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TY - CONF AU - Lee, S.H. AU - Doran, D.S. AU - Jansma, W.G. AU - Siy, A.E. AU - Sorsher, S. AU - Suthar, K.J. AU - Trakhtenberg, E. AU - Waldschmidt, G.J. AU - Zholents, A. ED - Jaski, Yifei ED - Den Hartog, Patric ED - Jaje, Kelly ED - Schaa, Volker R.W. TI - Mechanical Design of a Compact Collinear Wakefield Accelerator J2 - Proc. of MEDSI2020, Chicago, IL, USA, 24-29 July 2021 CY - Chicago, IL, USA T2 - Mechanical Engineering Design of Synchrotron Radiation Equipment and Instrumentation T3 - 11 LA - english AB - 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. PB - JACoW Publishing CP - Geneva, Switzerland SP - 276 EP - 278 KW - vacuum KW - GUI KW - wakefield KW - quadrupole KW - electron DA - 2021/10 PY - 2021 SN - 2673-5520 SN - 978-3-95450-229-5 DO - doi:10.18429/JACoW-MEDSI2020-WEPB05 UR - https://jacow.org/medsi2020/papers/wepb05.pdf ER -