Design and operation of a tunable MeV-level Compton-scattering-based<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>γ</mml:mi></mml:math>-ray source

Gibson, D. J.; Albert, F.; Anderson, S. G.; Betts, S.; Messerly, M. J.; Phan, H; Semenov, Vladimir; Shverdin, M. Y.; Tremaine, A.; Hartemann, F. V.; Siders, C. W.; McNabb, D. P.; Barty, C. P. J.

doi:10.1103/physrevstab.13.070703

Cited by 67 publications

(33 citation statements)

References 24 publications

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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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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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“…The injector plays a significant role in accelerator facilities for free-electron laser (FEL) light sources, energy recovery linacs (ERLs), electron colliders, and Thomson backscattering sources [1][2][3][4]. In recent years, superconducting rf photoinjectors (SRF gun) have drawn a lot of attention because of their characters: continuous-wave (cw) operation, flexible bunch structures, low emittance compared to the other high average current sources [5] and the potential application for polarized beam generation [6].…”

Section: Introductionmentioning

confidence: 99%

Experimental studies of dark current in a superconducting rf photoinjector

Xiang

Arnold

Kamps

et al. 2014

Phys. Rev. ST Accel. Beams

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A superconducting rf photoinjector (SRF gun) has been put in operation successfully at the radiation source ELBE. It produces a 13 MHz, low emittance, cw beam with beam current up to 400 μA and energy of 3 MeV. During the gun operation, the field emission from the niobium cavity and the Cs 2 Te cathodes produces dark current. In this paper, we study the dark current of the SRF gun by using the existing diagnostics beam line. The dependency of the intensity and the energy spectrum on the cavity gradient and the cathode voltage are examined, and the emission sources are analyzed. Furthermore, the new project of installing a strip line kicker to reduce the dark current effect is presented.

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“…L and to the relativistic Doppler factor 4 2 . Recently, production of subpicosecond, high flux keV x rays using the ICS technique [2][3][4][5], as well as their use in various applications, have been proposed and demonstrated [6][7][8]. These applications have included phase contrast imaging [9] and single shot diffraction from a crystal [10].…”

Section: Introductionmentioning

confidence: 99%

Harmonic radiation of a relativistic nonlinear inverse Compton scattering using two laser wavelengths

Sakai

Williams

Andonian

et al. 2011

Phys. Rev. ST Accel. Beams

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The use of two different wavelength lasers in the nonlinear regime of the inverse Compton scattering interaction is proposed in order to provide a new strategy for controlling scattered photon energy distributions in the x-ray to -ray spectral region. In this nonlinear interaction, the component of the relativistic electron's trajectory driven by a longer-wavelength laser with the normalized vector potential a L $ 1 is a large oscillatory figure-8; in the proposed scenario a rapid small-amplitude oscillation induced by a shorter-wavelength laser is superimposed upon this figure-8. Thus, the electron's momentum is mainly supplied from longer-wavelength laser, while the high-frequency part of the acceleration is given by shorter-wavelength laser. In this way, the harmonics radiated at high frequency from the oscillating electron can be strongly modified by the nonlinear motion initiated by the low frequency, large a L laser resulting in the generation of the harmonics with the photon energy of 4 2 @ð! L;short þ n! L;long Þ. In this paper, the electron's kinetics in the two-wavelength laser field and the concomitant emitted radiation spectrum are examined, with numerical illustrations based on a classical Lienard-Wiechert potential formalism provided.

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Design and operation of a tunable MeV-level Compton-scattering-basedγ-ray source

Cited by 67 publications

References 24 publications

Performance of a second generation X -band rf photoinjector

Performance of a second generation X -band rf photoinjector

Experimental studies of dark current in a superconducting rf photoinjector

Harmonic radiation of a relativistic nonlinear inverse Compton scattering using two laser wavelengths

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