Keyword: acceleration
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MOPA46 Cryogenic Dielectric Structure with GΩ/m Level Shunt Impedance impedance, cryogenics, simulation, accelerating-gradient 157
  • R.A. Kostin, C. Jing
    Euclid Beamlabs, Bolingbrook, USA
  Shunt impedance is one of the most important parameters characterizing particle acceleration efficiency. It is known that RF losses are reduced at cryogenic temperatures. For example, a record high shunt impedance of 350 MΩ/m was demonstrated recently for all metal X-band accelerating structure, which is more than 2 times higher than that at room temperature. In this article we present a novel hybrid dielectric structure which can achieve even higher shunt impedance due to the fact that losses in dielectric materials reduced much more than in pure copper.  
DOI • reference for this paper ※ doi:10.18429/JACoW-NAPAC2022-MOPA46  
About • Received ※ 12 August 2022 — Revised ※ 16 August 2022 — Accepted ※ 23 August 2022 — Issue date ※ 17 September 2022
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MOPA74 Design of a W-Band Corrugated Waveguide for Structure Wakefield Acceleration wakefield, GUI, electron, accelerating-gradient 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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TUZD3 Ultimate Limits of Future Colliders collider, luminosity, electron, factory 321
  • M. Bai
    SLAC, Menlo Park, California, USA
  • V.D. Shiltsev
    Fermilab, Batavia, Illinois, USA
  • F. Zimmermann
    CERN, Meyrin, Switzerland
  With seven operational colliders in the world and two under construction, the international particle physics community not only actively explores options for the next facilities for detailed studies of the Higgs/electroweak physics and beyond-the-LHC energy frontier, but seeks a clear picture of the limits of the colliding beams method. In this paper, we try to consolidate various recent efforts in identifying physics limits of colliders in conjunction with societal sustainability, and share our thoughts about the perspective of reaching the ultimate quantum limit.  
slides icon Slides TUZD3 [3.848 MB]  
DOI • reference for this paper ※ doi:10.18429/JACoW-NAPAC2022-TUZD3  
About • Received ※ 25 July 2022 — Revised ※ 03 August 2022 — Accepted ※ 10 August 2022 — Issue date ※ 30 August 2022
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TUPA85 First Results from a Multileaf Collimator and Emittance Exchange Beamline wakefield, plasma, laser, vacuum 531
  • N. Majernik, G. Andonian, C.D. Lorch, W.J. Lynn, J.B. Rosenzweig
    UCLA, Los Angeles, California, USA
  • D.S. Doran, S.Y. Kim, P. Piot, J.G. Power, C. Whiteford, E.E. Wisniewski
    ANL, Lemont, Illinois, USA
  Funding: Department of Energy DE-SC0017648 and National Science Foundation PHY-1549132.
By shaping the transverse profile of a particle beam prior to an emittance exchange (EEX) beamline, drive and witness beams with variable current profiles and bunch spacing can be produced. Presently at AWA, this transverse shaping is accomplished with individually laser-cut tungsten masks, making the refinement of beam profiles a slow process. In contrast, a multileaf collimator (MLC) is a device that can selectively mask the profile of a beam using many independently actuated leaves. Since an MLC permits real-time adjustment of the beam shape, its use as a beam mask would permit much faster optimization in a manner highly synergistic with machine learning. Beam dynamics simulations have shown that such an approach is functionally equivalent to that offered by the laser cut masks. In this work, the construction and first results from a 40-leaf, UHV compatible MLC are discussed.
DOI • reference for this paper ※ doi:10.18429/JACoW-NAPAC2022-TUPA85  
About • Received ※ 16 July 2022 — Revised ※ 02 August 2022 — Accepted ※ 11 August 2022 — Issue date ※ 12 August 2022
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WEYD4 Design and Fabrication of a Metamaterial Wakefield Accelerating Structure wakefield, simulation, experiment, flattop 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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