Abstract
Photoneutron production during disruptions was monitored on the FTU machine by a set of calibrated BF 3 proportional counters. Both hydrogen and deuterium discharges covering a wide density range were examined. The functional dependence of the photoneutron production on n e, Z eff and I p is in agreement with the Dreicer generation, being the main source of runaway electrons during disruptions in FTU. No detectable photoneutron production was observed at a plasma density higher than 1.4 × 10 20 m −3, corresponding to Z eff values close to 1. The typical runaway energy was evaluated from the curve of the photoneutron yield per electron vs. energy for disruptions characterized by a hesitation in the plasma current decay. Damage by disruption generated runaways was found to be concentrated around the inboard equatorial plane as suggested by temperature and activation measurements.
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