C - Compact Light Sources
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Progress on High Peak Current Laser Wakefield Electron Acceleration  
  • U. Schramm
    HZDR, Dresden, Germany
  Not only beam quality of laser wakefield accelerated electron beams but parameter control has been improved in recent years by individual optimization of electron injection and acceleration. We here present novel results of a scheme called tailored self-truncated ionization injection that allows for independent tuning of the injected bunch charge and the acceleration conditions, and results in unprecedented charges of up to 0.5 nC or peak currents exceeding 10s of kA with typical quasi monoenergetic spectra. Beam loading is demonstrated to improve beam parameters if properly controlled. Such bunches are ideal drivers for various radiation sources and potentially for lab-scale beam driven plasma wakefield accelerators.
J. Couperus et al., Nature Communications 8, 487 (2017)
A.Irman et al., Plasma Physics and Controlled Fusion, Proc. LPAW 2017 (2018)
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A Conceptual Design of a Compact Wakefield Accelerator for a High Repetition Rate Multi User X-ray Free-Electron Laser Facility  
  • J.G. Power
    ANL, Argonne, Illinois, USA
  This talk is about a conceptual design of a compact wakefield accelerator for a high repetition rate multi user X-ray Free-Electron Laser facility.  
slides icon Slides TUA1WC02 [29.101 MB]  
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The SPARC Lab Activity and Eupraxia European Program  
  • M. Ferrario
    INFN/LNF, Frascati (Roma), Italy
  On the wake of the results obtained so far at the SPARC_LAB test-facility at LNF, we are currently investigating the possibility to design and build a new multi-disciplinary user-facility, equipped with a soft X-ray Free Electron Laser (FEL) driven by a ~1 GeV high brightness linac based on plasma accelerator modules. It is in fact widely accepted by the international accelerator scientific community that a fundamental milestone towards the realization of a plasma driven future Linear Collider (LC) will be the integration of the new high gradient accelerating plasma modules in a FEL user facility, as proposed in the approved H2020 Design Study EuPRAXIA. This fundamental goal will be integrated in the LNF facility by using a high gradient X-band RF linac and the high power laser FLAME to drive Plasma Oscillations in the accelerator module. This activity is performed in synergy with the EuPRAXIA and CompactLight design studies. In this talk we report about the recent progresses in the on going European and National design studies and about opportunities and perspectives for the FEL community.  
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TUA2WC01 Transportation and Manipulation of a Laser Plasma Acceleration Beam 56
  • A. Ghaith, T. André, I.A. Andriyash, F. Blache, F. Bouvet, F. Briquez, M.-E. Couprie, Y. Dietrich, J.P. Duval, C. Herbeaux, N. Hubert, C.A. Kitegi, M. Labat, N. Leclercq, A. Lestrade, A. Loulergue, O. Marcouillé, F. Marteau, D. Oumbarek, P. Rommeluère, E. Roussel, M. Sebdaoui, K.T. Tavakoli, M. Valléau
    SOLEIL, Gif-sur-Yvette, France
  • S. Bielawski, C. Evain, C. Szwaj
    PhLAM/CERLA, Villeneuve d'Ascq, France
  • S. Corde, J. Gautier, G. Lambert, B. Mahieu, V. Malka, K.T. Phuoc, C. Thaury
    LOA, Palaiseau, France
  Funding: European Research Council advanced grant COXINEL - 340015
The ERC Advanced Grant COXINEL aims at demonstrating free electron laser amplification, at a resonant wavelength of 200 nm, based on a laser plasma acceleration source. To achieve the amplification, a 10 m long dedicated transport line was designed to manipulate the beam qualities. It starts with a triplet of permanent magnet with tunable gradient quadrupoles (QUAPEVA) that handles the highly divergent electron beam, a demixing chicane with a slit to reduce the energy spread per slice, and a set of electromagnetic quadrupoles to provide a chromatic focusing in a 2 m long cryogenic undulator. Electrons of energy 176 MeV were successfully transported throughout the line, where the beam positioning and dispersion were controlled efficiently thanks to a specific beam based alignment method, as well as the energy range by varying the slit width. Observations of undulator radiation for different undulator gaps are reported.
