that it may have been a preexisting condition. That being said...I think we may want to consider replacing it.

The schedule has some changes due to  new TM2 source tray coil cooling line leaking at test stand. Now,It is re-scheduled in such an estimation  that TM2 source tray could be ready at teat stand by this Friday(May-15th). see attachment 1,2.

2015-05-12,  Changed  and updated the TH activity schedule according to Dons new beam schedule which is re-arranged after the coil line leaking issue. See attachments 3,4. No major conflicts has been found on the new schedule.

2015-05 25, Updated the TH activity schedule according to present TM2 job processing. See attachment 5,6.

 The communications chip has been replaced. The electronics box has been grounded (see attached pdf).

Wires in TM#2 have been terminated at the top of the module.

Wires for TM#2 steering elements, and png gauge have been run down to the containment box level. Chad has placed them in the little cable trays. Slack has been pulled back. and termination of the wire will be done on the 7th of May. A modification was done to the signal line of the png gauge wire ultem block, as grounded screw was inserted to allow for strain relief so the end would hopefully quit breaking. See attached pictures for the details.

Old wiring was removed yesterday, new wiring run thru the vacuum chase. Old IMG gauge removed today, new cable trays installed and wires installed into cable trays.

Caled cyclotron ops to open P23 and confirmed penthouse valve open.

Filled up TK2 to 21 in water leve.

Target Hall Scheduled Activities  April 07 - June 26  2015 update.      2015-05-01. All TH scheduled jobs are finished on time this week.

Containment box has been removed in preparation for wire replacement.

TM#2 with no source tray has been moved from the north east silo to the south hot cell.

TM1 has been connected in ITW. Five turbo pumps have  been started. The TM1 containment box window line is capped on the service cap and the line is pump town to E-4 torr range.

TM#1 with UC#12 has been moved from the conditioning station to the west target station.

The new TBHT and TGHT power supplies were brough up to high current; 350 A and 420 A respectively. The TGHT power supply was limited by PLC to 420 A. The resistance calculated for both the TBHT and TGHT copper lines from the electrical services room to the ITW pit was 1.35 mOhm. See attached spreadsheet for details.

Dave Morris has been contacted to correct the current limit for the TGHT supply to 600 A.

Dan and I replaced ITW target pit o-ring seal(.275DIA X42"ID). It is an annual job before first beam to ITW. The old o-ring was moved and the groove was vacuum cleaned. The new o-ring has been installed properly.

Dan and I vented CS and TM1 with Argon gas before it is moved this morning.

The water blocks soldered to the TM2 cooling lines (see Ref. Assy. ITA6144) were inspected.

See attached inspection reports and drawings.

It was found that only 18% of the seal groove diameters and 55% of the depths were in spec.

The source tray must be tested on the test stand with c-seals to ensure that these blocks will seal properly on the module.

On drawing ITA6008 for the Encole 0.5" ceramic standoffs there is a note to match pairs of ceramics to within +/-0.001". This step was missed on the current build of TM2 source tray (ceramics were not measured).

Measured the lengths of the rest of the ceramic standoffs in inventory and they range from 0.5035" to 0.4950" in length. The ceramics have been sorted by length and grouped into bags.

TM1 has been partially disconnected at CS for tomorrow move. The CS TP1S is still running and will be stopped and disconnected tomorrow morning.