Keyword: electron
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MO2L2 Storage Ring Based Steady State Microbunching radiation, laser, storage-ring, bunching 1
 
  • A. Chao
    TUB, Beijing, People’s Republic of China
  
  Powerful light sources are highly desired tools for scientific research and for industrial applications. Electrons are the objects that most readily and easily radiate photons. A natural conclusion follows that one should pursue electron accelerators as the choice tools towards powerful light sources. How to manipulate the electron beam in the accelerator so that it radiates light most efficiently, however, remains to be studied and its physical principle and technical limits be explored and optimized for the purpose. One such proposed concepts is based on the steady state microbunching (SSMB) mechanism in an electron storage ring. We make a brief introduction of the SSMB mechanism and its recent status in this presentation.  
slides icon Slides MO2L2 [1.156 MB]  
DOI • reference for this paper ※ doi:10.18429/JACoW-FLS2023-MO2L2  
About • Received ※ 25 August 2023 — Revised ※ 28 August 2023 — Accepted ※ 31 August 2023 — Issued ※ 02 December 2023
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MO2L3 Review of Harmonic Cavities in Fourth-generation Storage Rings cavity, storage-ring, synchrotron, survey 8
 
  • F.J. Cullinan, Å. Andersson, P. Tavares
    MAX IV Laboratory, Lund University, Lund, Sweden
  
  Several third generation light-source storage rings have used harmonic cavities to lengthen the electron bunches. With the advent of the fourth generation however, they have become an almost universal feature as the small transverse electron beam sizes make long bunches essential for increasing Touschek lifetime and reducing emittance blow-up from intrabeam scattering. Multiple technological solutions exist for the implementation of harmonic cavities and which to use remains an open question for many facilities. This is therefore a very active area of study in which there is strong collaboration within the community. Avoiding coherent collective beam instabilities is of particular concern. In this talk, I will summarise the results obtained so far. I will also give an overview of the observations made at the MAX IV 3 GeV ring, the first fourth generation storage ring which was commissioned with normal-conducting passive harmonic cavities already installed. Finally, I will discuss potential future directions.  
slides icon Slides MO2L3 [3.035 MB]  
DOI • reference for this paper ※ doi:10.18429/JACoW-FLS2023-MO2L3  
About • Received ※ 24 August 2023 — Revised ※ 25 August 2023 — Accepted ※ 27 August 2023 — Issued ※ 02 December 2023
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MO3B4 Generating High Repetition Rate X-ray Attosecond Pulses in SAPS radiation, storage-ring, laser, dipole 22
 
  • W. Liu, X. Liu, Y. Zhao
    IHEP CSNS, Guangdong Province, People’s Republic of China
  • Y. Jiao, X. Li, S. Wang
    IHEP, Beijing, People’s Republic of China
  
  Attosecond, which refers to 10-18 seconds, is the timescale of electron motion within an atom. Accurate observation of electron motion helps deepen the understanding of microscopic quantum processes such as charge transfer in molecules, wave packet dynamics, and charge transfer in organic photovoltaic materials. To meet the needs of relevant research, the South Advanced Photon Source (SAPS), currently in the design phase, is considering the construction of an attosecond beamline. This paper presents relevant research on achieving high-repetition-rate coherent attosecond pulses on the fourth-generation storage ring at SAPS. Realizing attosecond pulses in a storage ring requires femtosecond to sub-femtosecond-level longitudinal modulation of the beam, and the modulation scheme needs to consider multiple factors to avoid a significant impact on other users. The study shows that with high-power, few-cycle lasers, and advanced beam modulation techniques, the photon flux of attosecond pulses can be significantly enhanced with a minimal impact on the brightness of synchrotron radiation. Adopting high-repetition-rate lasers and precise time delay control, the repetition rate of attosecond pulses at SAPS can reach the megahertz level. Currently, the design wavelength range for attosecond pulses covers the water window (2.3-4.4 nm), which is "transparent" to water but strongly absorbed by elements constituting living organisms. This wavelength range has significant application value in fields such as biology and chemistry.  
slides icon Slides MO3B4 [3.400 MB]  
DOI • reference for this paper ※ doi:10.18429/JACoW-FLS2023-MO3B4  
About • Received ※ 23 August 2023 — Revised ※ 24 August 2023 — Accepted ※ 31 August 2023 — Issued ※ 02 December 2023
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MO3A2 Status and Perspectives for the Swiss Free-Electron Laser (SwissFEL) FEL, undulator, laser, operation 26
 
  • T. Schietinger
    PSI, Villigen PSI, Switzerland
  
  We summarize the status of SwissFEL, the X-ray free-electron laser at the Paul Scherrer Institute. Apart from some key operational performance figures the presentation covers the state of the experimental stations and their capabilities, gives a few scientific highlights and an overview of the use of special modes beyond SASE at our facility. Furthermore we report on progress of our seeding upgrade program on the soft X-ray line. Lastly we mention our long-term upgrade plans for a third undulator beamline in the tender and hard X-ray regime.  
slides icon Slides MO3A2 [8.398 MB]  
DOI • reference for this paper ※ doi:10.18429/JACoW-FLS2023-MO3A2  
About • Received ※ 29 August 2023 — Revised ※ 30 August 2023 — Accepted ※ 30 August 2023 — Issued ※ 02 December 2023
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MO3A5 FLASH: Status and Upgrade laser, FEL, undulator, operation 32
 
  • M. Vogt, S. Schreiber, J. Zemella
    DESY, Hamburg, Germany
  
  FLASH, the Soft X-Ray and Extreme-UV Free Electron Laser at DESY, is undergoing a substantial upgrade and refurbishment project, called FLASH2020+. The project will finally enable external seeded and SASE FEL operation for a wavelength range down to 4 nm with the EEHG method. This is achieved in two long shutdowns from November 2021 to August 2022 and from June 2024 to August 2025. Key ingredient of the upgrade were installation of a laser heater, replacing two early TTF-type L-band SRF accelerating modules by modern, high-gradient XFEL-type modules, redesign of the 2nd bunch compressor, and complete redesign of the FLASH1 beam line for HGHG/EEHG seeding. This talk will report on the project and the status of FLASH after the first shutdown with emphasis on beam dynamics aspects.  
slides icon Slides MO3A5 [1.108 MB]  
DOI • reference for this paper ※ doi:10.18429/JACoW-FLS2023-MO3A5  
About • Received ※ 25 August 2023 — Revised ※ 26 August 2023 — Accepted ※ 31 August 2023 — Issued ※ 02 December 2023
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MO4C2 Development of a Compact Light Source using a Two-beam-acceleration Technique emittance, cathode, brightness, linac 42
 
