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The SXR Instrument. The SXR is a instrument for Soft X-ray Materials Research on the LCLS SXR has revised an old concept at the LCLS SXR is compatible with multiple techniques for studying materials with ultra short soft x-rays pulses
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The SXR Instrument The SXR is a instrument for Soft X-ray Materials Research on the LCLS SXR has revised an old concept at the LCLS SXR is compatible with multiple techniques for studying materials with ultra short soft x-rays pulses SXR spans both hutches 1 & 2 with the end station in Hutch 2 Michael Rowen Project Manager
Scientific Drivers for SXR • Pump-Probe Ultrafast Chemistry • Magnetic Imaging • X-Ray Scattering Spectroscopy on Strongly Correlated Materials • Ultrafast Coherent Imaging
Dissociation ~ 1Å / 100 fs. Science Charge, spin and orbital order Solution based ultrafast chemistry Pump-probe Ultrafast Surface Chemistry Magnetic Imaging
Science Driven Requirements • Soft X-ray Beam Line, 500*-2000eV: • Monochromatic, E/DE of ~5000 • Focused or unfocused beam at end station • Switch between monochromatic and “white” beam without moving experimental system • Open end station for interchangeable user systems • Capabilities for fast, single shot, transmission spectroscopy • * Running LCLS will be at photon energies >825eV in the near term.
SXR Beam Line • Monochromator • Exit slit • Focusing Optics • Transmission sample chamber (up stream of mono) • Spectrometer detector (insertable, at exit slit) • No fixed end station • PPS & MPS • Beam Line controls • SXR compliments the AMO experiment
Grating Monochromator • Varied Line Spacing (VLS) grating monochromator: • 2 optical elements (vertical): spherical mirror, VLS plane grating • 1 rotation of grating • Erect focal plane for spectrometer mode and fixed slit position. • B4C coated optics Courtesy Phil Heimann
Monochromator Layout • Grating System & Exit Slit • mono spans 1st and second hutch
Pulse duration preservation • Pulse stretching: N m l = 40 fs at 826 eV: • Dispersive measurements and white beam LCLS pulse duration is unaffected. • An aperture will reduce pulse stretching with a decreased intensity and energy resolution. Courtesy Phil Heimann
Focusing Optics • K-B Optics: • Silicon Substrates • B4C coatings • Profiled mirrors bent to elliptical cylinders • Focus <10x10mm
K-B Refocusing Mirrors • K-B Mirrors Focus to <10x10mm or Unfocused
Use ALS beamline mechanical designs • ALS “standard” monochromator: • 0.1 mrad motion of pre-mirror and grating, • Horizontal translation of chamber. • ALS bendable mirror: • Motorized leaf springs, • Flange mounted. • Plan to use existing mechanical designs with minimal modifications in the LCLS SXR Instrument.
Endstations 8 Endstations described in the TDR document Stöhr Chapman Nilsson Hussein-Shen
Spectrometer Mode • Transmission Sample Location • w/ Pump Laser Spectrometer Detector at Exit Slit
Institutional Roles Total estimated cost:
Status of MoU • The MoU between SLAC and DESY has been signed by DESY and approved at SLAC. Awaiting Directors signature. • The addendum defining contributions and roles of the members of the consortium is in final draft and should be completed by Monday October 20th.
SXR Status • The SXR scientific case has been reviewed by SAC. • Technical Design Report (TDR) has been written and accepted. • LCLS has reviewed the project for compatibility. • The X-ray optical design has been reviewed. • The MoU is close to being signed. • Integration of SXR into the LCLS construction project has started. • Long lead optical components are out to bid
SXR ScheduleSXR has not been integrated into the LCLS schedule. These completion dates are the earliest possible dates and independent of the LCLS running schedule. Expected final installations are in December ’09.
Operations • LCLS has put a stringent constraint on operations of the SXR experiment. • There must be access to Hutch 1, AMO, when there is beam in the SXR line. • Though on day one of SXR operations there will not be access to Hutch 1, SXR is working with Radiation Physics on defining and building in the necessary shielding and controls for access soon after SXR operations start. • Operations with samples in the transmission chamber for spectrograph mode will take longer to be approved.
