Author: Deng, H.X.
Paper Title Page
MOP026
 Division-of-amplitude Photopolarimeter for Single-shot Measurement of Free Electron Laser at SDUV-FEL  
 
  • L. Feng, H.X. Deng, T. Zhang
    SINAP, Shanghai, People's Republic of China
  
  Division-of-amplitude photopolarimeter (DOAP) is generally used to measure the polarization-state of the pulse beam, which divides the incident beam into four separate beams, and all four Stokes parameters can be measured simultaneously. In this paper, a home-made DOAP instrument is applied to the experiment of polarization control at Shanghai deep ultraviolet FEL test facility. The results indicate that this instrument response fast and accurately while the polarization-state of the coherent FEL are switched, and it is well verify the cross-planar undulator technique experimentally.  
 
MOP070 Design Study for the PEHG Experiment at SDUV-FEL 219
 
  • C. Feng, H.X. Deng, B. Liu, D. Wang, X.T. Wang, M. Zhang, T. Zhang, W. Zhang, Z.T. Zhao
    SINAP, Shanghai, People's Republic of China
  
  Funding: This work was partially supported by National Natural Science Foundation of China (11475250, 11175240 and 11205234)
In this paper, design studies for the proof-of-principle experiment of the recently proposed phase-merging enhanced harmonic generation (PEHG) mechanism are presented. A dogleg and a new designed transverse gradient undulator should be added in the undulator system of SDUV-FEL to perform the phase-merging effect. With the help of 3D simulation codes, we show the possible performance of PEHG with the realistic parameters of SDUV-FEL.
* H. Deng, C. Feng, Phys. Rev. Lett. 111, 084801.
** C. Feng, H. Deng, D. Wang, Z. Zhao, New J. Phys.,16, 043021.
*** C. Feng, T. Zhang, H. Deng, Z. Zhao, Phys. Rev. ST Accel. Beams 17, 070701.
 		 
 
MOP072
 Preparation for the CPA-CHG Experiment at SDUV-FEL  
 
  • C. Feng, H.X. Deng, T. Lan, B. Li, B. Liu, D. Wang, X.T. Wang, Z.T. Zhao
    SINAP, Shanghai, People's Republic of China
  
  Chirped pulse amplification has been shown theoretically possible to generate ultra-short high intensity radiation pulses in a seeded FEL. To demonstrate the theoretical predictions, a CPA-CHG experiment is under preparation based on the SDUV-FEL recently. We will show the experiment layout, optical design studies and some preliminary measurement results of the optical systems in this paper.
* L. Yu, E. Johnson, D. Li, D. Umstader, Physical Review E 49 (1994) 4480
** C. Feng et al. Nuclear Instruments and Methods in Physics Research A 712 (2013) 113 		 
 
TUC04
 Experimental Demonstration of Seeded Free-electron Laser Spectrum Control using Corrugated Structure  
 
  • H.X. Deng, C. Feng, B. Liu, D. Wang, M. Zhang, T. Zhang, Z.T. Zhao
    SINAP, Shanghai, People's Republic of China
  
  Funding: This work was partially supported by the Major State Basic Research Development Program of China (2011CB808300) and the National Natural Science Foundation of China (11175240, 11205234 and 11322550).
Corrugated structures [*] hold promising prospects as beam linearizer, beam de-chirper and beam stabilizer for a high brightness LINAC, and thus enhance the FEL performance significantly. So far, several electron beam test experiments of corrugated structure have been carried out on LINACs at PAL [**] and BNL [***]. More recently, a passive control experiment of FEL spectrum, by using a pair of corrugated planes has been successfully accmoplished at SDUV-FEL, which is the first real FEL experimental demonstration of such wakefield structure applications. The physical design, numerical simulations, the vacuum chamber manufacture and the experiment results are presented in this paper.
* K. L. F. Bane and G. Stupakov, NIMA 690 (2012) 106-110.
** P. Emma, M. Venturini, K. L. F. Bane, et al., PRL. 112 (2014) 034801.
*** M. Harrison, et al., NaPAc 2013, Pasadena, USA. 		 
slides icon Slides TUC04 [8.562 MB]  
 
FRB01
 Phase-merging Enhanced Harmonic Generation for Seeded Free-electron Lasers  
 
  • H.X. Deng, C. Feng, D. Wang, Z.T. Zhao
    SINAP, Shanghai, People's Republic of China
  
  Funding: This work was partially supported by the Major State Basic Research Development Program of China (2011CB808300) and the National Natural Science Foundation of China (11175240, 11205234, and 11322550)
The recently proposed phase-merging enhanced harmonic generation (PEHG) mechanism [*, **] holds promising prospect for seeded free-electron lasers (FEL) in short-wavelength. A remarkable bunching efficiency at high harmonics can be accomplished by using PEHG mechanism. In this paper, the theoretical descriptions and numerical simulations of PEHG will be presented, including the more recent theoretical progresses and a potential proof-of-principle experiment at Shanghai deep ultraviolet FEL test facility.
* Haixiao Deng, Chao Feng, Phys. Rev. Lett. 111 (2013) 084801.
** Chao Feng, Haixiao Deng, Dong Wang, Zhentang Zhao, New Journal of Physics,16 (2014) 043021. 		 
slides icon Slides FRB01 [29.808 MB]