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Intense terahertz pulses from SLAC electron beams using coherent transition radiation
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Image of FIG. 1.
FIG. 1.

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.

Image of FIG. 2.
FIG. 2.

The THz and IP tables of FACET.

Image of FIG. 3.
FIG. 3.

Layout of the FACET THz table.

Image of FIG. 4.
FIG. 4.

FACET THz table and dry-air enclosure.

Image of FIG. 5.
FIG. 5.

Calculated (a) CTR electric field, (b) electron-bunch peak current, and (c) CTR power spectrum, using the parameters discussed in the text.

Image of FIG. 6.
FIG. 6.

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).

Image of FIG. 7.
FIG. 7.

(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.

Image of FIG. 8.
FIG. 8.

(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.

Image of FIG. 9.
FIG. 9.

Reconstruction of bunches at (a) high, (b) medium, and (c) low compression. A typical “double horn” structure develops as the compression is reduced.

Image of FIG. 10.
FIG. 10.

Reconstruction of the focused THz electric field in FACET.

Image of FIG. 11.
FIG. 11.

A comparison of the THz profile reconstruction of Figure 9(c) with a measurement using a transverse deflecting cavity.

Image of FIG. 12.
FIG. 12.

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.

Image of FIG. 13.
FIG. 13.

Electron-beam energy loss due to inserting the 2-μm Be foil.

Image of FIG. 14.
FIG. 14.

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.

Image of FIG. 15.
FIG. 15.

Reconstruction of the focused THz field in LCLS.

Image of FIG. 16.
FIG. 16.

A nonlinear autocorrelation measured with a silicon photodiode.


Generic image for table
Table I.

FACET parameters.

Generic image for table
Table II.

LCLS parameters.


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Intense terahertz pulses from SLAC electron beams using coherent transition radiation