Author: Huang, Z.
Paper Title Page
MOZBA4 Recent Developments in High Power High Brightness Double Bunch Self-Seeding at LCLS-II 67
TUPLH12   use link to see paper's listing under its alternate paper code  
 
  • A. Halavanau, F.-J. Decker, Y. Ding, C. Emma, Z. Huang, A.A. Lutman, G. Marcus, C. Pellegrini
    SLAC, Menlo Park, California, USA
  
  We discuss the power and spectral characteristics of an X-ray FEL, LCLS-II, operating in a double bunch self-seeding scheme (DBFEL). We show that it can reach very high power levels in the photon energy range of 4-8 keV. We discuss the system implementation on LCLS-II, including the design of a four-bounce crystal monochromator, and linac wakefields effects. Finally, we offer multiple applications of the DBFEL for high-field QED, AMO physics and single particle imaging.  
slides icon Slides MOZBA4 [3.175 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-NAPAC2019-MOZBA4  
About • paper received ※ 02 September 2019       paper accepted ※ 05 September 2019       issue date ※ 08 October 2019  
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TUYBA6
 Attosecond Pulses and Advanced Techniques Planned for LCLS-II  
 
  • Z. Zhang, J.P. Duris, Z. Huang, J.P. MacArthur, A. Marinelli
    SLAC, Menlo Park, California, USA
  
  Attosecond X-ray free-electron laser (XFEL) pulses can be generated by the chirp-taper technique at the LCLS-II. The electron beam is modulated through the self-modulation process in a wiggler and the taper of the undulator is optimized to amplify the XFEL pulse along the beam. In this paper, we present start-to-end numerical simulations to demonstrate the generation of two kinds of attosecond XFEL pulses at the LCLS-II: (1) two attosecond XFEL pulses with variable time delay and energy separation, and (2) isolated attosecond pulses with TW peak power. The output of this method provides a powerful tool for users to study ultrafast science at the attosecond timescale.  
slides icon Slides TUYBA6 [3.586 MB]  
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THYBA5 Study of Fluctuations in Undulator Radiation in the IOTA Ring at Fermilab 934
SUPLH03   use link to see paper's listing under its alternate paper code  
TUPLH13   use link to see paper's listing under its alternate paper code  
 
  • I. Lobach
    University of Chicago, Chicago, Illinois, USA
  • A. Halavanau, Z. Huang, V. Yakimenko
    SLAC, Menlo Park, California, USA
  • K. Kim
    ANL, Lemont, Illinois, USA
  • V.A. Lebedev, S. Nagaitsev, A.L. Romanov, G. Stancari
    Fermilab, Batavia, Illinois, USA
  • A.Y. Murokh
    RadiaBeam, Marina del Rey, California, USA
  • T.V. Shaftan
    BNL, Upton, New York, USA
  
  We study turn-by-turn fluctuations in the number of emitted photons in an undulator, installed in the IOTA electron storage ring at Fermilab, with an InGaAs PIN photodiode and an integrating circuit. In this paper, we present a theoretical model for the experimental data from previous similar experiments and in our present experiment, we attempt to verify the model in an independent and a more systematic way. Moreover, in our experiment we consider the regime of very small fluctuation when the contribution from the photon shot noise is significant, whereas we believe it was negligible in the previous experiments. Accordingly, we present certain critical improvements in the experimental setup that let us measure such a small fluctuation.  
slides icon Slides THYBA5 [8.048 MB]  
poster icon Poster THYBA5 [3.079 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-NAPAC2019-THYBA5  
About • paper received ※ 24 August 2019       paper accepted ※ 05 September 2019       issue date ※ 08 October 2019  
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FRXBA5 The Role of Laser Shaping in Microbunching Instability Suppression and Seeded X-Ray Free Electron Emission 990
SUPLM09   use link to see paper's listing under its alternate paper code  
 
  • J. Tang, S. Carbajo, F.-J. Decker, Z. Huang, J. Krzywiński, R.A. Lemons, W. Liu, A.A. Lutman, G. Marcus, T.J. Maxwell, S.P. Moeller, D.F. Ratner, S. Vetter
    SLAC, Menlo Park, California, USA
  
  Microbunching instability (MBI) driven by collective effects in an accelerator is known to be detrimental for the performance of X-ray free electron lasers. At the Linac Coherent Light Source (LCLS), laser heater (LH) system was installed to suppress the microbunching instability by inducing a small amount of slice energy spread to the electron beam. The distribution of the induced energy spread greatly effects MBI suppression and can be controlled by shaping the transverse profile of the heater laser. In this paper, we present theoretical and experimental results on utilizing a Laguerre-Gaussian 01 Mode (LG01) laser at LCLS to obtain better suppression of the instability. We demonstrate experimentally that Gaussian-shaped energy distribution is induced by LG01 mode LH and final microbunching gain is better suppressed. We finally discuss the role of LH spatial shaping in soft X-ray self-seeded (SXRSS) FEL emission and demonstrate that this LH configuration is capable of generating high spectral brightness FEL pulses.  
slides icon Slides FRXBA5 [3.162 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-NAPAC2019-FRXBA5  
About • paper received ※ 28 August 2019       paper accepted ※ 12 September 2019       issue date ※ 08 October 2019  
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