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X-ray energies ranging from 280 to 2000 eV will be available. Soft X-ray self-seeding, two-color FEL, and two-pulse operations will be offered as part of the standard configuration.
AMO’s KB focusing system can provide focus down to 2 micron (FWHM) and is adjustable in size up to several 100s of microns FWHM.
Time-resolved experiments employing tunable femtosecond pulses will be supported under this standard configuration. The fundamental and harmonics (800, 400 and 267 nm) from the AMO, ~50 fs Ti:Sapphire laser will be available, delivered to the target collinearly with the x-rays, with in-coupling ~35 cm upstream of the interaction, and with the focusing lens ~1000-1500 mm away from the same. The achievable maximum peak intensity/fluence will be determined by the existing optical system and will not be modified. Contact the AMO scientists to discuss specific needs and to confirm whether they can be achieved in this standard configuration of the laser.
The AMO transmission sample system time-tool will be available to record single shot arrival times (t<100 fs) that can be post-sorted. A jitter-corrected plot can be shown online during the experiment provided the x-ray is not too attenuated. Coarse temporal overlap (t<20 ps) can be obtained via photoelectric effect monitoring on an SMA wire at the interaction (on the focus paddle). Finer time zero determination at the focus is typically optimized using ion time of flight.
The standard gas delivery setup will be a single or double skimmer stage with differential pumping. A pulsed Even-Lavie valve will be offered as part of the standard configuration. For detailed information, please contact AMO scientists.
A high-resolution double-sided velocity map imaging (VMI) spectrometer, designed for the LAMP chamber will be supported. This spectrometer has a longer side, which is typically biased to measure ions, and a shorter side for electrons. The spectrometer is capable of measuring a full 4pi solid angle of fragments. With the typically used voltages the ion side detects kinetic energies up to 50 eV with time-of-flight resolution of 100ps. The electron side has energy resolution of up to 75, and collects 4pi of up to 150 eV energy electrons. If only one side of the spectrometer needs to be operational at a time, higher energy particles can be captured. As an alternative, flat field arrangement can also be achieved.
The detector in the ion-side is a Roentdek delay-line detector, DLD120. A Z stack MCP measures time of flight while the 120mm square delay-line anode enables the position detection. The electron side detector consists of an MCP-phosphor screen assembly. The phosphor screen is of highest imaging quality P47 grade, which emits blue light with ~100 ns decay constant, that allows for fast hit processing.
SLAC National Accelerator Laboratory, Menlo Park, CA
Operated by Stanford University for the U.S. Dept. of Energy