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Published byLayne Brill Modified over 2 years 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 = 0.275 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 = 0.275 mm (post BC1 bunch length)

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New: (R 56-1 = -55 mm, R 56-2 = -49.6 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 = 0.215 mm (post BC1 bunch length)

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New: (R 56-1 = -55 mm, R 56-2 = -35.2 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 = 0.140 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 = 0.090 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) 0.2750.2150.1400.090 BC1 E /E (rms) 1.41.51.61.8 BC1 R 56 (mm)55 BC2 R 56 (mm)59.049.635.217.0 V 3.9-GHz (MV)55565965 Final x ( m) 1.00.770.690.55 Final y ( m) 0.450.420.390.38 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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