Keyword: FEL
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MOA2PL03 Review of New Developments in Superconducting Undulator Technology at the APS ion, undulator, storage-ring, vacuum 1
 
  • J.D. Fuerst, E. Gluskin, Q.B. Hasse, Y. Ivanyushenkov, M. Kasa, I. Kesgin, Y. Shiroyanagi
    ANL, Argonne, Illinois, USA
 
  Funding: Work supported by the U.S. Department of Energy, Office of Science, under Contract No. DE-AC02-06CH11357.
Superconducting undulator (SCU) technology offers the possibility of enhancing the magnetic field of undulators compared to other undulator technologies. It also allows for the fabrication of circular polarizing devices in addition to the planar undulators. Work on SCUs therefore continues in the light source community. Recent developments in SCU technology will be presented.
 
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DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-FLS2018-MOA2PL03  
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MOP1WA02 The LCLS-II-HE, A High Energy Upgrade of the LCLS-II ion, linac, SRF, cryomodule 6
 
  • T.O. Raubenheimer
    SLAC, Menlo Park, California, USA
 
  The LCLS-II XFEL will be based on a 4 GeV CW SRF linac and will produce x-ray pulses at 1 MHz over the spectral range of 200 to 5,00 eV. The rf gun will be installed and tested in early 2018; cryomodules are being produced at Fermilab and Jefferson lab and shipped to SLAC; undulator segments are being fabricated at LBNL and measured at SLAC. In parallel, a High Energy upgrade will be described which would extend the linac to 8 GeV and increase the spectral range to 12.8 keV.  
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DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-FLS2018-MOP1WA02  
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TUP1WD02 A Study on the Improved Cavity Bunch Length Monitor for FEL ion, cavity, simulation, electron 39
 
  • Q. Wang, X.Y. Liu, P. Lu, Q. Luo, B.G. Sun, L.L. Tang, J.H. Wei, F.F. Wu, Y.L. Yang, T.Y. Zhou, Z.R. Zhou
    USTC/NSRL, Hefei, Anhui, People's Republic of China
 
  Funding: Supported by The National Key Research and Development Program of China (2016YFA0401900), NSFC (11375178, 11575181) and the Fundamental Research Funds for the Central Universities (WK2310000046)
Bunch length monitors based on cavities have great potential especially for future high quality beam sources because of many advantages such as simple structure, wide application rage, and high signal-to-noise ratio (SNR). The traditional way to measure bunch length needs two cavities at least. One is reference cavity, whose function is to get the beam intensity. The other one is defined as main cavity, which is used to calculate the bunch length. There are some drawbacks. To improve performance, the mode and the cavity shape are changed. At the same time, the position and orientation of coaxial probe are designed to avoid interference modes which come from the cavity and beam tube according to the analytic formula of the electromagnetic field distribution. A series simulation based on CST is performed to verify the feasibility, and the simulation results reveal that the improved monitor shows good performance in bunch length measurement.
 
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TUP1WD03 The Development and Applications of the Digital BPM Signal Processor at SINAP ion, cavity, SRF, brilliance 43
 
  • L.W. Lai, S.S. Cao, F.Z. Chen, Y.B. Leng, Y.B. Yan, W.M. Zhou
    SSRF, Shanghai, People's Republic of China
  • J. Chen, Y.B. Leng, Y.B. Yan, W.M. Zhou
    SINAP, Shanghai, People's Republic of China
 
  BPM signal processor is one of key beam diagnostics instruments. It has been progressing from analog to digital. The current major processors are digital BPM signal processor (DBPM). Except for some commercial products on-the-shelf, several laboratories developed in-house DBPMs for their own facilities. SINAP started the DBPM development since 2009, when the SSRF phase-I has been completed. After years of optimization, the DBPM has been used in large-scale on some facilities, including SSRF, DCLS and SXFEL. At the same time, some extended functions have been developed to meet special applications on accelerator based on the hardware platform. This topic will introduce the development and applications of the DBPM at SINAP, also the future DBPM development for next generation light source will be discussed here.  
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TUA2WC02 "LWFA-driven" Free Electron Laser for ELI-Beamlines ion, electron, undulator, photon 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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TUP2WA03 Harmonic Lasing in X-Ray FELs: Theory and Experiment ion, undulator, electron, radiation 68
 
  • E. Schneidmiller, B. Faatz, M. Kuhlmann, J. Rönsch-Schulenburg, S. Schreiber, M. Tischer, M.V. Yurkov
    DESY, Hamburg, Germany
 
  Harmonic lasing in XFELs is an opportunity to extend operating range of existing and planned X-ray FEL user facilities*. Contrary to nonlinear harmonic generation, harmonic lasing can provide much more intense, stable, and narrow-band FEL beam which is easier to handle due to the suppressed fundamental. Another interesting application of harmonic lasing is Harmonic Lasing Self-Seeded (HLSS) FEL*,** that allows to improve longitudinal coherence and spectral power of a SASE FEL. Recently*** this concept was successfully tested at FLASH2 in the range 4.5 - 15 nm. That was also the first experimental demonstration of harmonic lasing in a high-gain FEL and at a short wavelength (before it worked only in infrared FEL oscillators). In this contribution we describe the concepts of harmonic lasing and of HLSS FEL, and present the experimental results from FLASH2.
* E.Schneidmiller and M.Yurkov, Phys. Rev. ST-AB 15(2012)080702
** E.Schneidmiller and M.Yurkov, Proc. of FEL2013, p.700
*** E.Schneidmiller et al., Phys. Rev. Accel. Beams 20(2017)020705
 
