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Method based on atomic photoionization for spot-size measurement on focused soft x-ray free-electron laser beams
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10.1063/1.2397561
/content/aip/journal/apl/89/22/10.1063/1.2397561
http://aip.metastore.ingenta.com/content/aip/journal/apl/89/22/10.1063/1.2397561
View: Figures

Figures

Image of FIG. 1.
FIG. 1.

Schematic diagram of the experimental setup.

Image of FIG. 2.
FIG. 2.

Two single-shot TOF spectra of neon (Ne), obtained from two subsequent FEL pulses, at low (dashed line) and high (solid line) numbers of ions generated per pulse.

Image of FIG. 3.
FIG. 3.

Absolute number of ions created per FEL pulse as a function of the absolute photon number per pulse. The solid line represents a fit curve according to Eq. (2). The dashed line depicts a linear dependency for comparison.

Image of FIG. 4.
FIG. 4.

value of the photon beam diameter , measured at different positions of the experimental chamber along the photon beam around the focus and at a target gas pressure of (●) and (▿). Data evaluation is based on saturation in the single photoionization of neon according to Fig. 3 and Eq. (2). The solid line represents a polynomial fit curve. The nonsolid lines display ray-trace simulations for the horizontal (dashed line) and vertical directions (dotted line) and the mean of both (dashed-dotted line).

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/content/aip/journal/apl/89/22/10.1063/1.2397561
2006-11-29
2014-04-17
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Method based on atomic photoionization for spot-size measurement on focused soft x-ray free-electron laser beams
http://aip.metastore.ingenta.com/content/aip/journal/apl/89/22/10.1063/1.2397561
10.1063/1.2397561
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