NAPAC2019 - List of Authors (Huang, C.-K.)

Paper	Title	Page
MOPLH22	Focusing Studies of an Electron Beam in Diamond Field Emitter Array Cathodes	217
	R.L. Fleming, H.L. Andrews, D. Gorelov, C.-K. Huang, D. Kim, J.W. Lewellen, K.E. Nichols, V.N. Pavlenko, E.I. Simakov LANL, Los Alamos, New Mexico, USA
	Funding: Los Alamos National Laboratory LDRD Program We present the simulations and test results for focusing studies performed on diamond field emitter array cathodes. This design utilized a simple variable-focus solenoidal lens in conjunction with a scanning wire technique in order to measure the beam spot size. The spot size was measured by scanning a thin copper wire across the beam in 1 µm increments, with voltage being measured and averaged at each location in order to map the location and intensity of the beam. Scans were taken at different distances away from the magnetic center of the lens, and show good agreement with our simulations of the beam. Ultimately this has allowed us to focus the beam to a spot size of 5.72 µm with an average current of 15.78 µA.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-NAPAC2019-MOPLH22
About •	paper received ※ 27 August 2019 paper accepted ※ 05 September 2019 issue date ※ 08 October 2019
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WEXBA4	Comparison of Numerical Methods for the Calculation of Synchrotron Radiation From Electrons
	F.Y. Li, B.E. Carlsten, R. Garimella, C.-K. Huang, T.J. Kwan LANL, Los Alamos, New Mexico, USA
	The phenomenon of synchrotron radiation from electrons is at the core of modern accelerator based light sources. While synchrotron radiation in the far field has been well established, the self-consistent beam dynamics due to the near-field synchrotron radiation becomes increasingly important as high-brightness beams and coherent light sources are developed. Since it is difficult to diagnose the near fields in experiments, accurate and efficient numerical methods are essential to the design of these light sources. Here, we investigate several existing methods for the calculation of the radiation near fields, including the finite difference method, the Lienard-Wiechert method and a novel near-field method. We compare the accuracy and efficiency of these methods in both 1D and multi-dimensions, for both steady-state and dynamic beam trajectories, both radiation field and space charge field, as well as for both coherent and incoherent fields. We also discuss a self-similarity feature in the synchrotron radiation that can be exploited to improve the calculation. Work supported by the LDRD program at LANL.
	Slides WEXBA4 [8.569 MB]
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Paper

Title

Page

Focusing Studies of an Electron Beam in Diamond Field Emitter Array Cathodes

217

R.L. Fleming, H.L. Andrews, D. Gorelov, C.-K. Huang, D. Kim, J.W. Lewellen, K.E. Nichols, V.N. Pavlenko, E.I. Simakov
LANL, Los Alamos, New Mexico, USA

Funding: Los Alamos National Laboratory LDRD Program
We present the simulations and test results for focusing studies performed on diamond field emitter array cathodes. This design utilized a simple variable-focus solenoidal lens in conjunction with a scanning wire technique in order to measure the beam spot size. The spot size was measured by scanning a thin copper wire across the beam in 1 µm increments, with voltage being measured and averaged at each location in order to map the location and intensity of the beam. Scans were taken at different distances away from the magnetic center of the lens, and show good agreement with our simulations of the beam. Ultimately this has allowed us to focus the beam to a spot size of 5.72 µm with an average current of 15.78 µA.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-NAPAC2019-MOPLH22

About •

paper received ※ 27 August 2019 paper accepted ※ 05 September 2019 issue date ※ 08 October 2019

Export •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

WEXBA4

Comparison of Numerical Methods for the Calculation of Synchrotron Radiation From Electrons

F.Y. Li, B.E. Carlsten, R. Garimella, C.-K. Huang, T.J. Kwan
LANL, Los Alamos, New Mexico, USA

The phenomenon of synchrotron radiation from electrons is at the core of modern accelerator based light sources. While synchrotron radiation in the far field has been well established, the self-consistent beam dynamics due to the near-field synchrotron radiation becomes increasingly important as high-brightness beams and coherent light sources are developed. Since it is difficult to diagnose the near fields in experiments, accurate and efficient numerical methods are essential to the design of these light sources. Here, we investigate several existing methods for the calculation of the radiation near fields, including the finite difference method, the Lienard-Wiechert method and a novel near-field method. We compare the accuracy and efficiency of these methods in both 1D and multi-dimensions, for both steady-state and dynamic beam trajectories, both radiation field and space charge field, as well as for both coherent and incoherent fields. We also discuss a self-similarity feature in the synchrotron radiation that can be exploited to improve the calculation.
Work supported by the LDRD program at LANL.

Slides WEXBA4 [8.569 MB]

Export •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)