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Schematic of the FT-IR spectrometer setup for THz spectral measurement.

Schematic of the FT-IR spectrometer setup for THz spectral measurement.

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Fig.1. Layout of FEL facility and THz beam port. GUN, photo-cathode...
Fig.2. Schematic of the FT-IR spectrometer setup for THz spectral...
Subpicosecond electron bunch length measurement by terahertz radiation
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This paper presents the measurement of sub-picosecond relativistic electron beam bunch length by analyzing the spectra of the coherent terahertz pulses through Kramers-Kronig transformation. The results are compared with autocorrelation from a scanning polarization autocorrelator that measures the coherent optical transition radiation. The limitati...
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... primary instrument used in this experiment is a Nicolet FT-IR spectrometer. Fig.2 shows the optical layout of the experimental setup with a simplified spectrometer schematic. ...

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Beam tuning and bunch length measurement in the bunch compression operation at the cERL
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Realization of a short bunch beam by manipulating the longitudinal phase space distribution with a finite longitudinal dispersion following an off-crest accelera- tion is a widely used technique. The technique was applied in a compact test accelerator of an energy-recovery linac scheme for compressing the bunch length at the return loop. A diagnostic system utilizing coherent transition radiation was developed for the beam tuning and for estimating the bunch length. By scanning the beam parameters, we experimentally found the best condition for the bunch compression. The RMS bunch length of 250+-50 fs was obtained at a bunch charge of 2 pC. This result confirmed the design and the tuning pro- cedure of the bunch compression operation for the future energy-recovery linac (ERL).
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