Superconducting Undulator (SCU) R&D for Free-Electron Laser (FEL) Systems (Argonne)

Highlights – November 01-30, 2014

All cryostat components have been received from PHPK. Cryocoolers were delivered by Sumitomo.

SCU and Test Cryostat - Undulator Fabrication:

1. The three 1.5-meter magnet core assemblies are being fabricated at Hi-Tech.

2. The cold mass support frames were ordered. Procurement of two frames enables cold-mass assembly to take place independently at Argonne and Berkeley.

3. Test pieces of the newly-designed flexible links for the 500A and 100A feed-throughs were delivered and are being tested.

4. Additional current lead components have yet to be ordered pending final design completion. Final design is at 90% and will be complete next month.

Drawings and Models:

The updated cold-mass model is shown in Figure 1.

1) Overall, the models and drawings are more than 96% complete. 2) The magnet potting fixture is under review; a design change was implemented for

manufacturing simplification. 3) The 20K thermal bus bar is 97% modeled. Drawings are at 95%, pending

implementation of minor modifications for LBNL’s magnet. 4) Beam chamber: models 95%, drawings 95%.5) Miscellaneous components: models 90%, drawings 90%.6) Design work on current lead turret assemblies is ongoing.

Figure 1: The coldmass model is shown.

Measurement System Fabrication:

1. The 2.5-m linear stage for vertical cryostat measurements was delivered. 2. The following items are unchanged since the September report:

i) Drawings for small fixtures for the interface from the cryostat top-plate to the linear stage are almost complete.

ii) The small ceramic Hall probe holders that will be mounted inside carbon-fiber tubes are in-house, and will soon be sent to Arepoc for installation of the Hall sensors. After we receive the mounted Hall sensors we will begin to build two 2.8-m-long carbon-fiber Hall probe assemblies.

iii) A 5-mm OD titanium guide tube for the horizontal cryostat system and other minor parts still need be ordered.

iv) Estimated completion of the measurement system is now around March 2015. While later than scheduled, the measurement system is not on the critical path.

Test Cryostat Fabrication:

Helium Reservoir:

The Liquid Helium reservoir tank was delivered, and is shown in Figure 2. Acceptance tests are ongoing at Argonne.

Figure 2: The liquid He reservoir tank is shown in the Argonne SCU assembly area.

Cryostat vacuum vessel and thermal shield components:

All cryostat components ordered from PHPK have been received at Argonne. Site acceptance was performed at PHPK by Argonne staff, as shown in Figures 3 and 4. Delivered components are shown in Figures 5 and 6. Cryocooler delivered components are shown in Figure 7.

Figure 3: Trial fit of the thermal shields into the vacuum tank at PHPK, witnessed by Argonne.

Figure 4: Trial fit of the shields into the vacuum tank at PHPK.

Figure 5: LCLS-SCU cryostat components at Argonne – the vacuum vessel is shown in the foreground.

Figure 6: LCLS-SCU cryostat components at Argonne – thermal shields are shown in the foreground.

Figure 7: LCLS-SCU cryocoolers have been delivered from Sumitomo and are in the assembly area at Argonne.

Issues and Actions

• Working to recover schedule where possible.

Schedule Status

The schedule status remains as it was in September.

90-day Forecast

• 8 Km of 0.7-mm NbTi conductor will be delivered• 4K cold mass models and drawings will be complete. • Cores will be delivered from the vendor, and magnet production will be underway.• The cold mass support frames will be delivered.• Acceptance of PHPK delivered components by Argonne will be complete. • Acceptance of the liquid helium reservoir tank by Argonne will be complete.