Experimental studies on coherent synchrotron radiation at an emittance exchange beam line

Thangaraj, J. C. T.; Thurman‐Keup, R.; Ruan, J.; Johnson, A. S.; Lumpkin, A.H.; Santucci, J.

doi:10.1103/physrevstab.15.110702

Cited by 7 publications

(2 citation statements)

References 19 publications

(23 reference statements)

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“…A wide range of electron beam applications such as free-electron lasers (FELs) and particle accelerators employ a bunched beam for improvement of machine performance [1][2][3][4][5][6][7][8][9] in the relativistic or quasi-relativistic regimes. It is well known that a short electron pulse can lead to an appreciable improvement of energy conversion efficiencies or power growth of coherent light sources and high gradient accelerators.…”

Section: Introductionmentioning

confidence: 99%

Theoretical and numerical analyses of a slit-masked chicane for modulated bunch generation

2015

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Density modulations on electron beams can improve machine performance of beam-driven accelerators and FELs with resonance beam-wave coupling. The beam modulation is studied with a masked chicane by the analytic model and simulations with the beam parameters of the Fermilab Accelerator Science and Technology (FAST) facility. With the chicane design parameters (bending angle of 18°, bending radius of 0.95 m and R56 ~ -0.19 m) and a nominal beam of 3 ps bunch length, the analytic model showed that a slit-mask with slit period 900 µm and aperture width 300 µm induces a modulation of bunch-to-bunch spacing ~100 µm to the bunch with 2.4% correlated energy spread. With the designed slit mask and a 3 ps bunch, particle-in-cell (PIC) simulations, including nonlinear energy distributions, space charge force, and coherent synchrotron radiation (CSR) effect, also result in beam modulation with bunch-to-bunch distance around 100 µm and a corresponding modulation frequency of 3 THz. The beam modulation has been extensively examined with three different beam conditions, 2.25 ps (0.25 nC), 3.25 ps (1 nC), and 4.75 ps (3.2 nC)，by tracking code Elegant. The simulation analysis indicates that the sliced beam by the slit-mask with 3 ~ 6% correlated energy spread has modulation lengths about 187 µm (0.25 nC), 270 µm (1 nC) and 325 µm (3.2 nC). The theoretical and numerical data proved the capability of the designed masked chicane in producing modulated bunch train with micro-bunch length around 100 fs.

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Section: Introductionmentioning

confidence: 99%

Theoretical and numerical analyses of a slit-masked chicane for modulated bunch generation

2015

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“…Intense THz beams generated using gyrotrons, free electron lasers (FELs), and coherent synchrotron radiation (CSR) in particular have attracted interest for their use as next-generation beams in cutting-edge areas of physics such as nuclear fusion, isotope separation, and electron acceleration. To examine light-matter interactions using intense THz beams, it is important to determine the polarization characteristics 23 24 25 . However, conventional methods cannot easily obtain the polarization states of a beam from an intense THz source, because it is necessary to modulate the polarization both mechanically and electrically 26 .…”

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Determination of the polarization states of an arbitrary polarized terahertz beam: Vectorial vortex analysis

Wakayama

Higashiguchi

Oikawa

et al. 2015

Sci Rep

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Vectorial vortex analysis is used to determine the polarization states of an arbitrarily polarized terahertz (0.1–1.6 THz) beam using THz achromatic axially symmetric wave (TAS) plates, which have a phase retardance of Δ = 163° and are made of polytetrafluorethylene. Polarized THz beams are converted into THz vectorial vortex beams with no spatial or wavelength dispersion, and the unknown polarization states of the incident THz beams are reconstructed. The polarization determination is also demonstrated at frequencies of 0.16 and 0.36 THz. The results obtained by solving the inverse source problem agree with the values used in the experiments. This vectorial vortex analysis enables a determination of the polarization states of the incident THz beam from the THz image. The polarization states of the beams are estimated after they pass through the TAS plates. The results validate this new approach to polarization detection for intense THz sources. It could find application in such cutting edge areas of physics as nonlinear THz photonics and plasmon excitation, because TAS plates not only instantaneously elucidate the polarization of an enclosed THz beam but can also passively control THz vectorial vortex beams.

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Generation of the determined vectorial vortex beams by use of an achromatic axially symmetric waveplate

Wakayama

Higashiguchi

Otani

2017

Opt Rev

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Experimental studies on coherent synchrotron radiation at an emittance exchange beam line

Cited by 7 publications

References 19 publications

Theoretical and numerical analyses of a slit-masked chicane for modulated bunch generation

Theoretical and numerical analyses of a slit-masked chicane for modulated bunch generation

Determination of the polarization states of an arbitrary polarized terahertz beam: Vectorial vortex analysis

Generation of the determined vectorial vortex beams by use of an achromatic axially symmetric waveplate

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