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Precision linac and laser technologies for nuclear photonics gamma-ray sourcesa)
a)Paper PI3 3, Bull. Am. Phys. Soc. , 229 (2011).
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10.1063/1.3695021
/content/aip/journal/pop/19/5/10.1063/1.3695021
http://aip.metastore.ingenta.com/content/aip/journal/pop/19/5/10.1063/1.3695021
View: Figures

Figures

Image of FIG. 1.
FIG. 1.

Schematic of nuclear resonance fluorescence. An incident gamma-ray excites a nucleus from the ground state (angular momentum ) to the excited state (angular momentum ). is the partial width for the direct gamma-ray transition to the ground state. The nucleus relaxes back to the ground state by emitting a photon of characteristic energy.

Image of FIG. 2.
FIG. 2.

General architecture of the Compton scattering source being built at LLNL. It will include an X-band linac powered bymodulators and klystrons and two laser systems. The PDL produces the electrons on the photocathode and the ILS collides with the electron beam at the interaction point to yield gamma-rays.

Image of FIG. 3.
FIG. 3.

Nominal electron beam parameters (top) and corresponding gamma-ray spectrum. The electron beam has a normalized emittance of 0.34 mm mrad at 163 MeV, a 0.16% energy spread and a 7.24 m focus. The laser has a 1064 nm wavelength, a 0.15 J energy and a 10 m (FWHM) focus.

Image of FIG. 4.
FIG. 4.

Comparison of gamma-ray spectra obtained for electron beams with two different normalized emittances. The laser parameters are identical to Figure 3 for both cases. For (2) the electron beam parameters are identical to Figure 3 except for the emittance mm mrad and the focal spot 9.5 m.

Image of FIG. 5.
FIG. 5.

Comparison of gamma-ray spectra obtained for electron beams with two different energy spreads. The laser parameters are identical to Figure 3 for both cases. For (2) the electron beam parameters are identical to Figure 3 except for the energy spread .

Image of FIG. 6.
FIG. 6.

Comparison of gamma-ray spectra for different laser energies. For all three cases, the electron beam parameters are mm mrad, and the focal spot is 28.9 m. The laser focal spot and duration are 18.6 m and 10 ps for each case and the laser energies are 0.15 J, 0.3 J, and 1 J (blue, green, and red) which correspond, respectively, to 0.06, 0.09, and 0.16.

Image of FIG. 7.
FIG. 7.

Comparison of gamma-ray spectra for different focusing geometries. For (1) all parameters are identical to Figure 3 . For (2) all parameters are identical to Figure 3 except m and  = 14.5 m. For (3) all parameters are identical to Figure 3 except m and  = 28.9 m.

Image of FIG. 8.
FIG. 8.

Comparison of the experimental data from our previous results 4 and the expected gamma-ray spectrum of our next source (electron beam and laser parameters identical to Figure 3 .)

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2012-03-30
2014-04-16
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Precision linac and laser technologies for nuclear photonics gamma-ray sourcesa)
http://aip.metastore.ingenta.com/content/aip/journal/pop/19/5/10.1063/1.3695021
10.1063/1.3695021
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