Compton Sources of Electromagnetic Radiation

Krafft, Geoffrey; Priebe, G.

doi:10.1142/9789814340397_0008

Cited by 9 publications

(25 citation statements)

References 19 publications

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“…Another surprising prediction is that bandwidth is largely independent on frequency spread of the incident photon beam in the deep recoil regime, that brings to a very interesting feature of deep recoil regime: the possibility to generate narrow bandwidth photon beams even using a broad bandwidth incident photon beam, and, at the same time, even over-focusing the electron beam (thanks to the suppressed dependence of bandwidth on electron beam emittance): as reported in Section III, numerical simulations nicely confirm this interesting prediction about a unique feature of deep recoil regime, that eventually leads to possible new options for ICSs designs. These two new findings enhance the analytical description of ICSs with respect to previous works [1,2,38,42,43] in predicting the behavior of the scattered photon beam phase space in deep recoil, as observed in numerical simulation of Ref. [22].…”

Section: Introductionsupporting

confidence: 68%

Analytical description of photon beam phase spaces in inverse Compton scattering sources

Curatolo

Drebot

Petrillo

et al. 2017

Phys. Rev. Accel. Beams

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We revisit the description of inverse Compton scattering sources and the photon beams generated therein, emphasizing the behavior of their phase space density distributions and how they depend upon those of the two colliding beams of electrons and photons. Main objective is to provide practical formulas for bandwidth, spectral density, brilliance, which are valid in general for any value of the recoil factor, i.e. both in the Thomson regime of negligible electron recoil, and in the deep Compton recoil dominated region, which is of interest for gamma-gamma colliders and Compton Sources for the production of multi-GeV photon beams. We adopt a description based on the center of mass reference system of the electron-photon collision, in order to underline the role of the electron recoil and how it controls the relativistic Doppler/boost effect in various regimes. Using the center of mass reference frame greatly simplifies the treatment, allowing to derive simple formulas expressed in terms of rms momenta of the two colliding beams (emittance, energy spread, etc.) and the collimation angle in the laboratory system. Comparisons with Monte Carlo simulations of inverse Compton scattering in various scenarios are presented, showing very good agreement with the analytical formulas: in particular we find that the bandwidth dependence on the electron beam emittance, of paramount importance in Thomson regime, as it limits the amount of focusing imparted to the electron beam, becomes much less sensitive in deep Compton regime, allowing a stronger focusing of the electron beam to enhance luminosity without loss of mono-chromaticity. A similar effect occurs concerning the bandwidth dependence on the frequency spread of the incident photons: in deep recoil regime the bandwidth comes out to be much less dependent on the frequency spread. The set of formulas here derived are very helpful in designing inverse Compton sources in diverse regimes, giving a quite accurate first estimate in typical operational conditions for number of photons, bandwidth, spectral density and brilliance values -the typical figures of merit of such radiation sources.

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Section: Introductionsupporting

confidence: 68%

Analytical description of photon beam phase spaces in inverse Compton scattering sources

Curatolo

Drebot

Petrillo

et al. 2017

Phys. Rev. Accel. Beams

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“…In this context, accelerator driven Compton γ -ray sources, where the collisions between laser pulses and relativistic electron bunches result in the production of high-energy photons, have a renewed interest owing to the recent developments in laser and accelerator technologies. Indeed, several Compton facilities are under construction or operation all around the world67891011. For the γ -ray facilities, especially for the facilities providing the γ -rays with an energy cutoff above 1 MeV, the Compton sources represent almost a unique opportunity.…”

mentioning

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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“…Table 1.1 shows both properties of specic installations and ranges of values for dierent types of installations [2,11]. As a generalization, the desire is for shorter pulse lengths, higher average brilliance, and coherence in the X-rays [12]. 2 × 10 22…”

Section: Introduction 11 Current X-ray Sources and Performancementioning

confidence: 99%

“…x,rms is the normalized rms horizontal emittance, and N y,rms is the normalized rms vertical emittance [12,13]. These quantities will be dened in greater detail in Section 2.2 and as discussed there, Eq.…”

Section: Introduction 11 Current X-ray Sources and Performancementioning

confidence: 99%

Inverse compton light source: a compact design proposal

Deitrick

2017

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In the last decade, there has been an increasing demand for a compact Inverse Compton Light Source (ICLS) which is capable of producing high-quality X-rays by colliding an electron beam and a high-quality laser. It is only in recent years when both SRF and laser technology have advanced enough that compact sources can approach the quality found at large installations such as the Advanced Photon Source at Argonne National Laboratory. Previously, X-ray sources were either high ux and brilliance at a large facility or many orders of magnitude lesser when produced by a bremsstrahlung source. A recent compact source was constructed by Lyncean Technologies using a storage ring to produce the electron beam used to scatter the incident laser beam. By instead using a linear accelerator system for the electron beam, a signicant increase in X-ray beam quality is possible, though even subsequent designs also featuring a storage ring oer improvement. Preceding the linear accelerator with an SRF reentrant gun allows for an extremely small transverse emittance, increasing the brilliance of the resulting X-ray source. In order to achieve suciently small emittances, optimization was done regarding both the geometry of the gun and the initial electron bunch distribution produced o the cathode. Using double-spoke SRF cavities to comprise the linear accelerator allows for an electron beam of reasonable size to be focused at the interaction point, while preserving the low emittance that was generated by the gun. An aggressive nal focusing section following the electron beam's exit from the accelerator produces the small spot size at the interaction point which results in an X-ray beam of high ux and brilliance. Taking all of these advancements together, a world class compact X-ray source has been designed. It is anticipated that this source would far outperform the conventional bremsstrahlung and many other compact ICLSs, while coming closer to performing at the levels found at large facilities than ever before. The design process, including the development between subsequent iterations, is presented here in detail, with the simulation results for this groundbreaking X-ray source.

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Compton Sources of Electromagnetic Radiation

Cited by 9 publications

References 19 publications

Analytical description of photon beam phase spaces in inverse Compton scattering sources

Analytical description of photon beam phase spaces in inverse Compton scattering sources

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

Inverse compton light source: a compact design proposal

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