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Electron Linac design to drive bright Compton back-scattering gamma-ray sources
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10.1063/1.4805071
/content/aip/journal/jap/113/19/10.1063/1.4805071
http://aip.metastore.ingenta.com/content/aip/journal/jap/113/19/10.1063/1.4805071

Figures

Image of FIG. 1.
FIG. 1.

Typical back scattering geometry between an electron bunch of longitudinal size σ and transversal size σ, moving at relativistic speed from left to right colliding with a laser pulse of waist size w and time duration T.

Image of FIG. 2.
FIG. 2.

Optimization of the beam phase space density versus charge for different frequency bands, computed using the optimization code GIOTTO. In the legend, S-120, C-170, C-200, C240, X-200 give the RF injector operation value that has been tested (S,C,X bands) and the relative Gun E filed peak; the red point on the S-band curve is the LCLS measured value.

Image of FIG. 3.
FIG. 3.

Energy spread versus bunch length for different RF frequencies: red solid line for the S-band, blue dashed line for C-band, and dashed and dotted black line for X-band. The ELI-NP energy spread maximum threshold is 0.1% and 0.05%; safe values are reported in black dashed lines.

Image of FIG. 4.
FIG. 4.

Photocathode laser pulse shape used in beam dynamic simulations. (a) Reference working point, Q = 250 pC. (b) Commissioning working point, Q = 25 pC.

Image of FIG. 5.
FIG. 5.

TSTEP output for the reference working point, Q = 250 pC. (a) Evolution of emittance, transverse and longitudinal envelopes in the S-band photo-injector. (b) Transverse (top) and longitudinal (bottom) phase space at the photo-injector exit.

Image of FIG. 6.
FIG. 6.

TSTEP output for the commissioning beam, Q = 25 pC.Operation mode: no RF compression (a) Evolution of emittance, transverse and longitudinal envelopes in the S-band photo-injector. (b) Transverse (top) and longitudinal (bottom) phase space at the photo-injector exit.

Image of FIG. 7.
FIG. 7.

Initial transverse distributions used into computations. On the top the uniform one, on the bottom the truncated Gaussian one, with σ = 0.4 mm. On the left the spot sizes, on the right horizontal and vertical projections.

Image of FIG. 8.
FIG. 8.

Q = 250 pC. Left: computed emittance evolution in the ELI S-band photo-injector for a uniform and a truncated Gaussian with σx = 0.4 mm. Right: computed output phase space for the truncated Gaussian distribution.

Image of FIG. 9.
FIG. 9.

Q = 390 pC and initial Gaussian truncated distribution with σx = 0.4 mm. Left: emittance and envelopes evolution in the S-band photo-injector. Right: Output computed phase spaces.

Image of FIG. 10.
FIG. 10.

RF Linac schematic layout from the photo-injector exit down the two interaction points.

Image of FIG. 11.
FIG. 11.

Twiss parameters of the low energy beamline from the photo-injector exit down to the low energy interaction point.

Image of FIG. 12.
FIG. 12.

Twiss parameters of the high energy beamline from the photo-injector exit down to the high energy interaction point.

Image of FIG. 13.
FIG. 13.

Pill box cavity model considered for the wake-field calculations: a is the iris radius, L is the cell length, and b and g are the cavity radius and length, respectively.

Image of FIG. 14.
FIG. 14.

Longitudinal and transverse short range wake-fields curve integrated over one cell for the S-band accelerating structure (red curve) and for the C-band structure (blue curve).

Image of FIG. 15.
FIG. 15.

Transverse beam size and distribution plus the longitudinal one for the reference working point electron beam at the low (left) and high (right) energy interaction point.

Image of FIG. 16.
FIG. 16.

Beam energy spread, beam energy and beam current distribution of the reference working point at low energy IP (above), and at high energy IP (bottom).

Image of FIG. 17.
FIG. 17.

Input power profiles to compensate the beam loading in the S-band (a) and C-band (b) structures.

Image of FIG. 18.
FIG. 18.

Energy spread induced by beam loading in the S-band (a) and C-band structures (b) with and without compensation (q = 250 pC, 40 bunches, and ΔT = 15 ns).

Image of FIG. 19.
FIG. 19.

Mechanical drawing of the C-band damped structure accelerating cells.

Tables

Generic image for table
Table I.

Summary of gamma-ray beam specifications.

Generic image for table
Table II.

Laser beam parameters.

Generic image for table
Table III.

Electron beam parameters, at the C-band booster injection, for the S-band photo-injector.

Generic image for table
Table IV.

Electron beam parameters at the low and high energy interaction point.

Generic image for table
Table V.

Parameters of the TW accelerating structures used in the beam loading calculation.

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/content/aip/journal/jap/113/19/10.1063/1.4805071
2013-05-20
2014-04-25
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Electron Linac design to drive bright Compton back-scattering gamma-ray sources
http://aip.metastore.ingenta.com/content/aip/journal/jap/113/19/10.1063/1.4805071
10.1063/1.4805071
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