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Published byLayne Brill Modified about 1 year ago

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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 CSR OFF BC3 OFF Elegant Tracking z1 = mm (post BC1 bunch length)

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Nominal: (R 56-1 = -55 mm, R 56-2 = -59 mm, R 56-3 = 0) L1 phase = -21 deg, V 3.9 = 55 MV x 1.0 m x 0.45 m CSR ON BC3 OFF z1 = mm (post BC1 bunch length)

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New: (R 56-1 = -55 mm, R 56-2 = mm, R 56-3 = 0) L1 phase = -23 deg, V 3.9 = 56 MV x 0.77 m x 0.42 m CSR ON BC3 OFF z1 = mm (post BC1 bunch length)

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New: (R 56-1 = -55 mm, R 56-2 = mm, R 56-3 = 0) L1 phase = -25 deg, V 3.9 = 59 MV x 0.69 m x 0.39 m CSR ON BC3 OFF z1 = mm (post BC1 bunch length)

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New: (R 56-1 = -55 mm, R 56-2 = -17 mm, R 56-3 = 0) L1 phase = -26 deg, V 3.9 = 65 MV x 0.55 m x 0.38 m CSR ON BC3 OFF z1 = mm (post BC1 bunch length)

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

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Parameter L1 L1 L1 L1 Post BC1 z (mm) BC1 E /E (rms) BC1 R 56 (mm)55 BC2 R 56 (mm) V 3.9-GHz (MV) Final x ( m) Final y ( m) Compression Parameters Over L1 RF Phase Scan (~1-kA constant peak current)

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

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

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

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

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

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