slides icon Slides TUA2WC01 [2.465 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-FLS2018-TUA2WC01  
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TUA2WC02 "LWFA-driven" Free Electron Laser for ELI-Beamlines 62
  • A.Y. Molodozhentsev, G. Korn, L. Pribyl
    Czech Republic Academy of Sciences, Institute of Physics, Prague, Czech Republic
  • A.R. Maier
    University of Hamburg, Hamburg, Germany
  Free-electron lasers (FEL) are unique light source for different applications on the femto-second scale, including for instance the most basic reaction mechanisms in chemistry, structural biology and condense physics. Laser wake field acceleration (LWFA) mechanism allow to produce extremely short electron bunches of a few fs length with the energy up to a few GeV providing peak current of many kA in extremely compact geometries. This novel acceleration method therefore opens a new way to develop compact "laser-based" FELs. ELI beamlines is an international user facility for fundamental and applied research using ultra-intense lasers and ultra-short high-energy electron beams. In frame of this report we present conceptual solutions for an compact "LFWA" based soft X-ray FEL, which can deliver a photon peak brightness of 1031 ph/sec/mm2/mrad2/0.1%bw. A combination of this achievement with novel laser technologies will open a new perspective for the development of extremely compact FELs with few or even sub-femtosecond photon bunches for a very wide user community.  
slides icon Slides TUA2WC02 [3.882 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-FLS2018-TUA2WC02  
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Progress Towards BELLA Center's Free Electron Laser Driven by a Laser Plasma Accelerator  
  • J. van Tilborg, M.V. Ambat, S.K. Barber, F. Isono, W. Leemans, C.B. Schroeder
    LBNL, Berkeley, California, USA
  Funding: This work is supported by the US DOE under Contract No. DE-AC02-05CH11231, the National Science Foundation under Grant No. PHY-1632796, and the Gordon and Betty Moore Foundation under Grant GBMF4898
I will present the latest BELLA Center efforts towards realizing a free-electron laser (FEL) driven by a laser plasma accelerator (LPA). In addition to simulation and modeling results performed to optimize FEL performance, the experimental status of the laser system, accelerator, electron beam transport line, and characterization of the undulator, will be addressed. Several of our recent publications play a critical role in the LPA FEL project: Parametric studies of the LPA emittance for two injection techniques based on a single-shot dispersive diagnostic* will be presented, and recent insight into the advantages and limitations of active plasma lenses** will be covered.
[*] S. K. Barber et al., Phys. Rev. Lett. 119, 104801 (2017)
[**] J. van Tilborg et al., Phys. Rev. Lett. 115, 148802 (2015), J. van Tilborg et al., Phys. Rev. Accel. Beams 115, 032803 (2017)
slides icon Slides TUA2WC03 [25.509 MB]  
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Status and Prospects for Plasma Accelerator Based Light Sources  
  • W. Lu
    TUB, Beijing, People's Republic of China
  In the past decade, the field of plasma based accelerators and light sources has witnessed remarkable progresses worldwide. In this talk, the current status of light sources based on plasma accelerators will be reviewed. For incoherent synchrotron like sources, the development and preliminary applications of Betatron and inverse-Compton X/Gamma-ray sources will be discussed. For coherent sources, the development of intense THz and Infrared sources based on plasma nonlinear optics, as well as EUV/X-ray sources based on FELs will be discussed, with an emphasis on the challenges and opportunities of compact FELs based on laser and beam driven wakefield accelerators. Particularly, the prospects of generating high quality electron beams with extremely high brightness in plasma accelerators and its implication for future light source development will be discussed in details.  
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WEA1PL02 Dielectric Accelerators and Other Non-Plasma Accelerator Based Compact Light Sources 74
  • R.J. England, Z. Huang
    SLAC, Menlo Park, California, USA
  Funding: U.S. Department of Energy DE-AC02-76SF00515; Gordon and Betty Moore Foundation GBMF4744
We review recent experimental progress in developing nanofabricated dielectric laser-driven accelerators and discuss the possibility of utilizing the unique sub-femtosecond electron pulse format these accelerators would provide to create ultra-compact EUV and X-ray radiation sources.
slides icon Slides WEA1PL02 [16.828 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-FLS2018-WEA1PL02  
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CEP-Stabilized Few-cycle MIR-FELs for Driving High-Repetition-Rate (>10 MHz) Attosecond X-ray Sources Based on HHG  
  • R. Hajima
    QST, Tokai, Japan
  Funding: This research was partially supported by the Research Foundation for Opto-Science and Technology.
High harmonic generation (HHG) is a well-established technology to produce attosecond pulses in VUV wavelengths. So far HHG sources have been driven by femtosecond solid-state lasers not FELs, because it has been believed that FELs have no ability to provide carrier-envelope-phase (CEP) stabilized few-cycle pulses essential to the HHG. Here, we propose a scheme to CEP stabilized few-cycle pulses from a FEL oscillator. Operated at a mid-infrared wavelength, the proposed method is able to drive a HHG photon source to produce isolated attosecond pulses at photon energies above 1 keV with a repetition > 10 MHz. The FEL-HHG photon source will open a door to full-scale experiments of attosecond X-ray pulses and push ultrafast laser science to the zeptosecond regime [1].
