Creating extended, highly homogeneous plasma columns like that required by wakefield accelerators can be a challenge. We study the propagation of ultra-short, TW power ionizing laser pulses in 10-meter-long rubidium vapor and they create. perform experiments numerical simulations for with 780 nm central wavelength, which is resonant D$_2$ transition from ground state atoms, as well 810 some dis...

This paper focuses on utilizing several different optical diagnostics to experimentally characterize a pure helium atmospheric pressure plasma jet. Axial electric field measurements were carried out along the plume through use of non-perturbing method based polarization-dependent Stark spectroscopy $492.2$ nm line. The is shown increase with distance length, reaching values as high $24.5$ kV cm...

The increased use of medical ultrasound above 40 MHz poses the challenge of measuring beam features that may be less than 40 microm. We have successfully used the optical Schlieren technique for transducers operating as high as 110 MHz. After a brief discussion of the technique, results are presented, including comparisons to state-of-the-art hydrophones and wire targets.

An experimental study on controlling hypersonic boundary layer transition using a surface arc plasma actuation array was conducted. First, base characteristics were analyzed in virtue of various sensors and high-speed schlieren, the criterion established based critical value schlieren spatial power spectral density resolution. Then, influence three different frequencies (8, 34, 55 kHz) studied ...

In this paper, the behavior of shock wave discharged from the pipe end is studied. The shock wave is generated using the shock tube (MO-tube). The flow field while the shock moves downstream is visualized using shadow photography and schlieren photography. The propagation of shock wave and the phenomenon of the occurrence of second vortex ring are examined and discussed.