  • P. Piot, E.A. Frame, X. Lu
    Northern Illinois University, DeKalb, Illinois, USA
  • G. Chen, C.-J. Jing, X. Lu, J.G. Power
    ANL, Lemont, Illinois, USA
  • C.-J. Jing, S.V. Kuzikov
    Euclid Beamlabs, Bolingbrook, USA
  
  Funding: This work is supported by the U.S. DOE, under award No. DE-AC02-06CH11357 with ANL. This work is partially supported by Laboratory Directed Research and Development (LDRD) funding at ANL.
The recent demonstration of sub-GV/m accelerating fields at X-band frequencies* offers an alternative pathway to designing a compact light source. The high fields were enabled by powering the accelerating structures using short (<10 ns) X-band RF pulses produced via a two-beam-accelerator (TBA) scheme. In this contribution, we present a conceptual design to scale the concept to a ~0.5 GeV accelerator. We present the optimization of the photoinjector and preliminary beam-dynamics modeling of the accelerator. Finally, we will discuss ongoing and planned experiments toward developing an integrated proof-of-principle experiment at Argonne National Laboratory combining the 0.5 GeV linac with a free-electron laser.
* W.H. Tan, et al. DOI: 10.1103/PhysRevAccelBeams.25.083402 (2022). 		 
slides icon Slides MO4C2 [2.690 MB]  
DOI • reference for this paper ※ doi:10.18429/JACoW-FLS2023-MO4C2  
About • Received ※ 31 August 2023 — Revised ※ 31 August 2023 — Accepted ※ 01 September 2023 — Issued ※ 02 December 2023
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TU1C1 An Efficient Optimisation of a Burst Mode-Operated Fabry-Perot Cavity for Compton Light Sources laser, cavity, photon, optics 46
 
  • V. Mușat, E. Granados, A. Latina
    CERN, Meyrin, Switzerland
  • E. Cormier
    CELIA, Talence, France
  • G. Santarelli
    ILE, Palaiseau Cedex, France
  
  The burst mode operation of a Fabry-Perot cavity (FPC) allows for the generation of a high-intensity photon beam in inverse Compton scattering (ICS) sources. The geometry and burst mode parameters of the FPC can be optimised to maximise the scattered photon flux. A novel optimisation method is presented, significantly improving processing speed and accuracy. The FPC’s dimensions, mirror requirements, and effective energy can be obtained from the electron beam parameters at the interaction point. A multi-objective optimization algorithm was used to derive the geometrical parameters of the FPC; this brought orders of magnitude increase in computation speed if compared to the nominal Monte Carlo-based approaches. The burst mode parameters of the FPC were obtained by maximizing the effective energy of the laser pulse in the FPC. The impact of optical losses and thermal lensing on the FPC parameters is addressed. Preliminary parameters of an ICS source implementing this novel optimisation are presented. The source could reach high-performance photon beams for high-energy applications.  
slides icon Slides TU1C1 [1.776 MB]  
DOI • reference for this paper ※ doi:10.18429/JACoW-FLS2023-TU1C1  
About • Received ※ 22 August 2023 — Revised ※ 24 August 2023 — Accepted ※ 30 August 2023 — Issued ※ 02 December 2023
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TU1C2 Evolution of the Inverse Compton Scattering X-ray Source of the ELSA Accelerator laser, alignment, scattering, cavity 50
 
  • A. Pires, R. Rosch, J. Touguet
    CEA, Arpajon, France
  • N. Delerue
    Université Paris-Saclay, CNRS/IN2P3, IJCLab, Orsay, France
  • V. Le Flanchec
    CEA/DAM/DIF, Arpajon, France
  
  The Inverse Compton Scattering (ICS) X-ray source of ELSA accelerator at CEA-DAM, presents an efficient approach for generating X-rays with a compact linac. The source consists of a 30 MeV, 15 ps rms, up to 3 nC electron beam; and a table-top Nd:YAG laser. X-rays are produced in the 10-80 keV range, higher X-ray energies achieved with frequency doubling of the laser. The yield is increased by a factor of 8 thanks to an optical mirror system developed at CEA, folding the laser beam path and accumulating successive laser pulses. We present a new version of the device, with improvement of mechanical constraints management, adjunction of motorized mirrors, and a new imaging system. A Chirped Pulse Amplification (CPA) system was also designed, enabling higher amplification levels without exceeding laser damage threshold. The uniqueness of this CPA system lies in its use of a short wavelength bandwidth, ±250 pm after Self-Phase Modulation (SPM) broadening, and a line density of 1850 lines/mm for the gratings of the compressor. The pulse is stretched with a chirped fiber Bragg grating (CFBG) before amplification in Nd:YAG amplifiers, and compressed by a double pass grating compressor.  
slides icon Slides TU1C2 [7.085 MB]  
DOI • reference for this paper ※ doi:10.18429/JACoW-FLS2023-TU1C2  
About • Received ※ 25 August 2023 — Revised ※ 25 August 2023 — Accepted ※ 30 August 2023 — Issued ※ 02 December 2023
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TU1C4 The CXFEL Project at Arizona State University laser, FEL, photon, timing 54
 
