Observation of infrared synchrotron radiation from tokamak runaway electrons in textor

摘要: During runaway discharges in TEXTOR, intense infrared (IR) radiation is-emitted the electron flow direction. This can only be explained by synchrotron of fast electrons. The observed spectral dependence is consistent with electrons 25-30 MeV energy; intensity corresponds to about 1016 or an electrical current 40 kA. From spatial structure IR pattern, new insight into distribution and their perpendicular momentum gained. populate a torus diameter 0.5-0.6 m, which slightly larger than plasma radius; determined from vertical extent pattern amounts 5 m0c. transformation rate runaways estimated time delay signal as 2 × 10−4 s−1; this agrees theoretical expectations derived ratio field strength critical strength. In are confined up energies 50 MeV, just below limit where phase should exist radiate much energy they gain per turn.