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DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-FLS2018-TUP2WA03  
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WEA1PL03 Attosecond Timing ion, laser, timing, electron 79
 
  • F.X. Kärtner
    Deutsches Elektronen Synchrotron (DESY) and Center for Free Electron Science (CFEL), Hamburg, Germany
  • K. Shafak
    CFEL, Hamburg, Germany
  • K. Shafak
    Cycle GmbH, Hamburg, Germany
  • M. Xin
    DESY, Hamburg, Germany
 
  Funding: This work was supported by DESY and the European Research Council under the European Union's Seventh Framework Program (FP/2007-2013) / ERC Grant Agreement No. 609920.
Photon-science facilities such as X-ray free-electron lasers (XFELs) and intense-laser facilities are emerging world-wide with some of them producing sub-fs X-ray pulses. These facilities are in need of a high-precision timing distribution system, which can synchronize various microwave and optical sub-sources across multi-km distances with attosecond precision. Here, we report on a synchronous laser-microwave network that permits attosecond precision across km-scale distances. This was achieved by developing new ultrafast timing metrology devices and carefully balancing the fiber nonlinearities and fundamental noise contributions in the system. New polarization-noise-suppressed balanced optical crosscorrelators and free-space-coupled balanced optical-microwave phase detectors for improved noise performance have been implemented. Residual second- and third-order dispersion in the fiber links are carefully compensated with additional dispersion-compensating fiber to suppress link-induced Gordon-Haus jitter and to minimize output pulse duration; the link power is stabilized to minimize the nonlinearity-induced jitter as well as to maximize the signal to noise ratio for locking.
 
slides icon Slides WEA1PL03 [5.888 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-FLS2018-WEA1PL03  
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WEP1WC02 CompactLight Design Study ion, undulator, electron, gun 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.  
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DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-FLS2018-WEP1WC02  
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WEA2WD03 Analysis of Electron Trajectories in Harmonic Undulator with SCILAB's Model Based Design Codes ion, undulator, simulation, electron 93
 
  • H. Jeevakhan, S. Kumar
    NITTTR, Bhopal, India
  • G. Mishra
    Devi Ahilya University, Indore, India
 
  Scilab's X-cos model-based simulation blocks has been used to simulate the trajectories of an electron traversing through an Harmonic undulator. The trajectory of electron along X and Y directions has been simulated from Numerical and analytical methods. Analysis given in the present paper is compared with the other codes. Parallel simulation of Harmonic undulator magnetic field along with trajectories of electron is given in the present analysis.  
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DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-FLS2018-WEA2WD03  
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WEA2WD04 Harmonic Undulator Radiation with Dual Non Periodic Magnetic Components ion, undulator, electron, radiation 98
 
  • H. Jeevakhan
    NITTTR, Bhopal, India
  • G. Mishra
    Devi Ahilya University, Indore, India
 
  Undulator radiation at third harmonics generated by harmonic undulator in the presence dual non periodic constant magnetic field. Electron trajectories along the x and y direction has been determined analytical and numerical methods. Generalized Bessel function is used to determine the intensity of radiation and Simpson's numerical method of integration is used to find the effect of constant magnetic fields. Comparison with previous analysis has also been presented.  
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DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-FLS2018-WEA2WD04  
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WEP2PT003 Undulator Phase Matching for the the European XFEL ion, undulator, electron, radiation 103
 
  • Y. Li, J. Pflüger
    XFEL. EU, Hamburg, Germany
 
  The undulator system in the European XFEL is mainly comprised 5-m long undulator segments and 1.1 m long intersections in between. In intersections the electron velocity is faster than it inside an undulator and the optical phase is detuned. The detune effect is also from the undulator fringe field where electron longitudinal speed also deviates from the oscillation condition. The total detune effect is compensated by a magnetic device called phase shifter, which is correspondingly set for a specific undulator gap. In this paper we introduce the method to set the phase shifter gap for each K parameter according to the measured magnetic field.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-FLS2018-WEP2PT003  
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WEP2PT008 Microbunching Instability Study in the Linac-Driven FERMI FEL Spreader Beam Line ion, linac, laser, electron 108
 
  • S. Di Mitri, S. Spampinati
    Elettra-Sincrotrone Trieste S.C.p.A., Basovizza, Italy
 
