MOOCB2
CIPS, Boulder, Colorado, USA
UCLA, Los Angeles, USA
RadiaBeam, Santa Monica, USA
Tech-X, Boulder, Colorado, USA
Uni HH, Hamburg, Germany
The underdense plasma photocathode concept (aka Trojan horse) *,** is a promising approach to achieving fs-scale electron bunches with pC-scale charge and transverse normalized emittance below 0.01 mm-mrad, yielding peak currents of order 100 A and beam brightness as high as 1019 A/(m rad)2, for a wide range of achievable beam energies up to 10 GeV. A proof-of-principle experiment will be conducted at the FACET user facility in early 2014. We present 2D and 3D simulations with physical parameters relevant to the planned experiment.
* Hidding et al., PRL 108:035001 (2012).
** Xi et al., PRST-AB 16:031303 (2013).
RadiaBeam, Santa Monica, USA
CIPS, Boulder, Colorado, USA
BNL, Upton, Long Island, New York, USA
Many advanced accelerator concepts require the co-propagation and interaction of the electron with a laser (e.g., laser-plasma accelerators, inverse Compton scattering, laser heaters, and electron beam diagnostics with laser light). The strict requirements on beam properties necessitate numerical modeling to fully understand the complexities of the beam dynamics. Laser-specific simulations often require a different set of modeling tools. This has resulted in a hodgepodge approach, where the output of one program must be inputted into another. This paper presents the Radtrack software highlights, which aims to simplify these issues by uniting key software components under an intuitive graphical interface while addressing key problems relevant in the accelerator community.
RadiaBeam, Santa Monica, USA
BNL, Upton, Long Island, New York, USA
The removal of residual chirp in XFELs is of paramount importance for efficient lasing. Although current S-band XFELs remove the unwanted residual chirp using off-crest acceleration after the final bunch compressor, this technique is not possible for XFELs with soft X-ray lines as there are no further accelerating structures. The off-crest dechirping technique is also expensive for future superconducting XFELs. In response, RadiaBeam Systems presents its work, building upon the theoretical work of Bane and Stupakov*, in RF-free residual chirp mitigation using only passive techniques. Beam-induced longitudinal wakefields are produced with opposing corrugated plates which allow for an entirely RF-free chirp removal. Theory, engineering, and experimental results are presented.
* K.L.F. Bane, G. Stupakov, Nucl. Inst. Meth. 690 (2012) 106-110
RadiaBeam, Santa Monica, USA
BNL, Upton, Long Island, New York, USA
UCLA, Los Angeles, California, USA
The fiber-mesh diagnostic (FMD) is a transverse beam profile diagnostic based on the emission and detection of Cherenkov radiation produced as a relativistic electron beam traverses through an ordered bundle of fiber optics (SiO2), arranged in a hexagonal close-pack configuration. Sub-10μm transverse beam profile resolution is attainable due to fiber optic core concentricity. Adequate SNR is achieved using a standard CCD sensor. A fiber optic taper input maximizes light collection efficiency by coupling each output channel to approximately single-pixel pitch. A v-groove holder and assembly process was developed to hold many fiber layers in the desired configuration. In this paper, we present results from a fully functional FMD prototype evaluated at the BNL ATF facility that demonstrates the efficacy of this diagnostic.
UCLA, Los Angeles, USA
RadiaBeam, Marina del Rey, USA
* Li et al., PRL 2013.
UCLA, Los Angeles, USA
RadiaBeam, Marina del Rey, USA
* Li et al., PRL 2013.