Understanding Monopole Wake Effects in Accelerator Studies
Explore planned Wakefield studies for December 2015 focusing on the production, effects, and proposed structures related to transverse monopole wakes in accelerator research. Learn about the potential impacts and experimental strategies to address these wake effects.
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Presentation Transcript
Planned Wakefield Studies for December 2015 CesrTA Run Jeremy Perrin
Production of Transverse Monopole Wakes Vertical wake that acts on beam centroid depends on longitudinal position only. Caused by reflection asymmetry of vacuum chamber or beam centroid offset in dipole wake Measured in April 2015: Centroid bump through undulator chamber Planned December 2015: Asymmetric scraper These are extreme cases, but other sources may be relevant (e.g. pump slots). Simulations are in the works.
Effects Caused by Monopole Wakes: Existing Experimental Results
Effects Caused by Monopole Wakes: Vertical Crabbing (simulation)
Effects Caused by Monopole Wakes: Vertical Crabbing (simulation)
Effects Caused by Monopole Wakes: Vertical Crabbing (simulation)
Effects Caused by Monopole Wakes: Synchrobetatron Resonances (simulation)
Proposed Experimental Structure Vary vertical phase advance between wake source (scraper, 43W) and XBSM. Check dependence on tune, current, and scraper position. Scan vertical tune to look for resonances. Check dependence on scraper position.
Summary Vertical monopole wakes can cause apparent and actual increases in vertical beam size. For a simple case (strong localized wake from asymmetric scraper) we hope to experimentally distinguish crabbing growth from other effects.