  • W.S. Graves
    ASU, Tempe, USA
  
  Funding: This work supported by National Science Foundation awards 2153503, 1935994, and 1632780.
The CXFEL Project encompasses the Compact X-ray Light Source (CXLS) that is now commissioning in the hard x-ray energy range 4-20 keV, and the Compact X-ray Free-Electron Laser (CXFEL) designed to lase in the soft x-ray range 300 ¿ 2500 eV. CXFEL has recently completed a 3-year design phase and just received NSF funding for construction over the next 5 years. These instruments are housed in separate purpose-built laboratories and rely on inverse Compton scattering of bright electron beams on powerful lasers to produce femtosecond pulses of x-rays from very compact linacs approximately 1 m in length. Both instruments use recently developed X-band distributed-coupling, room-temperature, standing-wave linacs and photoinjectors operating at 1 kHz repetition rates and 9300 MHz RF frequency. They rely on recently developed Yb-based lasers operating at high peak and average power to produce fs pulses of 1030 nm light at 1 kHz repetition rate with pulse energy up to 400 mJ. We present the current commissioning performance and status of CXLS. We also review the design and initial construction activities of the large collaborative effort to develop the fully coherent CXFEL. 		 
slides icon Slides TU1C4 [7.974 MB]  
DOI • reference for this paper ※ doi:10.18429/JACoW-FLS2023-TU1C4  
About • Received ※ 30 August 2023 — Revised ※ 31 August 2023 — Accepted ※ 01 September 2023 — Issued ※ 02 December 2023
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TU2A2 Single Longitudinal Mode Generation in Slippage-dominated, Tapered-undulator SASE Soft X-ray FEL undulator, FEL, simulation, photon 70
 
  • D.C. Nguyen, M. Dunham, W. Lou, C.E. Mayes, G. Stupakov
    xLight, Palo Alto, USA
  
  SASE FELs operating in the soft X-ray region exhibit multiple temporal and spectral spikes with an overall spectral bandwidth of about 1.5 times the FEL rho parameter. While many ideas have been proposed to achieve fully coherent X-ray FELs, only monochromatic seeding, either harmonic seeding* or SASE self-seeding**, has been experimentally demonstrated to narrow the output spectra of soft X-ray FELs. In this paper, we study a different method that relies on the Slippage-dominated Tapered Undulator (STU) SASE concept to produce a single longitudinal mode in a soft X-ray FEL driven by ~10-fs, 16-pC electron bunches. We pre-sent numerical simulation results that demonstrate single-mode generation and narrow-lined spectra without seeding in a STU-SASE FEL at 6.67 nm.
* E. Alaria et al., Nat Photon 7 (2013) 913-918
** D. Ratner et al., PRL 114 (2015) 050801
 		 
slides icon Slides TU2A2 [1.125 MB]  
DOI • reference for this paper ※ doi:10.18429/JACoW-FLS2023-TU2A2  
About • Received ※ 22 August 2023 — Revised ※ 23 August 2023 — Accepted ※ 31 August 2023 — Issued ※ 02 December 2023
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TU4P05 Design of the Test Platform for High Current VHF Electron Gun vacuum, gun, cathode, emittance 80
 
  • Z.P. Liu, X.D. Li
    SINAP, Shanghai, People’s Republic of China
  • H.X. Deng, Z.G. Jiang
    SARI-CAS, Pudong, Shanghai, People’s Republic of China
  • H.J. Qian
    DESY Zeuthen, Zeuthen, Germany
  • G. Shu
    IHEP, Beijing, People’s Republic of China
  
  A high-average-current VHF electron gun operating in the CW mode is under construction at Shanghai Advanced Research Institute, which is the key component of a kW-power-order free electron laser facility. The average current and the frequency of this electron gun is 1-10 mA and 217 MHz, respectively. To validate the performance of this instrument, a test platform has been designed. The R&D of its vacuum and diagnostics are presented in this work.  
DOI • reference for this paper ※ doi:10.18429/JACoW-FLS2023-TU4P05  
About • Received ※ 23 August 2023 — Revised ※ 28 August 2023 — Accepted ※ 31 August 2023 — Issued ※ 02 December 2023
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TU4P06 The Experimental Progress for the Strong Field Terahertz Radiation at Shanghai Soft X-ray Free-electron Laser Facility radiation, laser, undulator, FEL 83
 
  • K.Q. Zhang, C. Feng
    SSRF, Shanghai, People’s Republic of China
  • Y. Kang
    SINAP, Shanghai, People’s Republic of China
  
  Strong field Terahertz (THz) light source has been in-creasingly important for many scientific frontiers, while it is still a challenge to obtain THz radiation with high pulse energy at wide-tunable frequency. In this paper, we introduce an accelerator-based strong filed THz light source to obtain coherent THz radiation with high pulse energy and tunable frequency and X-ray pulse at the same time, which adopts a frequency beating laser pulse modulated electron beam. Here, we present the experi-mental progress for the strong filed THz radiation at shanghai soft X-ray free-electron laser (SXFEL) facility and show its simulated radiation performance.  
poster icon Poster TU4P06 [1.310 MB]  
DOI • reference for this paper ※ doi:10.18429/JACoW-FLS2023-TU4P06  
About • Received ※ 21 August 2023 — Revised ※ 28 August 2023 — Accepted ※ 31 August 2023 — Issued ※ 02 December 2023
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TU4P07 Design of the Beam Distribution System of SHINE undulator, kicker, linac, FEL 87
 
  • S. Chen
    SSRF, Shanghai, People’s Republic of China
  • H.X. Deng, X. Fu, B. Liu
    SARI-CAS, Pudong, Shanghai, People’s Republic of China
  • B.Y. Yan
    SINAP, Shanghai, People’s Republic of China
  
  The Shanghai high-repetition-rate XFEL and extreme light facility (SHINE), as the first hard X-ray free electron laser facility in China, is now under construction. CW electron beam with up to 1 MHz bunch repetition rate from a superconducting RF linac is used to feed at least three individual undulator lines that covers a wide photon energy range (0.4 keV ~ 25 keV). In order to maximize the efficiency of the facility, a beam switchyard between the linac and undulator lines is used to enable the simultaneously operation of the three undulator lines. In this work, the schematic design of the beam switchyard for bunch-by-bunch beam separation of CW beam is described, and the current lattice design of the linac-to-undulator deflection branches and the start-to-end tracking simulation results are presented.  
DOI • reference for this paper ※ doi:10.18429/JACoW-FLS2023-TU4P07  
About • Received ※ 22 August 2023 — Revised ※ 28 August 2023 — Accepted ※ 31 August 2023 — Issued ※ 02 December 2023
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TU4P11 Symmetric Compton Scattering: A Way Towards Plasma Heating and Tunable Mono-chromatic Gamma-rays photon, scattering, radiation, plasma 95
 
