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Nominal and no CSR ( R 56-1 = 55 mm, R 56-2 = 59 mm, R 56-3 = 0)

Elegant Tracking. s z 1 = 0.275 mm (post BC1 bunch length). CSR OFF BC3 OFF. Nominal and no CSR ( R 56-1 = 55 mm, R 56-2 = 59 mm, R 56-3 = 0) L1 phase = 21 deg , V 3.9 = 55 MV. s z 1 = 0.275 mm (post BC1 bunch length). ge x  1.0 m m. CSR ON BC3 OFF. ge x  0.45 m m.

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Nominal and no CSR ( R 56-1 = 55 mm, R 56-2 = 59 mm, R 56-3 = 0)

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  1. Elegant Tracking sz1= 0.275 mm (post BC1 bunch length) CSR OFF BC3 OFF Nominal and no CSR (R56-1 = 55 mm, R56-2 = 59 mm, R56-3 = 0) L1 phase = 21 deg, V3.9 = 55 MV

  2. sz1= 0.275 mm (post BC1 bunch length) gex 1.0 mm CSR ON BC3 OFF gex 0.45 mm Nominal: (R56-1 = -55 mm, R56-2 = -59 mm, R56-3 = 0) L1 phase = -21 deg, V3.9 = 55 MV

  3. sz1= 0.215 mm (post BC1 bunch length) gex 0.77 mm CSR ON BC3 OFF gex 0.42 mm New: (R56-1 = -55 mm, R56-2 = -49.6 mm, R56-3 = 0) L1 phase = -23 deg, V3.9 = 56 MV

  4. sz1= 0.140 mm (post BC1 bunch length) CSR ON BC3 OFF gex 0.69 mm gex 0.39 mm New: (R56-1 = -55 mm, R56-2 = -35.2 mm, R56-3 = 0) L1 phase = -25 deg, V3.9 = 59 MV

  5. sz1= 0.090 mm (post BC1 bunch length) CSR ON BC3 OFF gex 0.55 mm gex 0.38 mm New: (R56-1 = -55 mm, R56-2 = -17 mm, R56-3 = 0) L1 phase = -26 deg, V3.9 = 65 MV

  6. CSR Emittance Growth vs L1 RF phase (i.e., BC1 compression) BC3 OFF

  7. Compression Parameters Over L1 RF Phase Scan (~1-kA constant peak current)

  8. Current Profile is Spiked and Sloped – How to Fix It? No CSR ?

  9. Use Harmonic Voltage to Slope the Current Profile (2nd order chirp) L1 phase and voltage adjusted also

  10. Use Harmonic Phase to flatten the Current Profile (3rd order chirp) L1 phase and voltage, as well as 3.9-GHz voltage all adjusted also

  11. Suggested New 100-pC Configuration New No DeChirper No CSR Old 8-m DeChirper

  12. New 100-pC Configuration (12 A  1 kA)? * 15/16 cavities powered with 98-MeV injector

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