Subradiant spontaneous undulator emission through collective suppression of shot noise

Ratner, Daniel; Hemsing, E.; Gover, A.; Marinelli, Agostino; Nause, Ariel

doi:10.1103/physrevstab.18.050703

Cited by 11 publications

(4 citation statements)

References 35 publications

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“…Suppression of shot-noise in the early stages of electron beam acceleration would be a way to deter the start of sideband instability out of noise. Theoretically the scaling of noise suppression schemes could reach X-Ray frequencies [177] but these have been demonstrated so far only at optical frequencies [174][175][176].…”

Section: Multi-frequency Effectsmentioning

confidence: 99%

Superradiant and stimulated-superradiant emission of bunched electron beams

et al. 2019

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We outline the fundamental coherent radiation emission processes from a bunched charged particles beam. In contrast to spontaneous emission of radiation from a random electron beam that is proportional to the number of particles, a pre-bunched electron beam can emit spontaneously coherent radiation proportional to the number of particles -squared, through the process of (spontaneous) superradiance (SP-SR) (in the sense of Dicke's). The coherent SP-SR emission of a bunched electron beam can be even further enhanced by a process of stimulated-superradiance (ST-SR) in the presence of a seed injected radiation field. In this review, these coherent radiation emission processes for both single bunch and periodically bunched beams are considered in a model of radiation mode expansion.We also analyze here the SP-SR and ST-SR processes in the nonlinear regime, in the context of enhanced undulator radiation from a uniform undulator (wiggler) and in the case of wiggler Tapering-Enhanced Stimulated Superradiant Amplification (TESSA).The processes of SP-SR and TESSA take place also in tapered wiggler seed-injected FELs. In such FELs, operating in the X-Ray regime, these processes are convoluted with other effects. However these fundamental emission concepts are useful guidelines in efficiency enhancement strategy of wiggler tapering. Based on this model we review previous works on coherent radiation sources based on SP-SR (coherent undulator radiation, synchrotron radiation, Smith-Purcell radiation etc.), primarily in the THz regime and on-going works on tapered wiggler efficiency-enhancement concepts in various frequency regimes.

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Section: Multi-frequency Effectsmentioning

confidence: 99%

Superradiant and stimulated-superradiant emission of bunched electron beams

et al. 2019

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“…Spontaneous undulator radiation [47][48][49][50] by a beam of randomly injected electrons is incoherent. Thus, the total emitted radiation energy is proportional to the number of electrons (N e ), while the field average vanishes due to random interference of the generated wave packets [51,52]. To obtain superradiance [53,54], it is required that the electron bunch duration (t b ) will be shorter than the radiation period (t b << 2π ω ).…”

Section: Tapering-enhanced Superradiancementioning

confidence: 99%

High-Power Terahertz Free Electron Laser via Tapering-Enhanced Superradiance

Feigin,

Gover,

Friedman

et al. 2024

Electronics

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A superradiant FEL in the THz (3 THz) region is currently operating at Ariel University. It is based on the novel ORGAD accelerator, which is a hybrid linear RF photo-cathode 6 MeV electron gun. The hybrid term stands for its unique standing wave (SW)—traveling wave (TW) structure. The undulator generates spontaneous superradiance, which corresponds to spontaneous emission when the electron bunch duration is shorter than the radiated frequency, resulting in a much higher photon yield. However, the efficiency of this scheme is still quite low. In order to achieve higher emission (by improved efficiency), we intend to implement a new and promising radiative interaction scheme: tapering-enhanced superradiance (TES). This particular undulator design employs a tapered (amplitude) undulator in the zero-slippage condition to obtain a significantly more powerful and efficient THz radiation source. At the current stage, the scheme is designed for emission at approximately 0.5 THz. The design and start-to-end simulations demonstrate significant enhancement of superradiant energy and extraction efficiency using this method compared to a reference uniform case.

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“…• suppression of synchrotron radiation for circular e + e − and hadron colliders by (1) shaping the beam: classically a time-invariant beam -like a constant-current loop -does not radiate, i.e., it does not emit any electromagnetic waves; for the same reason a quieter beam or a crystalline beam would radiate less [13,14]; and/or by (2) tayloring the beam-pipe boundary: a large bending radius ρ combined with a small chamber suppresses SR emission at long wavelengths; specifically, radiation is shielded at wavelengths λ ≥ 2 d 3 /ρ, where d denotes the beam-pipe diameter [15];…”

Section: Mitigating Synchrotron Radiationmentioning

confidence: 99%

Future colliders for particle physics—“Big and small”

Zimmermann

2018

Nuclear Instruments and Methods in Physics Research Section A:

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Discoveries at high-energy particle colliders have established the standard model of particle physics. Technological innovation has helped to increase the collider energy at a much faster pace than the corresponding costs. New concepts will allow reaching ever higher luminosities and energies throughout the coming century. Cost-effective strategies for the collider implementation include staging. For example, a future circular collider could first provide electron-positron collisions, then hadron collisions (proton-proton and heavy-ion), and finally the collision of muons. Cooling-free muon colliders, realizable in a number of ways, promise an attractive and energy-efficient path towards lepton collisions at tens of TeV. While plasma accelerators and dielectric accelerators offer unprecedented gradients, the construction of a high-energy collider based on these new technologies still calls for significant improvements in cost and performance. Pushing the accelerating gradients or bending fields ever further, the breakdown of the QED vacuum may set an ultimate limit to electromagnetic acceleration. Finally, some ideas are sketched for reaching, or exceeding, the Planck energy.

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Subradiant spontaneous undulator emission through collective suppression of shot noise

Cited by 11 publications

References 35 publications

Superradiant and stimulated-superradiant emission of bunched electron beams

Superradiant and stimulated-superradiant emission of bunched electron beams

High-Power Terahertz Free Electron Laser via Tapering-Enhanced Superradiance

Future colliders for particle physics—“Big and small”

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