Self-modulated laser wakefield accelerators as x-ray sources

Lemos, N.; Martins, J. L.; Tsung, F. S.; Shaw, J. L.; Marsh, K. A.; Albert, F.; Pollock, B. B.; Joshi, C.

doi:10.1088/0741-3335/58/3/034018

Title: Self-modulated laser wakefield accelerators as x-ray sources

Journal Article · Wed Feb 17 00:00:00 EST 2016 · Plasma Physics and Controlled Fusion

DOI:https://doi.org/10.1088/0741-3335/58/3/034018· OSTI ID:1332478

Lemos, N. ^[1]; Martins, J. L. ^[2]; Tsung, F. S. ^[1]; Shaw, J. L. ^[1]; Marsh, K. A. ^[1]; Albert, F. ^[3]; Pollock, B. B. ^[3]; Joshi, C. ^[1]

Univ. of California, Los Angeles, CA (United States)
Univ. de Lisboa (UT), Lisbon (Portugal)
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)

The development of a directional, small-divergence, and short-duration picosecond x-ray probe beam with an energy greater than 50 keV is desirable for high energy density science experiments. We therefore explore through particle-in-cell (PIC) computer simulations the possibility of using x-rays radiated by betatron-like motion of electrons from a self-modulated laser wakefield accelerator as a possible candidate to meet this need. Two OSIRIS 2D PIC simulations with mobile ions are presented, one with a normalized vector potential a0 = 1.5 and the other with an a0 = 3. We find that in both cases direct laser acceleration (DLA) is an important additional acceleration mechanism in addition to the longitudinal electric field of the plasma wave. Together these mechanisms produce electrons with a continuous energy spectrum with a maximum energy of 300 MeV for a0 = 3 case and 180 MeV in the a0 = 1.5 case. Forward-directed x-ray radiation with a photon energy up to 100 keV was calculated for the a0 = 3 case and up to 12 keV for the a0 = 1.5 case. The x-ray spectrum can be fitted with a sum of two synchrotron spectra with critical photon energies of 13 and 45 keV for the a0 of 3 and critical photon energies of 0.3 and 1.4 keV for a0 of 1.5 in the plane of polarization of the laser. The full width at half maximum divergence angle of the x-rays was 62 × 1.9 mrad for a0 =3and77×3.8mradfora0 =1.5.

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Research Organization:: Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States); Univ. of California, Los Angeles, CA (United States)

Sponsoring Organization:: USDOE National Nuclear Security Administration (NNSA)

Grant/Contract Number:: AC52-07NA27344; NA0002950

OSTI ID:: 1332478

Alternate ID(s):: OSTI ID: 1258645

Report Number(s):: LLNL-JRNL-697677

Journal Information:: Plasma Physics and Controlled Fusion, Vol. 58, Issue 3; ISSN 0741-3335

Publisher:: IOP ScienceCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 33 works

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Figure 4: Part 2(p. 10)

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42 ENGINEERING
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