Abstract At the Paul Scherrer Institute (PSI), superconducting cyclotron “COMET” delivers a 250 MeV proton beam for radiation therapy in pulses of 1ns at cyclotron-RF frequency 72.85 MHz. Accurate measurement position currents 0.1–10 nA transport line downstream degrader is crucial importance treatment safety and quality, alignment feedback systems. This essential efficient operation delivery. ...

Using five spacecraft in geosynchronous orbit, plasmaspheric drainage plumes are located in the dayside magnetosphere and the measured pitch angle anisotropies of radiation belt electrons are compared duskward and dawnward of the plumes. Two hundred twenty-six plume crossings are analyzed. It is found that the radiation belt anisotropy is systematically greater dawnward of plumes (before the el...

Abstract The lowest possible energy of proton scanning beam in cyclotron therapy facilities is typically between 60 and 100 MeV. Treatment superficial lesions requires a pre-absorber to deliver doses shallower volumes. In most the cases range shifter (RS) used, but as an alternative solution, patient-specific 3D printed compensator (BC) can be applied. A BC enables further reduction air gap con...

Two-dimensional solutions of compressional Alfven eigenmodes (CAE) are studied in the cold plasma approximation. For finite inverse aspect ratio tokamak plasmas the two-dimensional eigenmode envelope is localized at the low magnetic field side with the radial and poloidal localization on the order of u / f i and u/*, respectively, where rn is the dominant poloidal mode number. Charged fusion pr...

We present a simple and constructive method to find $N$-soliton solutions of the equation suggested by Davydova Lashkin describe dynamics nonlinear ion-cyclotron waves in plasma subsequently known (in more general form as applied optics) Fokas-Lenells equation. Using classical inverse scattering transform approach, we bright solutions, rational mixture exponential functions. Explicit breather a...

The possibility to control both spectral and polarization properties of seed THz pulses in strongly nonequilibrium elongated magnetized plasma channels formed via intense UV femtosecond laser nitrogen (air) is analyzed. physical mechanism pulse based on cyclotron resonance, which can reconstruct electrodynamical features and, particular, its ability amplify the radiation different bands states....

Abstract— A quadrupole antenna has been designed and produced at the L-2M stellarator for experiments on ion cyclotron plasma heating current drive. Using a power meter of incident reflected waves, first measurements radiation resistance have performed in ohmic regime. The measured as function mean density. It is shown that fraction absorbed ensured by coaxial modes 25%. created can also be use...