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Design Considerations for BCM and CRD Systems in XFEL Applications

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This document outlines the design parameters and considerations for Beam Current Monitors (BCM) and Coherent Radiation Detectors (CRD) in the context of an XFEL source. Key points include operational specifics at 17.5 GeV with options for off-axis screens and kicker functionality. The positioning of CRDs relative to collimators, the effects of coherent and incoherent radiation, and the need for dual-function screens are discussed. The design targets include completion deadlines and the functionality of infrared and THz detectors, ensuring adaptability and efficacy in various scenarios.

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Design Considerations for BCM and CRD Systems in XFEL Applications

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  1. Overview BCM / CRD Coherent Diagnostic

  2. Baseline Design • CRD B1 & B2 only work with TR! (fallback if problems with TDS) • Off axis screen • Kicker • Single bunch • CRD @ 17.5GeV with DR • Decide on location before / after collimator • Effects from (C)SR • BCM 5.1 & 5.2 or 5 before distribution

  3. Longitudinal Parameters XFEL Source: simulations I. Zagorodnov, early 2011

  4. What can be Measured? FormFactors!

  5. Typical Station e- screen window IR / THz detector(s) mirror filter(s)

  6. Multichannel @ FLASH S. Wesch

  7. Multichannel @ SITF

  8. Design DR Chamber • Design to be finalized by end of 2013 • Fixed / variable slits • Mover: VAB or MDI or ??

  9. 1. CDR Simulation @ 17.5GeV • Incoherent diffraction radiation • E = 17.5GeV • q = 50pC • 4mm hole in 20mm foil THz Transport, B. Schmidt

  10. Detectors

  11. ALS homepage

  12. Open Questions • Positions of BCMs and CRD(s) • CRD before or after collimator  problems with SR?? • Screens: fixed or variable slits • Speed of detectors • Detectors to cover frequency range after BC2 • Filters for BCMs • Windows for all stations • Single shot capability of spectrometer

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