Demonstration of Model-Independent Control of the Longitudinal Phase Space of Electron Beams in the Linac-Coherent Light Source with Femtosecond Resolution.

The dynamics of intense electron bunches in free electron lasers and plasma wakefield accelerators are dominated by complex collective effects such as wakefields, space charge, coherent synchrotron radiation, and drift unpredictably with time, making it difficult to control and tune beam properties using model-based approaches. We report on a first of its kind combination of automatic, model-independent feedback with a neural network for control of the longitudinal phase space of relativistic electron beams with femtosecond resolution based only on transverse deflecting cavity measurements.

[1]  D. Edstrom,et al.  Neural Networks for Modeling and Control of Particle Accelerators , 2016, IEEE Transactions on Nuclear Science.

[2]  Alexander Scheinker,et al.  Adaptive method for electron bunch profile prediction , 2015 .

[3]  Nora Berrah,et al.  Fresh-slice multicolour X-ray free-electron lasers , 2016, Nature Photonics.

[4]  P Emma,et al.  Measurements and simulations of ultralow emittance and ultrashort electron beams in the linac coherent light source. , 2009, Physical review letters.

[5]  W. Schlotter,et al.  Experimental demonstration of a soft x-ray self-seeded free-electron laser. , 2015, Physical review letters.

[6]  A. Fisher,et al.  Coherent-radiation spectroscopy of few-femtosecond electron bunches using a middle-infrared prism spectrometer. , 2013, Physical review letters.

[7]  Alexander Scheinker.  MODEL INDEPENDENT BEAM TUNING , 2013 .

[8]  Felice Andrea Pellegrino,et al.  Free-electron laser spectrum evaluation and automatic optimization , 2017 .

[9]  P. Krejcik,et al.  Few-femtosecond time-resolved measurements of X-ray free-electron lasers , 2014, Nature Communications.

[10]  Alexander Scheinker,et al.  Constrained extremum seeking stabilization of systems not affine in control , 2018 .

[11]  D. Ratner,et al.  First lasing and operation of an ångstrom-wavelength free-electron laser , 2010 .

[12]  Nan Phinney,et al.  FACET-II Accelerator Research with Beams of Extreme Intensities , 2016 .

[13]  T. Raubenheimer.  Technical Challenges of the LCLS-II CW X-ray FEL , 2015 .

[14]  R. Lindberg,et al.  Demonstration of self-seeding in a hard-X-ray free-electron laser , 2012, Nature Photonics.

[15]  Antonio-José Almeida,et al.  NAT , 2019, Springer Reference Medizin.

[16]  Brendan O'Shea,et al.  Plasma wakefield acceleration experiments at FACET II , 2018 .