Parametric Modeling of Transverse Phase Space of an RF Photoinjector

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Description

High brightness electron beam sources such as rf photo-injectors as proposed for SASE FELs must consistently produce the desired beam quality. We report the results of a study in which a combined neural network (NN) and first-principles (FP) model is used to model the transverse phase space of the beam as a function of quadrupole strength, while beam charge, solenoid field, accelerator gradient, and linac voltage and phase are kept constant. The parametric transport matrix between the exit of the linac section and the spectrometer screen constitutes the FP component of the combined model. The NN block provides the parameters ... continued below

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3 pages

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Hartman, E.; Sayyar-Rodsari, B.; Schweiger, C.A.; /Unlisted; Lee, M.J.; Lui, P. et al. January 24, 2008.

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Description

High brightness electron beam sources such as rf photo-injectors as proposed for SASE FELs must consistently produce the desired beam quality. We report the results of a study in which a combined neural network (NN) and first-principles (FP) model is used to model the transverse phase space of the beam as a function of quadrupole strength, while beam charge, solenoid field, accelerator gradient, and linac voltage and phase are kept constant. The parametric transport matrix between the exit of the linac section and the spectrometer screen constitutes the FP component of the combined model. The NN block provides the parameters of the transport matrix as functions of quad current. Using real data from SLAC Gun Test Facility, we will highlight the significance of the constrained training of the NN block and show that the phase space of the beam is accurately modeled by the combined NN and FP model, while variations of beam matrix parameters with the quad current are correctly captured. We plan to extend the combined model in the future to capture the effects of variations in beam charge, solenoid field, and accelerator voltage and phase.

Physical Description

3 pages

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  • Journal Name: Conf.Proc.C070625:3462,2007; Conference: Particle Accelerator Conference PAC07 25-29 Jun 2007, Albuquerque, New Mexico

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  • Report No.: SLAC-PUB-13095
  • Grant Number: AC02-76SF00515
  • Office of Scientific & Technical Information Report Number: 922595
  • Archival Resource Key: ark:/67531/metadc896723

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  • January 24, 2008

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  • Sept. 27, 2016, 1:39 a.m.

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  • Dec. 6, 2016, 3:36 p.m.

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Hartman, E.; Sayyar-Rodsari, B.; Schweiger, C.A.; /Unlisted; Lee, M.J.; Lui, P. et al. Parametric Modeling of Transverse Phase Space of an RF Photoinjector, article, January 24, 2008; [Menlo Park, California]. (digital.library.unt.edu/ark:/67531/metadc896723/: accessed September 20, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.