Observation of Enhanced Transformer Ratio in Collinear Wakefield Acceleration
- Euclid Techlabs LLC, Solon, Ohio 44139 (United States)
- High Energy Physics Division, Argonne National Laboratory, Argonne, Illinois-60439 (United States)
One approach to future high energy particle accelerators is based on the wakefield principle: a leading high-charge drive bunch is used to excite fields in an accelerating structure or plasma that in turn accelerates a trailing low-charge witness bunch. The transformer ratio R is defined as the ratio of the maximum energy gain of the witness bunch to the maximum energy loss of the drive bunch. In general, R<2 for this configuration. A number of techniques have been proposed to overcome the transformer ratio limitation. We report here the first experimental study of the ramped bunch train (RBT) technique in a dielectric based accelerating structure. A single drive bunch was replaced by two bunches with charge ratio of 1 ratio 2.5 and a separation of 10.5 wavelengths of the fundamental mode. An average measured transformer ratio enhancement by a factor of 1.31 over the single drive bunch case was obtained.
- OSTI ID:
- 20951211
- Journal Information:
- Physical Review Letters, Vol. 98, Issue 14; Other Information: DOI: 10.1103/PhysRevLett.98.144801; (c) 2007 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 0031-9007
- Country of Publication:
- United States
- Language:
- English
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Observation of Enhanced Transformer Ratio in Collinear Wakefield Acceleration
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