qRIXS Capabilities

qRIXS Early Science Capabilities for Run 24

The qRIXS Instrument is a large-scale x-ray emission spectrometer, designed for cutting-edge time-resolved resonant inelastic x-ray scattering experiments on condensed matter systems.  It consists of the Sample Chamber and a 6-meter long Spectrometer arm. The Chamber is also suitable for experiments focusing on X-ray Diffraction/Resonant Elastic X-ray Scattering, X-ray reflectivity, and X-ray Absorption Spectroscopy.  The following capabilities will be provided:

• Sample positioning on an in-vacuum diffractometer, 6 degrees of freedom, sphere of confusion <50 microns
• At the moment only bulk samples and thin films on substrates will be considered
• A load-lock chamber  
• Sample cooling, ~ 25 K
• Diagnostic paddle for calibration targets, spatio-temporal overlap, etc.
• Laser in- and out- coupling (in co-linear configuration)
• Detectors optimized for x-ray absorption and diffraction
• Arrival time monitor located ~1.5 m from the interaction point
• For this Run, experiments carried out at a fixed qRIXS spectrometer angle will be supported.

qRIXS operations in Run 24 will be focused on standard user experiments. Depending on the commissioning results in Run 23, we might schedule Early Science with the LCLS-II superconducting linac at the beginning of Run 24. The Early Science program will be led by the LCLS Materials Sciences Department. If you have interest in participating in the Early Science Program please consider sending a letter of intent to the Materials  Sciences department head Apurva Mehta (mehta@slac.stanford.edu) who will coordinate this effort. The department head will work with the user community to develop an LCLS-led Early Science campaign. In preparation for these efforts the following tables summarize the expected x-ray and laser capabilities for the SC accelerator and CARBIDE laser system. The development team(s) will try to provide the largest array of possible capabilities. Please use these tables to guide your thinking on possible Early Science experiments.

Performance Parameters for Run 24

The following detectors will be provided to the users:

• Avalanche PhotoDiodes (APD) and Large area photodiodes.  The APDs are single-photon sensitive fast detectors suitable for X-ray Absorption Spectroscopy (XAS) in Total Fluorescence Yield (TFY) mode, and for X-ray Diffraction.  These detectors will be mounted on an in-vacuum rotatable stage (2-theta arm) and can be placed in the horizontal scattering plane.
• qRIXS spectrometer (Archon).
  • The archon CCD pixel dimensions are 1200x4224 px. Dispersion is along the long axis.
  • Modes available:
    • 2D mode which is binned by 2px along the short axis, i.e. 600 x 4224 px at a frame rate of 1 Hz.
    • 1D mode which is full vertical binning along the short axis, i.e. 1x4224 at a frame rate of 100 Hz.
• Depending on timely delivery, an in-vacuum 2D detector will be offered as well, with the following characteristics:
  • 512 X 512 pixels
  • 50 um pixel size
  • 5 kHz full frame readout
    This detector will also be mounted on the 2-theta arm

Users are encouraged to contact Apurva Mehta, mehta@slac.stanford.edu and Georgi Dakovski, dakovski@slac.stanford.edu for more information.