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Abstract
The development of models and the ``Virtual Detector for Synchrotron Radiation'' (vdsr) code that accurately describe the production of synchrotron radiation are described. These models and code are valid in the classical and linear (single-scattering) quantum regimes and are capable of describing radiation produced from laser-plasma accelerators (LPAs) through a variety of mechanisms including betatron radiation, undulator radiation, and Thomson/Compton scattering. Previous models of classical synchrotron radiation, such as those typically used for undulator radiation, are inadequate in describing the radiation spectra from electrons undergoing small numbers of oscillations. This is due to an improper treatment of a mathematical evaluation at the end points of an integration that leads to an unphysical plateau in the radiation spectrum at high frequencies, the magnitude of which increases as the number of oscillation periods decreases. This is important for betatron radiation from LPAs, in which the betatron strength parameter is large but the number of betatron periods is small. The code vdsr allows the radiation to be calculated in this regime by full integration over each electron trajectory, including end-point effects, and this code is used to calculate betatron radiation for cases of experimental interest. Radiation from Thomson scattering and Compton scattering is also studied with vdsr. For Thomson scattering, radiation reaction is included by using the Sokolov method for the calculation of the electron dynamics. For Compton scattering, quantum recoil effects are considered in vdsr by using Monte Carlo methods. The quantum calculation has been benchmarked with the classical calculation in a classical regime.
Highlights
In recent years, laser plasma based electron accelerators (LPAs) have achieved significant progress due to controlled injection and guiding technologies [1,2,3,4]
We describe the development of models and the code ’’Virtual Detector for Synchrotron Radiation’’ (VDSR) to accurately calculate the synchrotron radiation from laser-plasma accelerators (LPAs) for a variety of physical processes, including undulator radiation, betatron radiation, and Thomson/ Compton scattering
We have presented the development of models and the code VDSR that accurately describe synchrotron radiation produced by a variety of methods, including betatron radiation, undulator radiation, and Thomson/Compton scattering
Summary
Laser plasma based electron accelerators (LPAs) have achieved significant progress due to controlled injection and guiding technologies [1,2,3,4]. Several groups have already carried out these experiments and nm level wavelength radiation was demonstrated [24,25] Another short laser pulse (or, alternatively, a reflected pulse by a plasma mirror) can be used to produce high energy photons by scattering with the LPA electron beams [26,27,28]. We describe the development of models and the code ’’Virtual Detector for Synchrotron Radiation’’ (VDSR) to accurately calculate the synchrotron radiation from LPAs for a variety of physical processes, including undulator radiation, betatron radiation, and Thomson/ Compton scattering. The first presents the conventional analytical formulation of synchrotron radiation in the classical regime and the second presents details on the VDSR code
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