Design and optimization of a highly efficient optical multipass system for<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mi>γ</mml:mi></mml:mrow></mml:math>-ray beam production from electron laser beam Compton scattering

Dupraz, Kevin; Cassou, K.; Delerue, Nicolas; Fichot, P.; Martens, A.; Stocchi, A.; Variola, A.; Zomer, F.; Courjaud, Antoine; Mottay, Eric; Druon, Frédéric; Gatti, G.; Ghigo, A.; Hovsepian, T.; Riou, J. Y.; Wang, F.; Mueller, A. C.; Palumbo, L.; Serafini, L.; Tomassini, P.

doi:10.1103/physrevstab.17.033501

Cited by 44 publications

(26 citation statements)

References 44 publications

(68 reference statements)

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“…Magnitude (upper plots) and phase advance per cell (bottom plots) of the prototype accelerating structure before (a) and after (b) tuning. 2 In the field measurement, it is possible to note that the measured field immediately after the output coupler does not go to zero, as expected. This is due to the fact that the field measurement in each point is obtained by subtracting the perturbed S 11 (with the bead in) and the unperturbed one (bead out).…”

Section: Low-power Tests and Tuning Resultssupporting

confidence: 69%

“…fabricated structure, respectively. 2 The tuning has been done acting on four small deformation tuners using the same procedure already illustrated and adopted in Refs. [7,16] and following the procedure illustrated in Ref.…”

Section: Low-power Tests and Tuning Resultsmentioning

confidence: 99%

“…The gamma-ray beam system of the European project Extreme Light Infrastructure-Nuclear Physics (ELI-NP) [1] foresees the use of a multibunch train of electrons colliding with a high-intensity recirculated laser pulse [2], thus generating an intense source of gamma-ray photons by Compton backscattering. The 32 electron bunches, each carrying 250 pC of charge and separated by 16 ns, will be accelerated in an rf pulse at a repetition rate of 100 Hz.…”

Section: Introductionmentioning

confidence: 99%

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Realization and high power test of damped C -band accelerating structures

Alesini

Bellaveglia

Cardelli

et al. 2020

Phys. Rev. Accel. Beams

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The linac of the European project Extreme Light Infrastructure-Nuclear Physics (ELI-NP) foresees the use of 12 traveling wave C-band accelerating structures. The cavities are 1.8 m long, quasiconstant gradient, and have a field phase advance per cell of 2π=3. They operate at 100 Hz repetition rate, and, because of the multibunch operation, they have been designed with a dipole higher-order mode (HOM) damping system to avoid beam breakup. The structures have symmetric input and output couplers and integrate, in each cell, a damping system based on silicon carbide (SiC) rf absorbers coupled to each cell through waveguides. An optimization of the electromagnetic and mechanical design has been done to simplify the fabrication and to reduce the costs. The cavities have been fabricated, and the first full-scale prototype has been also successfully tested at the nominal gradient of 33 MV=m, repetition rate of 100 Hz, and pulse length of 820 ns. It represents, to our knowledge, the first full-scale linac structure with HOM damping waveguides and SiC absorbers tested at this high gradient. In the paper, we illustrate the realization process of such a complicated device together with the low and high power test results.

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Section: Low-power Tests and Tuning Resultssupporting

confidence: 69%

Section: Low-power Tests and Tuning Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Realization and high power test of damped C -band accelerating structures

Alesini

Bellaveglia

Cardelli

et al. 2020

Phys. Rev. Accel. Beams

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“…It will deliver photons with energies ranging from 0.2 MeV to 20 MeV with an excellent spectral density of photons reaching 5000 ph/(s ⋅ eV) at 2 MeV and 10 MeV and the photon bandwidth ≤0.5% needed for the NRF experiments7. It was chosen to implement a linac with an optical circulator36 instead of an electron ring and a FPC. In this case, using a FPC in burst mode is also a possible solution.…”

Section: Discussionmentioning

confidence: 99%

High flux circularly polarized gamma beam factory: coupling a Fabry-Perot optical cavity with an electron storage ring

Chaikovska

Cassou

Chiche

et al. 2016

Sci Rep

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We report and discuss high-flux generation of circularly polarized γ-rays by means of Compton scattering. The γ-ray beam results from the collision of an external-cavity-enhanced infrared laser beam and a low emittance relativistic electron beam. By operating a non-planar bow-tie high-finesse optical Fabry-Perot cavity coupled to a storage ring, we have recorded a flux of up to (3.5 ± 0.3) × 108 photons per second with a mean measured energy of 24 MeV. The γ-ray flux has been sustained for several hours. In particular, we were able to measure a record value of up to 400 γ-rays per collision in a full bandwidth. Moreover, the impact of Compton scattering on the electron beam dynamics could be observed resulting in a reduction of the electron beam lifetime correlated to the laser power stored in the Fabry-Perot cavity. We demonstrate that the electron beam lifetime provides an independent and consistent determination of the γ-ray flux. Furthermore, a reduction of the γ-ray flux due to intrabeam scattering has clearly been identified. These results, obtained on an accelerator test facility, warrant potential scaling and revealed both expected and yet unobserved effects. They set the baseline for further scaling of the future Compton sources under development around the world.

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“…The reference electron beams for various working points and the nominal laser parameters and interaction conditions [30] have been used (see Table I). In particular, in our calculations, the laser is considered 100% polarized [40]. Since, however, the expected laser polarization at ELI-NP is higher than 98%, the effective polarization figures reported in graphs and tables should be normalized by this factor.…”

Section: B Compton Source Eli-npmentioning

confidence: 99%

Polarization of x-gamma radiation produced by a Thomson and Compton inverse scattering

Petrillo

Bacci

Curatolo

et al. 2015

Phys. Rev. ST Accel. Beams

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A systematic study of the polarization of x-gamma rays produced in Thomson and Compton scattering is presented, in both classical and quantum schemes. Numerical results and analytical considerations let us to establish the polarization level as a function of acceptance, bandwidth and energy. Few sources have been considered: the SPARC_LAB Thomson device, as an example of a x-ray Thomson source, ELI-NP, operating in the gamma range. Then, the typical parameters of a beam produced by a plasma accelerator has been analyzed. In the first case, with bandwidths up to 10%, a contained reduction (<10%) in the average polarization occurs. In the last case, for the nominal ELI-NP relative bandwidth of 5 × 10 −3 , the polarization is always close to 1. For applications requiring larger bandwidth, however, a degradation of the polarization up to 30% must be taken into account. In addition, an all optical gamma source based on a plasma accelerated electron beam cannot guarantee narrow bandwidth and high polarization operational conditions required in nuclear photonics experiments.

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Design and optimization of a highly efficient optical multipass system forγ-ray beam production from electron laser beam Compton scattering

Cited by 44 publications

References 44 publications

Realization and high power test of damped C -band accelerating structures

Realization and high power test of damped C -band accelerating structures

High flux circularly polarized gamma beam factory: coupling a Fabry-Perot optical cavity with an electron storage ring

Polarization of x-gamma radiation produced by a Thomson and Compton inverse scattering

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