Abstract
In order to use stainless steel piping in an LCLS-II (Linac Coherent Light Source Upgrade) cryomodule, stainless steel to titanium bimetallic transitions are needed to connect the stainless steel piping to the titanium cavity helium vessel. Explosion bonded stainless steel to titanium transition pieces and bimetallic transition material samples have been tested. A sample transition tube was subjected to tests and x-ray examinations between tests. Samples of the bonded joint material were impact and tensile tested at room temperature as well as liquid helium temperature. The joint has been used successfully in horizontal tests of LCLS-II cavity helium vessels and is planned to be used in LCLS-II cryomodules. Results of material sample and transition tube tests will be presented.Operated by Fermi Research Alliance, LLC under Contract No. De-AC02-07CH11359 with the United States Department of Energy.
Highlights
The connection to the two-phase helium line and the cooldown helium supply lines for the dressed cavities within the LCLS-II cryomodule have a transition joint from titanium grade 2 to stainless steel 316L
Similar to the tensile test, one of the samples tested at 4 K, sample 19, broke in the titanium near the joint
Work Explosion welded stainless steel to titanium transitions are planned to be used in the cavity helium vessel assembly for LCLS-II
Summary
The connection to the two-phase helium line and the cooldown helium supply lines for the dressed cavities within the LCLS-II cryomodule have a transition joint from titanium grade 2 to stainless steel 316L. The bimetallic transition tube is machined out of explosion welded material. The material consists of two plates with a very thin layer (0.010” or 0.254 mm thick) of tantalum between the two metals. The. Operated by Fermi Research Alliance, LLC under Contract No De-AC02-07CH11359 with the United States Department of Energy
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