Author: Takano, S.
Paper Title Page
Diagnostic Requirements for DLSRs (Diffraction Limited Synchrotron Radiation Sources)  
  • S. Takano
    JASRI, Hyogo, Japan
  • S. Takano, H. Tanaka
    RIKEN SPring-8 Center, Hyogo, Japan
  Synchrotron radiation sources are looking for performance upgrades by pursuing higher photon brilliance and coherence enabling innovations in various scientific and industrial fields. The trend is pushing the accelerator design to lower the beam emittance, towards the ultimate of diffraction limited condition in a short wavelength range of hard x-rays. This talk will overview the diagnostic requirements for DLSRs. For highlighted crucial diagnostic subjects, the talk will review the current performance of state-of-the-art diagnostic instruments. The talk will also show strategies to bridge the gaps achieving the diagnostic goals of the coming future light sources as well as technical challenges for the breakthrough.  
slides icon Slides THBO02 [4.178 MB]  
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WEBO03 Development of MTCA.4-Based BPM Electronics for SPring-8 Upgrade 469
  • H. Maesaka, T. Fukui
    RIKEN SPring-8 Center, Innovative Light Sources Division, Hyogo, Japan
  • H. Dewa, T. Fujita, M. Masaki, C. Saji, S. Takano
    JASRI/SPring-8, Hyogo-ken, Japan
  We have developed a new button-BPM readout electronics based on the MTCA.4 standard for the low-emittance upgrade of SPring-8 [*]. Requirements for the BPM system are a high single-pass BPM resolution of better than 100 µm for a 100 pC injected bunch to achieve first-turn steering in the commissioning of the upgraded ring and a highly stable COD BPM within 5 µm error for 1 month to maintain the optical axis of brilliant x-rays for users [**]. We designed an rf front-end rear transition module (RTM) having band-pass filters, low-noise amplifiers, step attenuators, and calibration tone generators. The rf signal is detected by a 16-bit 370 MSPS high-speed digitizer advanced mezzanine card (AMC) developed for the new low-level rf system of SPring-8 [***]. The firmware of the FPGA on the digitizer AMC was newly developed to implement various functions of the BPM system. We evaluated the readout system at a laboratory and then tested at the present SPring-8 storage ring with a prototype BPM head for the SPring-8 upgrade. We confirmed that the new readout system satisfies the requirements for the single-pass BPM resolution and the COD BPM stability.
* SPring-8-II Conceptual Design Report,
** H. Maesaka et al., Proc. IBIC’18, paper TUOC04.
*** T. Ohshima et al., Proc. IPAC’17, paper THPAB117.
slides icon Slides WEBO03 [3.340 MB]  
DOI • reference for this paper ※  
About • paper received ※ 04 September 2019       paper accepted ※ 08 September 2019       issue date ※ 10 November 2019  
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