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FLASH 2 Beam Dynamics Issues

FLASH 2 Beam Dynamics Issues. Winni Decking DESY –MPY-. FLASH II. FLASH II Proposal. Principal Layout. Operation Modes SASE operation Seeded schemes: HGHG operation HHG operation Hybrid: HHG seed with HGHG stage EEHG under study. Layout. Extraction into FLASH II.

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FLASH 2 Beam Dynamics Issues

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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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