Intense terahertz pulses from SPARC_LAB coherent radiation source

The linac-based Terahertz source at the SPARC_LAB test facility is able to generate highly intense Terahertz broadband pulses via coherent transition radiation (CTR) from high brightness electron beams. The THz pulse duration is typically down to 100 fs RMS and can be tuned through the electron bunch duration and shaping. The measured stored energy in a single THz pulse has reached 40 μJ, which corresponds to a peak electric field of 1.6 MV/cm at the THz focus. Here we present the main features, in particular spatial and spectral distributions and energy characterizations of the SPARC_LAB THz source, which is very competitive for investigations in Condensed Matter, as well as a valid tool for electron beam longitudinal diagnostics.

[1]  E. M. Lifshitz,et al.  Electrodynamics of continuous media , 1961 .

[2]  Sultan B. Dabagov,et al.  SPARC_LAB present and future , 2013 .

[3]  A Mostacci,et al.  Characterization of the THz radiation source at the Frascati linear accelerator. , 2013, The Review of scientific instruments.

[4]  Barbara Marchetti,et al.  The SPARC linear accelerator based terahertz source , 2013 .

[5]  Christoph P. Hauri,et al.  GV/m Single-Cycle Terahertz Fields from a Laser-Driven Large-Size Partitioned Organic Crystal , 2014 .

[6]  A Mostacci,et al.  Experimental demonstration of emittance compensation with velocity bunching. , 2010, Physical review letters.

[7]  Lai,et al.  Measurement of the longitudinal asymmetry of a charged particle bunch from the coherent synchrotron or transition radiation spectrum. , 1994, Physical review. E, Statistical physics, plasmas, fluids, and related interdisciplinary topics.

[8]  K. Nelson,et al.  Generation of 10 μJ ultrashort terahertz pulses by optical rectification , 2007 .

[9]  Alessandro Cianchi,et al.  EFFECTS OF DIFFRACTION AND TARGET FINITE SIZE ON COHERENT TRANSITION RADIATION SPECTRA IN BUNCH LENGTH MEASUREMENTS , 1999 .

[10]  Yun-Shik Lee,et al.  Principles of Terahertz Science and Technology , 2008 .

[11]  Henrik Loos,et al.  Intense terahertz pulses from SLAC electron beams using coherent transition radiation. , 2013, The Review of scientific instruments.

[12]  Massimo Ferrario,et al.  Velocity Bunching in Photo-Injectors , 2001 .