Portable optical wireless (POW) system is a rapidly deployable, light – weight and battery operated application of the outdoor optical wireless communication. In this study, wavelength diversity technique is examined to analyse the system performance, considering the short term and short distance fixed-to-fixed (f2f) POW system, in case of pointing error occurrence. The average bit error rate (...

A FT spectrometer is an interferometer. Its historical and most widely known configuration is the Michelson interferometer, shown on Fig. 1. A beam-splitter is used for dividing the light to be spectrally analyzed into two beams. After they have been reflected on two distinct mirrors, the two beams are recombined by the same beam-splitter and sent to a detector. One of the mirrors is fixed, whi...

The purpose of this study is to describe the comprehensive commissioning process and initial clinical performance of the Vero linear accelerator, a new radiotherapy device recently installed at UT Southwestern Medical Center specifically developed for delivery of image-guided stereotactic ablative radiotherapy (SABR). The Vero system utilizes a ring gantry to integrate a beam delivery platform ...

The ion specie fractions of the diagnostic hydrogen beam of TEXTOR tokamak have been determined by making use of a Ha -light Doppler shift spectroscopy and alternatively by a magnetic mass spectrometer. The measurements were done for the fixed beam energy of 50 keV and beam current variable up to 2.5 A. According to the measurements, the full energy beam component is for a radio frequency plasm...

We present a new approach to designing V-band Bull’s eye antenna so as to produce multiple beams, which are either fixed or discretely steerable. Bull’s eye antennas comprise concentric rings around a subwavelength aperture. Beam deflection is accomplished by adjusting the effective spacing of the rings, which we explain in terms of the coupling angle to free space and surface waves. We show th...

It is well known that directional antennas and circular polarization (CP) antennas are effective in reducing degradations of receiving power caused by multipath propagation effects [1]. Therefore, simultaneous controlling these two features—directivity and polarization—is expected to considerably reduce such adverse effects. Some papers have reported CP antennas with beam steering means [2], [3...

Fourth-generation (4G) wireless networks promise the provision of unprecedented data rates. However apart from achieving a very high headline rate, it is also critical that future systems provide the capacity density of at least 1 Gbit/s/km that is expected to be in demand. A promising solution that can provide the needed capacity density uses a large number of narrow beams at the base station ...

The injection and beam dumping systems of the LHC will need to be upgraded to comply with the requirements of operation with the HL-LHC beams. The elements of the injection system concerned are the fixed and movable absorbers which protect the LHC in case of an injection kicker error and the injection kickers themselves. The beam dumping system elements under study are the absorbers which prote...

Volumetric-modulated arc therapy (VMAT) is emerging as a leading technology in treating early-stage, non-small cell lung cancer (NSCLC) with stereotactic ablative radiotherapy (SABR). However, two other modalities capable of deliver-ing intensity-modulated radiation therapy (IMRT) include fixed-beam and helical TomoTherapy (HT). This study aims to provide an extensive dosimetric compari-son amo...

A wideband vertically-polarized end-fire magneto-electric (ME) dipole antenna fed by an asymmetrical substrate integrated coaxial line (ASICL) is proposed for millimeter-wave (mm-wave) applications. The ME has impedance bandwidth of 60% and produces radiation with a stable gain between 5.8 6.9 dBi in simulation. To verify the design concept its application arrays, 1 × 8 linear array fixed beam ...