<i>SIMPLEX</i>: simulator and postprocessor for free-electron laser experiments

Tanaka, Takashi

doi:10.1107/s1600577515012850

Cited by 34 publications

(20 citation statements)

References 23 publications

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“…Similar to GAT, we attached differential pumping chambers with 6 mmdiameter orifices to both sides of the GMs. The orifice size was determined so as to transmit more than 95% of the incident pulse energy (4 width of the beam size) at = 12.4 nm based on the simulation result using SIMPLEX (Tanaka, 2015).…”

Section: Figurementioning

confidence: 99%

A soft X-ray free-electron laser beamline at SACLA: the light source, photon beamline and experimental station

et al. 2018

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The design and performance of a soft X-ray free-electron laser (FEL) beamline of the SPring-8 Compact free-electron LAser (SACLA) are described. The SPring-8 Compact SASE Source test accelerator, a prototype machine of SACLA, was relocated to the SACLA undulator hall for dedicated use for the soft X-ray FEL beamline. Since the accelerator is operated independently of the SACLA main linac that drives the two hard X-ray beamlines, it is possible to produce both soft and hard X-ray FEL simultaneously. The FEL pulse energy reached 110 mJ at a wavelength of 12.4 nm (i.e. photon energy of 100 eV) with an electron beam energy of 780 MeV.

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Section: Figurementioning

confidence: 99%

A soft X-ray free-electron laser beamline at SACLA: the light source, photon beamline and experimental station

et al. 2018

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“…In the horizontal direction the acceptance is determined by the depth of the diffracting blades, which is typically limited up to 10 × g because of the difficulty in fabrication of a narrow trench. A size of the XFEL beams at the middle of the magnetic chicane was evaluated to be ~ 50 µm in full-width at half maximum (FWHM) at 10 keV through a numerical simulation with an FEL simulation code SIMPLEX (Tanaka, 2015). Therefore, a spatial acceptance of > 50 µm in both the directions is needed.…”

Section: Design Of Micro Channel-cut Crystalmentioning

confidence: 99%

A micro channel-cut crystal X-ray monochromator for a self-seeded hard X-ray free-electron laser

Osaka

Inoue

Kinjo

et al. 2019

J Synchrotron Radiat

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A channel‐cut Si(111) crystal with a channel width of 90 µm was developed for achieving reflection self‐seeding in hard X‐ray free‐electron lasers (XFELs). With the crystal a monochromatic seed pulse is produced from a broadband XFEL pulse generated in the first undulator section with an optical delay of 119 fs at 10 keV. The small optical delay allows a temporal overlap between the seed optical pulse and the electron bunch by using a small magnetic chicane for the electron beam placed between two undulator sections. Peak reflectivity reached 67%, which is reasonable compared with the theoretical value of 81%. By using this monochromator, a monochromatic seed pulse without broadband background in the spectrum was obtained at SACLA with a conversion efficiency from a broadband XFEL pulse of 2 × 10−2, which is ∼10 times higher than the theoretical efficiency of transmission self‐seeding using a thin diamond (400) monochromator.

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“…The FEL simulations have been carried out using the simulation code SIMPLEX [19] through the whole system from the first modulator to the radiator, in which tracking of the macroparticles in the six-dimensional phase space is carried out and thus the emittance increase effect is taken into account. Note that only a limited region around the bunch center having the peak current of 250 A has been simulated instead of the whole electron bunch, which is enough to evaluate the expected performance of the proposed scheme.…”

Section: Examplementioning

confidence: 99%

High gain harmonic generation free electron lasers enhanced by pseudoenergy bands

Tanaka

Kinjo

2017

Phys. Rev. Accel. Beams

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We propose a new scheme for high gain harmonic generation free electron lasers (HGHG FELs), which is seeded by a pair of intersecting laser beams to interact with an electron beam in a modulator undulator located in a dispersive section. The interference of the laser beams gives rise to a two-dimensional modulation in the energy-time phase space because of a strong correlation between the electron energy and the position in the direction of dispersion. This eventually forms pseudoenergy bands in the electron beam, which result in efficient harmonic generation in HGHG FELs in a similar manner to the well-known scheme using the echo effects. The advantage of the proposed scheme is that the beam quality is less deteriorated than in other existing schemes.

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SIMPLEX: simulator and postprocessor for free-electron laser experiments

Cited by 34 publications

References 23 publications

A soft X-ray free-electron laser beamline at SACLA: the light source, photon beamline and experimental station

A soft X-ray free-electron laser beamline at SACLA: the light source, photon beamline and experimental station

A micro channel-cut crystal X-ray monochromator for a self-seeded hard X-ray free-electron laser

High gain harmonic generation free electron lasers enhanced by pseudoenergy bands

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