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@inproceedings{lee:medsi2020-wepb05, author = {S.H. Lee and D.S. Doran and W.G. Jansma and A.E. Siy and S. Sorsher and K.J. Suthar and E. Trakhtenberg and G.J. Waldschmidt and A. Zholents}, % author = {S.H. Lee and D.S. Doran and W.G. Jansma and A.E. Siy and S. Sorsher and K.J. Suthar and others}, % author = {S.H. Lee and others}, title = {{Mechanical Design of a Compact Collinear Wakefield Accelerator}}, booktitle = {Proc. MEDSI'20}, pages = {276--278}, eid = {WEPB05}, language = {english}, keywords = {vacuum, GUI, wakefield, quadrupole, electron}, venue = {Chicago, IL, USA}, series = {Mechanical Engineering Design of Synchrotron Radiation Equipment and Instrumentation}, number = {11}, publisher = {JACoW Publishing, Geneva, Switzerland}, month = {10}, year = {2021}, issn = {2673-5520}, isbn = {978-3-95450-229-5}, doi = {10.18429/JACoW-MEDSI2020-WEPB05}, url = {https://jacow.org/medsi2020/papers/wepb05.pdf}, note = {https://doi.org/10.18429/JACoW-MEDSI2020-WEPB05}, abstract = {{Argonne National Laboratory is developing a Sub-THz AcceleRator (A-STAR) for a future multiuser x-ray free electron laser facility. The A-STAR machine will utilize a compact collinear wakefield accelerator (CWA) based on a miniature copper (Cu) corrugated waveguide as proposed*. The accelerator is designed to operate at a 20-kHz bunch repetition rate and will utilize the 180-GHz wakefield of a 10-nC electron drive bunch with a field gradient of 100 MVm’1 to accelerate a 0.3-nC electron witness bunch to 5 GeV. In this paper, we discuss specific challenges in the mechanical design of the CWA vacuum chamber module. The module consists of series of small quadrupole magnets with a high magnetic field gradient that houses a 2-mm diameter and 0.5-m-long corrugated tubing with brazed water-cooling channels and a transition section. The 45-mm-long transition section is used to extract the wakefield and to house a beam position monitor, a bellows assembly and a port to connect a vacuum pump. The CWA vacuum chamber module requires four to five brazing steps with filler metals of successively lower temperatures to maintain the integrity of previously brazed joints.}}, }