Author: Zhao, Z.T.
Paper Title Page
TUPPP017 Lattice Design of the SSRF Storage Ring with Superbend 1644
  • S.Q. Tian, B.C. Jiang, H.H. Li, M.Z. Zhang, W.Z. Zhang, Z.T. Zhao
    SINAP, Shanghai, People's Republic of China
  The SSRF storage ring is being investigated by upgrading with normal conducting superbend of 3 T. The bending magnets are shortened, and thus some additional straight sections with the length of about 2 m are created in the center of the arc cell. They can be used to install more insertion devices. The lattice adjustment and the optics design are presented in this paper, where much efforts are made to maintain the effective emittance along the ring with respect to the nominal optics.  
TUPPP018 Design and Commissioning of the Very Low Emittance Optics in the SSRF Storage Ring 1647
  • S.Q. Tian, J. Chen, B.C. Jiang, Y.B. Leng, H.H. Li, L.Y. Yu, M.Z. Zhang, W.Z. Zhang, Z.T. Zhao
    SINAP, Shanghai, People's Republic of China
  In synchrotron radiation light sources, there are continuous efforts to lower the storage ring emittance and thus increase its photon beam brightness. The lowest effective emittance of SSRF is found by a systematic method. Results of design and commissioning of this kind of optics are presented, of which the beam emittance is smaller than the nominal one by 1 nm.rad. The measured beam parameters agree well with the design ones.  
TUPPP056 Study of the Energy Chirp Effects on Seeded FEL Schemes at SDUV-FEL 1724
  • C. Feng, D. Wang, Z.T. Zhao
    SINAP, Shanghai, People's Republic of China
  Seeded free-electron laser (FEL) schemes hold great promise for generation of high brilliant radiation with a narrow bandwidth. Analysis with the idealized electron beam with constant current and energy indicate that both the high-gain harmonic generation (HGHG) and the echo-enabled harmonic generation (EEHG) can produce Fourier-transform limited radiation pulses. However, residual energy variations due to nonlinearity of the accelerator or energy modulations due to microbunching instability will be unavoidable and may broaden the bandwidth of the seeded FEL. In this paper, we study the energy chirp effects on both the HGHG and EEHG schemes. Analytic and simulation calculations are presented and compared with the experimental data. Results show that the coherence properties of the EEHG FEL may not be degraded by the energy chirp when properly choosing the parameters of the dispersion sections.  
TUPPP057 Design of a Wavelength Continuously Tunable Ultraviolet Coherent Light Source 1727
  • T. Zhang, D. Wang, Z.T. Zhao
    SINAP, Shanghai, People's Republic of China
  • X.M. Yang
    DICP, Dalian, People's Republic of China
  Funding: Work supported by National Natural Science Foundation of China (Grant No. 11075199)
Dalian Coherent Light Source (DCL) is a proposed FEL-based novel light source user facility, will be located in Dalian city, China. DCL will mainly servers on the field of molecular reaction dynamics, ultra-fast physical chemistry experiments, etc. Running on the High-Gain-Harmonic-Generation (HGHG) FEL mode, DCL is expected to cover the FEL wavelength from 50 nm to 150 nm, with the help of continuously tuning Optical Parametric Amplification (OPA) seed laser system, which wavelength can be varied between 240 nm and 360 nm. Numerical simulation shows that the FEL pulse energy of DCL can surpass 100 μJ, at the whole full range wavelength with the undulator tapering technology, and the photon number can be up to 1013 per pulse, which is sufficient for user experiments.
WEOBB01 Measurement of the Local Energy Spread of Electron Beam at SDUV-FEL 2143
  • C. Feng, J.H. Chen, H.X. Deng, T. Lan, B. Liu, D. Wang, X. Wang, M. Zhang, T. Zhang, Z.T. Zhao
    SINAP, Shanghai, People's Republic of China
  The slice energy spread of electron beam is a very important parameter for high gain free electron lasers (FELs) especially the seeded FELs. Because of its extremely small value, highly accurate measurement of the slice energy spread is rather challenging. In this paper, we propose a novel method to accurately measure the slice energy spread based on the coherent harmonic generation (CHG) scheme. This method has been demonstrated on the Shanghai deep ultraviolent FEL (SDUV-FEL), and the results show that the slice energy spread is about only 1.2keV at the exit of the 136MeV linac when the bunch compressor is off, and this value change to about 2.6keV when the bunch compressor is on.
* Chao Feng, et al, Phys. Rev. ST Accel. Beams 14, 090701 (2011)
slides icon Slides WEOBB01 [3.309 MB]  
Future Government-funded Accelerator Projects in Asia  
  • Z.T. Zhao
    SINAP, Shanghai, People's Republic of China
  The special session on industrial applications will consist of six 20-minute invited oral presentations, with a theme of Future Accelerator Applications and Designs. The talks should focus on future developments in government-funded R&D, medical, defense and security, material processing, accelerator-based instruments and advanced accelerators. The specific subject for your presentation is Future Government-funded Accelerator Projects and should discuss future prospects for large Government-funded accelerator projects that address physics R&D needs, ADS and HIF. It is suggested that the talk address the state-of-the-art of present applications in the field, highlighting necessary evolution to maintain the cutting edge. Possible future applications, together with their associated performance requirements, should be described. The enabling technologies and the prospects for closing the gap from the status today should be considered and used to define the needed R&D. Where appropriate, the technology transfer path to negotiate the valley of death and bring new applications and hardware to market could be discussed.  
slides icon Slides WEIC01 [11.973 MB]  
WEPPP065 Status of the SSRF Fast Orbit Feedback System 2855
  • B.C. Jiang, J. Hou, C.X. Yin, Z.T. Zhao
    SINAP, Shanghai, People's Republic of China
  The fast orbit feedback system with bandwidth up to 100Hz is under commissioning at SSRF. The main purposes of the system are to suppress the short term orbit stability under sub-micron level and to compensate the orbit distortions caused by changing gaps of the insertion devices. The layout of the system is described and the preliminary commissioning results are given out in this paper.