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G. Codner, E. Tanke, M. Palmer Cornell University

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Presentation on theme: "G. Codner, E. Tanke, M. Palmer Cornell University"— Presentation transcript:

1 Recent CESR-c Electron Cloud Measurements Using Bunch-by-Bunch Tune and Beamsize Monitors
G. Codner, E. Tanke, M. Palmer Cornell University Laboratory for Elementary-Particle Physics R. Holtzapple, J. Kern, B. Cerio Alfred University

2 CESR-c Vertical Beamsize for 1x45 Pattern
0.25 mA 0.35 mA 1 mA 0.5 mA 0.75 mA April 8, 2019 CESR-c Electron Cloud Measurements

3 Beamsize and Tunes vs Bunch
V Tune Size H Tune ? e+ 1x45 pattern sv constant at I=0.25mA/bunch. sv bunch: 35 for I=0.35mA/bunch. 18 for I=0.5mA/bunch. 10 for I=0.75mA/bunch. 8 for I=1mA/bunch. 3. Vertical tune shift grows with current. April 8, 2019 CESR-c Electron Cloud Measurements

4 Global Tune Monitoring
I=0.35mA/bunch I=1mA/bunch April 8, 2019 CESR-c Electron Cloud Measurements

5 CESR-c Electron Cloud Measurements
Electrons V Tune V Size H Tune ? April 8, 2019 CESR-c Electron Cloud Measurements

6 CESR-c Electron Cloud Measurements
April vs Now April Now April 8, 2019 CESR-c Electron Cloud Measurements

7 Alternate Operating Point for e-
V Size V Tune Change Tunes Towards CesrTF Working Point H Tune April 8, 2019 CESR-c Electron Cloud Measurements

8 Turn-by-Turn Measurements
Want to make full use of turn-by-turn measurements Have been experiencing problems with turn-by-turn positron Timing signal degradation causing sampling jitter Average measurements (100 turn) ok although degraded S/N Not able to distinguish beam size growth versus centroid motion on shorter timescales Have April 8, 2019 CESR-c Electron Cloud Measurements

9 CESR-c Electron Cloud Measurements
Hardware Changes Electron beam profile monitor Presently does NOT have a shutter Hence operates at lower gain in a multi-bunch scenario to avoid destroying the PMT array Will install shutter system tomorrow Positron beam profile monitor Presently has optical magnification of ~15x OK for “steady-state” studies Too much for dynamical studies Will reduce magnification by ~2x tomorrow April 8, 2019 CESR-c Electron Cloud Measurements

10 CESR-c Electron Cloud Measurements
Further Studies April 8, 2019 CESR-c Electron Cloud Measurements

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