Laser-Compton scattering from a 20MeV electron beam

Chouffani, K.; Wells, Douglas P.; Harmon, F.; Jones, James L.; Lancaster, G.

doi:10.1016/s0168-9002(02)01580-2

Cited by 26 publications

(15 citation statements)

References 23 publications

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“…6). The accelerator layout and characteristics can be found in [2]. The layout of the experiment is shown in Fig.…”

Section: Resultsmentioning

confidence: 99%

“…The radiation is emitted in the direction of the electron beam, in a cone of half angle equal to 1= where is the electron relativistic factor. The energy of LCS x rays is tunable [2], the x-ray energy can be tuned by changing the electron beam energy, laser wavelength, observation and crossing angles with respect to the electron beam direction. LCS can happen at any crossing angle (Fig.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Determination of electron beam parameters by means of laser-Compton scattering

Chouffani¹,

Harmon²,

Wells³

et al. 2006

Phys. Rev. ST Accel. Beams

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Laser-Compton scattering (LCS) experiments were carried out at the Idaho Accelerator Center using the 5 ns (FWHM) and 22 MeV electron beam. The electron beam was brought to an approximate head-on collision with a 29 MW, 7 ns (FWHM), 10 Hz Nd:YAG laser. Clear and narrow x-ray peaks resulting from the interaction of relativistic electrons with the Nd:YAG laser second harmonic line at 532 nm were observed. We have developed a relatively new method of using LCS as a nonintercepting electron beam monitor. Our method focused on the variation of the shape of the LCS spectrum rather than the LCS intensity as a function of the observation angle in order to extract the electron beam parameters at the interaction region. The electron beam parameters were determined by making simultaneous fits to spectra taken across the LCS x-ray cone. This scan method allowed us also to determine the variation of LCS xray peak energies and spectral widths as a function of the detector angles. Experimental data show that in addition to being viewed as a potential bright, tunable, and quasimonochromatic x-ray source, LCS can provide important information on the electron beam pulse length, direction, energy, angular and energy spread. Since the quality of LCS x-ray peaks, such as degree of monochromaticity, peak energy and flux, depends strongly on the electron beam parameters, LCS can therefore be viewed as an important nondestructive tool for electron beam diagnostics.

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“…6). The accelerator layout and characteristics can be found in [2]. The layout of the experiment is shown in Fig.…”

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Determination of electron beam parameters by means of laser-Compton scattering

Chouffani¹,

Harmon²,

Wells³

et al. 2006

Phys. Rev. ST Accel. Beams

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“…It may be used to study atom and molecule motion on the femtosecond time scale, advanced biomedical imaging and lossless detection of high Z materials (Joshi & Corkum, 1995;Schoenlein et al, 1996;Attwood, 1999). Such source has already been demonstrated through ultrashort lasers synchronized to an radio frequency electron gun Ting et al, 1996;Pogorelsky et al, 2000;Chouffani et al, 2002;Gibson et al, 2004) or wakefield accelerated electrons (Schwoerer et al, 2006). But due to the tiny cross-section of Thomson scattering and the low electron density, photon production of Thomson scattering source is too low for practical use.…”

Section: Introductionmentioning

confidence: 99%

Numerical investigation for shape controlling of ultrathin electron layer

Tan

Zhu

et al. 2012

Laser Part. Beams

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To control the shape of the ultra-thin electron layer produced by directly interaction of ultrahigh contrast laser with ultrathin foil target, we investigated the spacial distribution and temporal evolution of electron layers produced from single and double foil targets through two-dimensional particle-in-cell simulations. Results show that electron layers produced from double foil targets can fly with unperturbed velocity for a much longer time than in the single foil case, which can be explained by the integrated contribution of charge separation field from both the two foils. Further studies show that through adjusting the foil expansion, electron layers with different shapes can be obtained. Detailed studies on the forming process of layers show that electron momentum distribution evolves rapidly along with the pump laser and then the vanishing of electron transverse momentum induced by the reflected laser results in the forming of layer shape. So different foil expansion corresponds to different moments that reflected laser interact with electron layer, when the electron transverse momentum distribution is different. After the reflected laser interact with electron layer, the resultant longitude momentum distribution will finally lead to various electron layer shapes.

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“…[6][7][8][9][10][11][12][13][14][15][16] Various studies and programs have been proposed and implemented worldwide to date. TS x-ray source was demonstrated in 1996 in a 90 geometry 17 and subsequently carried out in a number of laboratories, 13,14,[18][19][20][21][22][23][24][25][26] typically employing circular or linear polarization laser pulse scattered by conventional linac electron beam in a backscattering or orthogonal geometry. Taking advantage of laser wakefield acceleration, 27 all-optical TS x-ray source schemes were proposed.…”

Section: Introductionmentioning

confidence: 99%

Surpassing one x-ray photon per electron in nonlinear Thomson scattering in 180° geometry

Zhao

Yuan

et al. 2012

Physics of Plasmas

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We have obtained the general analytical expressions of harmonic radiation for Thomson scattering (TS) of arbitrary polarized laser by virtue of generalized Bessel functions and derived the extremum conditions for backscattered harmonics. Especially, for the fundamental backscattered Thomson scattering x-ray yield, we have shown that at the same conditions, the circular polarization reaches maximum while the linear case minimum. This effect is significant when a 2 ! 1. With the assumption that the x-ray photon yield of a realistic focused pulse of energy E, wavelength k, and Rayleigh range z R is equivalent to a plane wave pulse containing N l cycles via the relation N l k ¼ pz R where the effective factor p is of order one, we applied the plane wave results to realistic laser pulses and deduced that the backscattered x-ray photon number N f per electron achieves its peak value when the average dimensionless laser intensity a 2 ¼ 0:677 and is irrelevant to the value of p. Since N f and its maximum N f max both scale with the square root of E=k, it is realizable to attain N f ! 1 using joule-scale laser pulses while a great challenge for N f > 10.

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Laser-Compton scattering from a 20MeV electron beam

Cited by 26 publications

References 23 publications

Determination of electron beam parameters by means of laser-Compton scattering

Determination of electron beam parameters by means of laser-Compton scattering

Numerical investigation for shape controlling of ultrathin electron layer

Surpassing one x-ray photon per electron in nonlinear Thomson scattering in 180° geometry

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