Author: Lu, X.
Paper Title Page
MOPA74 Design of a W-Band Corrugated Waveguide for Structure Wakefield Acceleration 210
  • B. Leung, X. Lu, C.L. Phillips, P. Piot
    Northern Illinois University, DeKalb, Illinois, USA
  • D.S. Doran, X. Lu, P. Piot, J.G. Power
    ANL, Lemont, Illinois, USA
  Current research on structure wakefield acceleration aims to develop radio-frequency structures that can produce high gradients, with work in the sub-terahertz regime being particularly interesting because of the potential to create more compact and economical accelerators. Metallic corrugated waveguides at sub-terahertz frequencies are one such structure. We have designed a W-band corrugated waveguide for a collinear wakefield acceleration experiment at the Argonne Wakefield Accelerator (AWA). Using the CST Studio Suite, we have optimized the structure for the maximum achievable gradient in the wakefield from a nominal AWA electron bunch at 65 MeV. Simulation results from different solvers of CST were benchmarked with each other, with analytical models, and with another simulation code, ECHO. We are investigating the mechanical design, suitable fabrication technologies, and the possibility to apply advanced bunch shaping techniques to improve the structure performance.  
poster icon Poster MOPA74 [1.518 MB]  
DOI • reference for this paper ※ doi:10.18429/JACoW-NAPAC2022-MOPA74  
About • Received ※ 30 July 2022 — Revised ※ 03 August 2022 — Accepted ※ 07 August 2022 — Issue date ※ 26 August 2022
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TUPA28 Update on the Development of a Low-Cost Button BPM Signal Detector at AWA 409
  • W. Liu, G. Chen, D.S. Doran, S.Y. Kim, X. Lu, P. Piot, J.G. Power, C. Whiteford, E.E. Wisniewski
    ANL, Lemont, Illinois, USA
  • E.E. Wisniewski
    IIT, Chicago, Illinois, USA
  Funding: Work supported by the US Department of Energy, Office of Science.
A single-pulse, high dynamic range, cost-effective BPM signal detector has been on the most wanted list of the Argonne Wakefield Accelerator (AWA) Test Facility for many years. The unique capabilities of the AWA beamline require BPM instrumentation with an unprecedented dynamic range, thus a cost-effective solution could be challenging to design and prototype. With the help of a better circuit model for a button BPM signal source, we are able to do the circuit simulations with more realistic input signals and make predictions much closer to realities. Our most recent design and prototype results are shared in this paper.
DOI • reference for this paper ※ doi:10.18429/JACoW-NAPAC2022-TUPA28  
About • Received ※ 01 August 2022 — Revised ※ 08 August 2022 — Accepted ※ 11 August 2022 — Issue date ※ 09 October 2022
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WEYD4 Design and Fabrication of a Metamaterial Wakefield Accelerating Structure 564
  • D.C. Merenich, X. Lu
    Northern Illinois University, DeKalb, Illinois, USA
  • D.S. Doran, X. Lu, J.G. Power
    ANL, Lemont, Illinois, USA
  Metamaterials (MTMs) are engineered materials that can show exotic electromagnetic properties such as simultaneously negative permittivity and permeability. MTMs are promising candidates for structure-based wakefield acceleration structures, which can mitigate the impact of radio frequency (RF) breakdown, thus achieving a high gradient. Previous experiments carried out at the Argonne Wakefield Accelerator (AWA) successfully demonstrated MTM structures as efficient power extraction and transfer structures (PETS) from a high-charge drive beam. Here we present the design, fabrication, and cold test of an X-band MTM accelerator structure for acceleration of the witness beam in the two-beam acceleration scheme. The MTM structure design was performed using the CST Studio Suite, with the unit cell and the complete multi-cell periodic structure both optimized for high gradient. Cold test of the fabricated structure shows good agreement with simulation results. Future work includes a beam test at AWA to study the short-pulse RF breakdown physics in the MTM structure, as an important component towards a future compact linear collider based on two-beam acceleration.  
slides icon Slides WEYD4 [2.322 MB]  
DOI • reference for this paper ※ doi:10.18429/JACoW-NAPAC2022-WEYD4  
About • Received ※ 03 August 2022 — Revised ※ 09 August 2022 — Accepted ※ 10 August 2022 — Issue date ※ 31 August 2022
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