Abstract
Generation of extreme bright coherent synchrotron radiation in a short wavelength range is of remarkable interest in the synchrotron light source community. In this paper, a novel technique is adopted to produce the coherent radiation which uses an angular dispersion to enhance the micro-bunch by a tiny amplitude of energy modulation. This scheme can be inserted in a long straight section of a storage ring. A lattice design of an extreme-low emittance storage ring with 3.5 GeV energy is presented in this paper, which employs a higher order achromat (HOA) concept. We show the design results for the multi-bend achromat (MBA) lattice with an emittance of 20 pm-rad in about 900-meter circumference. Numerical simulations demonstrated that this angular dispersion induced micro-bunch scheme can be used to generate coherent radiation near soft x-ray region, the repetition rate can reach 10 kHz and the spectral brightness can reach 3*10^24phs/s/mm^2/mrad^2/0.1%BW.
Highlights
The development of linac-based free-electron laser (FEL) and storage ring-based synchrotron radiation light sources has brought unprecedented revolutionary research tools to the fields of physics, chemistry, life science, and material science and greatly promoted the development of related science [1]
This is because the nonlinearity of the storage ring increasingly distorts the phase space through filamentation over many turns, which leads to the false image of the increasing of the emittance when calculating the vertical pemffiffiiffitffitffiffiaffiffinffifficffiffieffiffiffiffiεffiffiyffiffiffiffiaffifficffifficffiffiffioffiffirffidffiffiffiiffinffi g to the statistical definition εy 1⁄4 hy2ihy02i − hy · y0i2, where y is the vertical coordinate and y0 is the vertical divergence
The possible performance of the proposed angular dispersioninduced microbunching (ADM) scheme employing a 3-m-long helical undulator with a period of 6 cm was evaluated according to 3D simulations for sixthharmonic (44.3 nm) radiation, which were conducted using the GENESIS code [46] along with the bunched electron beam simulated using the ELEGANT code based on the optimized storage ring
Summary
The development of linac-based free-electron laser (FEL) and storage ring-based synchrotron radiation light sources has brought unprecedented revolutionary research tools to the fields of physics, chemistry, life science, and material science and greatly promoted the development of related science [1]. A strong seed laser with a peak power in the range of 1–100 GW is needed to introduce sufficient energy modulation, and the depth of energy modulation must be limited to ensure that the quality of the electron beam is not degraded These many practical limitations have seriously hampered the development of combined CHG-FEL and storage ring technologies over the past two decades. Numerical simulation results obtained for an extremely low emittance 3.5 GeV storage ring adopting an advanced higher-order achromat (HOA) lattice demonstrate that the proposed angular dispersioninduced microbunching (ADM) scheme [20−23] generates coherent radiation near the soft x-ray region and obtains a 10 kHz repetition rate with an average brightness of 2.3 × 1024 photons s−1 mm−2 mrad−2 ð0.1% bandwidthÞ−1, which is 2 orders of magnitude greater than fourth-generation synchrotron light sources.
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