  • L. Serafini, A. Bacci, I. Drebot, M. Rossetti Conti, S. Samsam
    INFN-Milano, Milano, Italy
  • C. Curatolo
    INFN- Sez. di Padova, Padova, Italy
  • V. Petrillo, A. Puppin
    Universita’ degli Studi di Milano & INFN, Milano, Italy
  
  We analyze the transition between Compton Scattering and Inverse Compton Scattering (ICS), characterized by an equal exchange of energy and momentum between the colliding particles (electrons and photons). In this Symmetric Compton Scattering (SCS) regime, the energy-angle correlation of scattered photons is cancelled, and, when the electron recoil is large, monochromaticity is transferred from one colliding beam to the other. Large-recoil SCS or quasi-SCS can be used to design compact intrinsic monochromatic γ-ray sources based on compact linacs, thus avoiding the use of GeV-class electron beams and powerful laser/optical systems as required for ICS sources. At very low recoil and energy collisions (about 10 keV energy range), SCS can be exploited to heat the colliding electron beam, which is scattered with large transverse momenta over the entire solid angle, offering a technique to trap electrons into magnetic bottles for plasma heating.  
DOI • reference for this paper ※ doi:10.18429/JACoW-FLS2023-TU4P11  
About • Received ※ 24 August 2023 — Revised ※ 28 August 2023 — Accepted ※ 31 August 2023 — Issued ※ 02 December 2023
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TU4P12 Injection Into XFELs, a Review of Trends and Challenges FEL, gun, emittance, linac 99
 
  • C. Davut
    UMAN, Manchester, United Kingdom
  • Ö. Apsimon
    Cockcroft Institute, Warrington, Cheshire, United Kingdom
  • B.L. Militsyn, S.S. Percival
    STFC/DL/ASTeC, Daresbury, Warrington, Cheshire, United Kingdom
  
  Funding: Science and Technology Facilities Council, STFC
In this contribution, we review the low-energy electron injectors for existing X-ray Free-Electron Laser (XFEL) facilities focusing on the buncher and booster sections. The technology choices are parallel to the increasing demand for stricter six-dimensional phase space quality. The current capability for beam parameters and future requirements are laid out alongside a discussion on challenges and technological bottlenecks. In light of this review, preliminary results for a high capability injector providing high repetition rate, and continuous wave emission is presented as an option for the UK XFEL. 		 
DOI • reference for this paper ※ doi:10.18429/JACoW-FLS2023-TU4P12  
About • Received ※ 23 August 2023 — Revised ※ 24 August 2023 — Accepted ※ 30 August 2023 — Issued ※ 02 December 2023
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TU4P13 An Introduction to the UK XFEL Conceptual Design and Options Analysis FEL, photon, laser, free-electron-laser 103
 
  • D.J. Dunning, D. Angal-Kalinin, J.A. Clarke, J. Henderson, S.L. Mathisen, B.L. Militsyn, M.D. Roper, E.W. Snedden, N. Thompson, D.A. Walsh, P.H. Williams
    STFC/DL/ASTeC, Daresbury, Warrington, Cheshire, United Kingdom
  • P. Aden, B.D. Fell
    STFC/DL, Daresbury, Warrington, Cheshire, United Kingdom
  • D. Angal-Kalinin, J.A. Clarke, D.J. Dunning, J. Henderson, B.L. Militsyn, N. Thompson, P.H. Williams
    Cockcroft Institute, Warrington, Cheshire, United Kingdom
  • J.L. Collier, J.S. Green
    STFC/RAL, Chilton, Didcot, Oxon, United Kingdom
  • J.P. Marangos
    Imperial College of Science and Technology, Department of Physics, London, United Kingdom
  
  In October 2022, the UK XFEL project entered a new phase to explore how best to deliver the advanced XFEL capabilities identified in the project’s Science Case. This phase includes developing a conceptual design for a unique new machine to fulfil the required capabilities and more. It also examines the possibility of investment opportunities at existing XFELs to deliver the same aims, and a comparison of the various options will be made. The desired next-generation capabilities include transform-limited operation across the entire X-ray range with pulse durations ranging from 100 as to 100 fs; evenly spaced high rep. rate pulses for enhanced data acquisition rates; optimised multi-colour FEL pulse delivery and a full array of synchronised sources (XUV-THz sources, electron beams and high power/high energy lasers). The project also incorporates sustainability as a key criteria. This contribution gives an overview of progress to date and future plans.  
DOI • reference for this paper ※ doi:10.18429/JACoW-FLS2023-TU4P13  
About • Received ※ 23 August 2023 — Revised ※ 25 August 2023 — Accepted ※ 30 August 2023 — Issued ※ 02 December 2023
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TU4P16 Transverse Optics-based Control of the Microbunching Instability FEL, bunching, optics, laser 107
 
  • A.D. Brynes, E. Allaria, G. De Ninno, S. Di Mitri, D. Garzella, C. Spezzani
    Elettra-Sincrotrone Trieste S.C.p.A., Basovizza, Italy
  • G. De Ninno
    University of Nova Gorica, Nova Gorica, Slovenia
  • G. Perosa
    Università degli Studi di Trieste, Trieste, Italy
  • C.-Y. Tsai
    HUST, Wuhan, People’s Republic of China
  
  A number of recent experimental and theoretical studies have investigated novel techniques for suppressing the microbunching instability in high-brightness linac-based light sources. This instability has long been studied as one of the causes of reduced longitudinal coherence in these machines, which are commonly suppressed using a laser heater. This contribution presents recent developments concerning the use of an optics-based scheme to mitigate the microbunching instability in the FERMI free-electron laser, paving the way towards reversible beam heating techniques that could improve the performance of future machines.  
DOI • reference for this paper ※ doi:10.18429/JACoW-FLS2023-TU4P16  
About • Received ※ 23 August 2023 — Revised ※ 29 August 2023 — Accepted ※ 31 August 2023 — Issued ※ 02 December 2023
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TU4P17 Non-destructive Vertical Halo-monitors on the ESRF Electron Beam vacuum, emittance, SRF, diagnostics 112
 
