Author: Deng, H.X.
Paper Title Page
MOPOR005 Longitudinal Wakefields in the Undulator Section of SXFEL User Facility 595
SUPSS052   use link to see paper's listing under its alternate paper code  
 
  • M. Song, H.X. Deng, C. Feng, D. Huang, B. Liu, D. Wang
    SINAP, Shanghai, People's Republic of China
  
  Shanghai soft x-ray free electron laser (SXFEL) user facility based on multi-stage seeded-FEL and self-amplified spontaneous emission (SASE) is recently proposed, which is aiming at generating 4-2nm fully-coherent, high-brightness FEL pulse. In this paper, the wakefields arise from the resistive wall and surface roughness in the vacuum chamber is obtained by theoretical models*. And the computations of geometric wakefields are carried out using ABCI**. According to the tracked beam profile, the overall wakefields in the undulator section of SXFEL user facility are presented.
* K. Bane, G. Stupakov, SLAC-PUB-15951, May 2014.
** ABCI website: http://abci.kek.jp/abci.htm 		 
DOI • reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-MOPOR005  
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MOPOW023 Proposal of an X-band Linearizer for Dalian Coherent Light Source 766
 
  • G.L. Wang, X.M. Yang, W.Q. Zhang
    DICP, Dalian, People's Republic of China
  • H.X. Deng, C. Feng
    SINAP, Shanghai, People's Republic of China
  
  Dalian coherent Light Source (DCLS) is a FEL user facility working at 50-150 nm, now under commissioning in Dalian, China. The facility based on HGHG mode, requires high brightness electron beam with small energy spread and low emittance. To linearise the longitudinal phase space before the bunch compression, an X-band linearizer is considered before the bunch compressor. In this paper, we study the performance improvement of DCLS FEL radiation by using such a harmonic cavity, including the jitter of central wavelength induced by arriving time and a larger bunch compression ratio for femtosecond FEL application.  
DOI • reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-MOPOW023  
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MOPOW024 Harmonic Lasing Options for Dalian Coherent Light Source 770
 
  • G.L. Wang, X.M. Yang, W.Q. Zhang
    DICP, Dalian, People's Republic of China
  • H.X. Deng, C. Feng
    SINAP, Shanghai, People's Republic of China
  
  Harmonic lasing of the Free Electron Laser can be achieved by disrupting the electron interaction with the usually dominant fundamental while allowing the increasing of a harmonic interaction. It's a cheap and relatively efficient way to extend the photon energy range of a particular FEL. In this paper, we discussed the possibility of harmonic lasing concept at Dalian Coherent Light Source by using the combination of tapered undulators and phase shifters. Our calculation shows that it's feasible with the present layout to provide intense, stable, and narrow-band harmonic radiation, the FEL wavelength could be down to 20 nm and the corresponding pulse energy is about 10 μJ.  
DOI • reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-MOPOW024  
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