[Seminars] CBB Seminar MONDAY November 25, 2019

[Ramona Echols]

**CBB Seminar Today**

PLEASE NOTE SPECIAL TIME AND LOCATION

CBB Seminar at UChicago
Monday November 25, 2019
Time: 3:00 PM CST   4:00PM EST
Location: MCP 215
ZOOM Info: https://cornell.zoom.us/j/373862927


Speaker:
Ryan Roussel, UCLA/UChicago

Title:
Single Shot High Transformer Ratio Measurements in The Nonlinear Plasma Regime

Abstract:
We demonstrate the first single shot measurement of a multi-period, loaded PWFA wakefield, used to conduct measurements of the transformer ratio (TR), the ratio between the maximum accelerating and decelerating fields in a collinear wakefield accelerator, that far exceed previous measurements. The emittance exchange beamline at the Argonne Wakefield Accelerator was used to create a variable longitudinal drive profile with a long witness to sample multiple wakefield periods. A TR exceeding the limit of 2 for longitudinally asymmetric beams was observed for a linear ramp and wakefield flattening was observed for a beam with a parabolic head. These effects are important for efficient energy transfer from drive to witness beam, and for lengthening the interaction length of the process. Furthermore, by adjusting plasma density parameters, multi-period plasma wakefields were observed transitioning from linear to nonlinear regimes leading to experimental verification of theoretical wakefield properties. Finally, we discuss future Michelson Center for Physics experiments that extend this work using machine learning at AWA.








Warmly,



Ramona Echols,  EFI/HEP Secretary IV

Enrico Fermi Institute

University of Chicago

933 E 56th Street, MCP 101

Chicago, IL 60637

Phone: 773-702-8113

Rechols06 at uchicago.edu


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