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Efficiency enhancement of nonlinear odd harmonics in thermal free electron laser
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10.1063/1.4803059
/content/aip/journal/jap/113/17/10.1063/1.4803059
http://aip.metastore.ingenta.com/content/aip/journal/jap/113/17/10.1063/1.4803059
View: Figures

Figures

Image of FIG. 1.
FIG. 1.

Axial velocity (solid line) and (dashed line) as a function of normalized ion-channel frequency for group I and group II orbits.

Image of FIG. 2.
FIG. 2.

Illustration of the effect of axial energy spread on the normalized efficiency at the fundamental and the third harmonic radiation in the presence of ion-channel guiding with . is the efficiency of cold beam.

Image of FIG. 3.
FIG. 3.

Variation in the saturation length of third harmonic radiation versus energy spread (solid line) and comparing it with the case of applying ion-channel guiding (dashed line).

Image of FIG. 4.
FIG. 4.

Variation in the efficiency of third harmonic radiation with variations in the start taper point and the taper slope; ion-channel frequency is and energy spread is .

Image of FIG. 5.
FIG. 5.

Variation of efficiency with axial distance showing the effect of longitudinal energy spread , ion channel, and wiggler magnetic field tapering. (a) group I orbits with ; (b) group II orbit with and ; (c) group II orbit with and .

Image of FIG. 6.
FIG. 6.

Variation of saturated third harmonic efficiency with axial energy spread; (dotted line) untapered wiggler and without ion-channel guiding, (dashed line) untapered wiggler with ion-channel frequency , (solid line) tapered wiggler with decreasing slope and with ion-channel frequency .

Image of FIG. 7.
FIG. 7.

The bunching parameter of third harmonic || as a function of distance for (a) a uniform beam; (b) a pre-bunched beam when and (c) . The efficiency of third harmonic versus distance for (d) a uniform beam; (e) a pre-bunched beam when and (f) .

Image of FIG. 8.
FIG. 8.

Variation in the bunching parameter of third harmonic versus (a) bunch width and (b) energy spread.

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/content/aip/journal/jap/113/17/10.1063/1.4803059
2013-05-03
2014-04-25
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Efficiency enhancement of nonlinear odd harmonics in thermal free electron laser
http://aip.metastore.ingenta.com/content/aip/journal/jap/113/17/10.1063/1.4803059
10.1063/1.4803059
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