Peak Current Optimization for LCLS Bunch Compressor 2

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In this study, we calculate the effects of Coherent Synchrotron Radiation (CSR) in the LCLS bunch compression section BC2[3] on the resulting FEL performance, considering a realistic, strongly non-gaussian longitudinal charge distribution. The longitudinal chirping required for the bunch compression process leads to a non-linear, non-monotonous {delta}(z) functional dependence (Fig. 1 shows the current distribution and the energy offset along the bunch). We model this functional dependence by matching it to a cubic polynomial {delta} {approx} c{sub 0} + c{sub 1}z + c{sub 2}z{sup 2} + c{sub 3}z{sup 3}. During compression, the charge distribution in the z-{delta} plane will ''fold ... continued below

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3 pages

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Emma, P.; Kabel, A.C. & /SLAC May 9, 2005.

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In this study, we calculate the effects of Coherent Synchrotron Radiation (CSR) in the LCLS bunch compression section BC2[3] on the resulting FEL performance, considering a realistic, strongly non-gaussian longitudinal charge distribution. The longitudinal chirping required for the bunch compression process leads to a non-linear, non-monotonous {delta}(z) functional dependence (Fig. 1 shows the current distribution and the energy offset along the bunch). We model this functional dependence by matching it to a cubic polynomial {delta} {approx} c{sub 0} + c{sub 1}z + c{sub 2}z{sup 2} + c{sub 3}z{sup 3}. During compression, the charge distribution in the z-{delta} plane will ''fold over'', as shown in fig. 2. This leads to a cusp at each end of the current distribution I(z), as shown in figure 3. High |l'(z)| values will lead to high longitudinal CSR fields, with possible detrimental effects on the transverse projected and slice emittance as well as energy spread, possibly affecting FEL performance.

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3 pages

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  • Presented at the 9th European Particle Accelerator Conference (EPAC 2004), Lucerne, Switzerland, 5-9 Jul 2004

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  • Report No.: SLAC-PUB-11171
  • Grant Number: AC02-76SF00515
  • Office of Scientific & Technical Information Report Number: 890839
  • Archival Resource Key: ark:/67531/metadc881861

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  • May 9, 2005

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  • Sept. 21, 2016, 2:29 a.m.

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  • Nov. 30, 2016, 4:17 p.m.

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Emma, P.; Kabel, A.C. & /SLAC. Peak Current Optimization for LCLS Bunch Compressor 2, article, May 9, 2005; [Menlo Park, California]. (digital.library.unt.edu/ark:/67531/metadc881861/: accessed August 18, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.