In situ calibration of neutron detectors on TEXTOR
Neutron yield measurements were performed at the Jülich tokamak experiment TEXTOR with different detectors located around the tokamak and on the centre axis above the shielding roof. Due to the large structure of the machine and the extended diagnostic equipment, both virgin and scattered neutrons were detected. To prepare a Bonner sphere of appropriate response, the shape of the degraded neutron spectrum was determined with a spherical ionisation chamber in situ. These investigations have been enlarged under quasi-real conditions at the accelerator facility of the Physikalisch-Technische Bundesanstalt in Braunschweig with a set of Bonner spheres used as a spectrometer. For the calibration, the plasma neutron source is simulated by two point sources, 238Pu/B and 252Cf. The sources are moved around the TEXTOR vessel along the position of the magnetic axis. This article includes details of the measurements and final arrangement of the neutron spectra, together with the experimental setup for their calibration, documentation of the results obtained and a description of some applications.
Bibliographic Reference: Article: Review of Scientific Instruments, Vol. 63, (1992) pp. 1945-1952
Record Number: 199210856 / Last updated on: 1994-12-02
Original language: en
Available languages: en