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TUPA39 |
Bunch Length Measurements of High Brightness Electron Beams in the Single-shot Mode | |
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The determination of bunch length in the single-shot mode is critical for many advanced accelerator and light source facilities as ultra-short beams become more ubiquitous. These short beams (sub-ps) typically emit coherent radiation via transition radiation (or synchrotron or edge radiation) in the terahertz (THz) frequency range. The Real-Time interferometer (RTI) is a solid-state, spatial interferometer that incorporates terahertz optics and a novel linear, pyroelectric detector array that generates single-shot interferograms that are directly correlated to the beam bunch length. The device has been tested for coherent sources in the IR, and recently demonstrated at the Fermilab A0 test facility [1]. In this paper, we review the physical concepts, recent results, and potential future applications at both the Brookhaven National Laboratory Accelerator Test Facility and the SLAC National Laboratory FACET facility.
[1] J. Thangaraj, G. Andonian, R. Thurman-Keup, et al., Rev. Sci. Instrum. 83, 043302 (2012). |
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TUPA40 |
High Resolution Bunch Profile Determination with an X-band Deflecting Cavity | |
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| The determination of the longitudinal profile of high-brightness beams on the ~fs scale is important for many present-day applications that employ ultra-short beams. A direct method to measure the beam profile in the temporal domain utilizes a transverse cavity operating in the zero-crossing mode. Here we present the development and commissioning results of an x-band deflecting cavity that is currently installed at the Brookhaven National Laboratory Accelerator Test Facility. Initial studies and simulations show that a temporal resolution of <10fs is achievable. In addition, we propose a method to enhance this resolution to the sub-fs scale with the addition of a laser-modulator (a high-power laser and an undulator) to impose an angular modulation on the beam. This modulation, in tandem with the transverse cavity, is resolvable on a distant screen; simulations show that temporal resolutions on the sub-fs scale are achievable. | ||