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We developed a facile route for separating and detecting phenethylamine from plasma using photonic crystal biosilica, which serves as a new lab-on-chip platform combining surface-enhanced Raman scattering sensing and thin layer chromatography.
Coherent terahertz radiation obtained from double bunched sheet electron beams over a surface evanescent wave provides an effective method to extend the operating frequency and power capacity. An overmoded ridge-loaded grating waveguide was introduced in our double sheet beam backward wave oscillator (BWO) design. The fundamental mode TM11 was updated to the TM21++ mode, which is compact to integrate...
Folded-type waveguide is a kind of significant slow wave structure (SWS) for developing high power millimeter wave and terahertz wave source. This paper reports the study on the folded type waveguide and its applications in millimeter wave and THz source in Vacuum Electronics National Laboratory(VENL) in China, in which the analysis and simulation of the RF properties and the electron beam-wave interaction...
We identify three regimes of correlated GeV-electron/keV-betatron-x-ray generation by a laser-plasma accelerator driven by the Texas Petawatt laser, and relate them to variations in strength of blowout, injection geometry and beam loading.
Progress in micro- to millimeter-wave technologies have made possible advanced diagnostics (imaging) for various applications, such as, plasma diagnostics, radio astronomy, alien substance detection, airborne and spaceborne imaging radars called as synthetic aperture radars, living body measurements. In this report we focus on the reflectometric (radar) techniques applied to plasma diagnostics and...
We report self-injected quasi-monoenergetic (5% spread FWHM) acceleration of electrons to 2.0 ± 0.1 GeV by 0.6 PW-laser-driven wakefield acceleration in pure He plasma of density 5×1017 cm−3. Electron bunches diverge ∼0.5mrad, and contain ∼60 pC.
We determine cluster mass fraction fc in supersonic gas jets by measuring femtosecond evolution of the jet's refractive index by single-shot frequency domain holography. Variations of fc with time, position and backing pressure are measured.
We demonstrated single-shot frequency-domain tomographic imaging of laser-produced refractive index structures that evolve during propagation, using multiple probe pulses multiplexed to a single spectrometer and tomographic reconstruction algorithms.
Metal-insulator-semiconductors structures (MIS) with a layer of silicon nanocrystals embedded within two SiO2 layers are fabricated by using plasma enhanced chemical vapor deposition. By using current-voltage (I-V) measurements with different sweep rates, we study the mechanism of electrons and holes charging/discharging characteristic of the MIS structures. Distinct current peaks duo to electrons...
We report the extension of Frequency-Domain Holography to a Frequency-Domain Streak Camera capable of capturing the evolution of refractive index structures propagating at luminal speeds. Possibility of extension to Frequency-Domain Tomography is demonstrated.
EAST plasma facing components (PFCs) have the function of protecting the vacuum vessel, heating systems and diagnostic components from the plasma particles and heat loads, and also additional to this particles and heat loads handling. They are installed in the vacuum vessel together with in-vessel coils, cryopump and diagnostic components. The design, fabrication and assembly have been finished. The...
A pulsed power generator (PPG-I) with a current of 400 kA in amplitude and 100 ns in pulse width was constructed. The development of X-pinches and the early stages of wire-array Z-pinches were investigated by X-ray backlighting using the X-pinch driven by PPG-I as X-ray source. The plasma explosion and implosion near the cross point of the X-shape wires can be clearly seen from a series of the backlighting...
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