[1] R. Hajima and R. Nagai, Phys. Rev. Lett. 119, 204802 (2017)
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High-efficient XFELO Based on Optical Resonator with Self-modulated Q-factor  
  • C.-J. Jing, S.P. Antipov
    Euclid Beamlabs LLC, Bolingbrook, USA
  • S.P. Antipov
    ANL, Argonne, Illinois, USA
  • S.P. Antipov
    Euclid TechLabs, LLC, Solon, Ohio, USA
  • S.V. Kuzikov, A.V. Savilov
    IAP/RAS, Nizhny Novgorod, Russia
  • A.V. Savilov
    UNN, Nizhny Novgorod, Russia
  We suggest an efficient XFELO having a new non-stationary out-coupling scheme. It consisted of two undulator sections located in sequence with a free space gap in-between. The first section is a conventional uniform undulator, the second one is a tapered undulator. At start time point X-ray radiation is basically produced by the uniform section. Mirrors of XFELO's optical resonator are calculated so that diffraction Q-factor reaches the highest value, i.e losses asre near to zero. As X-ray power increases the tapered undulator begins to bring more contribution in radiation power. Finally, at a new steady state regime all power is being produced by the tapered section. Because mirrors were optimized for Gaussian wavebeam to be produced in the first section, in the final steady state regime a portion of X-ray power will be out-coupled missing partly the mirrors.  
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A 1d Time-Dependent Theoretical Model of X-Ray Free-Electron Laser Oscillator  
  • K. Li, H.X. Deng
    SINAP, Shanghai, People's Republic of China
  FEL is a cutting-edge tool for generating high brilliant, wavelength adjustable radiation. FEL oscillators (FELO) is one of FEL's operation mode. A novel simplified theoretical model for fast simulation and optimization of FELO is proposed. Instead of utilizing conventional macro particles tracking, i.e., GENESIS and OPC codes, the theoretical model takes advantage of low-gain theory to calculate single-pass gain analytically and it is able to considerably reduce calculation time, i.e., from several days to a few minutes. In addition, it is useful for simulating new FELO scheme such as gain cascading.  
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The CompactLight Project: Towards Compact Accelerators and Beyond  
  • G. D'Auria
    Elettra-Sincrotrone Trieste S.C.p.A., Basovizza, Italy
  CompactLight (XLS) is a three-year project, funded by EU in the context of the Horizon 2020 Programme (Research Infrastructures - Design Studies). The aim of the project, started in January 2018, is to design a hard X-ray FEL facility beyond today's state of the art, using the latest concepts for bright electron photo injectors, very high-gradient X-band structures operating at 12 GHz, and innovative compact short-period undulators. A consortium of 21 leading European institutions, including industry, together with 3 non-European institutes, are partnering up to achieve this ambitious goal. An overview of the project with the main organizational aspects and the expected outcomes will be reported.  
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WEP1WC02 CompactLight Design Study 85
  • A. Latina, D. Schulte, S. Stapnes, W. Wuensch
    CERN, Geneva, Switzerland
  • M. Aicheler
    HIP, University of Helsinki, Finland
  • A.A. Aksoy
    Ankara University Institute of Accelerator Technologies, Golbasi, Turkey
  • A. Bernhard
    KIT, Karlsruhe, Germany
  • J.A. Clarke
    STFC/DL/ASTeC, Daresbury, Warrington, Cheshire, United Kingdom
  • A.W. Cross
    USTRAT/SUPA, Glasgow, United Kingdom
  • G. D'Auria, R. Geometrante
    Elettra-Sincrotrone Trieste S.C.p.A., Basovizza, Italy
  • R.T. Dowd
    AS - ANSTO, Clayton, Australia
  • D. Esperante Pereira
    IFIC, Valencia, Spain
  • W. Fang
    SINAP, Shanghai, People's Republic of China
  • A. Faus-Golfe
    LAL, Orsay, France
  • M. Ferrario
    INFN/LNF, Frascati (Roma), Italy
  • E.N. Gazis
    National Technical University of Athens, Athens, Greece
  • R. Geometrante
    KYMA, Trieste, Italy
  • M. Jacewicz
    Uppsala University, Uppsala, Sweden
  • A. Mostacci
    Sapienza University of Rome, Rome, Italy
  • F. Nguyen
    ENEA C.R. Frascati, Frascati (Roma), Italy
  • F. Pérez
    ALBA-CELLS Synchrotron, Cerdanyola del Vallès, Spain
  • J.M.A. Priem
    VDL ETG, Eindhoven, The Netherlands
  • T. Schmidt
    PSI, Villigen PSI, Switzerland
  H2020 CompactLight Project aims at designing the next generation of compact hard X-Rays Free-Electron Lasers, relying on very high accelerating gradients and on novel undulator concepts. CompactLight intends to design a compact Hard X-ray FEL facility based on very high-gradient acceleration in the X band of frequencies, on a very bright photo injector, and on short-period/superconductive undulators to enable smaller electron beam energy. If compared to existing facilities, the proposed facility will benefit from a lower electron beam energy, due to the enhanced undulators performance, be significantly more compact, as a consequence both of the lower energy and of the high-gradient X-band structures, have lower electrical power demand and a smaller footprint. CompactLight is a consortium of 24 institutes (21 European + 3 extra Europeans), gathering the world-leading experts both in the domains of X-band acceleration and undulator design.  
