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The radio nebula W50 is a unique object interacting with the jets of themicroquasar SS433. The SS433/W50 system is a good target for investigating theenergy of cosmic-ray particles accelerated by galactic jets. We reportobservations of radio nebula W50 conducted with the NSF's Karl G. Jansky VeryLarge Array (VLA) in the L band (1.0 -- 2.0 GHz). We investigate the secularchange of W50 on the basis of the observations in 1984, 1996, and 2017, andfind that most of its structures were stable for 33 years. We revise the upperlimit velocity of the eastern terminal filament by half to 0.023$c$ assuming adistance of 5.5 kpc. We also analyze the observational data of the AreciboObservatory 305-m telescope and identify the HI cavity around W50 in thevelocity range 33.77 km s$^{-1}$ -- 55.85 km s$^{-1}$. From this result, weestimate the maximum energy of the cosmic-ray protons accelerated by the jetterminal region to be above 10$^{15.5}$ eV. We also use the luminosity of thegamma-rays in the range 0.5 -- 10 GeV to estimate the total energy ofaccelerated protons below 5.2 $\times$ 10$^{48}$ erg.

Energy estimation of high energy particles associated with the SS433/W50 system through radio observation at 1.4 GHz