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Magnetic emittance suppression using a bucking coil for a dc photocathode electron gun
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10.1063/1.4772397
/content/aip/journal/rsi/83/12/10.1063/1.4772397
http://aip.metastore.ingenta.com/content/aip/journal/rsi/83/12/10.1063/1.4772397
View: Figures

Figures

Image of FIG. 1.
FIG. 1.

3D-CAD drawing of the solenoid lens.

Image of FIG. 2.
FIG. 2.

Magnetic field distributions as a function of the distance from the cathode. The open circles show the measured values, and the solid and dashed lines represent the results calculated using the ELF/magic and Poisson codes, respectively.

Image of FIG. 3.
FIG. 3.

Bucking coil exciting currents on which the leakage magnetic field on the cathode surface depend (a) and the peak magnetic field intensities (b) as a function of the exciting current of the main coil. The solid and dashed lines represent the results calculated using the ELF/magic and Poisson codes, respectively. The open circles represent the measured values.

Image of FIG. 4.
FIG. 4.

3D-CAD drawing of the emittance measurement setup.

Image of FIG. 5.
FIG. 5.

Measured emittance and measured leakage magnetic field on the cathode surface as a function of the exciting current of the bucking coil. The open circle and crosses represent the emittance and leakage field, respectively.

Image of FIG. 6.
FIG. 6.

The measured emittance with a zero exciting current and the optimal current for the bucking coil as a function of the electron beam size on the cathode. The open circles and crosses represent the emittance with a zero exciting and the optimal exciting current, respectively. The solid and dashed lines represent the fitting of the measured emittance versus the laser spot size with the zero exciting and optimal exciting currents, respectively.

Image of FIG. 7.
FIG. 7.

Calculated emittance and leakage magnetic field on the cathode surface as a function of the exciting current of the bucking coil. The open circles and crosses represent the emittance and leakage field, respectively.

Image of FIG. 8.
FIG. 8.

The calculated emittance with a zero exciting current and the optimal current of the bucking coil as a function of the electron beam size on the cathode. The open circles and crosses represent the emittance with zero exciting and the optimal exciting currents, respectively. The solid and dashed lines represent the measured emittance fitting line with zero exciting and optimal exciting currents, respectively.

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/content/aip/journal/rsi/83/12/10.1063/1.4772397
2012-12-20
2014-04-17
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Magnetic emittance suppression using a bucking coil for a dc photocathode electron gun
http://aip.metastore.ingenta.com/content/aip/journal/rsi/83/12/10.1063/1.4772397
10.1063/1.4772397
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