  Suppression of microbunching instability (MBI) along high brightness electron beam delivery systems is a priority for Free Electron lasers (FELs) aiming at very narrow bandwidth. The impact of MBI on FEL spectral brilliance is aggravated by the growing demand for multi-user FEL facilities, which adopt multi-bend switchyard lines traversed by high charge density electron beams. This study provides practical guidelines to switchyards design largely immune to MBI, by focusing on the FERMI FEL Spreader line. First, two MBI analytical models [1, 2] are successfully benchmarked along the accelerator. Being the second model flexible enough to describe an arbitrary multi-bend line, and found it in agreement with particle tracking and experimental results, it was used to demonstrate that a newly proposed Spreader optics provides unitary MBI gain while preserving the electron beam brightness.
[1] Z. Huang and K.-J. Kim, Phys. Rev. Special Topics - Accel. Beams 5, 074401 (2002)
[2] R.A. Bosch, K.J. Kleman, and J. Wu, Phys. Rev. Special Topics - Accel. Beams 11, 090702 (2008)
 
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-FLS2018-WEP2PT008  
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WEP2PT033 Conceptual Design of Superconducting Transverse Gradient Undulator for PAL-XFEL Beamline ion, undulator, operation, electron 142
 
  • S.J. Lee, J.H. Han
    PAL, Pohang, Kyungbuk, Republic of Korea
 
  Funding: This research was supported by Basic Science Research Program through the National Research Foundation of Korea(NRF) funded by the Ministry of Science, ICT \& Future Planning(2017R1C1B1012852)
Recently, the transverse gradient undulator (TGU) applications are suggested from the laser plasma wake-field accelerator (LPWA) to ultimate storage ring (USR). Especially for X-ray FEL, TGU can be used to generate the large bandwidth radiation (up to §I10{\percent}). In this proceeding, the review of PAL-XFEL beam parameters and TGU requirements was done to apply a variable large bandwidth operation to the PAL-XFEL beamlines. Also, the conceptual design of TGU, based on superconducting undulator (SCU) was proposed, and B-field calculation results were introduced for PAL-XFEL large bandwidth operation mode.
 
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WEP2PT050 Status of CAEP THz Free Electron Laser Oscillator ion, electron, laser, free-electron-laser 154
 
  • M. Li, T.H. He, C.L. Lao, P. Li, S.F. Lin, X. Luo, Q. Pan, L.J. Shan, X. Shen, H. Wang, J. Wang, D. Wu, D.X. Xiao, Y. Xu, X. Yang, P. Zhang, K. Zhou
    CAEP/IAE, Mianyang, Sichuan, People's Republic of China
 
  China Academy of Engineering Physics tera-hertz free electron laser (CAEP THz FEL, CTFEL) is the first THz FEL oscillator in China, which was jointly built by CAEP, Peking university and Tsinghua university. The stimulated saturation of the CTFEL was reached in August, 2017. This THz FEL facility consists of a GaAs photocathode high-voltage DC gun, a superconducting RF linac, a planar undulator and a quasi-concentric optical resonator. The terahertz laser's frequency is continuous adjustable from 2 THz to 3 THz. The average power is more than 10 W and the micro-pulse power is more than 0.1 MW.  
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THA1WC01 Compact Arc Compressor for FEL-Driven Compton Light Source and ERL-Driven UV FEL ion, emittance, electron, dipole 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.
 
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DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-FLS2018-THA1WC01  
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THP1WD02 LCLS-II Beam Containment System for Radiation Safety ion, electron, cavity, radiation 187
 
  • C.I. Clarke, J. Bauer, M. Boyes, Y. Feng, A.S. Fisher, R.A. Kadyrov, J.C. Liu, E. Rodriguez, M. Rowen, M. Santana-Leitner, F. Tao, J.J. Welch, S. Xiao
    SLAC, Menlo Park, California, USA
  • T.L. Allison, J. Musson
    JLab, Newport News, Virginia, USA
 
  Funding: Work supported by the U.S. Department of Energy under contract number DE-AC02-76SF00515 and DE-AC05-06OR23177.
LCLS-II is a new xFEL facility under construction at SLAC National Accelerator Laboratory with a superconducting electron linac designed to operate up to §I{1.2}{MW} of beam power. This generates more serious beam hazards than the typical sub-kW linac operation of the existing xFEL facility, Linac Coherent Light Source (LCLS). SLAC uses a set of safety controls termed the Beam Containment System (BCS) to limit beam power and losses to prevent excessive radiation in occupied areas. The high beam power hazards of LCLS-II necessitate the development of new BCS devices and a larger scale deployment than previously done at LCLS. We present the new radiation hazards introduced by LCLS-II and the design development for the BCS.
 
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FRA1PL01 Summary Report: Linac-Based Light Sources ion, experiment, simulation, linac 199
 
  • T.O. Raubenheimer
    SLAC, Menlo Park, California, USA
  • W. Decking
    DESY, Hamburg, Germany
  • L. Giannessi
    Elettra-Sincrotrone Trieste S.C.p.A., Basovizza, Italy
  • L. Giannessi
    ENEA C.R. Frascati, Frascati (Roma), Italy
  • H.-S. Kang
    PAL, Pohang, Kyungbuk, Republic of Korea
 
  This is the summary report of the linac-based light sources working group.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-FLS2018-FRA1PL01  
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