The 3-km SLAC linac, divided into FACET and LCLS linacs. THz sources are in the FACET experimental area and in the LCLS undulator hall.
The THz and IP tables of FACET.
Layout of the FACET THz table.
FACET THz table and dry-air enclosure.
Calculated (a) CTR electric field, (b) electron-bunch peak current, and (c) CTR power spectrum, using the parameters discussed in the text.
Calculations comparing the spectrum of the ribbon beam of standard optics (dashed line) to the double waist (solid) and to an 85-μm circular beam (dotted).
(a) Michelson interferogram of a CTR THz pulse from a highly compressed electron bunch. The points are normalized to the reference detector. (b) Normalized power spectra of THz pulses from bunches with low and high compression.
(a) Central region of the autocorrelation of Figure 7(a) , after subtracting the mean, with a fit about the peak to find the high-pass filter. (b) The high-compression spectrum (dashed line) of Figure 7(b) is compensated (solid) for the high-pass filter, down to the leftmost circled point, below which a Gaussian fit to all the circled points extends the curve to f = 0.
Reconstruction of bunches at (a) high, (b) medium, and (c) low compression. A typical “double horn” structure develops as the compression is reduced.
Reconstruction of the focused THz electric field in FACET.
A comparison of the THz profile reconstruction of Figure 9(c) with a measurement using a transverse deflecting cavity.
The FACET electron beam on the upstream THz foil, imaged with the same scale using optical transition radiation, for (a) standard and (b) double-waist electron optics.
Electron-beam energy loss due to inserting the 2-μm Be foil.
Dependence of THz energy on charge and FWHM bunch duration, measured by (a) a pyroelectric joulemeter at a THz focus, and (b) the electron-beam energy loss.
Reconstruction of the focused THz field in LCLS.
A nonlinear autocorrelation measured with a silicon photodiode.
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