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Considerations for the LCLS-II UXT Tunnel Length and Self-Seeding Options

This document discusses critical considerations regarding the length of the LCLS-II UXT tunnel and its implications for self-seeding options. Key factors include photon energy tunability and the uncertainties surrounding S-S photon energy flexibility. The discussion highlights the single crystal scheme that is necessary for optimal pulse energy generation, specifically for short and low charge bunches. It also includes details on the stack-up configurations for both CD1 SXR and CD1 HXR beamlines, offering insights into energy requirements and practical limitations.

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Considerations for the LCLS-II UXT Tunnel Length and Self-Seeding Options

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  1. LCLS-II UXTTunnel Length Considerations J. Welch, J. Wu, H-D. Nuhn, Z. Huang, M. Rowen, 10-5-11

  2. CD1 Layout BTH (Research Yard) UXT 304 m EH2

  3. Tunnel Length and Scenarios

  4. Limitations of Self-Seeding Options • Photon energy tunability • Not clear if S-S photon energy is flexible or if a different crystal is needed for different photon energies. • Pulse energy • single crystal scheme requires short, low charge bunches which may not generate much pulse energy. 1 TW x 1 fs = 1 mJ

  5. CD1 SXR Beamline Stack-up

  6. CD1 HXR Beamline Stack-up

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