slides icon Slides WEP1WC02 [12.831 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-FLS2018-WEP1WC02  
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Design of a Very Large Acceptance Compact Storage Ring  
  • A.I. Papash, E. Bründermann, A.-S. Müller, R. Ruprecht, M. Schuh
    KIT, Karlsruhe, Germany
  Design of a very large acceptance compact storage ring is underway at the Institute for Beam Physics and Technology of the Karlsruhe Institute of Technology (Germany). Combination of storage ring and a laser wake-field accelerator (LWFA) might be the basis for future compact light sources and advancing user facilities. Meanwhile the post-LWFA beam is not fitted for storage and accumulation in conventional storage rings. New generation rings with adapted features are required. Different geometries and lattices of a ring operating between 50 to 500 MeV energy range were investigated. The model suitable to store the post-LWFA beam with a wide momentum spread (2% to 3%) and ultra-short electron bunches of fs range was chosen as basis for further detailed studies. The DBA-FDF lattice with relaxed settings, split elements and high order optics of tolerable strength allows to improve the dynamic aperture up to 20 mm. The momentum acceptance of compact lattice exceeds 8% while dispersion is limited. The physical program includes turn-by-turn phase compression of a beam, crab cavities, dedicated alpha optics mode of operation, non-linear insertion devices etc.  
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THA1WC01 Compact Arc Compressor for FEL-Driven Compton Light Source and ERL-Driven UV FEL 183
  • S. Di Mitri
    Elettra-Sincrotrone Trieste S.C.p.A., Basovizza, Italy
  • J.A.G. Akkermans, I. Setija
    ASML Netherlands B.V., Veldhoven, The Netherlands
  • D. Douglas
    JLab, Newport News, Virginia, USA
  • C. Pellegrini
    SLAC, Menlo Park, California, USA
  • G. Penn, M. Placidi
    LBNL, Berkeley, California, USA
  Many research and applications areas require photon sources capable of producing extreme ultra-violet (EUV) to gamma-ray beams with reasonably high fluxes and compact footprints. We explore the feasibility of a compact energy-recovery linac EUV free electron laser (FEL)*, and of a multi-MeV gamma-rays source based on inverse Compton scattering from a high intensity UV FEL emitted by the electron beam itself. In the latter scenario, the same electron beam is used to produce gamma-rays in the 10-20 MeV range and UV radiation in the 1015 eV range, in a ~4x22 m2 footprint system.**
* J.Akkermans, S.Di Mitri, D.Douglas, I.Setija, PRAB 20, 080705 (2017).
** M. Placidi, S. Di Mitri,⁎, C. Pellegrini, G. Penn, NIM A 855 (2017) 55-60.
slides icon Slides THA1WC01 [5.258 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-FLS2018-THA1WC01  
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Inverse Free-Electron-Laser Based Inverse Compton Scattering: An All-Optical 5th Generation Light Source  
  • J.B. Rosenzweig
    UCLA, Los Angeles, California, USA
  Funding: U.S. DHS DNDO Contract No. 2014-DN-077-ARI084-01 and US DOE Grant No. DE-SC0009914
Compact monochromatic X-ray sources based on very high field acceleration and very short period undulators may revolutionize diverse advanced X-ray applications ranging from novel X-ray therapy techniques to active interrogation of materials, by making them accessible in cost and size. Such compactness may be obtained by an all-optical approach, which employs a laser-driven high gradient accelerator based on inverse free electron laser (IFEL), followed by an inverse Compton scattering (ICS) IP, a scheme where a laser is used as an undulator. We discuss experimental progress in understanding high-intensity effects in ICS, as well as the development of an efficient IFEL. We then describe the proof-of-principle of an all-optical IFEL-based system , where a TW-class CO2 laser pulse is split in two, with half used to accelerate a high quality electron beam up to 84 MeV through the IFEL interaction, and the other half acts as an electromagnetic undulator to generate up to 13 keV X-rays via ICS. These results demonstrate the feasibility of this scheme, which can be joined with other techniques such as laser recirculation to yield very compact, high brilliance, keV to MeV photon sources.
