Preliminary Analysis of April 24, 2006 CESR Bunch Measurements

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Presentation transcript:

Preliminary Analysis of April 24, 2006 CESR Bunch Measurements M. Billing, G. Codner, R. Holtzapple, M. Palmer, D. Rice, E. Tanke, M. Watkins

CESR Machine Studies Meeting Measurement Overview April 24, 2006 BSM 23E (e+) setup 2 GeV e- e+ Cloud Studies 1x45 positrons vs bunch current Bunch tunes (BPM 6W1) Bunch sizes (BSM 23W) 1x45 electrons vs bunch current Bunch sizes (BSM 23E) 5 GeV e- Cloud Studies CHESS positron pattern (on-axis) CHESS electron pattern (on-axis) May 19, 2006 CESR Machine Studies Meeting

2.08 GeV 0.5 mA e+ Stable Beam ~1 kHz tune variation from start to end of train Minimal variation size Vertical Units: PMT Channel = mm May 19, 2006 CESR Machine Studies Meeting

CESR Machine Studies Meeting 2.08 GeV e+ 0.75 mA ~1.5 kHz Spread Unstable Current Why is width stable longer? 1.0 mA ~2-3 kHz Spread May 19, 2006 CESR Machine Studies Meeting

CESR Machine Studies Meeting 2.08 GeV e- Tunes 1.5 mA Unstable 0.5 mA Unstable 1.0 mA Unstable May 19, 2006 CESR Machine Studies Meeting

CESR Machine Studies Meeting 2.08 GeV e- Beamsize 1.5 mA Unstable 0.5 mA Unstable 1.0 mA Unstable Appears that we didn’t have stable conditions from the outset Not a valid electron cloud measurement Will need to repeat more carefully Set conditions at max bunch current and then make measurements vs current without changing machine setup May 19, 2006 CESR Machine Studies Meeting

CESR Machine Studies Meeting 5 GeV e+ 1x45 Tunes 0.5 mA ~0.5 kHz Spread 1.0 mA ~1.25 kHz Spread 0.75 mA ~0.75 kHz Spread 1.25 mA ~1.5 kHz Spread May 19, 2006 CESR Machine Studies Meeting

CESR Machine Studies Meeting 5 GeV e+ 1x45 Beamsize Onset of instability Need to take some turn-by-turn data to understand fully (separate centroid motion from width) 0.5 mA ~0.5 kHz Spread 1.0 mA ~1.25 kHz Spread 0.75 mA ~0.75 kHz Spread 1.25 mA ~1.5 kHz Spread May 19, 2006 CESR Machine Studies Meeting

CESR Machine Studies Meeting Septum Analysis In Progress … May 19, 2006 CESR Machine Studies Meeting