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Optimization of Beam Dynamics and Layout Challenges for FLASH II at DESY

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This proposal outlines the fundamental issues and proposed solutions regarding beam dynamics in the FLASH II facility at DESY. Key areas include simultaneous operation of FLASH and FLASH II, extraction layout, and SASE operation modes. The challenges presented are space constraints, CSR-induced emittance growth, and the need for maintaining beam quality. Solutions focus on optimizing bending sections and minimizing dispersion. Open questions regarding septum design and collimation strategies are also discussed, aiming for improved performance in future FLASH facilities.

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Optimization of Beam Dynamics and Layout Challenges for FLASH II at DESY

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  1. FLASH 2 Beam Dynamics Issues Winni Decking DESY –MPY-

  2. FLASH II Winni Decking

  3. FLASH II Proposal Winni Decking

  4. Principal Layout Operation Modes SASE operation Seeded schemes: HGHG operation HHG operation Hybrid: HHG seed with HGHG stage EEHG under study Winni Decking

  5. Layout Winni Decking

  6. Extraction into FLASH II • Preserve beam quality • Simultaneous operation of FLASH & FLASH II • Kicker – Septum extraction • No optics changes • R56 = 0 to have similar compression behavior • Arc should allow for energy collimation • Space for laser beam ‘injection’ • Foresee space for additional beamline (FLASH III) Challenges: • Very limited space between ACC7, extraction and collimation • CSR induced projected emittance growth, especially important for cascaded HGHG and HHG schemes • See also BD meeting 2009.01.26 and others Winni Decking

  7. 1st Layout of Extraction Arc okay for SASE but to large projected emittance growth (factor 4-8) Winni Decking

  8. Principal Solutions • Keep bends shorter than overtaking length and try to minimize dispersion downstream • Avoid high betas where CSR transients still cause energy loss • Try cancellation effects with appropriate phase advance between bending sections • Optimization tends to minimum emittance cell solutions Winni Decking

  9. Principal Solutions - Example Triple bend achromat with total of 10 deg bending Winni Decking

  10. Open Questions • Septum: Lambertson or Current-Sheet ? • FLASH Bypass or commissioning dump ? • Maintain FLASH collimation or move Winni Decking

  11. First Collection of Requirements (tbc) Winni Decking

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