Author: Latina, A.
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MOPOJO09 A Compact Inverse Compton Scattering Source Based on X-Band Technology and Cavity-Enhanced High Average Power Ultrafast Lasers 44
  • A. Latina, R. Corsini, L.A. Dyks, E. Granados, A. Grudiev, V. Musat, S. Stapnes, W. Wuensch
    CERN, Meyrin, Switzerland
  • E. Cormier
    CELIA, Talence, France
  • L.A. Dyks
    Oxford University, Physics Department, Oxford, Oxon, United Kingdom
  • G. Santarelli
    ILE, Palaiseau Cedex, France
  A high-pulse-current injector followed by a short high-gradient X-band linac is considered as a driver for a compact Inverse Compton Scattering source. We show that using a high-power ultrashort pulse laser operating in burst mode and a Fabry-Pérot enhancement cavity, X-rays with flux values over 1013 ph/s and photon energies up to MeV are achievable. The resulting high-intensity and high-energy X-rays allow for various applications, including cancer therapy, tomography, and nuclear waste management. A preliminary conceptual design of such a compact ICS source is presented, together with simulations of the expected performance.  
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About • Received ※ 19 August 2022 — Revised ※ 30 August 2022 — Accepted ※ 01 September 2022 — Issue date ※ 06 September 2022
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TUPORI13 Beam Loading Simulation for Relativistic and Ultrarelativistic Beams in the Tracking Code RF-Track 569
  • J. Olivares Herrador, A. Latina
    CERN, Meyrin, Switzerland
  • D. Esperante Pereira, N. Fuster, B. Gimeno
    IFIC, Valencia, Spain
  • B. Gimeno
    UVEG, Burjasot (Valencia), Spain
  Medical and industrial electron linacs can benefit from the X-band accelerating technology developed for the Compact Linear Collider (CLIC) at CERN. However, when high-intensity beams are injected in such high-gradient structures (>35 MV/m), the beam loading effect must be considered by design since this beam-cavity interaction can result in a considerable gradient reduction with respect to the unloaded case. Studying energy conservation, a partial differential equation (PDE) has been derived for injected beams, in both the relativistic and ultrarelativistic limit. Making use of this, a specific simulation package within RF-track has been developed, allowing realistic tracking of charged particle bunches under this effect regardless of their initial velocity. The performance of such tool has been assessed by reproducing previously obtained beam loaded fields in CLIC main linac and CLIC Drive-Beam linac structures. In this paper we present the analytic PDE derivation and the results of the tests.  
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About • Received ※ 18 August 2022 — Revised ※ 26 August 2022 — Accepted ※ 02 September 2022 — Issue date ※ 07 September 2022
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TUPORI14 A Start-to-End Optimisation Strategy for the CompactLight Accelerator Beamline 573
  • Y. Zhao, A. Latina
    CERN, Meyrin, Switzerland
  • A. Aksoy
    Ankara University, Accelerator Technologies Institute, Golbasi, Turkey
  • H.M. Castañeda Cortés, D.J. Dunning, N. Thompson
    STFC/DL/ASTeC, Daresbury, Warrington, Cheshire, United Kingdom
  The CompactLight collaboration designed a compact and cost-effective hard X-ray FEL facility, complemented by a soft X-ray option, based on X-band acceleration, capable of operating at 1 kHz pulse repetition rate. In this paper, we present a new simple start-to-end optimisation strategy that is developed for the CompactLight accelerator beamline, focusing on the hard X-ray mode. The optimisation is divided into two steps. The first step improves the electron beam quality that finally leads to a better FEL performance by optimising the major parameters of the beamline. The second step provides matched twiss parameters for the FEL undulator by tuning the matching quadrupoles at the end of the accelerator beamline. A single objective optimisation method, with different objective functions, is used to optimise the performance. The sensitivity of the results to jitters is also minimised by including their effects in the final objective function.  
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About • Received ※ 15 August 2022 — Revised ※ 31 August 2022 — Accepted ※ 31 August 2022 — Issue date ※ 15 September 2022
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WE2AA01 The CompactLight Design Study 642
  • A. Latina
    CERN, Meyrin, Switzerland
  • G. D’Auria, R.A. Rochow
    Elettra-Sincrotrone Trieste S.C.p.A., Basovizza, Italy
  CompactLight (XLS) is an H2020 Design Study funded by the European Union under grant agreement No. 777431 and carried out by an international collaboration of 23 international laboratories and academic institutions, three private companies, and five third parties. The project, which started in January 2018 with a duration of 48 months, aimed to design an innovative, compact, and cost-effective hard X-ray FEL facility complemented by a soft X-ray source. In December 2021, the Conceptual Design Report was completed. The result is an accelerator that can be operated at up to 1 kHz pulse repetition rate, beyond today’s state of the art, using the latest concepts for high brightness electron photoinjectors, very high gradient accelerating structures in X-band, and novel short-period undulators. This paper gives an overview of the current status, focusing particularly on the technological challenges addressed and their future applications to compact accelerator-based facilities.  
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About • Received ※ 19 August 2022 — Revised ※ 25 August 2022 — Accepted ※ 30 August 2022 — Issue date ※ 02 September 2022
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THPOJO08 RF Design of Traveling-Wave Accelerating Structures for the FCC-ee Pre-injector Complex 707
  • H.W. Pommerenke, A. Grudiev, A. Latina
    CERN, Meyrin, Switzerland
  • S. Bettoni, P. Craievich, J.-Y. Raguin, M. Schaer
    PSI, Villigen PSI, Switzerland
  Funding: This project received funding from the EU’s Horizon 2020 research program (grant No 951754), and was done under the auspices of CHART (Swiss Accelerator Research and Technology Collaboration).
The linacs of the FCCee (Future Circular Electron-Positron Collider) injector complex will both provide the drive beam for positron production and accelerate nominal electron and positron beams up to 6 GeV. Several linacs comprise different traveling-wave (TW) accelerating structures fulfilling the beam dynamics and rf constraints. Notably, high-phase advance large-aperture structures accelerate the positron beam at low energies. All TW structures are rotationally symmetric for easier production. Long-range wakes are damped by HOM detuning. Operating mode and HOM parameters were calculated based on lookup tables and analytic formulas, allowing for rapidly scanning large parameter spaces. In this paper, we present both methodology and realization of the rf design of the TW structures including their pulse compressors.
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About • Received ※ 24 August 2022 — Accepted ※ 08 September 2022 — Issue date ※ 15 September 2022  
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