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Electron bunch energy and phase feed-forward stabilization system for the Mark V RF-linac free-electron laser
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10.1063/1.4809938
/content/aip/journal/rsi/84/6/10.1063/1.4809938
http://aip.metastore.ingenta.com/content/aip/journal/rsi/84/6/10.1063/1.4809938
View: Figures

Figures

Image of FIG. 1.
FIG. 1.

Block diagram of the MkV feed-forward system: The signal chassis demodulates RF pulses sampled from the high power linac drive. A control computer acquires the pulse data from a digital oscilloscope and generates compensation waveforms. Two arbitrary waveform generators apply the correction to the respective amplitude or phase modulator for all subsequent pulses.

Image of FIG. 2.
FIG. 2.

Feed-forward system hardware layout: The RF signal chassis contains the reference amplifier, mixers, digital attenuator, and phase shifter. Power supplies and computer interface modules are also included.

Image of FIG. 3.
FIG. 3.

Feed-forward GUI: The graphical user interface (GUI) for the feed-forward system is implemented in wxPython running on Linux. The upper plot shows the raw sampled in-phase and quadrature signals, while the bottom plot shows the reconstructed amplitude and phase. System commands are issued using the buttons at the bottom of the window.

Image of FIG. 4.
FIG. 4.

Effect of phase compensation: The application of a feed-forward phase compensation waveform results in an 80% reduction in phase ripple.

Image of FIG. 5.
FIG. 5.

Laser spectrograms: Measured effect of feed-forward on laser performance (a) with phase compensation off and (b) with phase compensation enabled.

Image of FIG. 6.
FIG. 6.

Measured effect of the feed-forward system on laser performance. (a) The laser pulse power and (b) spectrum are computed as the integrals of the spectrogram plot in λ and , respectively. The compensation lengthens the pulse duration by 40%, while the spectrum narrows by 20%.

Image of FIG. 7.
FIG. 7.

Simulated laser cavity detuning curves for uncompensated phase perturbation (boxes), compensated phase perturbation (circles), and no phase perturbation (diamonds).

Image of FIG. 8.
FIG. 8.

Simulated laser pulse power evolution with (solid) and without (dashed) electron beam phase compensation.

Image of FIG. 9.
FIG. 9.

Simulated laser wavelength evolution with (solid) and without (dashed) electron beam phase compensation.

Image of FIG. 10.
FIG. 10.

Effect of amplitude compensation: Feed-forward phase and amplitude compensation result in an 85% RF power ripple reduction.

Image of FIG. 11.
FIG. 11.

Measured electron beam energy spectrum with no compensation (dotted), phase compensation alone (dashed), and phase and amplitude compensation (solid).

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/content/aip/journal/rsi/84/6/10.1063/1.4809938
2013-06-11
2014-04-18
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Electron bunch energy and phase feed-forward stabilization system for the Mark V RF-linac free-electron laser
http://aip.metastore.ingenta.com/content/aip/journal/rsi/84/6/10.1063/1.4809938
10.1063/1.4809938
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