  • K.B. Scheidt
    ESRF, Grenoble, France
  
  The ESRF EBS storage ring has since spring 2022 among its electron beam diagnostics two independent units of vertical Halo-monitors. The principle and the components of this unique diagnostic will be explained in details. It uses the available X-rays in a non-used Front-End, emitted from a 0.57 T standard dipole magnet in the EBS lattice. This instrument measures the so-called "far-away" Halo level, i.e. in a zone of roughly 1-3 mm away from the beam centre, which represents 200-600 times the electron’s vertical beam-size, supposedly Gaussian, of 5 um. It is measured, and expressed quantitively in picoAmp beam current, at 1 Hz rate. Both units are yielding very satisfying and well-correlated results that will be presented in details, and in relation with studies on the electron beam and the accelerator components like variation of current, filling-patterns, vertical emittance, quality of the vacuum, settings of the undulator gaps, collimators, scrapers etc. and also in direct correlation with measurements of our 128 beamloss detectors and beam lifetime.  
DOI • reference for this paper ※ doi:10.18429/JACoW-FLS2023-TU4P17  
About • Received ※ 21 August 2023 — Revised ※ 28 August 2023 — Accepted ※ 30 August 2023 — Issued ※ 02 December 2023
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TU4P29 Why is the Coherent Radiation from Laser-induced Microbunches Narrowbanded and Collimated radiation, laser, bunching, undulator 139
 
  • X.J. Deng, A. Chao
    TUB, Beijing, People’s Republic of China
  
  There are two reasons: one is the long coherence length of radiation from micobunches imprinted by the modulation laser, the second is the finite transverse electron beam size. In other words, one is due to the longitudinal form factor, and the other the transverse form factor of the electron beam. Here we study the role of these form factors in shaping the energy spectrum and spatial distribution of microbunching radiation. The investigations are of value for cases like steady-state microbunching (SSMB), coherent harmonic generation (CHG) and free-electron laser (FEL).  
DOI • reference for this paper ※ doi:10.18429/JACoW-FLS2023-TU4P29  
About • Received ※ 14 August 2023 — Revised ※ 24 August 2023 — Accepted ※ 30 August 2023 — Issued ※ 02 December 2023
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TU4P34 Recent Developments of the cSTART Project storage-ring, injection, lattice, cavity 155
 
  • M. Schwarz, A. Bernhard, E. Bründermann, D. El Khechen, B. Härer, A. Malygin, A.-S. Müller, M.J. Nasse, G. Niehues, A.I. Papash, R. Ruprecht, J. Schäfer, M. Schuh, N.J. Smale, P. Wesolowski, C. Widmann
    KIT, Karlsruhe, Germany
  
  The combination of a compact storage ring and a laser-plasma accelerator (LPA) can serve as the basis for future compact light sources. One challenge is the large momentum spread (~ 2%) of the electron beams delivered by the LPA. To overcome this challenge, a very large acceptance compact storage ring (VLA-cSR) was designed as part of the compact STorage ring for Accelerator Research and Technology (cSTART) project. The project will be realized at the Karlsruhe Institute of Technology (KIT, Germany). Initially, the Ferninfrarot Linac- Und Test-Experiment (FLUTE), a source of ultra-short bunches, will serve as an injector for the VLA-cSR to benchmark and emulate LPA-like beams. In a second stage, a laser-plasma accelerator will be used as an injector, which is being developed as part of the ATHENA project in collaboration with DESY and the Helmholtz Institute Jena (HIJ). The small facility footprint, the large-momentum spread bunches with charges from 1 pC to 1 nC and lengths from few fs to few ps pose challenges for the lattice design, RF system and beam diagnostics. This contribution summarizes the latest results on these challenges.  
DOI • reference for this paper ※ doi:10.18429/JACoW-FLS2023-TU4P34  
About • Received ※ 21 August 2023 — Revised ※ 22 August 2023 — Accepted ※ 31 August 2023 — Issued ※ 02 December 2023
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WE3A3 Multi-FELOs Driven by a Common Electron Beam FEL, undulator, radiation, laser 164
 
  • C.-Y. Tsai
    HUST, Wuhan, People’s Republic of China
  • Y. Zhang
    JLab, Newport News, Virginia, USA
  
  Generating an FEL requires a high-brightness electron beam. To produce multiple FELs, the linac beam must be shared to enable one beam driving an undulator. This leads to a reduced average current and compromised FEL performance. Recently, a concept of multiple FELs driven by one electron beam was proposed, which enables reduction of equipment and improvement of productivity. We present here a simulation study based on an extended 1D FEL oscillator model to demonstrate this concept. The system consists of two FEL oscillators arranged side-by-side and one electron beam passing through them. As such, the second, downstream oscillator is driven by bunches already been used once, while the first oscillator always receives fresh bunches from the linac. The study shows lasing could be achieved for both oscillators, their radiation intensities at saturation are comparable, thus meet needs of users. The concept also enables a potential application using a circulator ring such that an oscillator can be driven alternately by fresh linac bunches from and used bunches in the circulator ring. Extending the concept to cases of more than two FEL oscillators driven by one beam is also explored.  
slides icon Slides WE3A3 [0.540 MB]  
DOI • reference for this paper ※ doi:10.18429/JACoW-FLS2023-WE3A3  
About • Received ※ 23 August 2023 — Revised ※ 23 August 2023 — Accepted ※ 31 August 2023 — Issued ※ 02 December 2023
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WE4P09 Heat Load and Radiation Pulse of Corrugated Structure at SHINE Facility radiation, simulation, wakefield, linac 168
 
  • J.J. Guo
    Zhangjiang Lab, Shanghai, People’s Republic of China
  • H.X. Deng, D. Gu, Q. Gu, M. Meng, Z. Wang
    SARI-CAS, Pudong, Shanghai, People’s Republic of China
  
  Corrugated structure modules are being proposed for installation after the end of the linac and before the undulator regions of SHINE facility, where it has been used for energy chirp control and as a fast kicker for two color operation of the FEL. When ultra-relativistic bunch of electrons passing through corrugated structure will generate strong wakefield, we find most of the wake power lost by the beam is radiated out to the sides of the corrugated structure in the form of THz waves, and the remaining part casue Joule heating load on the corrugated structure wall. In this paper, we estimate the radiation pulse power and Joule power loss of the corrugated structure in SHINE facility.  
poster icon Poster WE4P09 [0.787 MB]  
DOI • reference for this paper ※ doi:10.18429/JACoW-FLS2023-WE4P09  
About • Received ※ 23 August 2023 — Revised ※ 28 August 2023 — Accepted ※ 31 August 2023 — Issued ※ 02 December 2023
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WE4P12 Upgrades of High Level Applications at Shanghai Soft X-Ray FEL Facility FEL, feedback, MMI, laser 171
 
