Unveiling relativistic electron bunch microstructures and their dynamical evolutions, using photonic time-stretch

The photonic time-stretch technique allows electric field pulse shapes to be recorded with picosecond resolution, at megahertz acquisition rates. Using this strategy, we could directly record spatial patterns that spontaneously appear in relativistic electron bunches, and follow their dynamical evolution over time. We present recent results obtained using two strategies. At SOLEIL, we present the shapes of the THz pulses which are emitted by the structures, and detected far from the emission point, at the end of a beamline. At ANKA, we present how it has been possible to monitor directly the electron bunch near-field. These new types of single-shot recordings allow direct and stringent tests to be performed on electron bunch dynamical models in synchrotron radiation facilities.

[1]  I.P.S.Martin,et al.  MODELLING THE STEADY STATE CSR EMISSION IN LOW ALPHA MODE AT THE DIAMOND STORAGE RING , 2012 .

[2]  S. Marsching,et al.  Spectral and temporal observations of CSR at ANKA , 2012 .

[3]  Serge Bielawski,et al.  Microbunching instability in storage rings: Link between phase-space structure and terahertz coherent synchrotron radiation radio-frequency spectra , 2014 .

[4]  Christophe Szwaj,et al.  Microbunching Instability in Relativistic Electron Bunches: Direct Observations of the Microstructures Using Ultrafast YBCO Detectors , 2016 .

[5]  Sara Casalbuoni,et al.  Numerical studies on the electro-optic detection of femtosecond electron bunches , 2008 .

[6]  Ward Wurtz,et al.  Longitudinal bunch dynamics study with coherent synchrotron radiation , 2016 .

[7]  Giuseppe Penco,et al.  Characterization of coherent THz radiation bursting regime at Elettra , 2010 .

[8]  J M Byrd,et al.  Observation of broadband self-amplified spontaneous coherent terahertz synchrotron radiation in a storage ring. , 2002, Physical review letters.

[9]  Lorenzo Rota,et al.  Fast Mapping of Terahertz Bursting Thresholds and Characteristics at Synchrotron Light Sources , 2016, 1605.00536.

[10]  A M MacLeod,et al.  Single-shot electron-beam bunch length measurements. , 2002, Physical review letters.

[11]  R. Nagaoka,et al.  Spatio-temporal dynamics of relativistic electron bunches during the micro-bunching instability in storage rings , 2012 .

[12]  A. S. Bhushan,et al.  Photonic time stretch and its application to analog-to-digital conversion , 1999 .

[13]  S. Heifets,et al.  Beam instability and microbunching due to coherent synchrotron radiation , 2002 .

[14]  P Roy,et al.  High sensitivity photonic time-stretch electro-optic sampling of terahertz pulses. , 2016, The Review of scientific instruments.

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

[16]  P. Roy,et al.  Direct Observation of Spatiotemporal Dynamics of Short Electron Bunches in Storage Rings. , 2016, Physical review letters.

[17]  Zhiping Jiang,et al.  Electro-optic measurement of THz field pulses with a chirped optical beam , 1998 .

[18]  W. A. Gillespie,et al.  Electro-optic time profile monitors for femtosecond electron bunches at the soft x-ray free-electron laser FLASH , 2009 .

[19]  Jörg Feikes,et al.  COHERENT THz MEASUREMENTS AT THE METROLOGY LIGHT SOURCE , 2010 .

[20]  P. Kuske,et al.  Electro-optical measurement of sub-ps structures in low charge electron bunches , 2012 .

[21]  M. Venturini,et al.  Bursts of coherent synchrotron radiation in electron storage rings: a dynamical model. , 2002, Physical review letters.

[22]  J.-P. Ricaud,et al.  Observing microscopic structures of a relativistic object using a time-stretch strategy , 2014, Scientific Reports.