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SCU R&D Status UpdateLawrence Berkeley National LaboratoryJuly 6th, 2015Soren Prestemon
Present Status:
Progress slowed in June as additional funding was sought to complete the project. Some critical efforts were nevertheless maintained throughout June. Most importantly progress was made on the tuning system (see Fig 1): the epoxy gluing of the tuning elements to the vacuum chamber was refined and thoroughly tested with shock tests at liquid Nitrogen temperature. A key element turned out to be the Aluminum surface; we found that the surface cleanliness is critical for reliable epoxy adhesion at low temperature. We are now fabricating and testing a prototype full section of tuning loops. Once tested at cryogenic temperature, we will proceed with the final tuning system installation on the vacuum chamber that has been provided by ANL.We have also proceeded with finalizing a short prototype that will allow us to validate voltage tap layout, the potting procedure, and magnet test procedures. The short prototype has been wound, reacted, and joints fabricated. Tooling is ready for vacuum impregnation of the short prototype. Funds have now been identified (in late June) and work is proceeding. The LHe elbows have arrived from the vendor, and the remaining miscellaneous components are being fabricated in-house. Figure 1 Example test setup for the tuning system.
The short sample measurements of witness samples placed in the furnace with the long coil during reaction, and described in the previous report, have been analyzed. The measured data is shown in Fig. 2.
Next steps:Focus is now on the following fronts:
1) Finalize the detailed work plan for project completion. The plan will be reviewed by LBNL Engineering staff to validate the schedule and cost estimate.
2) Validate the fabrication procedures for the long coils, including voltage tap layout and magnet protection, through demonstration on the short prototype.
3) Proceed with final processing of the long coils.
Figure 2. Short sample measurements of a Nb3Sn witness sample subjected to the heat-treatment of the first long coil. Field sweeps indicate that the conductor is stable in the operating field regime, and that the current density is as anticipated in the undulator.