  • H. Luo, D. Gu, T. Liu, Z. Wang
    SARI-CAS, Pudong, Shanghai, People’s Republic of China
  • K.Q. Zhang
    SSRF, Shanghai, People’s Republic of China
  
  The Shanghai soft X-ray free-electron laser(SXFEL) facility has made significant progress in recent years with the rapid, upgraded iterations of the high level software, including but not limited to energy matching, orbit feedback and load, beam optimization, etc. These tools are key components in operation and experiment of free electron laser facility. Some key applications are presented in this paper.  
DOI • reference for this paper ※ doi:10.18429/JACoW-FLS2023-WE4P12  
About • Received ※ 21 August 2023 — Revised ※ 29 August 2023 — Accepted ※ 30 August 2023 — Issued ※ 02 December 2023
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WE4P13 Physics Design and Beam Dynamics Optimization of the SHINE Accelerator linac, FEL, emittance, cryomodule 174
 
  • D. Gu, Z. Wang, M. Zhang
    SARI-CAS, Pudong, Shanghai, People’s Republic of China
  
  Shanghai HIgh Repetition Rate X-ray Free Electron Laser and Extreme Light Facility (SHINE) is a hard X-ray FEL facility which is driven by a 1.3 km supercon-ducting Linac, aims to provide high repetition rate pulses up to 1 MHz . In this study, we present the physics design of the SHINE accelerator and considerations of beam dynamics optimizations. Start-to-end simulation results show that, a high brightness electron beam with over 1500 A quasi-flat-top current can be attained which fully meet the requirements of FEL lines. Furthermore, design of the bypass line is also discussed.  
DOI • reference for this paper ※ doi:10.18429/JACoW-FLS2023-WE4P13  
About • Received ※ 23 August 2023 — Revised ※ 30 August 2023 — Accepted ※ 31 August 2023 — Issued ※ 02 December 2023
Cite • reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)  
 
WE4P14 Layout of the Undulator-to-dump line at the SHINE FEL, undulator, radiation, linac 177
 
  • T. Liu, S. Chen, H.X. Deng, B. Liu, Z. Qi
    SARI-CAS, Pudong, Shanghai, People’s Republic of China
  • Z.F. Gao
    SSRF, Shanghai, People’s Republic of China
  • N. Huang
    Zhangjiang Lab, Shanghai, People’s Republic of China
  
  The Shanghai HIgh repetitioN rate XFEL and Extreme light Facility as the first hard X-ray free-electron laser (FEL) facility in China, is currently under construction in the Zhangjiang area, Shanghai. It aims to deliver X-ray covering photon energy range from 0.4 to 25 keV, with electron beam power up to 800 kW. Downstream of the undulator line, the beam transport design of the undulator-to-dump line is critical which is mainly used for realization of FEL diagnostics based on transverse deflecting structure and beam absorption in the dump. In this manuscript we describe the current layout of this system.  
DOI • reference for this paper ※ doi:10.18429/JACoW-FLS2023-WE4P14  
About • Received ※ 20 August 2023 — Revised ※ 22 August 2023 — Accepted ※ 31 August 2023 — Issued ※ 02 December 2023
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WE4P15 Multichromatic Free-electron Laser Generation Through Frequency-beating in a Chirped Electron Beam FEL, laser, bunching, radiation 181
 
  • Z. Qi, C. Feng
    SARI-CAS, Pudong, Shanghai, People’s Republic of China
  
  We propose a simple method to generate mode-locked multichromatic free-electron laser (FEL) through a longitudinal phase space frequency-beating in a chirped electron beam. Utilizing the two stage modulator-chicane setups in Shanghai Soft X-ray FEL facility, together with a chirped electron beam, we are going to imprint a frequency-beating effect into the electron beam. Hence periodic bunching trains can be formed and can be used to generate mode-locked FEL radiation pulses. Theoretical analysis and numerical simulations are given out to demonstrate the performance of the method. The results indicate that mode-locked FEL in temporal and frequency domain can be formed at the 18th harmonic of the seed laser, with the central wavelength being about 14.58nm and the peak power over 2GW.  
DOI • reference for this paper ※ doi:10.18429/JACoW-FLS2023-WE4P15  
About • Received ※ 01 September 2023 — Revised ※ 01 September 2023 — Accepted ※ 01 September 2023 — Issued ※ 02 December 2023
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WE4P20 Alignment Results of Tandem EPUs at the Taiwan Photon Source photon, alignment, synchrotron, feedback 192
 
  • Y.-C. Liu, C.M. Cheng, T.Y. Chung, Y.M. Hsiao, F.H. Tseng
    NSRRC, Hsinchu, Taiwan
  
  Taiwan Photon Source (TPS) has been open to user operation since 2016. We report the alignment results of tandem EPUs in one double mini-beta y long straight section. The goal is to increase the brilliance of the synchrotron lights produced by the tandem EPUs through well-alignment and using a phase shifter to achieve both spatial and temporal coherence. The calculated brilliance gain of the tandem EPUs is compared, and the difference between the measured and numerical results is analyzed.  
poster icon Poster WE4P20 [4.435 MB]  
DOI • reference for this paper ※ doi:10.18429/JACoW-FLS2023-WE4P20  
About • Received ※ 16 August 2023 — Revised ※ 30 August 2023 — Accepted ※ 31 August 2023 — Issued ※ 02 December 2023
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WE4P24 Optics for an Electron Cooler for the EIC Based on an Electron Storage Ring wiggler, emittance, sextupole, scattering 200
 
  • J. Kewisch, A.V. Fedotov, X. Gu, Y.C. Jing, D. Kayran, I. Pinayev, S. Seletskiy
    BNL, Upton, New York, USA
  
