scholarly journals Development of optical choppers for time-resolved measurements at soft X-ray synchrotron radiation beamlines

2017 ◽  
Vol 24 (3) ◽  
pp. 560-565 ◽  
Author(s):  
Hitoshi Osawa ◽  
Takuo Ohkochi ◽  
Masami Fujisawa ◽  
Shigeru Kimura ◽  
Toyohiko Kinoshita
Keyword(s):  
Synchrotron Radiation ◽  
Signal To Noise Ratio ◽  
High Vacuum ◽  
Magnetic Bearing ◽  
Ultra High Vacuum ◽  
Time Resolved ◽  
X Ray ◽  
Pump And Probe ◽  
Air Spindle ◽  
Time Resolved Measurements

Two types of optical choppers for time-resolved measurements at synchrotron radiation soft X-ray beamlines have been developed. One type uses an air-spindle-type rotation mechanism with a two-stage differential pumping system to maintain the ultra-high vacuum of the X-ray beamline, and the other uses a magnetic bearing. Both can be installed at the soft X-ray beamlines at SPring-8, greatly improving the accessibility of pump-and-probe spectroscopy. The combination of X-ray chopper and pump-and-probe photoemission electron microscope at SPring-8 provides drastic improvements in signal-to-noise ratio and resolution compared with techniques using high-voltage gating of channel plate detectors. The choppers have the capability to be used not only at synchrotron radiation facilities but also at other types of soft X-ray and VUV beamlines.

scholarly journals X-ray reflectivity with a twist: Quantitative time-resolved X-ray reflectivity using monochromatic synchrotron radiation

2019 ◽  
Vol 114 (8) ◽  
pp. 081904 ◽  
Author(s):  
Howie Joress ◽  
Shane Q. Arlington ◽  
Timothy P. Weihs ◽  
Joel D. Brock ◽  
Arthur R. Woll
Keyword(s):  
Synchrotron Radiation ◽  
Time Resolved ◽  
X Ray ◽  
Monochromatic Synchrotron

scholarly journals Laser power meters as an X-ray power diagnostic for LCLS-II

2018 ◽  
Vol 25 (1) ◽  
pp. 72-76 ◽  
Author(s):  
Philip Heimann ◽  
Stefan Moeller ◽  
Sergio Carbajo ◽  
Sanghoon Song ◽  
Georgi Dakovski ◽  
...  
Keyword(s):  
Free Electron Laser ◽  
Laser Power ◽  
High Vacuum ◽  
Average Power ◽  
Gas Analysis ◽  
Ultra High Vacuum ◽  
Beam Path ◽  
X Ray ◽  
High Repetition ◽  
Residual Gas

For the LCLS-II X-ray instruments, laser power meters are being developed as compact X-ray power diagnostics to operate at soft and tender X-ray photon energies. These diagnostics can be installed at various locations along an X-ray free-electron laser (FEL) beamline in order to monitor the transmission of X-ray optics along the beam path. In addition, the power meters will be used to determine the absolute X-ray power at the endstations. Here, thermopile power meters, which measure average power, and have been chosen primarily for their compatibility with the high repetition rates at LCLS-II, are evaluated. A number of characteristics in the soft X-ray range are presented including linearity, calibrations conducted with a photodiode and a gas monitor detector as well as ultra-high-vacuum compatibility tests using residual gas analysis. The application of these power meters for LCLS-II and other X-ray FEL sources is discussed.

scholarly journals The time-resolved hard X-ray diffraction endstation KMC-3 XPP at BESSY II

2021 ◽  
Vol 28 (3) ◽  
Author(s):  
Matthias Rössle ◽  
Wolfram Leitenberger ◽  
Matthias Reinhardt ◽  
Azize Koç ◽  
Jan Pudell ◽  
...  
Keyword(s):  
Storage Ring ◽  
Single Photon ◽  
Laser System ◽  
High Vacuum ◽  
Laser Pulses ◽  
Pixel Detector ◽  
X Ray Diffraction ◽  
Optical Pump ◽  
Time Resolved ◽  
X Ray

The time-resolved hard X-ray diffraction endstation KMC-3 XPP for optical pump/X-ray probe experiments at the electron storage ring BESSY II is dedicated to investigating the structural response of thin film samples and heterostructures after their excitation with ultrashort laser pulses and/or electric field pulses. It enables experiments with access to symmetric and asymmetric Bragg reflections via a four-circle diffractometer and it is possible to keep the sample in high vacuum and vary the sample temperature between ∼15 K and 350 K. The femtosecond laser system permanently installed at the beamline allows for optical excitation of the sample at 1028 nm. A non-linear optical setup enables the sample excitation also at 514 nm and 343 nm. A time-resolution of 17 ps is achieved with the `low-α' operation mode of the storage ring and an electronic variation of the delay between optical pump and hard X-ray probe pulse conveniently accesses picosecond to microsecond timescales. Direct time-resolved detection of the diffracted hard X-ray synchrotron pulses use a gated area pixel detector or a fast point detector in single photon counting mode. The range of experiments that are reliably conducted at the endstation and that detect structural dynamics of samples excited by laser pulses or electric fields are presented.

scholarly journals Element- and Time-Resolved Measurements of Spin Dynamics Using X-ray Detected Ferromagnetic Resonance

2020 ◽  
Vol 33 (2) ◽  
pp. 12-19
Author(s):  
Christoph Klewe ◽  
Qian Li ◽  
Mengmeng Yang ◽  
Alpha T. N’Diaye ◽  
David M. Burn ◽  
...  
Keyword(s):  
Ferromagnetic Resonance ◽  
Spin Dynamics ◽  
Time Resolved ◽  
X Ray ◽  
Time Resolved Measurements

Time-resolved X-ray diffraction from tendon collagen during creep using synchrotron radiation

1999 ◽  
Vol 32 (3) ◽  
pp. 285-292 ◽  
Author(s):  
Naoki Sasaki ◽  
Norifumi Shukunami ◽  
Norio Matsushima ◽  
Yoshinobu Izumi
Keyword(s):  
Synchrotron Radiation ◽  
X Ray Diffraction ◽  
Time Resolved ◽  
X Ray ◽  
Tendon Collagen

scholarly journals Soft X-ray lasing at 519.7 Å in a Recombining Z-pinch Plasma

1997 ◽  
Vol 15 (4) ◽  
pp. 589-595 ◽  
Author(s):  
E. Eberl ◽  
T. Wagner ◽  
J. Jacoby ◽  
A. Tauschwitz ◽  
D.H.H. Hoffmann
Keyword(s):  
Discharge Current ◽  
Line Intensity ◽  
Gas Pressure ◽  
Time Resolved ◽  
X Ray ◽  
Pinch Plasma ◽  
Gain Length ◽  
Z Pinch ◽  
Time Resolved Measurements

This paper is reviewing the amplification of XUV radiation at 519.7 and 498.5 Å with a gain-length product of 2.5 and 2.2 for the 4f-3d and 4d-3p transition in an oxygen Z-pinch plasma. Time resolved measurements of the O VI (519.7 Å) transition were performed and the dependence of the line intensity on the discharge current and initial gas pressure is reported.

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