Characterization of the THz radiation source at the Frascati linear accelerator.

The linac driven coherent THz radiation source at the SPARC-LAB test facility is able to deliver broadband THz pulses with femtosecond shaping. In addition, high peak power, narrow spectral bandwidth THz radiation can be also generated, taking advantage of advanced electron beam manipulation techniques, able to generate an adjustable train of electron bunches with a sub-picosecond length and with sub-picosecond spacing. The paper reports on the manipulation, characterization, and transport of the electron beam in the bending line transporting the beam down to the THz station, where different coherent transition radiation spectra have been measured and studied with the aim to optimize the THz radiation performances.

[1]  Shibata,et al.  Diagnostics of an electron beam of a linear accelerator using coherent transition radiation. , 1994, Physical review. E, Statistical physics, plasmas, fluids, and related interdisciplinary topics.

[2]  B. Marchetti,et al.  The THz Radiation Source at the SPARC Facility , 2012 .

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

[4]  A Mostacci,et al.  Direct measurement of the double emittance minimum in the beam dynamics of the sparc high-brightness photoinjector. , 2007, Physical review letters.

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

[6]  Gil Travish,et al.  Sextupole correction of the longitudinal transport of relativistic beams in dispersionless translating sections , 2005 .

[7]  E. Palange,et al.  Scaling the spectral response of metamaterial dipolar filters in the terahertz , 2011 .

[8]  Daniele Filippetto,et al.  Chromatic effects in quadrupole scan emittance measurements , 2012 .

[9]  A. Cavalleri,et al.  Coherent single-cycle pulses with MV/cm field strengths from a relativistic transition radiation light source. , 2011, Optics letters.

[10]  Barbara Marchetti,et al.  The THz radiation source at SPARC , 2012 .

[11]  David S. Saxon,et al.  Suppression of Coherent Radiation by Electrons in a Synchrotron , 1954 .

[12]  S. Casalbuoni,et al.  Ultrabroadband terahertz source and beamline based on coherent transition radiation , 2009 .

[13]  Lai,et al.  Determination of a charged-particle-bunch shape from the coherent far infrared spectrum. , 1994, Physical review. E, Statistical physics, plasmas, fluids, and related interdisciplinary topics.

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

[15]  M. Strikhanov,et al.  Diffraction Radiation from Relativistic Particles , 2010 .

[16]  C. Vicario,et al.  The SPARC/X SASE-FEL Projects , 2004 .

[17]  Hang Yang,et al.  Tunable few-cycle coherent terahertz radiation with watt-level power from relativistic femtosecond electron beam , 2012 .

[18]  C. Geddes,et al.  Temporal characterization of femtosecond laser-plasma-accelerated electron bunches using terahertz radiation. , 2005, Physical review letters.

[19]  T. Watanabe,et al.  Nonlinear cross-phase modulation with intense single-cycle terahertz pulses. , 2007, Physical review letters.

[20]  A Mostacci,et al.  High-gain harmonic-generation free-electron laser seeded by harmonics generated in gas. , 2011, Physical review letters.

[21]  C. Vicario,et al.  Phase space analysis of velocity bunched beams , 2011 .

[22]  M. Ferrario,et al.  GENERATION OF SHORT THZ BUNCH TRAINS IN A RF PHOTOINJECTOR , 2007 .

[23]  Fabio Frassetto,et al.  Self-amplified spontaneous emission free-electron laser with an energy-chirped electron beam and undulator tapering. , 2011 .

[24]  Mauro Migliorati,et al.  Laser-driven electron beamlines generated by coupling laser-plasma sources with conventional transport systems , 2012 .

[25]  M. Kiskinova,et al.  Performance of SISSI, the infrared beamline of the ELETTRA storage ring , 2007 .

[26]  H. Hübers,et al.  Steady-state far-infrared coherent synchrotron radiation detected at BESSY II. , 2002, Physical review letters.

[27]  H. Loos,et al.  Terahertz laser modulation of electron beams , 2009 .

[28]  R. Fox,et al.  Classical Electrodynamics, 3rd ed. , 1999 .

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

[30]  Robert Rossmanith,et al.  Far Infrared Coherent Synchrotron Edge Radiation at ANKA , 2006 .

[31]  G. Carr,et al.  Tunable few-cycle and multicycle coherent terahertz radiation from relativistic electrons. , 2011, Physical review letters.

[32]  Gil Travish,et al.  Velocity bunching of high-brightness electron beams , 2005 .

[33]  Barbara Marchetti,et al.  Self-amplified spontaneous emission for a single pass free-electron laser , 2011 .

[34]  F. Wooten.  Chapter 3 – ABSORPTION AND DISPERSION , 1972 .

[35]  D. H. Martin,et al.  Polarised interferometric spectrometry for the millimetre and submillimetre spectrum , 1970 .

[36]  Qing Hu,et al.  DOE-NSF-NIH Workshop on Opportunities in THz Science, February 12-14, 2004 , 2004 .

[37]  F. Wooten,et al.  Optical Properties of Solids , 1972 .

[38]  A. Sievers,et al.  ON USING THE COHERENT FAR IR RADIATION PRODUCED BY A CHARGED-PARTICLE BUNCH TO DETERMINE ITS SHAPE : I ANALYSIS , 1997 .

[39]  J. Ruan,et al.  Observation of coherently enhanced tunable narrow-band terahertz transition radiation from a relativistic sub-picosecond electron bunch train , 2011, 1104.3703.

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

[41]  A. Fisher,et al.  Single-cycle terahertz pulses with >0.2 V/Å field amplitudes via coherent transition radiation , 2011 .

[42]  F. Flora,et al.  The SPARC project: a High brightness electron beam source at LNF to drive a SASE-FEL experiment , 2003 .

[43]  A Mostacci,et al.  High-order-harmonic generation and superradiance in a seeded free-electron laser. , 2012, Physical review letters.

[44]  Barbara Marchetti,et al.  Laser comb with velocity bunching: Preliminary results at SPARC , 2011 .

[45]  C. Geddes,et al.  Single-shot spatiotemporal measurements of high-field terahertz pulses. , 2006, Optics letters.

[46]  A. Potylitsyn.  Transition radiation and diffraction radiation. Similarities and differences , 1998 .

[47]  Bruce E. Carlsten,et al.  New photoelectric injector design for the Los Alamos National Laboratory XUV FEL accelerator , 1989 .