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​A New 2K Superconducting Half-Wave Cavity Cryomodule

​July 29, 2015
One of the great things about being in the business of building unique equipment in support of Basic Science is that you get to learn how the component or assembly you’ve built is used in the greater scheme of the experiment or project. In the case of the PIP-II project (Proton Improvement Plan–II) Meyer Tool has recently delivered one key component and is working on completing two other key components of this effort.

Argonne National Lab (ANL) and Fermilab are collaborating in the design and fabrication of the first 2K cryomodule for superconducting accelerator cavities with low-beta (cavities that accelerate particles at less than half the speed of light) for PIP-II. The attached presentation given by Dr. Zachary Conway of ANL was presented at the recent Cryogenic Engineering Conference. It is reprinted with Dr. Conway’s gracious permission. It highlights the design features and performance goals if this new cryomodule.

Meyer Tool recently delivered the large rectangular Cryomodule Assembly for this effort. The Cryomodule Assembly consists of a stainless steel rectangular vacuum vessel (78.25” x 246.97” x 54.25” tall) with a reinforced flat Top Plate. The interior wall of the vacuum vessel was lined with magnetic shielding. A 70K aluminum thermal shield, with mechanically attached LN2 trace tubing fit within the vessel. Both sides of the thermal shield were insulated with superinsulation. The Top Plate interior surface was also lined with magnetic shielding and a 70K aluminum superinsulated thermal shield with LN2 trace tubing.

Meyer Tool is presently working on two other aspects of the Cryomodule Assembly.

We are jacketing with a stainless steel pressure boundary eight Half Wave Resonator superconducting RF cavities. These uniquely shaped cavities made from niobium are surrounded by a stainless steel pressure boundary to contain the liquid helium used to cool and maintain the cavities at superconducting temperatures. These jackets are designed to meet all the required safety requirements of the Department of Energy, Argonne National Lab, and Fermilab. They are however not ASME Code stamped.

Meyer Tool is also jacketing with a stainless steel pressure boundary eight superconducting solenoid magnets. Once again we build a jacket, this time around the magnet, to contain the liquid helium that maintains the device at superconducting temperatures. In this case the jackets are ASME Code stamped.

Support of exciting new Basic Science projects like PIP-II is just one aspect of Meyer Tool’s specialization in cryogenic, vacuum and pressure technologies. We also support industrial partners with our commitment to achieving the lowest total cost of ownership through our Reduce Project Risk process.

​If you’re interested in learning more about the PIP-II project we have a great article that was recently published in Cold Facts by the Cryogenic Society of America for you to read. Meyer Tool has a strong connection to this article as two of the photos in the article contain parts we worked on! In the photo of the 650 MHz cavities designed by Fermilab we have been enclosing the niobium cavities in the stainless steel pressure jackets to contain the liquid helium that maintains the cavity at superconducting temperatures; the jackets and welds were designed to Division 2 of the ASME Section VIII Code. The lower picture shows the first of nine Half Wave Resonator Cavities mentioned in Dr. Conway’s presentation. Meyer Tool is also jacketing these niobium cavities with stainless steel pressure jackets to contain the surrounding liquid helium. These jackets were designed to Division 1 of the ASME Section VIII Code. Meyer Tool supplies all the pressure jacket components (except the bellows) welds and final machines features on the pressure jackets after welding. The 650 MHz cavity assemblies are pressure and helium leak tested. The HWR cavity assemblies are helium leak tested.

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