Electron bunch energy and phase feed-forward stabilization system for the Mark V RF-linac free-electron laser

Hadmack, Michael R.; Jacobson, Bryce; Kowalczyk, Jeremy M. D.; Lienert, Barry R.; Madey, J. M. J.; Szarmes, Eric B.

doi:10.1063/1.4809938

Cited by 2 publications

(2 citation statements)

References 12 publications

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“…Incoming electron bunches must be synchronized to the circulation time of laser pulses in the storage cavity, and any loss of beam synchronism in the scattering region will lead to reduced x-ray flux [28]. An active feed-forward stabilization system has been successfully integrated into the low-level rf subsystem of the MkV FEL [28,29]. This system, depicted in Fig.…”

Section: Feed-forward Phase and Amplitude Stabilizationmentioning

confidence: 99%

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Free-electron laser inverse-Compton interaction x-ray source

Niknejadi

Kowalczyk²,

Hadmack³

et al. 2019

Phys. Rev. Accel. Beams

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Free-electron lasers (FEL) and synchrotron sources of high brilliance x-rays have proven to be of tremendous value in basic and applied research. Inverse-Compton sources (ICS) can achieve brilliance matching the requirements of many applications pioneered at those FEL and synchrotron facilitiesincluding phase contrast imaging, macromolecular x-ray crystallography, and x-ray microscopy-but with size, cost, and complexity compatible with a small laboratory. The free-electron laser inverse-Compton interaction compact x-ray source at the University of Hawaii at Manoa is a unique approach to an ICS which employs an FEL as the laser source. We have measured a total average flux of 3.0 × 10 5 photons=second with an average brilliance of 2.0 × 10 7 photons=s mm 2 mrad 2 0.1% of bandwidth (BW) with a peak energy of 10.9 keV from the source. While these results are modest in comparison to the standards set by other IC sources, upgrades to the system have the potential to increase the total average flux to 9.2 × 10 11 photons=second with an average brilliance of 1.9 × 10 12 photons=s mm 2 mrad 2 0.1% BW: comparing more favorably to other sources. We discuss the scientific program, the progress made in design and development, and the achievements of the source to date. We also outline future upgrades and integration needed to yield an enabling source for emerging high brilliance x-ray applications.

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Section: Feed-forward Phase and Amplitude Stabilizationmentioning

confidence: 99%

“…Finally, the temporal synchronization of electron and laser pulses is achieved using the rf phase comparison method described in Sec. II D 2 and [29]. Figure 29 shows the detector signal as we changed the optical delay by scanning the trombone position (see Sec.…”

Section: B Measured X-ray Fluxmentioning

confidence: 99%

Free-electron laser inverse-Compton interaction x-ray source

Niknejadi

Kowalczyk²,

Hadmack³

et al. 2019

Phys. Rev. Accel. Beams

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Temporal synchronization of GHz repetition rate electron and laser pulses for the optimization of a compact inverse-Compton scattering x-ray source

Hadmack

Szarmes

Madey

et al. 2015

Nuclear Instruments and Methods in Physics Research Section A:

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The operation of an inverse-Compton scattering source of x-rays or gamma-rays requires the precision alignment and synchronization of highly focused electron bunches and laser pulses at the collision point. The arrival times of electron and laser pulses must be synchronized with picosecond precision. We have developed an RF synchronization technique that reduces the initial timing uncertainty from 350 ps to less than 2 ps, greatly reducing the parameter space to be optimized while commissioning the x-ray source. We describe the technique and present measurements of its performance.

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Electron bunch energy and phase feed-forward stabilization system for the Mark V RF-linac free-electron laser

Cited by 2 publications

References 12 publications

Free-electron laser inverse-Compton interaction x-ray source

Free-electron laser inverse-Compton interaction x-ray source

Temporal synchronization of GHz repetition rate electron and laser pulses for the optimization of a compact inverse-Compton scattering x-ray source

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