Low-Intensity Nonlinear Spectral Effects in Compton Scattering

Hartemann, F. V.; Albert, F.; Siders, C. W.; Barty, C. P. J.

doi:10.1103/physrevlett.105.130801

Cited by 30 publications

(31 citation statements)

References 16 publications

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“…In the case of a weakly focused laser pulse (typical for Compton scattering sources), the coordinates of the wave vector ðk x ; k y ; k z Þ remain close to their initial values ð0; 0; k 0 Þ [11]. The exact nonlinear planewave solution for the 4-velocity has been derived in earlier work [11][12][13]:…”

Section: B Spectral Broadening Mechanismsmentioning

confidence: 95%

Design of narrow-band Compton scattering sources for nuclear resonance fluorescence

Albert

Anderson

Gibson

et al. 2011

Phys. Rev. ST Accel. Beams

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The design of narrow-band Compton scattering sources for specific applications using nuclear resonance fluorescence (NRF) is presented. NRF lines are extremely narrow (ÁE=E $ 10 À6 ) and require spectrally narrow sources to be excited selectively and efficiently. This paper focuses on the theory of spectral broadening mechanisms involved during Compton scattering of laser photons from relativistic electron beams. It is shown that in addition to the electron beam emittance, energy spread, and the laser parameters, nonlinear processes during the laser-electron interaction can have a detrimental effect on the gamma-ray source bandwidth, including a newly identified weakly nonlinear phase shift accumulated over the effective interaction duration. Finally, a design taking these mechanisms into consideration is outlined.

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Section: B Spectral Broadening Mechanismsmentioning

confidence: 95%

Design of narrow-band Compton scattering sources for nuclear resonance fluorescence

Albert

Anderson

Gibson

et al. 2011

Phys. Rev. ST Accel. Beams

Self Cite

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“…It states how the laser frequency should increase during the course of the pulse in order to counterbalance the gradual intensity dependent red-shift due to the ponderomotive slow-down of the electrons. Equation (31) relates the local laser frequency ω(x + ) to the laser pulse envelope g(x + ) such that our initial assumption in Section II A that ω(x + ) changes on the same slow time scale as g(x + ) is fulfilled. It is remarkable that the optimal frequency modulation is not influenced by the electron recoil, as Eq.…”

Section: Ponderomotive Broadening and Its Compensation By Laser mentioning

confidence: 99%

“…This ponderomotive broadening is a nonlinear finite-pulse-length effect that is relevant whenever the laser bandwidth is small enough to resolve the ponderomotive red-shift of the scattered radiation [24,31]. Thus, one needs to keep the laser intensity low enough for the bandwidth requirements, which limits the x-ray's spectral brightness [24,26].…”

Section: Introductionmentioning

confidence: 99%

Narrowband inverse Compton scattering x-ray sources at high laser intensities

et al. 2015

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Narrowband x-and gamma-ray sources based on the inverse Compton scattering of laser pulses suffer from a limitation of the allowed laser intensity due to the onset of nonlinear effects that increase their bandwidth. It has been suggested that laser pulses with a suitable frequency modulation could compensate this ponderomotive broadening and reduce the bandwidth of the spectral lines, which would allow to operate narrowband Compton sources in the high-intensity regime. In this paper we, therefore, present the theory of nonlinear Compton scattering in a frequency modulated intense laser pulse. We systematically derive the optimal frequency modulation of the laser pulse from the scattering matrix element of nonlinear Compton scattering, taking into account the electron spin and recoil. We show that, for some particular scattering angle, an optimized frequency modulation completely cancels the ponderomotive broadening for all harmonics of the backscattered light. We also explore how sensitive this compensation depends on the electron beam energy spread and emittance, as well as the laser focusing.

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“…Examples of such facilities are the high intensity gammaray source (HIGS) [11], and the under construction Extreme Light Infrastructure Nuclear Physics GammaBeam System in Romania (ELI-NP GBS) [12]. LLNL has a long history of work on narrowband gamma-ray light sources [13][14][15][16][17][18][19][20], and designed the all X-band VELOCIRAPTOR linac [21]. The X-band photoinjector [22] discussed here was originally designed to serve as the electron source for the VELOCIRAPTOR, and LLNL commissioned the MEGa-ray (Mono-Energetic Gammaray) Test Station (MTS) to leverage hardware in hand into a platform for developing the critical technologies for optimized Laser-Compton scattering with an X-band accelerator [23].…”

Section: Introductionmentioning

confidence: 99%

Performance of a second generation X -band rf photoinjector

Marsh

Anderson

et al. 2018

Phys. Rev. Accel. Beams

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rf photoinjectors produce incredibly bright electron beams enabling advanced photon science applications such as the current generation of free electron lasers and high energy x-rays and gammarays via laser-Compton scattering. A second generation 5.59 cell X-band rf gun has been developed, installed, conditioned, commissioned, tuned, and used to produce laser-Compton x-rays and multiple electron bunches. A charge per bunch from a few pC to 500 pC has been measured, consistent with a quantum efficiency of 5 × 10 −5 using a 263 nm 10 Hz photocathode drive laser. The rf gun has operated close to design performance at high gradient, and more reliably at lower gradient achieving a root mean square normalized emittance of 0.3 mm mrad at both 80 pC at 185 MV=m, and 40 pC at 165 MV=m. Thermal emittance is estimated at 0.55 mm mrad=mm. Energy spread of 0.03% has been achieved. These results agree very well with modeling predictions for the operating conditions under which the measurements were made. Unusually disruptive breakdowns were observed with an applied magnetic field of 0.5T used for emittance compensation.

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Low-Intensity Nonlinear Spectral Effects in Compton Scattering

Cited by 30 publications

References 16 publications

Design of narrow-band Compton scattering sources for nuclear resonance fluorescence

Design of narrow-band Compton scattering sources for nuclear resonance fluorescence

Narrowband inverse Compton scattering x-ray sources at high laser intensities

Performance of a second generation X -band rf photoinjector

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