  Funding: Supported by the US Department of Energy, Contract DE-SC0012704
An electron cooler based on a storage ring is one of the options to improve the luminosity in the Electron-Ion Collider (EIC). The transverse emittance of the electrons in the cooler is driven by the quantum excitation in dipoles and wigglers, as well as by both beam-beam scattering with the ions and intra-beam scattering of the electrons in the regions with a non-zero dispersion. The resulting demand to minimize a dispersion conflicts with the need of a sufficient dispersion in sextupoles for chromaticity correction. In this report we discuss our studies of several approaches to electron ring lattice, including those typically used in light sources, and present resulting compromise between various requirements. 		 
DOI • reference for this paper ※ doi:10.18429/JACoW-FLS2023-WE4P24  
About • Received ※ 23 August 2023 — Revised ※ 29 August 2023 — Accepted ※ 30 August 2023 — Issued ※ 02 December 2023
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WE4P39 Larmor Radius Effect on IFEL Accelerator With Staggered Undulator undulator, laser, FEL, radiation 221
 
  • R. Khullar, S.M. Khan, G. Mishra
    Devi Ahilya University, Indore, India
  
  In this paper, the theory of inverse free electron (IFEL) accelerator using staggered undulator has been discussed. The important contribution of staggered undulator parameter and the finite larmour radius effect on energy saturation, saturation length and accelerating gradient of the IFEL accelerator are included in the analysis. Considering the synchrotron radiation losses, the IFEL accelerator equations are derived.
Key words- undulator, inverse free electron laser accelerator, accelerator 		 
poster icon Poster WE4P39 [0.786 MB]  
DOI • reference for this paper ※ doi:10.18429/JACoW-FLS2023-WE4P39  
About • Received ※ 23 August 2023 — Revised ※ 30 August 2023 — Accepted ※ 01 September 2023 — Issued ※ 02 December 2023
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TH1D4 Bi-periodic Undulator: Innovative Insertion Device for SOLEIL II undulator, synchrotron, radiation, storage-ring 228
 
  • A. Potet, F. Blache, P. Brunelle, M.-E. Couprie, O. Marcouillé, A. Mary, T. Mutin, A. Nadji, K. Tavakoli, C. de Oliveira
    SOLEIL, Gif-sur-Yvette, France
  
  SOLEIL II project will lead to optimize the production of photons by a modification of the present facility. The storage ring will be redesigned to reduce electron beam emittance, increase photon beam flux and brightness, and improve beamline resolution. The number of magnetic elements will be increased and the space reserved for insertion devices will be decreased by 30%. SOLEIL magnetic group searches for solutions to generate different magnetic periods in a smaller space to maintain the full spectral domain. Bi-Periodic undulator is an innovative and compact device allowing the use of two selectable magnetic periodicities by superimposition of magnets. The magnetic period can be switched from one value to its triple value by mechanical shift of magnetic arrays. A magnetic design has been performed and the construction of a prototype, including magnetic measurements and corrections, is under progress. The prototype will be installed in the storage ring with the goal to verify the feasibility of the model and to characterize the system. The magnetic fields, the radiation produced and the electron beam dynamics will be considered to have a complete knowledge on this undulator.  
slides icon Slides TH1D4 [2.442 MB]  
DOI • reference for this paper ※ doi:10.18429/JACoW-FLS2023-TH1D4  
About • Received ※ 23 August 2023 — Revised ※ 26 August 2023 — Accepted ※ 31 August 2023 — Issued ※ 02 December 2023
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TH2C1 The COXINEL Seeded Free Electron Laser Driven by the Laser Plasma Accelerator at HZDR laser, plasma, FEL, undulator 232
 
  • M.-E. Couprie, T. André, A. Berlioux, P. Berteaud, F. Blache, F. Bouvet, F. Briquez, Y. Dietrich, J.P. Duval, M. El Ajjouri, C. Herbeaux, N. Hubert, C.A. Kitégi, M. Labat, S. Lê, B. Leluan, A. Loulergue, F. Marteau, M.-H. Nguyen, D. Oumbarek Espinos, D. Pereira, J.P. Ricaud, P. Rommeluère, M. Sebdaoui, K. Tavakoli, M. Valléau, M.V. Vandenberghe, J. Vétéran, C. de Oliveira
    SOLEIL, Gif-sur-Yvette, France
  • I.A. Andriyash, J. Gautier, J.-P. Goddet, O.S. Kononenko, G. Lambert, J.P. Rousseau, A. Tafzi, C. Thaury
    LOA, Palaiseau, France
  • S. Bock, Y.Y. Chang, A.D. Debus, C. Eisenmann, R. Gebhardt, A. Ghaith, S. Grams, U. Helbig, A. Irman, M. Kuntzsch, R.G. Pausch, T. Püschel, S. Schöbel, U. Schramm, K. Steiniger, P. Ufer
    HZDR, Dresden, Germany
  • M. LaBerge
    The University of Texas at Austin, Austin, Texas, USA
  • V. Malka
    Weizmann Institute of Science, Physics, Rehovot, Israel
  • E. Roussel
    PhLAM/CERLA, Villeneuve d’Ascq, France
  
  Laser Plasma Accelerators know a tremendous development these recent years. Being able to reach up to ~100 GV/m, they open new perspectives for compact accelerators. Their performance can be qualified by a Free Electron Laser Application. We report here on the COXINEL seeded Free Electron Laser in the UV using the using high-quality electron beam generated by the 150 TW DRACO laser. The COXINEL line developed at Synchrotron SOLEIL (France) is first introduced. First electron beam transport and undulator radiation observation using electrons from the Laser Plasma Accelerator developed at Laboratoire d’Optique Appliquée (France) are described. Then, we present the first COXINEL results driven by the DRACO laser high performance plasma accelerator after its move to Helmholtz-Zentrum Dresden-Rossendorf (HZDR) (Germany): proper electron beam transport, undulator seed and undulator radiation temporal, spectral and spatial overlaps, allowing the seeded Free Electron Laser to be observed in the UV. Good agreement is found between measurements and simulations.  
DOI • reference for this paper ※ doi:10.18429/JACoW-FLS2023-TH2C1  
About • Received ※ 22 August 2023 — Revised ※ 29 August 2023 — Accepted ※ 30 August 2023 — Issued ※ 02 December 2023
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TH2C2 Development of Laser-Driven Plasma Accelerator Undulator Radiation Source at ELI-Beamlines laser, plasma, undulator, photon 237
 
