Bulletin of the American Physical Society
APS April Meeting 2023
Volume 68, Number 6
Minneapolis, Minnesota (Apr 15-18)
Virtual (Apr 24-26); Time Zone: Central Time
Session U16: Accelerator Technologies |
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Sponsoring Units: DNP Chair: Deepa Thomas, University of Texas at Austin Room: Marquette VIII - 2nd Floor |
Tuesday, April 18, 2023 1:30PM - 1:42PM |
U16.00001: Advanced accelerators for high energy physics and Snowmass AF06 Cameron R Geddes, Mark Hogan, Pietro Musumeci, Ralph W Assmann New R&D concepts for particle acceleration, generation, and focusing at ultra high acceleration gradients (GeV/m and beyond) have the potential to enable future e+e- and gamma-gamma colliders to and beyond 15 TeV energies. In addition to proven high gradient and ultra-bright beam generation, these systems have the potential to increase luminosity per unit beam power via short beams, for practical energy recovery to extend the reach of high energy physics, and for fast cooling. They hence have potential to reduce the dimensions, CO2 footprint, and costs of future colliders, with added potential to reduce power consumption. The last decade has seen tremendous experimental progress in performance, together with development of concepts to address potential collider issues. Conceptual parameter sets for colliders have been developed for e+e- and gamma-gamma colliders at a range of energies, which present potentially competitive options with prospects for future cost reduction. In addition to a strengthened ongoing R&D program, continuing to develop these collider concepts in interaction with the collider and high energy physics communities, starting with an integrated set of parameters, is important; as is development of technologies through nearer-term applications. Progress in these concepts, next steps, and results of Snowmass Accelerator Frontier topical group # 6, Advanced Accelerator Concepts (https://doi.org/10.48550/arXiv.2208.13279) will be discussed. |
Tuesday, April 18, 2023 1:42PM - 1:54PM |
U16.00002: Distributed Coupling Linac for Efficient Acceleration of High Charge Electron Bunches Ankur Dhar, Zenghai Li, Glen White, Mei Bai, Emilio A Nanni, Mohamed A Othman, Sami Tantawi Future colliders will require injector linacs to accelerate large electron bunches over a wide range of energies. For example the Electron Ion Collider requires a pre-injector linac from 4,MeV up to 400,MeV over 35 [1]. Currently this linac is being designed with 3,m long traveling wave structures, which provide a gradient of 16,MV/m. We propose the use of a 1,m distributed coupling design as a potential alternative and future upgrade path to this design. Distributed coupling allows power to be fed into each cavity directly via a waveguide manifold, avoiding on-axis coupling [2]. A distributed coupling structure at S-band was designed to optimize for shunt impedance and large aperture size. This design provides greater efficiency, thereby lowering the number of klystrons required to power the full linac. In addition, particle tracking analysis shows that this linac maintains lower emittance as bunch charge increases to 14,nC and wakefields become more prevalent. We present the design of this distributed coupling structure, as well as cold test data and plans for higher power tests to verify on the structure's real world performance. |
Tuesday, April 18, 2023 1:54PM - 2:06PM |
U16.00003: Terahertz Timing Diagnostics and Jitter Correction in Ultrafast Electron Diffraction Accelerator Beamlines Mohamed Othman Mega electron volt (MeV) accelerators used for ultrafast electron diffraction (UED) have provided a unique insight into visualizing elusive ultrafast processes from photochemical reactions and lattice motion, to phase transitions occurring in quantum materials. In this work, we demonstrate recent measurements of strong THz streaking of ultrafast electron bunches generated from an rf photoeinjector using an efficient THz deflector structure. We show that the structure can achieve upward of 1.5 MV/cm of peak THz fields to 3 MeV, 10 fC bunches subsequently improving the timing resolution of single-shot measurements of bunch length and jitter. Such measurements are used to obtain a significant improvement in the MeV-UED timing resolution. With this setup, we have measured coherent charge wave oscillations in photo-excited TaS2 thin film within ~50 fs temporal resolution. These results are essential for the development of a THz timing tool toward new regimes of few femtosecond timing resolution. |
Tuesday, April 18, 2023 2:06PM - 2:18PM |
U16.00004: 1D Analysis of harmonically seeded Free-Electron Lasers Ganesh Tiwari The conventional treatment for deriving Free-Electron Laser (FEL) pendulum equations and gain formula assume that the pondermotive potential is provided by the fundamental radiation. While such treatment is valid for FELs during startup from noise, it is feasible to seed the FEL with a harmonic radiation (h>1) via cavity configurations or outcoupling schemes. When the field amplitude of this harmonic part is higher than that of the fundamental wavelength from spontaneous emission, the FEL dynamics is dictated by the presence of the harmonic content. Here we revisit the 1D FEL equations of motion and gain formula to investigate effects on electron beam dynamics and radiation power output when the FEL is seeded by a harmonic. |
Tuesday, April 18, 2023 2:18PM - 2:30PM |
U16.00005: Abstract Withdrawn |
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