FEL beam metrology with a gas-monitor detector

Gottwald, Alexander; Bobashev, S. V.; Hahn, Ulrich; Hoehl, Arne; Jastrow, U.; Richter, M.; Sorokin, A. A.; Tiedtke, K.

doi:10.1117/12.556289

Cited by 2 publications

(1 citation statement)

References 10 publications

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“…1. [29][30][31] Due to the homogeneous extraction field, the charged particles created within a single photon pulse represent, in the plane of the respective split electrode, a projection of the photon beam. The lengths z 1 and z 2 of this projection on each part of a split electrode define the corresponding signal ratio according to …”

Section: ͑1͒mentioning

confidence: 99%

Gas detectors for x-ray lasers

Tiedtke¹,

Feldhaus²,

Hahn³

et al. 2008

Journal of Applied Physics

164

128

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We have developed different types of photodetectors that are based on the photoionization of a gas at a low target density. The almost transparent devices were optimized and tested for online photon diagnostics at current and future x-ray free-electron laser facilities on a shot-to-shot basis with a temporal resolution of better than 100 ns. Characterization and calibration measurements were performed in the laboratory of the Physikalisch-Technische Bundesanstalt at the electron storage ring BESSY II in Berlin. As a result, measurement uncertainties of better than 10% for the photon-pulse energy and below 20 m for the photon-beam position were achieved at the Free-electron LASer in Hamburg ͑FLASH͒. An upgrade for the detection of hard x-rays was tested at the Sub-Picosecond Photon Source in Stanford.

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Section: ͑1͒mentioning

confidence: 99%

Gas detectors for x-ray lasers

Tiedtke¹,

Feldhaus²,

Hahn³

et al. 2008

Journal of Applied Physics

164

128

View full text Add to dashboard Cite

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Ultraviolet and vacuum-ultraviolet detector-based radiometry at the Metrology Light Source

Gottwald

Kroth

Richter

et al. 2010

Meas. Sci. Technol.

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The Metrology Light Source (MLS) is a low-energy electron storage ring owned by the Physikalisch-Technische Bundesanstalt. It is optimized for basic radiometry and radiometric applications in the wavelength range from the terahertz to the extreme-ultraviolet spectral regime. As one of the basic tasks, detector-based radiometry is performed with a cryogenic electrical substitution radiometer as a primary detector standard. For the spectral range between 40 and 400 nm, the detector calibration facility was moved from its former site at the BESSY II storage ring with the beginning of user operation at the MLS in early 2008. In combination with a dedicated normal-incidence monochromator beamline, the spectral responsivities of photodetectors can be determined with relative uncertainties ranging from 1.1% down to 0.2% in the ultraviolet and vacuum-ultraviolet wavelength range. The beamline has several options to minimize high-order effects and comes with reliable intensity monitoring systems. Extensive characterization of the beamline properties has led to a detailed uncertainty budget.

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FEL beam metrology with a gas-monitor detector

Cited by 2 publications

References 10 publications

Gas detectors for x-ray lasers

Gas detectors for x-ray lasers

Ultraviolet and vacuum-ultraviolet detector-based radiometry at the Metrology Light Source

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