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Absolute energy calibration for relativistic electron beams with pointing instability from a laser-plasma accelerator
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10.1063/1.4725530
/content/aip/journal/rsi/83/6/10.1063/1.4725530
http://aip.metastore.ingenta.com/content/aip/journal/rsi/83/6/10.1063/1.4725530
View: Figures

Figures

Image of FIG. 1.
FIG. 1.

Schematic of the experimental setup (M: mirror, L: lens).

Image of FIG. 2.
FIG. 2.

Top-view image of a self-guided plasma channel formed above a supersonic He gas jet nozzle having a length of 4 mm.

Image of FIG. 3.
FIG. 3.

Schematic showing the absolute energy calibration for an electron beam with pointing instability. The pointing angle θ is determined by measuring the distances a and b. The final distances x 0 and x are determined by the absolute electron energy E, the magnetic field strength B and the length d of the dipole magnet, and the distance f.

Image of FIG. 4.
FIG. 4.

Variation of the energy deviation between the absolute energy E and the misread energy E in terms of 1/E − 1/E as a function of the pointing angle.

Image of FIG. 5.
FIG. 5.

Spatial and spectral characteristics of two quasi-monoenergetic electron bunches incident on a dipole magnet at normal incidence in the horizontal direction. (a) Electron beam divergence and pointing measured on Lanex 2, (b) energy spectra measured on Lanex 1. The upper black region in (b) shows an energy scaler that is adjusted to normal incidence of an electron beam.

Image of FIG. 6.
FIG. 6.

Spatial and spectral characteristics of a quasi-monoenergetic electron bunch incident on a dipole magnet at an oblique angle in the horizontal direction. (a) Electron beam divergence and pointing measured on Lanex 2, (b) energy spectrum measured on Lanex 1. The upper black region in (b) shows an energy scaler that is adjusted to normal incidence of an electron beam.

Image of FIG. 7.
FIG. 7.

Variations of (a) the misread electron energies and (b), (c) ratios of the energy deviation to the energy corresponding to normal incidence on Lanex 1 as a function of the pointing angle of an electron beam on Lanex 2. The thin lines represent the calculation results not considering the fringe field effect and the thick lines represent the calculation results considering the fringe field effect. The results are based on the algorithm in Fig. 3. In the horizontal axes, the positive and negative values represent the pointing angles of electron beams incident to the left and right sides, respectively, with respect to normal incidence in Fig. 3. In (a), the electron energy range in the vertical axis is limited from 100 MeV to 1 GeV due to the resolving power of the permanent dipole magnet.

Image of FIG. 8.
FIG. 8.

(a) Energy spectra measured on Lanex 1 of an electron beam incident on Lanex 2 with normal incidence (Fig. 4) and (b) comparison of the energy spectrum measured on Lanex 1 with the calibrated one of an electron beam incident on Lanex 2 with oblique angle (Fig. 5).

Image of FIG. 9.
FIG. 9.

Variations of the energy resolutions of electron spectrometers as a function of the divergence angle of an electron beam on Lanex 2. The spectrometer parameters were (a) B = 1.5 T, a = 120 cm, and d = f = 40 cm and (b) B = 0.965 T, a = 10 cm, and d = f = 20 cm, respectively. The calculations were performed at the conditions that the pointing angles of electron beams were zero.

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/content/aip/journal/rsi/83/6/10.1063/1.4725530
2012-06-07
2014-04-17
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Absolute energy calibration for relativistic electron beams with pointing instability from a laser-plasma accelerator
http://aip.metastore.ingenta.com/content/aip/journal/rsi/83/6/10.1063/1.4725530
10.1063/1.4725530
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