Keyword: wiggler
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MOPB15 A Comparison of Front-End Design Requirements SRF, photon, vacuum, storage-ring 53
  • S.K. Sharma
    BNL, Upton, New York, USA
  Front ends of the NSLS-II storage ring have numerous design requirements to ensure equipment and personal safety aspects of their designs. These design requirements, especially many pertaining to ray tracings, have gradually become overly stringent and a review is underway to simplify them for building future front ends. As a part of this effort we have assembled the front-end design requirements used in several other light sources. In this paper the assembled design requirements are discussed in comparison with those currently in use at NSLS-II.  
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About • paper received ※ 20 July 2021       paper accepted ※ 01 October 2021       issue date ※ 10 November 2021  
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TUPA08 Performance of a Double Crystal Monochromator Prototype for HEPS under Water Cooling Condition at a Wiggler Beamline of BSRF SRF, synchrotron, experiment, hardware 135
  • H. Liang, W.F. Sheng, H. Shi, Y.M. Yang, L.R. Zheng
    IHEP, Beijing, People’s Republic of China
  Funding: This research is supported by National Natural Science Foundation of China (NSFC) (No.11905243).
The performance of monochromator is crucial to the performance of a beamline, especially for a 4th genera-tion synchrotron light source. To find out the perfor-mance of the monochromator prototype built for the HEPS project, it was tested at a wiggler beamline of BSRF with water cooling. The cooling of the crystals was measured by rocking curve broadening at different energy and cooling seems to be not enough due to indium foils. The repeatability in 1 hour was about 0.1 eV. The energy drift in 9 hours after the beam hit the beam-line was 0.4 eV at the Cu K edge. The short-term stability was tested with synchrotron beam under various cooling condition, and results between 4.4 nrad to around 400 nrad were observed. In conclusion, some performances are satisfying, but further improvements should be carried out in the future.
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About • paper received ※ 06 August 2021       paper accepted ※ 15 October 2021       issue date ※ 03 November 2021  
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WEPB17 A Fast Simulation Tool to Calculate Spectral Power Density Emitted by Wigglers and Short Insertion Devices photon, electron, SRF, radiation 303
  • J. Reyes-Herrera, M. Sanchez del Rio
    ESRF, Grenoble, France
  The analysis of thermal stress of beamline components requires a comprehensive determination of the absorbed power profile. Consequently, accurate calculations of beam power density and its dependency on the photon energy are required. There exist precise tools to perform these calculations for undulator sources, like several methods available in the OASYS toolbox* considering, for example, the contribution of the different harmonics of the undulator radiation or using ray-tracing algorithms**. This is not the case for wiggler sources, in particular for short insertion devices that are used as source for the bending magnet beamlines in some upgraded storage rings like the ESRF-EBS. Wiggler radiation is incoherent and although it is possible the use of undulator methods for calculating it, this is very inefficient. In this work, we describe a tool that performs fast calculations of spectral power density from a wiggler source. The emission is calculated starting from a tabulated magnetic field and computes the power spatial and spectral density. It uses concepts inspired from Tanaka’s work***. It is implemented in a user-friendly widget in OASYS and can be connected to widgets to calculate absorbed and transmitted power density along the beamline components. The accuracy of the method is verified by calculating three examples and comparing the results with ray-tracing. The three insertion devices simulated are: the EBS-ESRF-3PW, the ESRF W150 (a high power wiggler) and the 3PW for the BEATS project at the SESAME synchrotron source.
*L. Rebuffi, M. Sanchez del Rio, Proc. SPIE 10388: 130080S (2017).
**L. Rebuffi et al., J Synchrotron Rad, 27, 1108-1120 (2020).
***T. Tanaka, H. Kitamura, AIP Conference Proceedings 705, 41 (2004).
DOI • reference for this paper ※  
About • paper received ※ 28 July 2021       paper accepted ※ 28 September 2021       issue date ※ 09 November 2021  
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