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Experimental setup and simplified geometry of the diagnostic port for terahertz radiation (1: cryostat with HEB, 2: bias voltage supply, 3: bias-tee, 4: microwave amplifier, and 5: sampling oscilloscope).
Example of a fill pattern measured with a HEB at terahertz frequencies and with an APD at x-ray energies. The total current in the ring is and the maximum current in a bunch is .
Terahertz signal as a function of the bunch current. The transition from stable to bursting CSR occurs at about /bunch. The solid line is a fit of Eq. (1) while the dashed line is a guide for the eye.
CSR pulse from a single electron bunch with current ( corresponding to a rms bunch length of ).
Spectrum of CSR measured with a HEB and a Fourier transform spectrometer which was placed in front of mirror M3 (see Fig. 1). The inset shows the corresponding interferogram. Note that the maximum mirror displacement corresponds to a pulse length larger than .
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