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Current Status and Perspectives of ERL-based Compton Sources  
  • R. Hajima
    QST, Tokai, Japan
  Funding: This work was supported in part by JSPS KAKENHI Grant Number 17H02818.
Energy-recover linacs (ERLs) have been developed mainly for high-power free electron lasers and future synchrotron light sources but have advantages in Compton sources as well, because the electron beam of high-average current and small emittance in ERLs contribute directly to generation of high-flux and narrow-bandwidth photons via Compton scattering. For demonstrating feasibility of ERL-based Compton sources, we conducted an experiment at the Compact ERL (cERL), where 7-keV X-ray photons with narrow bandwidth, 0.4% (rms) with an opening angle of 0.14 mrad, were generated by colliding an electron beam of 20 MeV with a laser of 1064 nm wavelength. In this talk, we overview the status of ERL-based Compton sources including relevant accelerator and laser components and discuss future perspectives of ERL-based Compton sources for keV and MeV photons.
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Ultra-short Period High Field Undultators for Compact Light Sources  
  • T. Kii
    Kyoto University, Kyoto, Japan
  Funding: This work was supported by the Grant-in-Aid for Scientific Research (A), Japan Society for the Promotion of Science (17H01127)
Generation of strong periodic magnetic field in short period is important technology for future advanced light sources such as free electron lasers and synchrotron radiation facilities. However, the period length and K-value of undulators are limited by the maximum energy product of permanent magnet or engineering critical current density of superconducting wire in general. In order to overcome these technological limit, use of bulk superconductor has been proposed. The critical current densities of rare earth barium copper oxide (REBCO) exceeds 10 kA/mm2 at low temperature. This value is about 10 times higher than the engineering critical current density of superconducting wire. The maximum trapped magnetic field by REBCO bulk superconductor exceeds 17 T *,**. If this high density supercurrent are fully handled, ultra-short period high field undulator is realized. In this presentation, I will introduce several approaches of bulk superconductor undulators and summarize the merit and the drawback of them, then the potential of the bulk superconductors will be discussed.
* M. Tomita and M. Murakami, Nature 421 pp. 517'520, 2003
** J. H. Durrell et al., Supercond. Sci. Technol. 27 082001, 2014
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Generation of a Wakefield Undulator in Plasma With Transverse Density Gradient  
  • G. Stupakov
    SLAC, Menlo Park, California, USA
  Funding: This work was supported by the U.S. Department of Energy under contracts No. DE-AC02-76SF00515.
We show that a short relativistic electron beam propagating in a plasma with a density gradient perpendicular to the direction of motion generates a wakefield in which a witness bunch experiences a transverse force. A density gradient oscillating along the beam path would create a periodically varying force'an undulator, with an estimated strength of the equivalent magnetic field more than ten Tesla. This opens an avenue for creation of a high-strength, short-period undulators, which eventually may lead to all-plasma, free electron lasers where a plasma wakefield acceleration is naturally combined with a plasma undulator in a unifying, compact setup.
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A Beam-Driven Short Wavelength Undulator for FEL  
  • C.-J. Jing
    Euclid TechLabs, LLC, Solon, Ohio, USA
  The idea of the beam-driven accelerators where intense electron beams are used directly to drive electromagnetic fields that accelerate probe or 'witness' electron beams has been known as the wakefield acceleraion for decades. This technology presents significant possibilities to accelerate electron beams in a multiGeV scale in a compact footprint. Here we unveil the next logical step in the application of wakefields, using intense electron beams to create fields that directly guide and periodically deflect 'witness" electrons, causing them to radiate photons. This is a new application of wakefield principles that may be used in the near future to develop compact undulators. The combination of a compact accelerator and a compact undulator could lead to a very compact x-ray free-electron laser in the future.  
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Summary Report: Compact Light Sources  
  • M.-E. Couprie
    SOLEIL, Gif-sur-Yvette, France
  This is the summary report of the compact light sources working group.  
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