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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.

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Presentation on theme: "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."— Presentation transcript:

1 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)

2 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)

3 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)

4 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)

5 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)

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

7 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)

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

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

10 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

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

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


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