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Physics Requirements for LCLS Endstations

Learn about the physics considerations for specifying the LCLS Endstations in areas like beam transport, undulator systems, and x-ray beam manipulation. This talk covers the crucial infrastructures and experimental setups needed for successful x-ray experiments.

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Physics Requirements for LCLS Endstations

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  1. Physics Requirements for LCLS Endstations J.B. Hastings

  2. From the LCLS Global Requirements document: • The Project scope includes •  facilities for production and transport of a bright, high-current electron beam •  an undulator system in which the electron beam will generate the x-ray beam •  facilities for transport, diagnostics and optical manipulation of the x-ray beam •  endstations and related facilities for x-ray experiments •  conventional facilities for the accelerator systems and x-ray experiments •  a central lab office building to house support staff and researchers This talk will elaborate on the physics basis for the specification of the LCLS Endstations

  3. Where the Endstation systems are located Near Expt Hall Far Expt Hall 250 m

  4. Endstation System Overview • Provides infrastructure for the LCLS experimental program • Hutch systems • Network and controls • Synchronized Pump Lasers • Prototype 2-d detector • Initial AMO experiment

  5. Hutch systems • PPS-Radiation safety for 6 hutches (3 NEH 3 FEH) • Independent access at all times is desireable • MPS for single pulse damage threshold • Provide beam containment system as needed • ALL systems must be approved by the appropriate SLAC safety committees

  6. Network and Controls • Expected data rates of 50-100 MB/sec • Storage, data transfer and computation capabilities for this data rate. • Offsite secure access is required • 20 workstations per experiment can be expected (based on SPPS experience)

  7. Beamline Controls • Typically 100 independent motions • Laser optics • Sample manipulation • Angular variables for typical scattering experiments • Automated sample exchange • EPICS based system is preferred because interface between experiments and FELis CRITICAL

  8. Pump Lasers • Pump-probe experiments will require • Synchronised lasers • 30 fs pulse length • 800 nm nominal wavelength • 1 khz repetition rate • 1 mJ pulse energy • Timing jitter diagnostics

  9. Prototype 2-d Detector • The LCLS provides enough photons per pulse to produce complete diffraction patterns • This requires detectors capable of • 120 hz read out • Good DQE > 50% at 8 keV • Dynamic range 103 • 1 photon sensitivity • Pixel size 100-200 microns, smaller may be desirable • Area > 500 x 500 pixels

  10. Initial AMO Experiment • AMO Advisory committee • Lous F. DiMauro (BNL-Chair) Philip Bucksbaum (Univ. Michigan) Todd Ditmire (Univ. Texas-Austin) Gerhard Paulus (Texas A&M) Linda Young (ANL) • Proposed tier I and tier II experiments • Tier I should be part of LCLS baseline

  11. Initial AMO Experiments Tier I • What everyone one wants to know: LCLS is in a new regime in light-matter interactions • Atomic absorption: Inner shell processes • Probe complex electron behavior: Reaction Microscope • X-ray driven explosions of atomic clusters

  12. Summary • Endstation systems will provide • Complete infrastructure for the LCLS experimental program • Synchronized lasers for laser pump-x-ray probe experiments • A prototype 2-d detector for scattering experiments: pump-probe • Initial AMO experiments

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