In:
EPJ Web of Conferences, EDP Sciences, Vol. 203 ( 2019), p. 03006-
Abstract:
An electron cyclotron emission (ECE) diagnostic of suprathermal electrons was utilised for runaway electron (RE) experiments purposes in the COMPASS tokamak. Our vertical ECE (V-ECE) system consists of a 16-channel heterodyne radiometer and an E-band horn antenna with a 76.5-88 GHz frequency range front-end. Simulations used for the design of the diagnostic showed a possibility of detecting the emission of low-energy (50-140 keV) runaway electrons. We realized measurements with both extraordinary (X-) and ordinary (O-) mode linear polarizations. The amplitudes of the X-mode and O-mode signals are similar, which can be explained by depolarised reflected radiation. V-ECE measurements in low-density flattop discharges and in discharges with massive gas injections of high- Z elements show correlations with other RE diagnostics. Our results are in the agreement with the principles of the primary runaway generation mechanisms.
Type of Medium:
Online Resource
ISSN:
2100-014X
DOI:
10.1051/epjconf/201920303006
Language:
English
Publisher:
EDP Sciences
Publication Date:
2019
detail.hit.zdb_id:
2595425-8