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European XFEL Seminar

The TMO Instrument: Opportunities and Plans for Time-resolved Atomic, Molecular and Optical Science at LCLS-II

by Dr Peter Walter (SLAC National Accelerator Laboratory)

XHQ (E1.173) (European XFEL)

XHQ (E1.173)

European XFEL

Campus Schenefeld

Synopsis The new designed Time-resolved Atomic, Molecular and Optical Science end station, will be configured to take full advantage of both the high per pulse energy from the copper accelerator (120 Hz) as well as high average intensity and high repetition rate (1 MHz) from the superconducting accelerator. TMO will support many experimental techniques not currently available at LCLS and will have two X-ray beam focus spots. Thereby, TMO will support AMO science, strong-field and nonlinear science and a new dynamic reaction microscope.



The unique capabilities of LCLS, the world’s first hard X-ray FEL, have had significant impact on advancing our understanding across a broad range of scientific fields, from fundamental atomic and molecular physics, to condensed matter, to catalysis and structural biology. A major upgrade of the LCLS facility, the LCLSII project, is now underway. LCLS-II is being developed as a high-repetition rate X-ray laser with two simultaneously operating, independently tunable FELs. It features a 4 GeV continuous wave superconducting linac that is capable of producing uniformly spaced (or programmable) ultrafast X-ray laser pulses at a repetition rate up to 1 MHz spanning the energy range from 0.25 to 5 keV. Furthermore, the XLEAP sub-femtosecond soft X-ray pulse generation program is scalable to LCLS-II repetition rate[1].
The Time-resolved atomic, Molecular and Optical Science (TMO) instrument, one of the three new LCLS-II instruments with a energy range from 0.25 to 2 keV, will support AMO science, strong-field and nonlinear science, and a new dynamic reaction microscope. TMO will support many experimental techniques not currently available at LCLS and will have two X-ray focus spots. At the first focus spot of the TMO instrument we will offer the possibility to install standardized modular stations (roll in and out) which can be set up, aligned and commissioned out

side the hutch and then get installed for operations. These highly standardized stations will be optimized for performing high energy, high resolution, time- but also angular-resolved photoelectron spectroscopic measurements by using high resolution iTOF and eTOF, double-sidedVMI [2] or coaxial-VMI [3], and the future MRCOFFEE endstation. At the second focus spot a new reaction microscope endstation will house a COLTRIMS type spectrometer to accommodate extreme vacuum, sub-micron focus spot size, and target purity requirements as dictated by coincidence experiments. The accumulation of data will be performed on an event-by-event basis using the 1 MHz full repetition rate of LCLS-II. We would like to present some of the important science opportunities, new capabilities and instrumentation being planned for NEH 1.1 (TMO) at LCSL-II.




[1] Marinelli, A., et. al., (2017). High Power SubFemtosecond X-Ray Pulse Study for the LCLS. Proceedings of IPAC 2017, Copenhagen, Denmark (WEPAB118), 2848–2850. [2] Osipov, et. l., (2018). The LAMP instrument at the Linac Coherent Light Source free-electron laser. Review of Scientific Instruments, 89(3), 035112. [3] Cryan, J., et. al., (2018). A co-axial velocity map imaging spectrometer for electrons. AIP Advances, 8(11), 115308.