Paper  Title  Page 

WEPB17  A Fast Simulation Tool to Calculate Spectral Power Density Emitted by Wigglers and Short Insertion Devices  303 


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 raytracing 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 ESRFEBS. 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 userfriendly 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 raytracing. The three insertion devices simulated are: the EBSESRF3PW, 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, 11081120 (2020). ***T. Tanaka, H. Kitamura, AIP Conference Proceedings 705, 41 (2004). 

DOI •  reference for this paper ※ https://doi.org/10.18429/JACoWMEDSI2020WEPB17  
About •  paper received ※ 28 July 2021 paper accepted ※ 28 September 2021 issue date ※ 09 November 2021  
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