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TY - CONF AU - Navrotski, G. AU - Brajuskovic, B. ED - Casas, Joan ED - Schaa, Volker RW ED - Costa, Isidre ED - López, David ED - Prieto, Montserrat TI - Metallurgical Evaluation of Dissimilar Metal Joints for Accelerator Vacuum Chamber Construction at the Advanced Photon Source Upgrade Project J2 - Proc. of MEDSI2016, Barcelona, Spain, 11-16 September 2016 CY - Barcelona, Spain T2 - Mechanical Engineering Design of Synchrotron Radiation Equipment and Instrumentation Conference T3 - 9 LA - english AB - Tubular vacuum chamber assemblies made of aluminum, copper and stainless steel alloys will be used in the new Multi Bend Achromat (MBA) storage ring that is being developed at Advanced Photon Source (APS). Details of the new lattice magnet system design and ring impedance considerations continue to drive these vacuum chambers to smaller dimensions and thinner walls with tighter geometric tolerances under higher thermal loads. It is important to carefully evaluate the methods used to join these dissimilar metal components looking for compromise in primary strength, permeability, electrical and thermal properties while still creating structures that are ultra-high vacuum compatible and leak-tight. This paper visually details the underlying metallurgical changes that occur when joining various combinations of aluminum, OFE copper, GlidCop® and stainless steel using brazing, bonding and welding techniques. Each of the techniques has its advantages and disadvantages with engineering and economic consequences. PB - JACoW Publishing CP - Geneva, Switzerland SP - 220 EP - 222 KW - ion KW - vacuum KW - ECR KW - interface KW - laser DA - 2017/06 PY - 2017 SN - 978-3-95450-188-5 DO - doi:10.18429/JACoW-MEDSI2016-TUPE25 UR - http://jacow.org/medsi2016/papers/tupe25.pdf ER -