Longitudinally Polarised Terahertz Radiation for Relativistic Particle Acceleration
This book elaborates on the acceleration of charged particles with ultrafast terahertz electromagnetic radiation. It paves the way for new, and improves many aspects of current, accelerator applications. These include providing shorter electron bunches for ultrafast time-resolved pump-probe spectroscopy, enabling complex longitudinal profiles to be imparted onto charged particle bunches and significantly improving the ability to synchronise an accelerator to an external laser.
The author has developed new sources of terahertz radiation with attractive properties for accelerator-based applications. These include a radially biased large-area photoconductive antenna (PCA) that provided the largest longitudinally polarised terahertz electric field component ever measured from a PCA. This radially biased PCA was used in conjunction with an energy recovery linear accelerator for electron acceleration experiments at the Daresbury Laboratory. To achieve even higher longitudinally polarised terahertz electric field strengths, and to be able to temporally tune the terahertz radiation, the author investigated generation within non-linear optical crystals. He developed a novel generation scheme employing a matched pair of polarity inverted magnesium-oxide doped stoichiometric lithium niobate crystals, which made it possible to generate longitudinally polarised single-cycle terahertz radiation with an electric field amplitude an order of magnitude larger than existing sources.
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2 Theoretical Background
3 Experimental Apparatus
4 Radiation Propagation Simulation
5 ALICE Energy Modulation Induced by Terahertz Radiation AEMITR
6 Photoconductive Antenna Generation
7 Nonlinear Optical Crystal Generation
8 Conclusions and Future Work
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Longitudinally Polarised Terahertz Radiation for Relativistic Particle ...
MATTHEW J. CLIFFE
No preview available - 2019
angle axis balanced detection bandwidth calculated camera charged particle conduction band ð Þ described detectors electric bias field electric field component electric field strength electro-optic detection electromagnetic radiation electron beam electron bunch enabled energy modulation focal length focusing frequency function Gaussian Gaussian beams input plane kV cm−1 lens linearly polarised lithium niobate lock-in amplifier longitudinal field longitudinally polarised electric longitudinally polarised terahertz M.J. Cliffe MgO:SLN crystals non-linear optical optical crystals optical pump optical rectification output Particle Acceleration particle bunch phase photoconductive antenna photodiode polarised component polarised electric field polarised terahertz electric polarised terahertz radiation polarity probe beam propagation pulse energies pump beam pump laser radially polarised refractive index regenerative amplifier Relativistic Particle sampling position scans seen in Fig shown in Fig simulation spatial profile spectral synchronisation temporal profile terahertz electric field terahertz pulse transverse field velocity wafer wavelength whilst ZnTe detection crystal