  • A.Y. Molodozhentsev
    Czech Republic Academy of Sciences, Institute of Physics, Prague, Czech Republic
  • J.T. Green, P. Zimmermann
    ELI-BEAMS, Prague, Czech Republic
  • A. Jancarek, S.M. Maity, A. Mondal, S.N. Niekrasz, E. Vishnyakov
    ELI ERIC, Dolni Brezany, Czech Republic
  
  Over the last decade, the mechanism of the laser-plasma acceleration of electrons was studied intensively by many experimental teams aiming to achieve high-energy, high-quality electron beams required to generate high-brilliance incoherent and, as the next step, coherent undulator photon radiation for wide-range applications. The laser-driven plasma accelerator based compact undulator radiation source is currently under commissioning at ELI-Beamlines (Institute of Physics CAS, Czech Republic) in the frame of the LUIS project, which aims to deliver stable and reliable incoherent photon beam with a wavelength around 5 nm to an user-station. As the result of this project, the electron beam parameters should be improved to generate the coherent photon radiation reaching the saturation of the photon pulse energy in a single-unit dedicated undulator (LPA-based FEL). An overview of the current status of the LUIS project will be presented, including the high-power high-repetition rate laser, acceleration of the electron beam in the plasma channel, the electron and photon beam-lines with relevant diagnostics. Challenges and future development beyond the LUIS project also being discussed.  
slides icon Slides TH2C2 [3.474 MB]  
DOI • reference for this paper ※ doi:10.18429/JACoW-FLS2023-TH2C2  
About • Received ※ 23 August 2023 — Revised ※ 29 August 2023 — Accepted ※ 31 August 2023 — Issued ※ 02 December 2023
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TH3D3 How Can Machine Learning Help Future Light Sources? controls, operation, laser, feedback 249
 
  • A. Santamaria Garcia, E. Bründermann, M. Caselle, A.-S. Müller, L. Scomparin, C. Xu
    KIT, Karlsruhe, Germany
  • G. De Carne
    Karlsruhe Institute of Technology (KIT), Eggenstein-Leopoldshafen, Germany
  
  Machine learning (ML) is one of the key technologies that can considerably extend and advance the capabilities of particle accelerators and needs to be included in their future design. Future light sources aim to reach unprecedented beam brightness and radiation coherence, which require challenging beam sizes and accelerating gradients. The sensitive designs and complex operation modes that arise from such demands will impact the beam availability and flexibility for the users, and can render future accelerators inefficient. ML brings a paradigm shift that can re-define how accelerators are operated. In this contribution we introduce the vision of ML-driven facilities for future accelerators, address some challenges of future light sources, and show an example of how such methods can be used to control beam instabilities.  
slides icon Slides TH3D3 [5.398 MB]  
DOI • reference for this paper ※ doi:10.18429/JACoW-FLS2023-TH3D3  
About • Received ※ 23 August 2023 — Revised ※ 25 August 2023 — Accepted ※ 31 August 2023 — Issued ※ 02 December 2023
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TH4A2 A Compact Inverse Compton Scattering Source Based on X-band Technology and Cavity-enhanced High Average Power Ultrafast Lasers linac, photon, laser, scattering 257
 
  • A. Latina, R. Corsini, L.A. Dyks, E. Granados, A. Grudiev, V. Mușat, S. Stapnes, P. Wang, W. Wuensch
    CERN, Meyrin, Switzerland
  • E. Cormier
    CELIA, Talence, France
  • G. Santarelli
    ILE, Palaiseau Cedex, France
  
  A high-pulse-current photoinjector followed by a short high-gradient X-band linac and a Fabry-Pérot enhancement cavity are considered as a driver for a compact Inverse Compton Scattering (ICS) source. Using a high-power ultra-short pulse laser operating in burst mode in a Fabry-Pérot enhancement cavity, we show that outcoming photons with a total flux over 1013 and energies in the MeV range are achievable. The resulting high-intensity and high-energy photons allow various applications, including cancer therapy, tomography, and nuclear material detection. A preliminary conceptual design of such a compact ICS source and simulations of the expected performance are presented.  
slides icon Slides TH4A2 [2.962 MB]  
DOI • reference for this paper ※ doi:10.18429/JACoW-FLS2023-TH4A2  
About • Received ※ 22 August 2023 — Revised ※ 26 August 2023 — Accepted ※ 31 August 2023 — Issued ※ 02 December 2023
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TH4A4 A Proposal for Generating Fully Coherent X-ray FEL with Femtosecond Pulse Based on Fresh-Slice polarization, FEL, radiation, undulator 261
 
  • Z.F. Gao
    SSRF, Shanghai, People’s Republic of China
  • J.W. Yan
    EuXFEL, Schenefeld, Germany
  
  This study aims to propose a new principle for generating fully coherent femtosecond X-ray pulse on the Shanghai soft X-ray Free Electron Laser User Facility (SXFEL-UF), which was based on fresh-slice technique. The electron beam was kicked transversely to get a time-related transverse tilt. The sub-10-femtosecond bunch was achieved first because of the spatiotemporal synchronization effect of the seed laser modulation. Then the FEL pulse duration was even shorter because of harmonic lasing. In the cascaded HGHG mode, the laser generated by the beam tail modulated the beam head in the second stage to reach higher harmonics, while in the EEHG mode, the same part of the electron beam was modulated twice. The influence of emittance and energy chirp of the electron beam on the scheme was analyzed, and the instability caused by transverse position jitter and energy jitter of the chirped beam was evaluated. The relationship between the pulse duration and the transverse deflection of the beam is verified. The scheme is also explored to generate linearly polarized femtosecond pulse at 6 nm and circularly polarized femtosecond pulse at 3 nm simultaneously.  
slides icon Slides TH4A4 [3.281 MB]  
DOI • reference for this paper ※ doi:10.18429/JACoW-FLS2023-TH4A4  
About • Received ※ 21 August 2023 — Revised ※ 24 August 2023 — Accepted ※ 31 August 2023 — Issued ※ 02 December 2023
Cite • reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)