Spectral encoding of x-ray/optical relative delay

Bionta, Mina R.; Lemke, Henrik T.; Cryan, James; Glownia, James M.; Bostedt, Christoph; Cammarata, Marco; Castagna, Jean-Charles; Ding, Yuantao; Fritz, David; Fry, Alan; Krzywiński, J.; Messerschmidt, Marc; Schorb, Sebastian; Swiggers, Michelle; Coffee, Ryan

doi:10.1364/oe.19.021855

Cited by 131 publications

(119 citation statements)

References 19 publications

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“…However, RF based sources still suffer from a major complication: the synchronization between the laser oscillator and RF electronics. State of the art free electron laser facilities such as the Linac Coherent Light Source (LCLS) still report nominal timing jitter between laser and X-ray of 100-200 fs RMS, 14 and RF compressed electron sources have reported similar quantities. 12,13 However, work at LCLS has recently demonstrated that timing jitter can be mitigated by several single shot time stamping techniques.…”

mentioning

confidence: 99%

“…12,13 However, work at LCLS has recently demonstrated that timing jitter can be mitigated by several single shot time stamping techniques. [14][15][16][17][18] With electrons, electro-optic sampling techniques can be used in a similar fashion for bunch charges more than a few pC. 19 For the typical fC bunches used in UED (Ultrafast Electron Diffraction), no current technique is sensitive enough to determine the arrival time of individual pulses with respect to the excitation laser.…”

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confidence: 99%

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Single shot time stamping of ultrabright radio frequency compressed electron pulses

Gao

Jiang

Kassier

et al. 2013

Applied Physics Letters

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We demonstrate a method of time-stamping Radio Frequency compressed electron bunches for Ultrafast Electron Diffraction experiments in the sub-pC regime. We use an in-situ ultra-stable photo-triggered streak camera to directly track the time of arrival of each electron pulse and correct for the timing jitter in the radio frequency synchronization. We show that we can correct for timing jitter down to 30 fs root-mean-square with minimal distortion to the diffraction patterns, and performed a proof-of-principle experiment by measuring the ultrafast electron-phonon coupling dynamics of silicon

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confidence: 99%

mentioning

confidence: 99%

Single shot time stamping of ultrabright radio frequency compressed electron pulses

Gao

Jiang

Kassier

et al. 2013

Applied Physics Letters

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“…In this low-charge operation mode, an external pulse such as an optical laser can be adopted as a pump. However, the synchronization jitter between the pump and probe pulses is very challenging and many efforts have been made to solve this problem (see, e.g., [4], [5], and references therein).…”

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confidence: 99%

Femtosecond X-Ray Pulse Characterization in Free-Electron Lasers Using a Cross-Correlation Technique

et al. 2012

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We report the first measurements of x-ray single-pulse duration and two-pulse separation at the Linac Coherent Light Source using a cross-correlation technique involving x-rays and electrons. An emittance-spoiling foil is adopted as a very simple and effective method to control the output x-ray pulse. A minimum pulse duration of about 3 femtoseconds full width at half maximum has been measured together with a controllable pulse separation (delay) between two pulses. This technique provides critical temporal diagnostics for x-ray experiments such as x-ray pump-probe studies.

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“…In recent years various methods have been proposed and developed for accurate measurements of relative arrival times (Bionta et al, 2011;Tavella et al, 2011;Dü sterer et al, 2011; Ding et al, 2011;Dü sterer et al, 2011;Inubushi et al, 2012;Grguraš et al, 2012;Riedel et al, 2013). Among these methods, the THz streak camera (Itatani et al, 2002;Frü hling et al, 2009;Grguraš et al, 2012;Helml et al, 2014;Juranić et al, 2014b) is able to measure both the length and the arrival time of the photon pulses at wavelengths ranging from UV to hard X-ray.…”

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confidence: 99%

Simulation of FEL pulse length calculation with THz streaking method

Gorgisyan

Ischebeck

Prat

et al. 2016

J Synchrotron Radiat

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Having accurate and comprehensive photon diagnostics for the X-ray pulses delivered by free-electron laser (FEL) facilities is of utmost importance. Along with various parameters of the photon beam (such as photon energy, beam intensity, etc.), the pulse length measurements are particularly useful both for the machine operators to measure the beam parameters and monitor the stability of the machine performance, and for the users carrying out pumpprobe experiments at such facilities to better understand their measurement results. One of the most promising pulse length measurement techniques used for photon diagnostics is the THz streak camera which is capable of simultaneously measuring the lengths of the photon pulses and their arrival times with respect to the pump laser. This work presents simulations of a THz streak camera performance. The simulation procedure utilizes FEL pulses with two different photon energies in hard and soft X-ray regions, respectively. It recreates the energy spectra of the photoelectrons produced by the photon pulses and streaks them by a single-cycle THz pulse. Following the pulseretrieval procedure of the THz streak camera, the lengths were calculated from the streaked spectra. To validate the pulse length calculation procedure, the precision and the accuracy of the method were estimated for streaking configuration corresponding to previously performed experiments. The obtained results show that for the discussed setup the method is capable of measuring FEL pulses with about a femtosecond accuracy and precision.

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Spectral encoding of x-ray/optical relative delay

Cited by 131 publications

References 19 publications

Single shot time stamping of ultrabright radio frequency compressed electron pulses

Single shot time stamping of ultrabright radio frequency compressed electron pulses

Femtosecond X-Ray Pulse Characterization in Free-Electron Lasers Using a Cross-Correlation Technique

Simulation of FEL pulse length calculation with THz streaking method

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